
Automotive Conversion Tables
Sorting out all of those units
Taken from 21st Century Performance, by Julian Edgar
Click on pics to view larger images



Length
To convert: 
to: 
multiply by: 
Inches 
Millimetres 
25.4 
Centimetres 
Inches 
0.394 
Thousandths of an inch 
Millimetres 
0.0254 
Millimetres 
Thousandths of an inch 
39.4 
Feet 
Centimetres 
30.5 
Mass
To convert: 
to: 
multiply by: 
Pounds 
Kilograms 
0.454 
Kilograms 
Pounds 
2.20 
Area
To convert: 
to: 
multiply by: 
Square inches 
Square centimetres 
6.45 
Square centimetres 
Square inches 
0.155 
Square feet 
Square metres 
0.093 
Square metres 
Square feet 
10.8 
Volume & Flow
To convert: 
to: 
multiply by: 
English gallons 
Litres 
4.55 
Litres 
English gallons 
0.220 
US gallons 
Litres 
3.79 
Litres 
US gallons 
0.264 
US gallons 
English gallons 
0.833 
English gallons 
US gallons 
1.20 
Cubic inches 
Cubic centimetres 
16.4 
Cubic centimetres 
Cubic inches 
0.061 
Cubic feet 
Cubic metres 
0.0283 
Cubic metres 
Cubic feet 
35.3 
Cubic feet per minute 
Cubic metres per hour 
1.70 
Cubic metres per hour 
Cubic feet per minute 
0.589 
Litres per hour 
English gallons per hour 
0.220 
English gallons per hour 
Litres per hour 
4.55 
Litres per hour 
US Gallons per hour 
0.264 
US gallons per hour 
Litres per hour 
3.79 
Litres per second 
Cubic metres per hour 
3.60 
Cubic metres per hour 
Litres per second 
0.278 
Litres per second 
Cubic feet per minute 
2.12 
Cubic feet per minute 
Litres per second 
0.472 
Litres per second 
Cubic feet per hour 
127 
Cubic feet per hour 
Litres per second 
0.00786 
Kilograms of air per second 
Pounds of air per second 
2.20 
Pounds of air per second 
Kilograms of air per second 
0.0454 
Pounds of air per second 
Kilograms of air per hour 
1630 
Kilograms of air per hour 
Pounds of air per second 
0.000612 
Pounds of air per second 
Pounds of air per hour 
3600 
Pounds of air per hour 
Pounds of air per second 
0.000278 
Kilograms of air per second 
Pounds of air per hour 
7940 
Pounds of air per hour 
Kilograms of air per second 
0.000126 
Velocity
To convert: 
to: 
multiply by: 
Miles per hour 
Kilometres per hour 
1.61 
Kilometres per hour 
miles per hour 
0.622 
Metres per second 
Kilometres per hour 
3.60 
Kilometres per hour 
Metres per second 
0.278 
Metres per second 
Miles per hour 
2.24 
Miles per hour 
Metres per second 
0.447 
Pressure
To convert: 
to: 
multiply by: 
Pounds per square inch 
Bar 
0.069 
Bar 
Pounds per square inch 
14.50 
Pounds per square inch 
Kilopascals 
6.90 
Kilopascals 
Pounds per square inch 
0.145 
Inches of mercury 
Kilopascals 
3.39 
Kilopascals 
Inches of mercury 
0.295 
Millimetres of mercury 
Kilopascals 
0.133 
Kilopascals 
Millimetres of mercury 
7.50 
Inches of water 
Kilopascals 
0.248 
Kilopascals 
Inches of water 
4.03 
Inches of water 
Pounds per square inch 
0.0361 
Pounds per square inch 
Inches of water 
27.69 
Centimetres of water 
Kilopascals 
0.0976 
Kilopascals 
Centimetres of water 
10.2 
Power
To convert: 
to: 
multiply by: 
Horsepower 
Kilowatts 
0.746 
Kilowatts 
Horsepower 
1.34 
PS (Pferdestarke) 
Horsepower 
0.986 
Horsepower 
PS (Pferdestarke) 
1.01 
PS (Pferdestarke) 
Kilowatts 
0.735 
Kilowatts 
PS (Pferdestarke) 
1.36 
Torque
To convert: 
to: 
multiply by: 
Footpounds 
Newton metres 
1.36 
Newton metres 
Footpounds 
0.738 
Kilogram metres 
Foot pounds 
7.23 
Foot pounds 
Kilogram metres 
0.138 
Kilogram metres 
Newton metres 
9.81 
Newton metres 
Kilogram metres 
0.102 
Temperature
To convert: 
to: 
: 
Degrees Fahrenheit 
Degrees Celsius 
Subtract 32 and then multiply by 0.556 
Degrees Celsius 
Degrees Fahrenheit 
Multiply by 1.8 and then add 32 
Kelvin 
Degrees Celsius 
Subtract 273.15 
Degrees Celsius 
Kelvin 
Add 273.15 
Fuel Consumption

Divided by: 
Equals: 
282.48 
Miles per English gallon 
Litres per 100 kilometres 
282.48 
Litres per 100 kilometres 
Miles per English gallon 
235.21 
Miles per US gallon 
Litres per 100 kilometres 
235.21 
Litres per 100 kilometres 
Miles per US gallon 
Miscellaneous
To convert: 
to: 
multiply by: 
Pounds per inch 
Newtons per millimetre 
0.175 
Newtons per millimetre 
Pounds per inch 
5.71 
Kilograms per millimetre 
Pound per inch 
56.0 
Pounds per inch 
Kilograms per millimetre 
0.0179 
Metres per second, per second 
g 
0.102 
g 
Metres per second, per second 
9.81 
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