Conversions

// JavaScript functions for robvanderwoude.com

```
// (c) 2010 Rob van der Woude
```
```
// https://www.robvanderwoude.com
```
```
 
```
```
function changedAcre( ) {
```

	var areaAcre = parseFloat( document.AreaConversion1.Acre.value );

```
	var areaSqM = areaAcre * 4046.8564224;
```
```
	var areaAre = areaSqM / 100;
```
```
	var areaSqKm = areaSqM / 1000000;
```
```
	var areaHectare = areaSqM / 10000;
```
```
	var areaSqYd = areaSqM / 0.83612736;
```
```
	var areaSqFt = areaSqYd * 9;
```
```
	var areaSqIn = areaSqFt * 144;
```

	var areaSqMi = areaSqM / 2589988.110336;

	document.AreaConversion1.Acre.value = areaAcre.toFixed(4)

	document.AreaConversion1.Are.value = areaAre.toFixed(4)

	document.AreaConversion1.Hectare.value = areaHectare.toFixed(5)

	document.AreaConversion1.SqFt.value = areaSqFt.toFixed(2)

	document.AreaConversion1.SqIn.value = areaSqIn.toFixed(1)

	document.AreaConversion2.SqKm.value = areaSqKm.toFixed(6)

	document.AreaConversion2.SqM.value = areaSqM.toFixed(2)

	document.AreaConversion2.SqMi.value = areaSqMi.toFixed(6)

	document.AreaConversion2.SqYd.value = areaSqYd.toFixed(2)

```
	return true;
```
```
}
```
```
 
```
```
function changedAre( ) {
```

	var areaAre = parseFloat( document.AreaConversion1.Are.value );

```
	var areaSqM = areaAre * 100;
```
```
	var areaSqKm = areaSqM / 1000000;
```
```
	var areaHectare = areaSqM / 10000;
```
```
	var areaAcre = areaSqM / 4046.8564224;
```
```
	var areaSqYd = areaSqM / 0.83612736;
```
```
	var areaSqFt = areaSqYd * 9;
```
```
	var areaSqIn = areaSqFt * 144;
```

	var areaSqMi = areaSqM / 2589988.110336;

	document.AreaConversion1.Acre.value = areaAcre.toFixed(4)

	document.AreaConversion1.Are.value = areaAre.toFixed(4)

	document.AreaConversion1.Hectare.value = areaHectare.toFixed(5)

	document.AreaConversion1.SqFt.value = areaSqFt.toFixed(2)

	document.AreaConversion1.SqIn.value = areaSqIn.toFixed(1)

	document.AreaConversion2.SqKm.value = areaSqKm.toFixed(6)

	document.AreaConversion2.SqM.value = areaSqM.toFixed(2)

	document.AreaConversion2.SqMi.value = areaSqMi.toFixed(6)

	document.AreaConversion2.SqYd.value = areaSqYd.toFixed(2)

```
	return true;
```
```
}
```
```
 
```
```
function changedAtmosphere( ) {
```

	var pressureAtm = parseFloat( document.PressureConversion.Atmosphere.value );

	var pressureBar = pressureAtm * 1.01325;

	var pressurePa  = pressureBar * 100000;

	var pressurePsi = pressureBar * 14.5037744;

	document.PressureConversion.Atmosphere.value = pressureAtm.toFixed(3);

	document.PressureConversion.Bar.value = pressureBar.toFixed(3);

	document.PressureConversion.Pascal.value = pressurePa.toFixed(0);

	document.PressureConversion.Psi.value = pressurePsi.toFixed(3);

```
	return true;
```
```
}
```
```
 
```
```
function changedBar( ) {
```

	var pressureBar = parseFloat( document.PressureConversion.Bar.value );

	var pressureAtm = pressureBar / 1.01325;

	var pressurePa  = pressureBar * 100000;

	var pressurePsi = pressureBar * 14.5037744;

	document.PressureConversion.Atmosphere.value = pressureAtm.toFixed(3);

	document.PressureConversion.Bar.value = pressureBar.toFixed(3);

	document.PressureConversion.Pascal.value = pressurePa.toFixed(0);

	document.PressureConversion.Psi.value = pressurePsi.toFixed(3);

```
	return true;
```
```
}
```
```
 
```
```
function changedBarrel( ) {
```

	var numBarrel = parseFloat( document.VolumeConversion.Barrel.value );

```
	var numGallon = numBarrel * 42;
```
```
	var numPint = numGallon * 8;
```
```
	var numFlOz = numGallon * 128;
```
```
	var numLitre = numPint * 0.473176473;
```

    document.VolumeConversion.Barrel.value = numBarrel.toFixed(3);

    document.VolumeConversion.FlOz.value = numFlOz.toFixed(1);

    document.VolumeConversion.Gallon.value = numGallon.toFixed(3);

    document.VolumeConversion.Litre.value = numLitre.toFixed(3);

    document.VolumeConversion.Pint.value = numPint.toFixed(2);

```
	return true;
```
```
}
```
```
 
```
```
function changedCelsius() {
```

	var tempC = Number( document.TemperatureConversion.Celsius.value );

```
	var tempK = tempC + 273.15;
```
```
	var tempF = tempK * 1.8 - 459.67;
```

	document.TemperatureConversion.Celsius.value = tempC.toFixed(2);

	document.TemperatureConversion.Fahrenheit.value = tempF.toFixed(2);

	document.TemperatureConversion.Kelvin.value = tempK.toFixed(2);

```
	return true;
```
```
}
```
```
 
