# Appendix. Useful conversion factors

Length:
 1 centimetre = 0.3937 inches 1 inch = 2.54 centimetres 1 metre = 1.0936 yards = 3.2808 feet = 39.370 inches 1 kilometre = 0.6214 miles 1 mile = 1.6093 kilometres

Area:
 1 hectare = 10 000 square metres = 0.1 square kilometres = 2.471 acres = 11 960 square yards 1 acre = 0.4047 hectares = 4 047 square metres = 4 840 square yards = 43 450 square feet 1 square kilometre = 0.3861 square miles = 100 hectares = 247.1 acres 1 square mile = 2.5898 square kilometres = 254.98 hectares = 640 acres

Volume:
 1 litre = 1 000 millilitres = 61.026 cubic inches = 0.21998 imperial gallons = 0.26418 U.S. gallons 1 imperial gallon = 4.5460 litres = 1.20096 U.S. gallons 1 U.S. gallon = 0.83267 imperial gallons = 3.78528 litres 1 U.S. barrel = 42 U.S. gallons = 34.972 imperial gallons = 0.15899 cubic metres

Energy:
 1 kilowatt = 1.3405 horsepower 1 horsepower = 0.746 kilowatts 1 kilojoule = 0.2389 kilogram calories = 0.948 British thermal units (BTU) = 0.001 megajoules = 0.00027778 kilowatt hours 1 kilowatt hour = 3 412 British thermal units = 1.34 horsepower hours = 3 600 kilojoules = 3.6 megajoules

Prefix table:
 1012 tera T 109 giga G 106 mega M 103 kilo k 102 hecto h 101 deca da

Heating Value: (See conversion factors to calculate values in other units)

 Fuel High Heating Value KJ/Kg Green wood* 15 000 Dry wood* 19 000 Charcoal 31 000 Coke 30 000 Bituminous coal 27 000 Fuel oil 44 000 Kerosene 46 000 wood tar 20 000 Natural gas 45 000 Producer gas 5 000 Wood retort gas 6 000

* Influence of moisture on heating value of wood:
Net heating value (MJ/kg) = 19 000 - 220 M where M is moisture content in percentage of total weight.

 1 cubic metre 1 000 litres = 35.3148 cubic feet = 1.30795 cubic yards = 219.97 imperial gallons = 264.18 U.S. gallons = 6.290 U.S. barrels 1 m³ solid = 750 kg. fuelwood with 40% moisture

Mass:
 1 kilogram = 2.2046-pounds = 1 000 grams 1 pound = 453.592 grams = 0.4536 kilograms 1 ton, English = 2 240 pounds = 1 016.05 kilograms = 1.01605 tonnes (metric tons) = 1.12 U.S. tons = 20 hundred weight (cwt) 1 tonne = 1 000 kilograms = 0.98421 tons (English) = 1.10231 U.S. tons = 2 204.62 pounds 1 U.S. ton = 2 000 pounds = 17.8572 hundred weight (cwt) = 907.184 kilograms = 0.907184 tonnes = 0.89286 tons (English)

Density:

 Bulk density of commercial charcoal = 250 to 300 kilograms per cubic metre Approx. weight of a stacked metre (stere) of: - Plantation grown radiata pine (partly seasoned) = 550 to 650 kilograms - Plantation grown Eucalypt wood (partly seasoned) = 600 to 700 kilograms - Medium density tropical hardwood (partly seasoned) = 700 to 800 kilograms - Dense tropical hardwood = 900 kilograms