Conversion factors: Imperial to Metric

Length

Multiply by

inches

millimetres

25.4

inches

centimetres

2.54

feet

metres

0.3048

yards

metres

0.9144

statute miles

kilometres

1.6093

nautical miles

kilometres

1.852

Area

Multiply by

square inches

square centimetres

6.4516

square feet

square metres

0.0929

square yards

square metres

0.8361

acres

hectares

0.4047

square miles

square kilometres

2.5899

Volume

Multiply by

cubic inches

cubic centimetres

16.3871

cubic feet

cubic metres

0.0283

cubic yards

cubic metres

0.7646

Liquid Volume

Multiply by

fluid ounces (UK)

litres

0.0284

fluid ounces (US)

litres

0.0296

pints (UK)

litres

0.5682

pints (US)

litres

0.4732

gallons (UK)

litres

4.546

gallons (US)

litres

3.7854

Weight

Multiply by

ounces (avoirdupois)

grams

28.3495

ounces (troy)

grams

31.1035

pounds

kilograms

0.4536

tons (long)

tonnes

1.016