joule
J
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energy
Energy Conversions
Convert energy units including joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, BTU, electronvolts, and therms.
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Common Questions
Is a food Calorie different from a calorie?
Yes. A food Calorie is a kilocalorie, so 1 Calorie equals 1000 small calories.
What is a watt-hour?
A watt-hour is energy from using one watt of power for one hour. It equals 3600 joules.
Which BTU definition is used?
Energy conversions use the International Table BTU as noted in the category assumptions.
Show all 9 units
joule
J
kilojoule
kJ
calorie
cal
kilocalorie
kcal, Cal
watt-hour
Wh
kilowatt-hour
kWh
British thermal unit
BTU
electronvolt
eV
therm
thm
Area
9 units ready
Data Storage
10 units ready
Energy
9 units ready
Length & Distance
8 units ready
Power
8 units ready
Pressure
8 units ready
Speed
5 units ready
Temperature
3 units ready
Volume
9 units ready
Weight and Mass
6 units ready