Energy Measurements and Conversions
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1 Updated September, 2007 File C Energy Measurements and Conversions Don Hofstrand, extension value-added agriculture specialist, co-director Ag Marketing Resource Center, , British thermal unit Joule Electricity Power Liquid Fuels Barrels of petroleum Biomass Natural gas Coal Fuel Usage Deka = ten Hecto = hundred Kilo = thousand Mega = million Giga = billion Tera = trillion British thermal unit (Btu) measurements and conversions Approximate definition: A British thermal unit is defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit (Wikipedia). 1 British thermal unit (Btu) = 252 International Table calories 1 calorie = Btus 1 Btu = 1,055 joules 1 Btu = kilojoules 1 kilojoule =.9479 Btus 1 therm = 100,000 Btus 1 dekatherm = 10 therms 1 dekatherm = 1,000,000 Btus 1 kilowatt hour of electricity = 3,412 Btu 1 horsepower = 2,545 Btu per hour Convertit: Energy Information Administration: Energy and Work Conversion Unit Converter: Joule measurements and conversions Approximate Definition: the energy required to lift a small apple (102g) one meter against Earth's gravity (Wikipedia). 1 joule = Btus 1 Btu = 1, joules 1 kilojoule = one thousand joules 1 kilojoule = Btus 1 Btu = kilojoules 1 watt hour = 3,600 joules 1 kilowatt hour = 3.6 megajoules
2 1 megajoule = one million joules 1 terajoule = one million megajoules Online conversions: Convertit.com: Energy and Work Conversion Unit Converter: Electricity measurements and conversions Watt Approximate definition: A human climbing a flight of stairs is doing work at the rate of about 200 watts (Wikipedia). 1 watt = 1 joule per second 1 watt = Btu per hour 1 Btu per hour =.293 watts 1 kilowatt (kw) = one thousand watts 1 kilowatt = 3,412 Btu per hour 1 kilowatt = horsepower 1 horsepower =.746 kilowatts 1 megawatt (MW) = one million watts 1 gigawatt (GW) = one billion watts 1 terawatt (TW) = one trillion watts 1 gigawatt = one million kilowatts Watt hours Approximate definition: One watt-hour is the amount of (usually electrical) energy expended by a one-watt load (e.g., light bulb) drawing power for one hour (Wikipedia). 1 watt second = 1 joule 1 watt minute = 60 joules 1 watt hour (Wh) = 3,600 joules 1 watt hour = 3.6 kilojoules 1 kilowatt hour = one thousand watt hours 1 kilowatt hour (kwh) = 3.6 megajoules 1 megajoule =.278 kilowatt hours 1 kilowatt hour = 3,412 Btus 1 kilowatt hour = 1.34 horsepower hours 1 horsepower hour =.746 kilowatt hours 1 megawatt hour (MWh) = one million watt hours 1 gigawatt hour (GWh) = one billion watt hours 1 terawatt hour (TWh) = one trillion watt hours 1 gigawatt hour = one million kilowatt hours 1 terawatt hour = one billion kilowatt hours 1 terawatt hour = one million megawatt hours Online conversions: Convertit.com: Energy Information Administration: Energy and Work Conversion Unit Converter: Power measurements and conversions 1 Btu per second =.9478 kilowatts 1 Btu per second =.7068 horsepower