```
```
function changedDecimal( ) {
```

	var numI = parseInt( document.RomanNumerals.Decimal.value );

```
	if ( numI < 1 || numI > 4999 ) {
```

		alert( 'Integer must be in the range of 1..4999' );

```
		return false;
```
```
	} else{
```
```
		numR = Decimal2Roman( numI );
```

		document.RomanNumerals.Roman.value = numR;

```
		return true;
```
```
	}
```
```
}
```
```
 
```
```
function changedFahrenheit() {
```

	var tempF = Number( document.TemperatureConversion.Fahrenheit.value );

```
	var tempK = ( tempF + 459.67 ) / 1.8;
```
```
	var tempC = tempK - 273.15;
```

	document.TemperatureConversion.Celsius.value = tempC.toFixed(2);

	document.TemperatureConversion.Fahrenheit.value = tempF.toFixed(2);

	document.TemperatureConversion.Kelvin.value = tempK.toFixed(2);

```
	return true;
```
```
}
```
```
 
```
```
function changedFeet( ) {
```

	var strFeetInch = document.LengthConversion.Feet.value;

```
	var pattern1 = /\d+(\.\d+)?[\'\"]$/;
```

	var errmsg = "Feet/inches value must be in feet'inches\" or feet' or inches\" format";

	if ( strFeetInch.search( pattern1 ) == -1 ) {

```
		alert( errmsg );
```
```
		return false;
```
```
	}
```

	var pattern2 = /^(((\d+)\')?)(((\d+(\.\d+)?)\")?)$/;

	if ( strFeetInch.search( pattern2 ) == -1 ) {

```
		alert( errmsg );
```
```
		return false;
```
```
	}
```

	var posFt = strFeetInch.indexOf( "'" );

	var posIn = strFeetInch.indexOf( '"' );

	if ( posFt > -1 && posIn > -1 && posIn < posFt ) {

```
		alert( errmsg );
```
```
		return false;
```
```
	}
```
```
	if ( posFt > -1 && posIn > -1 ) {
```

		var numFeet = parseInt( strFeetInch.substring( 0, posFt ) );

		var numInch = parseFloat( strFeetInch.substring( posFt + 1, posIn ) );

	} else if ( posFt == -1 && posIn == -1 ) {

```
		var numFeet = 0;
```
```
		var numInch = 0;
```
```
	} else if ( posFt > -1 ) {
```

		var numFeet = parseInt( strFeetInch.substring( 0, posFt ) );

```
		var numInch = 0;
```
```
	} else {
```
```
		var numFeet = 0;
```

		var numInch = parseFloat( strFeetInch.substring( 0, posIn ) );

```
	}
```
```
	if ( numInch > 11 ) {
```

		numFeet = numFeet + parseInt( numInch / 12 );

```
		numInch = numInch % 12;
```
```
	}
```
```
	if ( numInch == 0 && numFeet == 0 ) {
```
```
		strFeetInch = "0";
```
```
	} else if ( numInch == 0 ) {
```
```
		strFeetInch = numFeet + "'";
```
```
	} else if ( numFeet == 0 ) {
```

		strFeetInch = numInch.toFixed(1) + '"';

```
	} else {
```

		strFeetInch = numFeet + "'" + numInch.toFixed(1) + '"';

```
	}
```
```
	numInch = numInch + ( 12 * numFeet );
```
```
	var numMeters = numInch * 0.0254;
```

	document.LengthConversion.Feet.value = strFeetInch;

	document.LengthConversion.Meters.value = numMeters.toFixed(2);

```
	return true;
```
```
}
```
```
 
```
```
function changedFlOz( ) {
```

	var numFlOz = parseFloat( document.VolumeConversion.FlOz.value );

```
	var numGallon = numFlOz / 128;
```
```
	var numBarrel = numGallon / 42;
```
```
	var numPint = numGallon * 8;
```
```
	var numLitre = numPint * 0.473176473;
```

    document.VolumeConversion.Barrel.value = numBarrel.toFixed(3);

    document.VolumeConversion.FlOz.value = numFlOz.toFixed(1);

    document.VolumeConversion.Gallon.value = numGallon.toFixed(3);

    document.VolumeConversion.Litre.value = numLitre.toFixed(3);

    document.VolumeConversion.Pint.value = numPint.toFixed(2);

```
	return true;
```
```
}
```
```
 
```
```
function changedGallon( ) {
```

	var numGallon = parseFloat( document.VolumeConversion.Gallon.value );

```
	var numBarrel = numGallon / 42;
```
```
	var numPint = numGallon * 8;
```
```
	var numFlOz = numGallon * 128;
```
```
	var numLitre = numPint * 0.473176473;
```

    document.VolumeConversion.Barrel.value = numBarrel.toFixed(3);

    document.VolumeConversion.FlOz.value = numFlOz.toFixed(1);

    document.VolumeConversion.Gallon.value = numGallon.toFixed(3);

    document.VolumeConversion.Litre.value = numLitre.toFixed(3);

    document.VolumeConversion.Pint.value = numPint.toFixed(2);

```
	return true;
```
```
}
```
```
 
