preproom.orgThe online science prep room
You are here: Info Library > General Data > Imperial and Metric Conversions
Info Library

General Data > Imperial and Metric Conversions

The charts below may be useful in assisting you to convert values from imperial to metric and vice-versa. They are arranged into relevant groups. In some cases we have also included the American equivalent as sometimes American science websites and books are used in schools and may include these imperial/obsolete units.

Area Conversion

Imperial/USA unit    Metric (SI) unit Metric (SI) unit Imperial/USA
unit
Acre 0.40 hectare Hectare 2.47 acres
Square inch 6.45 square centimetres Square centimetre 0.16 square inches
Square foot 0.09 square metres Square metre  
Square yard 0.84 square metres Square metre 1.20 square yards
Square mile 2.60 square kilometres Square kilometre 0.39 square miles
Cubic foot 0.028 cubic metres Cubic metre 35.23 cubic feet
Cubic yard 0.76 cubic metres

Volume Conversion

Imperial/USA unit Metric (SI) unit Metric (SI) unit Imperial/USA unit
Teaspoon (UK) 5.92 millilitres Millilitre 0.17 teaspoons (UK)
Teaspoon (US) 4.93 millilitres 0.20 teaspoons (US)
Tablespoon (UK) 17.76 millilitres 10 Millilitre 0.56 tablespoons (UK)
Tablespoon (US) 14.79 millilitres 0.68 tablespoons (US)
Fluid ounce (UK) 28.41 millilitres 100 millilitre 3.52 fluid ounces (UK)
Fluid ounce (US) 29.57 millilitres 3.38 fluid ounces (US)
Pint (UK) 0.57 litres Litre 1.76 pints (UK)
Pint (US) 0.47 litres 2.11 pints (US)
Quart (UK) 1.14 litres 0.88 quarts (UK)
Quart (US) 0.95 litres 1.06 quarts (US)
Gallon (UK) 4.55 litres 0.22 gallon (UK)
Gallon (US) 3.79 litres 0.26 gallons (US)

Length Conversion

Imperial/USA unit Metric (SI) unit Metric (SI) unit Imperial/USA unit
Inch 2.54 centimetres Centimetre 0.39 inches
Foot 30.48 centimetres Metre 3.28 feet
Yard 0.91 metres Metre 1.09 yards
Mile 1.61 kilometres Kilometre 0.62 miles

Weight Conversion

Imperial/USA unit Metric (SI) unit Metric (SI) unit Imperial/USA unit
Ounce (weight) 28.35 grams Gram 0.035 ounces
Pound 0.45 kilograms Kilogram 2.21 pounds
UK tons (2240 pounds) 1.02 metric tonnes Metric tonne (1000 kg) 0.98 UK tons
US ton (2000 pounds) 0.91 metric tons Metric ton (1000 kg) 1.10 US tons

Temperature Conversions

For temperature conversions from Celsius to Fahrenheit and vice-versa, use the following equation:

To convert Fahrenheit to Celsius, subtract 32 degrees and divide by 1.8.

To convert Celsius to Fahrenheit, multiply by 1.8 and add 32 degrees.