Metric Conversions

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Inches to centimetres

2.54

Centimetres to inches

0.39

Feet to metres

0.3

Meters to feet

3.28

Square inches to square centimetres

6.45

Square centimetres to square inches

0.155

Square inches to square decimetres

0.0645

Square decimetres to square inches

15.5

Square feet to square decimetres

9.3

Square decimetres to square feet

0.107

Cubic inches to cubic centimetres

16.39

Cubic centimetres to cubic inches

0.061

Cubic feet to cubic metres

0.028

Cubic metres to cubic feet

35.3

Pounds to kilogrammes

0.45

Kilogrammes to pounds

2.2

English H.P (746 watts) to metric elec H.P

1.02

Metric H.P (736 watts) to English elec H.P

0.98

Pounds per square inch to kilogrammes per square cm.

0.0703

Kilogrammes per square cm. to pounds per square inch.

14.223

Grains to grammes

0.0648

Grammes to grains

15.43

Ounces avoirdupois to ounces troy

0.911

Ounces troy to ounces avoirdupois

1.097

Ounces per gallon (Imperial) to grammes per litre

6.25

Grammes per litre to ounces per gallon (Imperial)

0.16

Grammes per litre to grains per gallon (Imperial)

70

Grains per gallon (Imperial) to grammes per litre

0.0142

Gallons (Imperial) to litres

4.5

Litre to gallons (Imperial)

0.22

Fluid ounces to millilitres (cubic cm)

28.35

Millilitres (cubic cm) to fluid ounces

0.035

English (imperial) gallons to USA gallons

1.2

USA gallons to English gallons

0.833

Troy Weight
24 grains = 1 dwt. = 1.5552 grammes 
20 dwt. = 1 oz. = 31.1035 grammes 
12 oz. = 1 lb = 373.242 grammes 

Avoirdupois Weight
16 drams = 1 oz. = 28.35 grammes 
16 ox. = 1 lb. = 453.60 grammes