Conversion Factors

Imperial to Metric

Inches to Millimetres	multiply by 25.4
Inches to Centimetres	multiply by 2.54
Feet to Centimetres	multiply by 30.48
Feet to Metres	multiply by 0.3048
Yards to Metres	multiply by 0.9144
Miles to Metres	multiply by 1,609.3
Miles to Kilometres	multiply by 1.609
Nautical Miles to Metres	multiply by 1,853.27
Sq. Inches to Sq. Millimetres	multiply by 645.160
Sq. Inches to Sq. Centimetres	multiply by 6.452
Sq. Feet to Sq. Metres	multiply by 0.0929
Sq. Yards to Sq. Metres	multiply by 0.835
Sq. Miles to Sq. Kilometres	multiply by 2.590
Acres to Sq. Kilometres	multiply by 0.004047
Acres to Hectares	multiply by 0.4047
Cubic Inches to Cubic Centimetres	multiply by 16.36
Cubic Feet to Cubic Metres	multiply by 0.03
Cubic Yards to Cubic Metres	multiply by 0.76
Cubic Inches to Litres	multiply by 0.01639
Grains to Grammes	multiply by 0.648
Ounces to Grammes	multiply by 28.35
Pounds to Grammes	multiply by 453.6
Pounds to Kilogrammes	multiply by 0.4536
Cwt to Kilogrammes	multiply by 1,016
Tons to Kilogrammes	multiply by 1.016
Tons to Tonnes	multiply by 1.016
Pints to Litres	multiply by 0.5682
Imperial Gallons to Litres	multiply by 4.546
Fahrenheit to Centigrade	minus 32 degrees multiply by 0.5555

Metric to Imperial

Millimetres to Inches	multiply by 0.03937
Centimetres to Inches	multiply by 0.3937
Centimetres to Feet	multiply by 0.0328
Metres to Feet	multiply by 3.281
Metres to Yards	multiply by 1.094
Metres to Miles	multiply by 0.000621
Kilometres to Miles	multiply by 0.6214
Metres to Nautical Miles	multiply by 0.000539
Sq. Millimetres to Sq. Inches	multiply by 0.001550
Sq. Centimetres to Sq. Inches	multiply by 0.155
Sq. Metres to Sq. Feet	multiply by 10.764
Sq. Metres to Sq. Yards	multiply by 1.196
Sq. Kilometres to Sq. Miles	multiply by 0.3861
Sq. Kilometres to Acres	multiply by 247.1
Hectares to Acres	multiply by 2.471
Cubic Centimetres to Cubic Inches	multiply by 0.061
Cubic Metres to Cubic Feet	multiply by 35.3
Cubic Metres to Cubic Yards	multiply by 1.316
Litres to Cubic Inches	multiply by 61.03
Grammes to Grains	multiply by 15.43
Grammes to Ounces	multiply by 0.03527
Grammes to Pounds	multiply by 0.002205
Kilogrammes to Pounds	multiply by 2.205
Kilogrammes to Cwt	multiply by 0.01968
Kilogrammes to Tons	multiply by 0.0009842
Tonnes to Tons	multiply by 0.9842
Litres to Pints	multiply by 1.76
Litres to Imperial Gallons	multiply by 0.22
Centigrade to Fahrenheit	multiply by 1.8 add 32 degrees