```
```
function changedGrain( ) {
```

	var wtGrain = parseInt( document.WeightConversion.Grain.value );

```
	var wtPound = wtGrain / 7000;
```
```
	var wtKg = wtPound * 0.45359237;
```

	var wtStone = parseInt( wtPound / 14 );

	var intPound = parseInt( wtPound + 0.5 - ( 14 * wtStone ) );

```
	if ( intPound == 0 ) {
```

		var strStone = wtStone.toString( ) + " stone";

```
	} else {
```

		var strStone = wtStone.toString( ) + " stone " + intPound.toString( );

```
	}
```

	document.WeightConversion.Stone.value = strStone;

	document.WeightConversion.Grain.value = wtGrain;

	document.WeightConversion.Pound.value = WritePound( wtPound );

	document.WeightConversion.Kg.value = wtKg.toFixed(3);

```
	return true;
```
```
}
```
```
 
```
```
function changedHectare( ) {
```

	var areaHectare = parseFloat( document.AreaConversion1.Hectare.value );

```
	var areaSqM = areaHectare * 10000;
```
```
	var areaSqKm = areaSqM / 1000000;
```
```
	var areaAre = areaSqM / 100;
```
```
	var areaAcre = areaSqM / 4046.8564224;
```
```
	var areaSqYd = areaSqM / 0.83612736;
```
```
	var areaSqFt = areaSqYd * 9;
```
```
	var areaSqIn = areaSqFt * 144;
```

	var areaSqMi = areaSqM / 2589988.110336;

	document.AreaConversion1.Acre.value = areaAcre.toFixed(4)

	document.AreaConversion1.Are.value = areaAre.toFixed(4)

	document.AreaConversion1.Hectare.value = areaHectare.toFixed(5)

	document.AreaConversion1.SqFt.value = areaSqFt.toFixed(2)

	document.AreaConversion1.SqIn.value = areaSqIn.toFixed(1)

	document.AreaConversion2.SqKm.value = areaSqKm.toFixed(6)

	document.AreaConversion2.SqM.value = areaSqM.toFixed(2)

	document.AreaConversion2.SqMi.value = areaSqMi.toFixed(6)

	document.AreaConversion2.SqYd.value = areaSqYd.toFixed(2)

```
	return true;
```
```
}
```
```
 
```
```
function changedHPImpE( ) {
```

    var pwrHPImpE = parseFloat( document.PowerConversion.HPImpE.value );

```
    var pwrWatt = pwrHPImpE * 746;
```

    var pwrHPImpM = pwrWatt / 745.69987158227022;

    var pwrHPMetric = pwrWatt / 735.49875;

    document.PowerConversion.HPImpE.value = pwrHPImpE.toFixed(3);

    document.PowerConversion.HPImpM.value = pwrHPImpM.toFixed(3);

    document.PowerConversion.HPMetric.value = pwrHPMetric.toFixed(3);

    document.PowerConversion.Watt.value = pwrWatt.toFixed(1);

```
    return true;
```
```
}
```
```
 
```
```
function changedHPImpM( ) {
```

    var pwrHPImpM = parseFloat( document.PowerConversion.HPImpM.value );

    var pwrWatt = pwrHPImpM * 745.69987158227022;

```
    var pwrHPImpE = pwrWatt / 746;
```

    var pwrHPMetric = pwrWatt / 735.49875;

    document.PowerConversion.HPImpE.value = pwrHPImpE.toFixed(3);

    document.PowerConversion.HPImpM.value = pwrHPImpM.toFixed(3);

    document.PowerConversion.HPMetric.value = pwrHPMetric.toFixed(3);

    document.PowerConversion.Watt.value = pwrWatt.toFixed(1);

```
    return true;
```
```
}
```
```
 
```
```
function changedHPMetric( ) {
```

    var pwrHPMetric = parseFloat( document.PowerConversion.HPMetric.value );

    var pwrWatt = pwrHPMetric * 735.49875;

```
    var pwrHPImpE = pwrWatt / 746;
```

    var pwrHPImpM = pwrWatt / 745.69987158227022;

    document.PowerConversion.HPImpE.value = pwrHPImpE.toFixed(3);

    document.PowerConversion.HPImpM.value = pwrHPImpM.toFixed(3);

    document.PowerConversion.HPMetric.value = pwrHPMetric.toFixed(3);

    document.PowerConversion.Watt.value = pwrWatt.toFixed(1);

```
    return true;
```
```
}
```
```
 
```
```
function changedKelvin( ) {
```

	var tempK = Number( document.TemperatureConversion.Kelvin.value );

```
	var tempC = tempK - 273.15;
```
```
	var tempF = tempK * 1.8 - 459.67;
```

	document.TemperatureConversion.Celsius.value = tempC.toFixed(2);

	document.TemperatureConversion.Fahrenheit.value = tempF.toFixed(2);

	document.TemperatureConversion.Kelvin.value = tempK.toFixed(2);

```
	return true;
```
```
}
```
```
 
