Common Measurement Conversions In PHP

One of the tricky things about being a web developer is that you are sometimes forced to accommodate visitors that use different measurement systems and formats. Currency symbols, date formats and measurement systems; all of them can differ from one user to the next. The following PHP code snippets will help you to convert between some of the most common measurements (most notably, those found in the Imperial System and the Metric System).

Kilograms to Pounds

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function kilogramsToPounds($kg){     return $kg * 2.20462; }

As you can see, it’s as simple as multiplying the number of KG by 2.20462. In fact, you’ll find that most of the subsequent examples are just as straight-forward.

Pounds to Kilograms

While Pounds (lb) is a popular measurement for weight in the United States; in Europe, they tend to use Kilograms:

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function poundsToKilograms($pounds){     return $pounds * 0.453592; }

Stone to Kilograms

To convert Stone into KG, multiply by 6.35029:

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function stoneToKilograms($stone){     return $stone * 6.35029; }

Kilometres to Miles

KM x 0.621371 = Miles

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function kilometersToMiles($km){     return $km * 0.621371; }

Miles to Kilometres

Miles x 1.60934 = KM

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function milesToKilometers($miles){     return $miles * 1.60934; }

Pounds to Stone

Pounds x 0.0714286 = Stone

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function poundsToStone($pounds){     return $pounds * 0.0714286; }

Yards to Meters

Yards x 0.9144 = Meters

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function yardsToMeters($yards){     return $yards * 0.9144; }

Centimetres to Meters

There are 100 centimetres in a meter:

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function centimetersToMeters($centimeters){     return $centimeters * 0.01; }

Meters to Centimetres

And vice versa:

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function metersToCentimeters($meters){     return $meters * 100; }

Centimetres to Inches

There are 39.3700787 inches in a meter:

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function centimetersToInches($centimeters){     return ($centimeters * 0.01) * 39.3700787; }

Meters to Miles

Meters x 0.000621371 = Miles

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function metersToMiles($meters){     return $meters * 0.000621371; }

Inches to Centimetres

Centimetres = Inches x 2.54

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function inchesToCentimeters($inches){     return $inches * 2.54; }

Fahrenheit to Celsius

As you can see, converting Fahrenheit to Celsius is not as simple as the conversions shown above:

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function fahrenheitToCelsius($fahrenheit){     return ($fahrenheit - 32) * 5 / 9; }

Celsius to Fahrenheit

Converting Celsius into Fahrenheit isn’t exactly straight forward either:

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function celsiusToFahrenheit($celsius){     return $celsius * 9/5 + 32; }