3 1 Btu per second =.6971 metric horsepower 1 Btu per second = kilocalories per second 1 kilowatt = Btu per second 1 kilowatt =.7457 horsepower 1 kilowatt =.7355 metric horsepower 1 kilowatt = kilocalories per second 1 horsepower = kilowatts 1 horsepower =.9863 metric horsepower 1 horsepower = kilocalories per second 1 horsepower = Btu per second 1 metric horsepower = horsepower 1 metric horsepower = kilowatts 1 metric horsepower = kilocalories per second 1 metric horsepower = Btu per second Biomass Energy Data Book, U.S. Department of Energy: Power Conversion Unit Converter: Online Power Conversion: Energy and Work Conversion Unit Converter: Liquid fuel measurements and conversions Gasoline 1 gallon = 125,000 Btu HHV * 1 gallon = megajoules HHV * 1 gallon = 115,400 Btu LHV * 1 gallon = megajoules LHV * 1 gallon = metric tons 1 barrel = 5,250,000 Btu HHV * 1 barrel = 5,539 megajoules HHV * 1 barrel = 4,846,800 Btu LHV * 1 barrel = 5,113 megajoules LHV * 1 barrel =.1172 metric tons 1 liter = 33,025 Btu HHV * 1 liter = 34.8 megajoules HHV * 1 liter = 30,489 Btu LHV * 1 liter = 32.2 megajoules LHV * Diesel fuel 1 gallon = 138,700 Btu HHV * 1 gallon = megajoules HHV * 1 gallon = 128,700 Btu LHV * 1 gallon = megajoules HHV * 1 gallon = metric tons 1 barrel = 5,825,400 Btu HHV * 1 barrel = 6,146 megajoules HHV * 1 barrel = 5,405,400 Btu LHV * 1 barrel = 5,703 megajoules LHV * 1 barrel =.1341 metric tons 1 liter = 36,645 Btu HHV * 1 liter = 38.7 megajoules HHV * 1 liter = 34,003 Btu LHV * 1 liter = 35.9 megajoules LHV * Ethanol 1 gallon = 84,600 Btu HHV * 1 gallon = 89.3 megajoules HHV *
4 1 gallon = 75,670 Btu LHV * 1 gallon = 79.8 megajoules LHV * 1 barrel = 3,553,200 Btu HHV * 1 barrel = 3,749 megajoules -- HHV * 1 barrel = 3,178,140 Btu LHV * 1 barrel = 3,353 megajoules LHV * 1 liter = 22,351 Btu HHV * 1 liter = 23.6 megajoules HHV * 1 liter = Btu LHV * 1 liter = 21.1 megajoules LHV * Ethanol average density =.79 grams per milliliter Ethanol average density =.79 metric tons per cubic meter Bio-diesel 1 gallon = 126,206 Btu HHV * 1 gallon = megajoules HHV * 1 gallon = 117,093 Btu LHV * 1 gallon = megajoules LHV * 1 barrel = 5,300,652 Btu HHV * 1 barrel = 5,592 megajoules HHV * 1 barrel = 4,917,906 Btu LHV * 1 barrel = 5,188 megajoules LHV * 1 liter = 33,344 Btu HHV * 1 liter = 35.2 megajoules HHV * 1 liter = 30,936 Btu LHV * 1 liter = 32.6 megajoules LHV * 1 metric ton of biodiesel = 37.8 gigajoules Bio-diesel average density =.88 grams per milliliter Bio-diesel average density =.88 metric tons per cubic meter Residual Fuel 1 gallon = 149,700 Btu HHV * 1 gallon = megajoules HHV * 1 gallon = 138,400 Btu LHV * 1 gallon = megajoules LHV * 1 barrel = 6,287,400 Btu HHV * 1 barrel = 6,633 megajoules HHV * 1 barrel = 5,812,800 Btu LHV * 1 barrel = 6,133 megajoules LHV * 1 liter = 39,551 Btu HHV * 1 liter = 41.7 megajoules HHV * 1 liter = 36,565 Btu LHV * 1 liter = 38.6 megajoules LHV * LP Gas (liquefied petroleum gas propane) 1 gallon = 91,300 Btu HHV * 1 gallon = 96.3 megajoules HHV * 1 gallon = 83,500 Btu LHV * 1 gallon = 88.1 megajoules LHV * 1 barrel = 3,834,600 Btu HHV * 1 barrel = 4,046 megajoules HHV * 1 barrel = 3,507,000 Btu LHV * 1 barrel = 3,700 megajoules LHV * 1 liter = 24,121 Btu HHV * 1 liter = 25.4 megajoules HHV * 1 liter = 22,061 Btu LHV * 1 liter = 23.3 megajoules LHV *
