Conversion Formulae:

To Convert Multiply By: To Convert: Multiply By:

inches to centimetres 2.540 centimetres to inches 0.3937

feet to metres 0.3048 metres to feet 3.281

yards to metres 0.9144 metres to yards 1.094

miles to kilometres 1.609 kilometres to miles 0.6214

square inches to square centimetres 6.452 square centimetres to square inches 0.1550

square metres to square feet 10.76 square feet to square metres 0.0929

square yards to square metres 0,8361 square metres to square yards 1.196

square miles to square kilometres 2.590 square kilometres to square miles 0.3861

acres to hectares 0.4047 hectares to acres 2.471

cubic inches to cubic centimetres 16.39 cubic centimetres to cubic inches 0.6102

cubic feet to cubic metres 0.02832 cubic metres to cubic feet 35.31

cubic yards to cubic metres 0.7646 cubic metres to cubic yards 1.308

cubic inches to litres 0.01639 litres to cubic inches 61.03

gallons to litres 4.546 litres to gallons 0.22

grains to grams 0.0648 grams to grains 15.43

ounces to grams 28.36 grams to ounces 0.03527

pounds to grams 453.6 grams to pounds 0.002205

pounds to kilograms 0.4536 kilograms to pounds 2.205

tons to kilograms 1016.00 kilograms to tons 0.000984

Tyre pressure conversion factors:

Lbs/sq. inches: 20 22 24 26 28 30 32 34

Bars: 1.38 1.52 1.65 1.79 1.93 2.07 2.21 2.34

Speeds:

MPH: 20 30 40 50 60 70 80 90 100

KPH 32 48 64 80 96 112 128 144 160

Temperature:

Farenheit      32 40 50 60 70 75 85 95 105 140 175 212

Celcius     0 5 10 15 20 25 30 35 40 60 80 100

Inches millimetres miles kilometres feet metres cubic feet cubic metres

0.039 1 25.40 0.621 1 1.609 3.281 1 0.305 35.315 1 0.028

0.079 2 50.80 1.243 2 3.219 6.562 2 0.610 70.629 2 0.057

0.118 3 76.20 1.864 3 4.828 9.843 3 0.914 105.943 3 0.085

0.157 4 101.60 2.485 4 6.437 13.123 4 1.219 141.258 4 0.113

0.197 5 127.00 3.107 5 8.047 16.404 5 1.524 176.572 5 0.142

0.236 6 152.40 3.728 6 9.656 19.685 6 1.829 211.887 6 0.170

0.276 7 177.80 4.350 7 11.265 22.966 7 2.134 247.201 7 0.198

0.315 8 203.20 4.971 8 12.875 26.247 8 2.438 282.516 8 0.227

0.354 9 228.60 5.592 9 14.484 29.528 9 2.743 317.830 9 0.255

cu yards cu metres pints litres sq feet sq metres yards metres

1.308 1 0.765 1.761 1 0.568 10.764 1 0.093 1.094 1 0.914

2.616 2 1.529 3.521 2 1.136 21.528 2 0.186 2.187 2 1.829

3.924 3 2.294 5.282 3 1.704 32.292 3 0.279 3.281 3 2.743

5.232 4 3.058 7.043 4 2.272 43.056 4 0.372 4.375 4 3.658

6.540 5 3.823 8.804 5 2.840 53.819 5 0.465 5.468 5 4.572

7.848 6 4.587 10.564 6 3.408 64.583 6 0.557 the key figure in red in the centre column

9.156 7 5.352 12.235 7 3.976 75.347 7 0.650 can be read as either metric or imperial

10.464 8 6.117 14.086 8 4.544 86.111 8 0.743 measure. Thus 1 metre= 1.09 yards

11.772 9 6.881 15.847 9 5.112 96.875 9 0.836 or 1 yard = 0.91 metres