Length	Multiply by
Inches to Centimetres	2.54
Centimetres to Inches	0.39
Inches to Millimetres	25.40
Millimetres to Inches	0.04
Feet to Metres	0.31
Metres to Feet	3.28
Yards to Metres	0.91
Metres to Yards	1.09
Miles to Kilometres	1.61
Kilometres to Miles	0.62

Area	Multiply by
Square Inches to Square Centimetres	6.451
Square Centimetres to Square Inches	0.15
Square Feet to Square Metres	0.09
Square Metres to Square Feet	10.76
Square Yards to Square Metres	0.84
Square Metres to Square Yards	1.20
Square Miles to Square Kilometres	2.59
Square Kilometres to Square Miles	0.39
Acres to Hectares	0.40
Hectares to Acres	2.47

Volume	Multiply by
Cubic Inches to Cubic Centimetres	16.39
Cubic Centimetres to Cubic Inches	0.06
Cubic Feet to Cubic Metres	0.03
Cubic Metres to Cubic Feet	35.32
Cubic Yards to Cubic Metres	0.76
Cubic Metres to Cubic Yards	1.31
Cubic Inches to Litres	0.02
Litres to Cubic Inches	61.03
Gallons to Litres	4.55
Litres to Gallons	0.22
US Gallons to Litres	3.79
Litres to US Gallons	0.26
Fluid Ounces to Cubic Millilitres	30.77
Cubic Millilitres to Fluid Ounces	0.03

Weight	Multiply by
Ounces to Grams	28.35
Grams to Ounces	0.04
Pounds to Kilograms	0.45
Kilograms to Pounds	2.21
Long Tons to Tonnes	1.02
Tonnes to Long Tons	0.98
Short Tons to Tonnes	0.91
Tonnes to Short Tons	1.10