```
```
function changedKg( ) {
```

	var wtKg = parseFloat( document.WeightConversion.Kg.value );

```
	var wtPound = wtKg / 0.45359237;
```

	var wtGrain = parseInt( wtPound * 7000 );

	var wtStone = parseInt( wtPound / 14 );

	var intPound = parseInt( wtPound + 0.5 - ( 14 * wtStone ) );

```
	if ( intPound == 0 ) {
```

		var strStone = wtStone.toString( ) + " stone";

```
	} else {
```

		var strStone = wtStone.toString( ) + " stone " + intPound.toString( );

```
	}
```

	document.WeightConversion.Stone.value = strStone;

	document.WeightConversion.Grain.value = wtGrain;

	document.WeightConversion.Pound.value = WritePound( wtPound );

	document.WeightConversion.Kg.value = wtKg.toFixed(3);

```
	return true;
```
```
}
```
```
 
```
```
function changedKilometers( ) {
```

	var numkm = parseFloat( document.DistanceConversion.Kilometers.value );

```
	var nummi = numkm / 1.609344;
```
```
	var numnm = numkm / 1.852;
```

	document.DistanceConversion.Kilometers.value = numkm.toFixed(2);

	document.DistanceConversion.Miles.value = nummi.toFixed(2);

	document.DistanceConversion.Nautical.value = numnm.toFixed(2);

```
	return true;
```
```
}
```
```
 
```
```
function changedKnots( ) {
```

	var numKnots = parseFloat( document.SpeedConversion.Knots.value );

```
	var numKph = numKnots * 1.852;
```
```
	var numMph = numKph / 1.609344;
```
```
	var numMps = numKph / 3.6;
```

	document.SpeedConversion.Kph.value = numKph.toFixed(2);

	document.SpeedConversion.Mps.value = numMps.toFixed(2);

	document.SpeedConversion.Mph.value = numMph.toFixed(2);

	document.SpeedConversion.Knots.value = numKnots.toFixed(2);

```
	return true;
```
```
}
```
```
 
```
```
function changedKph( ) {
```

	var numKph = parseFloat( document.SpeedConversion.Kph.value );

```
	var numMps = numKph / 3.6;
```
```
	var numMph = numKph / 1.609344;
```
```
	var numKnots = numKph / 1.852;
```

	document.SpeedConversion.Kph.value = numKph.toFixed(2);

	document.SpeedConversion.Mps.value = numMps.toFixed(2);

	document.SpeedConversion.Mph.value = numMph.toFixed(2);

	document.SpeedConversion.Knots.value = numKnots.toFixed(2);

```
	return true;
```
```
}
```
```
 
```
```
function changedLitre( ) {
```

	var numLitre = parseFloat( document.VolumeConversion.Litre.value );

	var numGallon = numLitre / 3.785411784;

```
	var numBarrel = numGallon / 42;
```
```
	var numFlOz = numGallon * 128;
```
```
	var numPint = numGallon * 8;
```

    document.VolumeConversion.Barrel.value = numBarrel.toFixed(3);

    document.VolumeConversion.FlOz.value = numFlOz.toFixed(1);

    document.VolumeConversion.Gallon.value = numGallon.toFixed(3);

    document.VolumeConversion.Litre.value = numLitre.toFixed(3);

    document.VolumeConversion.Pint.value = numPint.toFixed(2);

```
	return true;
```
```
}
```
```
 
```
```
function changedMeters( ) {
```

	var numMeters = parseFloat( document.LengthConversion.Meters.value );

	var numFeet = Math.floor( numMeters / 0.3048 );

	var numInches = 12 * ( numMeters / 0.3048 - Math.floor( numMeters / 0.3048 ) );

	document.LengthConversion.Meters.value = numMeters.toFixed(2);

	document.LengthConversion.Feet.value = numFeet + "'" + numInches.toFixed(1) + '"';

```
	return true;
```
```
}
```
```
 
```
```
function changedMiles( ) {
```

	var nummi = parseFloat( document.DistanceConversion.Miles.value );

```
	var numkm = nummi * 1.609344;
```
```
	var numnm = numkm / 1.852;
```

	document.DistanceConversion.Kilometers.value = numkm.toFixed(2);

	document.DistanceConversion.Miles.value = nummi.toFixed(2);

	document.DistanceConversion.Nautical.value = numnm.toFixed(2);

```
	return true;
```
```
}
```
```
 
```
```
function changedMph( ) {
```

	var numMph = parseFloat( document.SpeedConversion.Mph.value );

```
	var numKph = numMph * 1.609344;
```
```
	var numMps = numKph / 3.6;
```
```
	var numKnots = numKph / 1.852;
```

	document.SpeedConversion.Kph.value = numKph.toFixed(2);

	document.SpeedConversion.Mps.value = numMps.toFixed(2);

	document.SpeedConversion.Mph.value = numMph.toFixed(2);

	document.SpeedConversion.Knots.value = numKnots.toFixed(2);

```
	return true;
```
```
}
```
```
 
```
```
function changedMps( ) {
```

	var numMps = parseFloat( document.SpeedConversion.Mps.value );

```
	var numKph = numMps * 3.6;
```
```
	var numMph = numKph / 1.609344;
```
```
	var numKnots = numKph / 1.852;
```

	document.SpeedConversion.Kph.value = numKph.toFixed(2);

	document.SpeedConversion.Mps.value = numMps.toFixed(2);

	document.SpeedConversion.Mph.value = numMph.toFixed(2);

	document.SpeedConversion.Knots.value = numKnots.toFixed(2);

```
	return true;
```
```
}
```
```
 