5 Methanol 1 gallon = 64,600 Btu HHV * 1 gallon = 68.2 megajoules HHV * 1 gallon = 56,560 Btu LHV * 1 gallon = 59.7 megajoules LHV * 1 barrel = 2,713,200 Btu HHV * 1 barrel = 2,862 megajoules HHV * 1 barrel = 2,375,520 Btu -- LHV * 1 barrel = 2,506 megajoules LHV * 1 liter = 17,067 Btu HHV * 1 liter = 18.0 megajoules HHV * 1 liter = 14,943 Btu LHV * 1 liter = 15.8 megajoules LHV * Butane 1 gallon = 103,000 Btu HHV * 1 gallon = megajoules HHV * 1 gallon = 93,000 Btu LHV * 1 gallon = 98.1 megajoules LHV * 1 barrel = 4,326,000 Btu HHV * 1 barrel = 4,564 megajoules HHV * 1 barrel = 3,906,000 Btu -- LHV * 1 barrel = 4,121 megajoules LHV * 1 liter = 27,213 Btu HHV * 1 liter = 28.7 megajoules HHV * 1 liter = 24,571 Btu LHV * 1 liter = 25.9 megajoules LHV * Biomass Energy Data Book, U.S. Department of Energy: Barrels of petroleum or related products (bbl) measurements and conversions Crude Oil 1 barrel = 42 gallons 1 drum = 55 gallons 1 metric drum = 52.8 gallon 1 gallon =.0182 drum 1 gallon =.0189 metric drum 1 gallon = 138,100 Btu HHV * 1 gallon = megajoules HHV * 1 gallon = 131,800 Btu LHV * 1 gallon = megajoules LHV * 1 gallon = metric tons 1 barrel = 5,800,200 Btu HHV * 1 barrel = 6,119 megajoules HHV * 1 barrel = 5,535,600 Btu LHV * 1 barrel = 5,840 megajoules LHV * 1 barrel = metric tons 1 liter = 36,486 Btu HHV * 1 liter = 38.5 megajoules HHV * 1 liter = 34,822 Btu LHV * 1 liter = 36.7 megajoules LHV * 1 barrel of crude oil = gallons of petroleum products Gallons Percent Finished motor gasoline Distillate fuel oil
6 Kero-type jet fuel Petroleum coke Still gas Residual fuel oil Liquefied refiner gas Asphalt and road oil Other Refined petroleum products 1 metric ton motor gasoline = 8.53 barrels 1 metric ton LP-gas (liquefied petroleum gas) (propane) = 11.6 barrels 1 metric ton natural gas = 10 barrels 1 metric ton NGL (natural gas liquids) = 10.4 barrels Liquid fuels 1 cubic meter = barrels 1 barrel = 159 liters 1 barrel = 42 US gallons 1 U.S. gallon = 231 cubic inches 1 U.S. gallon =.1337 cubic feet 1 U.S. gallon = liters 1 U.S. gallon =.8321 imperial gallons 1 U.S. gallon =.0238 barrels 1 U.S. gallon = cubic meters 1 liter = cubic inches 1 liter = cubic feet 1 liter =.2642 U.S. gallons 1 liter =.22 imperial gallons 1 liter = barrels 1 liter =.001 cubic meters Flow Rate 1 barrel per hour = cubic feet per day 1 barrel per hour = 49,187 cubic feet per year 1 barrel per hour = 1,008 U.S. gallons per day 1 barrel per hour = 367,920 U.S. gallons per year 1 barrel per hour = imperial gallons per day 1 barrel per hour = 306,345 imperial gallons per year 1 barrel per hour = 3,815 liters per day 1 barrel per hour = 1,392,475 liters per year 1 gallon per hour =.5712 barrels per day 1 gallon per hour = barrels per year 1 liter per hour =.1510 barrels per day 1 liter per hour = barrels per year Biomass Energy Databook, U.S. Department of Energy: Biomass measurements and conversions 1 pound of switchgrass = 7,341 Btu 1 pound of bagasse = 6,065 Btu 1 pound of rice hulls = 6,575 Btu 1 pound of poultry litter = 6,187 Btu 1 cord of stacked wood = 4 feet x 4 feet x 8 feet 1 cord of stacked wood = 128 cubic feet 1 cord of stacked wood weighs about 1.2 short tons
