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Imperial units conversions.

The following list gives some useful formulae for converting from imperial to metric units.

Property

Conversion

 

 

Length

 

Miles to Kilometres

Multiply by 1.609

Yards to Metres

Multiply by 0.914

Feet to Metres

Multiply by 0.305

Inches to millimetres

Multiply by 25.4

 

 

Area

 

Square miles to Square kilometres

Multiply by 2.59

Square miles to Hectares

Multiply by 258.999

Acres to Square metres

Multiply by 4046.86

Square yards to Square metres

Multiply by 0.836

Square feet to Square metres

Multiply by 0.093

 

 

Volume

 

 Cubic yards to Cubic metres

Multiply by 0.764

Cubic feet to Cubic metres

Multiply by 0.028

 

 

Capacity

 

Gallons to Litres

Multiply by 4.546

U.S. Gallons to Litres

Multiply by 3.785

 

 

Acceleration

 

Feet/Sec/Sec to Metres/Sec/Sec

Multiply by 0.305

 

 

Velocity

 

Miles/Hour to Kilometres/Hour

Multiply by 1.609

Feet/Sec to Metres/Sec

Multiply by 0.305

 

 

Mass

 

Tons to Kilogrammes

Multiply by 1016.05

Hundredweights to Kilogrammes

Multiply by 50.802

Pounds to Kilograms

Multiply by 0.453

 

 

Fuel consumption

 

Gallons / Mile to Litres / Kilometre

Multiply by 2.825

Miles / Gallon to Kilometres /Litre

Multiply by 0.354

 

 

Energy

 

Therms to Megajoules

Multiply by 105.506

British Thermal Units to Kilojoules

Multiply by 1.055

Kilowatt-hours to  Megajoules

Multiply by 3.6

 

 

Power

 

Horsepower to Kilowatts

Multiply by 0.746

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