```
```
function changedNautical( ) {
```

	var numnm = parseFloat( document.DistanceConversion.Nautical.value );

```
	var numkm = numnm * 1.852;
```
```
	var nummi = numkm / 1.609344;
```

	document.DistanceConversion.Kilometers.value = numkm.toFixed(2);

	document.DistanceConversion.Miles.value = nummi.toFixed(2);

	document.DistanceConversion.Nautical.value = numnm.toFixed(2);

```
	return true;
```
```
}
```
```
 
```
```
function changedPascal( ) {
```

	var pressurePa = parseFloat( document.PressureConversion.Pascal.value );

```
	var pressureBar = pressurePa / 100000;
```

	var pressureAtm = pressureBar / 1.01325;

	var pressurePsi = pressureBar * 14.5037744;

	document.PressureConversion.Atmosphere.value = pressureAtm.toFixed(3);

	document.PressureConversion.Bar.value = pressureBar.toFixed(3);

	document.PressureConversion.Pascal.value = pressurePa.toFixed(0);

	document.PressureConversion.Psi.value = pressurePsi.toFixed(3);

```
	return true;
```
```
}
```
```
 
```
```
function changedPint( ) {
```

	var numPint = parseFloat( document.VolumeConversion.Pint.value );

```
	var numGallon = numPint / 8;
```
```
	var numBarrel = numGallon / 42;
```
```
	var numFlOz = numGallon * 128;
```
```
	var numLitre = numPint * 0.473176473;
```

    document.VolumeConversion.Barrel.value = numBarrel.toFixed(3);

    document.VolumeConversion.FlOz.value = numFlOz.toFixed(1);

    document.VolumeConversion.Gallon.value = numGallon.toFixed(3);

    document.VolumeConversion.Litre.value = numLitre.toFixed(3);

    document.VolumeConversion.Pint.value = numPint.toFixed(2);

```
	return true;
```
```
}
```
```
 
```
```
function changedPound( ) {
```

	var wtPound = ReadPound( document.WeightConversion.Pound.value );

	var wtGrain = parseInt( wtPound * 7000 + 0.5 );

```
	var wtKg = wtPound * 0.45359237;
```

	var wtStone = parseInt( wtPound / 14 );

	var intPound = parseInt( wtPound + 0.5 - ( 14 * wtStone ) );

```
	if ( intPound == 0 ) {
```

		var strStone = wtStone.toString( ) + " stone";

```
	} else {
```

		var strStone = wtStone.toString( ) + " stone " + intPound.toString( );

```
	}
```

	document.WeightConversion.Stone.value = strStone;

	document.WeightConversion.Grain.value = wtGrain;

	document.WeightConversion.Pound.value = WritePound( wtPound );

	document.WeightConversion.Kg.value = wtKg.toFixed(3);

```
	return true;
```
```
}
```
```
 
```
```
function changedPsi( ) {
```

	var pressurePsi = parseFloat( document.PressureConversion.Psi.value );

	var pressureBar = pressurePsi / 14.5037744;

	var pressureAtm = pressureBar / 1.01325;

	var pressurePa  = pressureBar * 100000;

	document.PressureConversion.Atmosphere.value = pressureAtm.toFixed(3);

	document.PressureConversion.Bar.value = pressureBar.toFixed(3);

	document.PressureConversion.Pascal.value = pressurePa.toFixed(0);

	document.PressureConversion.Psi.value = pressurePsi.toFixed(3);

```
	return true;
```
```
}
```
```
 
```
```
function changedRoman( ) {
```

	var numR = document.RomanNumerals.Roman.value.toUpperCase( );

	var numI = Roman2Decimal( numR ).toString( );

	document.RomanNumerals.Decimal.value = numI;

	document.RomanNumerals.Roman.value = Decimal2Roman( numI );

```
	return true;
```
```
}
```
```
 
```
```
function changedSqFt( ) {
```

	var areaSqFt = parseFloat( document.AreaConversion1.SqFt.value );

```
	var areaSqIn = areaSqFt * 144;
```
```
	var areaSqYd = areaSqFt / 9;
```
```
	var areaSqM = areaSqYd * 0.83612736;
```
```
	var areaSqKm = areaSqM / 1000000;
```
```
	var areaAre = areaSqM / 100;
```
```
	var areaHectare = areaSqM / 10000;
```
```
	var areaAcre = areaSqM / 4046.8564224;
```

	var areaSqMi = areaSqM / 2589988.110336;

	document.AreaConversion1.Acre.value = areaAcre.toFixed(4)

	document.AreaConversion1.Are.value = areaAre.toFixed(4)

	document.AreaConversion1.Hectare.value = areaHectare.toFixed(5)

	document.AreaConversion1.SqFt.value = areaSqFt.toFixed(2)

	document.AreaConversion1.SqIn.value = areaSqIn.toFixed(1)

	document.AreaConversion2.SqKm.value = areaSqKm.toFixed(6)

	document.AreaConversion2.SqM.value = areaSqM.toFixed(2)

	document.AreaConversion2.SqMi.value = areaSqMi.toFixed(6)

	document.AreaConversion2.SqYd.value = areaSqYd.toFixed(2)

```
	return true;
```
```
}
```
```
 
