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What Is Energy?

Energy Calculators

Energy Ant

From gallons to British thermal units (Btu), kilowatthours to megajoules, short tons to metric tons — this handy calculator converts from one energy unit to another.

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Calculators for Energy Used in the United States


Coal conversion calculator

short tons

Btu

megajoules

metric tons

1 short ton = 19,146,000 Btu (based on U.S. electric power sector consumption, 2015)

Electricity conversion calculator

kilowatthours

Btu

megajoules

million calories

1 kilowatthour = 3,412 Btu (standard conversion factor)

Natural gas conversion calculator

cubic feet

Btu

megajoules

cubic meters

1 cubic foot = 1,037 Btu (based on U.S. end-use sector consumption, 2015)

Crude oil conversion calculator

barrels

Btu

megajoules

liters

1 barrel = 42 U.S. gallons = 5,717,000 Btu (based on U.S. production, 2015)

Gasoline conversion calculator

gallons

Btu

megajoules

liters

1 gallon = 120,476 Btu (based on U.S. finished motor gasoline consumption, 2015)

Diesel fuel conversion calculator

gallons

Btu

megajoules

liters

1 gallon = 137,452 Btu (based on U.S. consumption, 2015)

Measuring energy in food

Food calories are a measure of energy in food. One food calorie is equal to 1,000 calories, or 1 kilocalorie. For example, the energy in a 300-food calorie ice cream cone is about the same as the amount of electricity required to light a 100-watt incandescent light bulb for 3½ hours.

Food energy calculator

food calories

Btu

megajoules

kilowatthours

1 food calorie = 1,000 calories, or 1 kilocalorie, or 3.9683 Btu

Scientific notation explained

Scientific notation is a short-hand way of writing a number that has a lot of digits. For example, the number 525,000,000 could be written as 5.25E+08. The "+08" indicates the decimal should be moved eight places to the right. A negative number after the "E" means the decimal should be moved a certain number of places to the left. For example, 5.25E-03 is the same as 0.00525.

Common energy units:
(Scientific notation)

British thermal unit (Btu)

1.0

Millions of Btu

1.0E+06 Btu

Therm

1.0E+05 Btu

Billions of Btu

1.0E+09 Btu

Quad

1.0E+15 Btu

   

Calorie

1.0 Calorie

Kilocalorie

1.0E+03 Calories

Food calorie

1.0E+03 Calories

Thermie

1.0E+05 Calories

Teracalorie

1.0E+12 Calories

   

Megajoule

1.0E+06 Joule

Joule

1.0 Joule

Gigajoule

1.0E+09 Joules

Terajoule

1.0E+12 Joules

   

Watthour

1.0

Kilowatthour (kWh)

1.0E+03 watthour

Megawatthour (mWh)

1.0E+06 watthour

Gigawatthour (gWh)

1.0E+09 watthour

Terawatthour (tWh)

1.0E+12 watthour