7 1 cord of stacked wood weighs about 1,090 kilograms 1 metric ton of wood = 1.4 cubic meters (solid wood) 1 ton of wood fuel (bone dry) = 18 to 22 gigajoules HHV * 1 pound of wood fuel (bone dry) = 7,600 to 9,600 Btu HHV * 1 ton of wood fuel (air dry 20% moist.) = about 15 gigajoules 1 pound of wood fuel (air dry 20% moist.) = about 6,400 Btu 1 ton of agricultural residue (varying moist.) = 10 to 17 gigajoules 1 pound of agricultural residue (varying moist.) = 4,300 to 7,300 Btu 1 metric ton of charcoal = 30 gigajoules 1 pound of charcoal = 12,800 Btus Bioenergy Feedstock Information Network: Biomass Energy Databook, U.S. Department of Energy: Natural gas measurements and conversions 1 cubic foot wet = 1,109 Btu 1 cubic foot dry = 1,027 Btu 1 cubic foot dry = 1,087 kilojoules 1 cubic foot compressed = 960 Btu 1 pound = 20,551 Btu 1 gallon liquid = 90,800 Btu HHV * 1 gallon liquid = 87,600 Btu LHV * 1 million cubic feet = 1,027,000 Btu 1 metric ton liquefied natural gas (LNG) = 48,700 cubic feet of natural gas 1 short ton = 53, cubic feet 1 long ton = 60, cubic feet 1 cubic foot = cubic meters 1 cubic meter dry = 36,409 Btu 1 cubic meter dry = megajoules 1 cubic meter = cubic feet Energy Information Administration: Biomass Energy Databook, U.S. Department of Energy: Coal measurements and conversions 1 pound = 10,377 Btu 1 pound of coal = megajoules 1 short ton (2,000 lbs.) of coal = 20,754,000 Btu 1 short ton = 21,897 megajoules 1 short ton =.907 metric tons 1 metric ton = 22,877,388 Btu 1 metric ton = 24,137 megajoules 1 metric ton = short tons Energy Information Administration: Measurement Converter:
8 Fuel usage measurements and conversions 1 mile per gallon =.264 miles per liter 1 mile per gallon =.425 kilometers per liter 1 mile per gallon = 235 liters per 100 kilometers 1 mile per gallon = 100 gallons per 100 miles 1 mile per liter = 3.79 miles per gallon 1 mile per liter = kilometers per liter 1 mile per liter = liters per 100 kilometers 1 kilometer per liter = 2.35 miles per gallon 1 kilometer per liter =.6215 miles per liter 1 kilometer per liter = 100 liters per 100 kilometers 1 kilometer per liter = 42.5 gallons per 100 miles Biomass Energy Data Book, U.S. Department of Energy: Fuel Consumption Converter Unit Converter: * Energy contents are expressed as either High (gross) Heating Value (HHV) or Lower (net) Heating Value (LHV). LHV is closest to the actual energy yield in most cases. HHV (including condensation of combustion products) is greater by between 5% (in the case of coal) and 10% (for natural gas), depending mainly on the hydrogen content of the fuel. For most biomass feed-stocks this difference appears to be 6-7%. The appropriateness of using LHV or HHV when comparing fuels, calculating thermal efficiencies, etc. really depends upon the application. For stationary combustion where exhaust gases are cooled before discharging (e.g. power stations), HHV is more appropriate. Where no attempt is made to extract useful work from hot exhaust gases (e.g. motor vehicles), the LHV is more suitable. In practice, many European publications report LHV, whereas North American publications use HHV (Source: Bioenergy Feedstock Network -- References: Energy Kids Page, Energy Information Administration, ( Energy Information Administration, ( Wikipedia, ( Measurement Converter, Convertit.com, ( Bioenergy Feedstock Information Network, ( Iowa Energy Center, Iowa State University, ( Biomass Energy Datebook, U.S. Department of Energy, () Ag Decision Maker Home Page
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