```
```
function changedSqIn( ) {
```

	var areaSqIn = parseFloat( document.AreaConversion1.SqIn.value );

```
	var areaSqFt = areaSqIn / 144;
```
```
	var areaSqYd = areaSqFt / 9;
```
```
	var areaSqM = areaSqYd * 0.83612736;
```
```
	var areaSqKm = areaSqM / 1000000;
```
```
	var areaAre = areaSqM / 100;
```
```
	var areaHectare = areaSqM / 10000;
```
```
	var areaAcre = areaSqM / 4046.8564224;
```

	var areaSqMi = areaSqM / 2589988.110336;

	document.AreaConversion1.Acre.value = areaAcre.toFixed(4)

	document.AreaConversion1.Are.value = areaAre.toFixed(4)

	document.AreaConversion1.Hectare.value = areaHectare.toFixed(5)

	document.AreaConversion1.SqFt.value = areaSqFt.toFixed(2)

	document.AreaConversion1.SqIn.value = areaSqIn.toFixed(1)

	document.AreaConversion2.SqKm.value = areaSqKm.toFixed(6)

	document.AreaConversion2.SqM.value = areaSqM.toFixed(2)

	document.AreaConversion2.SqMi.value = areaSqMi.toFixed(6)

	document.AreaConversion2.SqYd.value = areaSqYd.toFixed(2)

```
	return true;
```
```
}
```
```
 
```
```
function changedSqKm( ) {
```

	var areaSqKm = parseFloat( document.AreaConversion2.SqKm.value );

```
	var areaSqM = areaSqKm * 1000000;
```
```
	var areaAre = areaSqM / 100;
```
```
	var areaHectare = areaSqM / 10000;
```
```
	var areaAcre = areaSqM / 4046.8564224;
```
```
	var areaSqYd = areaSqM / 0.83612736;
```
```
	var areaSqFt = areaSqYd * 9;
```
```
	var areaSqIn = areaSqFt * 144;
```

	var areaSqMi = areaSqM / 2589988.110336;

	document.AreaConversion1.Acre.value = areaAcre.toFixed(4)

	document.AreaConversion1.Are.value = areaAre.toFixed(4)

	document.AreaConversion1.Hectare.value = areaHectare.toFixed(5)

	document.AreaConversion1.SqFt.value = areaSqFt.toFixed(2)

	document.AreaConversion1.SqIn.value = areaSqIn.toFixed(1)

	document.AreaConversion2.SqKm.value = areaSqKm.toFixed(6)

	document.AreaConversion2.SqM.value = areaSqM.toFixed(2)

	document.AreaConversion2.SqMi.value = areaSqMi.toFixed(6)

	document.AreaConversion2.SqYd.value = areaSqYd.toFixed(2)

```
	return true;
```
```
}
```
```
 
```
```
function changedSqM( ) {
```

	var areaSqM = parseFloat( document.AreaConversion2.SqM.value );

```
	var areaSqKm = areaSqM / 1000000;
```
```
	var areaAre = areaSqM / 100;
```
```
	var areaHectare = areaSqM / 10000;
```
```
	var areaAcre = areaSqM / 4046.8564224;
```
```
	var areaSqYd = areaSqM / 0.83612736;
```
```
	var areaSqFt = areaSqYd * 9;
```
```
	var areaSqIn = areaSqFt * 144;
```

	var areaSqMi = areaSqM / 2589988.110336;

	document.AreaConversion1.Acre.value = areaAcre.toFixed(4)

	document.AreaConversion1.Are.value = areaAre.toFixed(4)

	document.AreaConversion1.Hectare.value = areaHectare.toFixed(5)

	document.AreaConversion1.SqFt.value = areaSqFt.toFixed(2)

	document.AreaConversion1.SqIn.value = areaSqIn.toFixed(1)

	document.AreaConversion2.SqKm.value = areaSqKm.toFixed(6)

	document.AreaConversion2.SqM.value = areaSqM.toFixed(2)

	document.AreaConversion2.SqMi.value = areaSqMi.toFixed(6)

	document.AreaConversion2.SqYd.value = areaSqYd.toFixed(2)

```
	return true;
```
```
}
```
```
 
```
```
function changedSqMi( ) {
```

	var areaSqMi = parseFloat( document.AreaConversion2.SqMi.value );

	var areaSqM = areaSqMi * 2589988.110336;

```
	var areaSqKm = areaSqM / 1000000;
```
```
	var areaAre = areaSqM / 100;
```
```
	var areaHectare = areaSqM / 10000;
```
```
	var areaAcre = areaSqM / 4046.8564224;
```
```
	var areaSqYd = areaSqM / 0.83612736;
```
```
	var areaSqFt = areaSqYd * 9;
```
```
	var areaSqIn = areaSqFt * 144;
```

	document.AreaConversion1.Acre.value = areaAcre.toFixed(4)

	document.AreaConversion1.Are.value = areaAre.toFixed(4)

	document.AreaConversion1.Hectare.value = areaHectare.toFixed(5)

	document.AreaConversion1.SqFt.value = areaSqFt.toFixed(2)

	document.AreaConversion1.SqIn.value = areaSqIn.toFixed(1)

	document.AreaConversion2.SqKm.value = areaSqKm.toFixed(6)

	document.AreaConversion2.SqM.value = areaSqM.toFixed(2)

	document.AreaConversion2.SqMi.value = areaSqMi.toFixed(6)

	document.AreaConversion2.SqYd.value = areaSqYd.toFixed(2)

```
	return true;
```
```
}
```
```
 
