Imperial Conversion Factors

Imperial Conversion Factors to Find Metric Measurements

Imperial conversion factors is a handy tool when working between the metric and imperial systems. Feel free to print it off and store it beside your scale rule and calculator for easy reference. You never know when you may need it, the designer’s motto “Have it on Hand”.

Imperial to Metric Conversion Factors

Inches to millimetres x 25.4

Feet to millimetres x 0.3048

Links to metres x 0.201168

Miles to kilometres x 1.609

Square inches to square millimetres x 654.16

Square feet to square millimetres x 0.929

Measurements

Length

1 Mile = 1.6091 kilometre

1 Chain = 20.1168 metres

1 Yard = 0.9144 metres

1 Foot = 0.3048 metres

1 Inch = 25.4 millimetres

Area

1 Square Mile = 2.590 square kilometres or 259.0 hectares

1 Hectare = 10,000 square metres

1 Acre = 4046.9 square metres or 0.40469 hectares

1 Square Yard = 0.8361 square metres

1 Square Foot = 0.09290 square metres

1 Square Inch = 645.2 square millimetres

Capacity

1 UK Gallon = 4.456 litres

1 US Gallon = 3.758 litres

1 UK Quart = 1.137 litres

1 US Quart = 1.101 litres

Weight

1 UK Ton = 1016.5 kilograms

1 US Ton = 907.2 kilograms

1 UK Hundredweight = 50.8 kilograms

1 US Hundredweight = 45.36 kilograms

1 Pound = 0.4536 kilograms

1 Troy Ounce = 31.10 grams

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