```
```
function changedSqYd( ) {
```

	var areaSqYd = parseFloat( document.AreaConversion2.SqYd.value );

```
	var areaSqM = areaSqYd * 0.83612736;
```
```
	var areaSqKm = areaSqM / 1000000;
```
```
	var areaAre = areaSqM / 100;
```
```
	var areaHectare = areaSqM / 10000;
```
```
	var areaAcre = areaSqM / 4046.8564224;
```
```
	var areaSqFt = areaSqYd * 9;
```
```
	var areaSqIn = areaSqFt * 144;
```

	var areaSqMi = areaSqM / 2589988.110336;

	document.AreaConversion1.Acre.value = areaAcre.toFixed(4)

	document.AreaConversion1.Are.value = areaAre.toFixed(4)

	document.AreaConversion1.Hectare.value = areaHectare.toFixed(5)

	document.AreaConversion1.SqFt.value = areaSqFt.toFixed(2)

	document.AreaConversion1.SqIn.value = areaSqIn.toFixed(1)

	document.AreaConversion2.SqKm.value = areaSqKm.toFixed(6)

	document.AreaConversion2.SqM.value = areaSqM.toFixed(2)

	document.AreaConversion2.SqMi.value = areaSqMi.toFixed(6)

	document.AreaConversion2.SqYd.value = areaSqYd.toFixed(2)

```
	return true;
```
```
}
```
```
 
```
```
function changedStone( ) {
```

	var strStone = document.WeightConversion.Stone.value;

	var pattern = /^\d+\s+stone(\s+\d+)?$/i;

	if ( strStone.search( pattern ) == -1 ) {

		alert( "Stones (and pounds) must be input as\n\n\t<stones> stone [ <pounds> ]\n\nE.g. 18 pounds must be input as\n\n\t1 stone 4\n\nAnd 28 pounds must be input as\n\n\t2 stone" );

```
		return false;
```
```
	}
```
```
	var arrStone = new Array( );
```
```
	arrStone = strStone.split( " " );
```
```
	if ( arrStone.length > 2 ) {
```

		var wtPound = ( 14 * parseInt( arrStone[0] ) ) + parseInt( arrStone[2] );

```
	} else {
```

		var wtPound = 14 * parseInt( arrStone[0] );

```
	}
```

	var wtGrain = parseInt( wtPound * 7000 + 0.5 );

```
	var wtKg = wtPound * 0.45359237;
```

	var wtStone = parseInt( wtPound / 14 );

	var intPound = parseInt( wtPound + 0.5 - ( 14 * wtStone ) );

```
	if ( intPound == 0 ) {
```

		var strStone = wtStone.toString( ) + " stone";

```
	} else {
```

		var strStone = wtStone.toString( ) + " stone " + intPound.toString( );

```
	}
```

	document.WeightConversion.Stone.value = strStone;

	document.WeightConversion.Grain.value = wtGrain;

	document.WeightConversion.Pound.value = WritePound( wtPound );

	document.WeightConversion.Kg.value = wtKg.toFixed(3);

```
	return true;
```
```
}
```
```
 
```
```
function changedWatt( ) {
```

    var pwrWatt = parseFloat( document.PowerConversion.Watt.value );

```
    var pwrHPImpE = pwrWatt / 746;
```

    var pwrHPImpM = pwrWatt / 745.69987158227022;

    var pwrHPMetric = pwrWatt / 735.49875;

    document.PowerConversion.HPImpE.value = pwrHPImpE.toFixed(3);

    document.PowerConversion.HPImpM.value = pwrHPImpM.toFixed(3);

    document.PowerConversion.HPMetric.value = pwrHPMetric.toFixed(3);

    document.PowerConversion.Watt.value = pwrWatt.toFixed(1);

```
    return true;
```
```
}
```
```
 
```
```
function Decimal2Roman( numDecimal ) {
```

	var intDecimal = parseInt( numDecimal );

```
	var strRoman = "";
```

	// First, add an "M" for every multiple of 1000

```
	while ( intDecimal >= 1000 ) {
```
```
		intDecimal = intDecimal - 1000;
```
```
		strRoman = strRoman + "M";
```
```
	}
```

	// Next, add "CM" for 900, or "D" for 500, or "CD" for 400

```
	if ( intDecimal >= 900 ) {
```
```
		intDecimal = intDecimal - 900;
```
```
		strRoman = strRoman + "CM";
```
```
	} else if ( intDecimal >= 500 ) {
```
```
		intDecimal = intDecimal - 500;
```
```
		strRoman = strRoman + "D";
```
```
	} else if ( intDecimal >= 400 ) {
```
```
		intDecimal = intDecimal - 400;
```
```
		strRoman = strRoman + "CD";
```
```
	}
```

	// Add a "C" for every remaining multiple of 100

```
	while ( intDecimal >= 100 ) {
```
```
		intDecimal = intDecimal - 100;
```
```
		strRoman = strRoman + "C";
```
```
	}
```

	// Add "XC" for 90, or "L" for 50, or "XL" for 40

```
	if ( intDecimal >= 90 ) {
```
```
		intDecimal = intDecimal - 90;
```
```
		strRoman = strRoman + "XC";
```
```
	} else if ( intDecimal >= 50 ) {
```
```
		intDecimal = intDecimal - 50;
```
```
		strRoman = strRoman + "L";
```
```
	} else if ( intDecimal >= 40 ) {
```
```
		intDecimal = intDecimal - 40;
```
```
		strRoman = strRoman + "XL";
```
```
	}
```

	// Add an "X" for every remaining multiple of 10

```
	while ( intDecimal >= 10 ) {
```
```
		intDecimal = intDecimal - 10;
```
```
		strRoman = strRoman + "X";
```
```
	}
```

	// Add "IX" for 9, or "V" for 5, or "IV" for 4

```
	if ( intDecimal >= 9 ) {
```
```
		intDecimal = intDecimal - 9;
```
```
		strRoman = strRoman + "IX";
```
```
	} else if ( intDecimal >= 5 ) {
```
```
		intDecimal = intDecimal - 5;
```
```
		strRoman = strRoman + "V";
```
```
	} else if ( intDecimal >= 4 ) {
```
```
		intDecimal = intDecimal - 4;
```
```
		strRoman = strRoman + "IV";
```
```
	}
```

	// Finally, add an "I" for every remaining multiple of 1

```
	while ( intDecimal >= 1 ) {
```
```
		intDecimal = intDecimal - 1;
```
```
		strRoman = strRoman + "I";
```
```
	}
```
```
	// Return the result
```
```
	return strRoman;
```
```
}
```
```
 
```
```
function ReadPound( strPound ) {
```

	// var strPound = document.WeightConversion.Pound.value;

```
	var pattern = /\d+\s+\d+\/16/;
```

	if ( strPound.search( pattern ) != -1 ) {

```
		var arrPound = new Array( );
```
```
		arrPound = strPound.split( " " );
```

		var numPound = parseInt( arrPound[0] );

```
		if ( arrPound.length > 1 ) {
```
```
			var arrOunce = new Array( );
```
```
			arrOunce = arrPound[1].split( "/" );
```

			numPound = numPound + ( parseInt( arrOunce[0] ) / 16 );

```
		}
```
```
		return numPound;
```
```
	} else {
```
```
		return parseFloat( strPound );
```
```
	}
```
```
}
```
```
 
```
```
function Roman2Decimal( strRoman ) {
```
```
	var intRoman = 0;
```
```
	var arrRoman = [];
```
```
	var i;
```

	// Store each "digit" of the Roman numeral in an array

	for ( i = 0; i < strRoman.length; i++ ) {

		arrRoman[i] = strRoman.substring( i, i + 1 ).toUpperCase( );

```
	}
```

	// Then convert each "digit" to its numeric value

	for ( i = 0; i < arrRoman.length; i++ ) {

```
		switch ( arrRoman[i] ) {
```
```
			case "M": {
```
```
				arrRoman[i] = 1000;
```
```
				break;
```
```
			}
```
```
			case "D": {
```
```
				arrRoman[i] = 500;
```
```
				break;
```
```
			}
```
```
			case "C": {
```
```
				arrRoman[i] = 100;
```
```
				break;
```
```
			}
```
```
			case "L": {
```
```
				arrRoman[i] = 50;
```
```
				break;
```
```
			}
```
```
			case "X": {
```
```
				arrRoman[i] = 10;
```
```
				break;
```
```
			}
```
```
			case "V": {
```
```
				arrRoman[i] = 5;
```
```
				break;
```
```
			}
```
```
			case "I": {
```
```
				arrRoman[i] = 1;
```
```
				break;
```
```
			}
```
```
		}
```
```
	}
```

	// Now comes the hard part: for each "digit" decide if it will be

	// added or subtracted, based on the value of the following "digit"

	for ( i = 0; i < arrRoman.length - 1; i++ ) {

```
		if ( arrRoman[i] < arrRoman[i+1] ) {
```
```
			// E.g. "I" in "IX" (9): subtract 1
```
```
			intRoman = intRoman - arrRoman[i];
```

		} else if ( arrRoman[i] == arrRoman[i+1] ) {

			// E.g. "I" in "XII" (12), "III" (3) or in "IIX" (ancient notation for 8).

			// The latter should actually be "VIII" in "modern" roman numerals, but

			// "IIX" was used in ancient times, so let's just be prepared.

			// We'll add the value to the next position in the array, so it will be

			// reevaluated in the next iteration of the loop.

			// Note: this trick will definitely fail on invalid notations like "IIIX".

			arrRoman[i+1] = arrRoman[i] + arrRoman[i+1];

```
			arrRoman[i] = 0;
```
```
		} else {
```
```
			// arrRoman( i ) > arrRoman( i + 1 )
```
```
			// E.g. "V" in "XV" (15): add 5
```
```
			intRoman = intRoman + arrRoman[i];
```
```
		}
```
```
	}
```

	// The last "digit" doesn't have a following "digit" so it

	// can be added without having to test a following "digit"

	intRoman = intRoman + arrRoman[arrRoman.length-1];

```
	// Return the calculated value
```
```
	return intRoman;
```
```
}
```
```
 
```
```
function WritePound( numPound ) {
```
```
	var intPound = parseInt( numPound );
```
```
	var strPound = intPound.toString( ); 
```

	var intOunce = parseInt( ( numPound - intPound ) * 16 + 0.5 );

```
	if ( intOunce > 0 ) {
```

		strPound = strPound + "  " + intOunce.toString( ) + "/16";

```
	}
```
```
	return strPound;
```
```
}
```
```
 
```

JavaScript source code for conversions