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Energy conversions are useful for electricity bills (kilowatt-hours), nutrition labels (calories), and physics (joules and electronvolts).
The kilowatt-hour (kWh) is the reference for electricity bills, the calorie and kilocalorie for nutrition labels, and the joule or BTU in physics and air conditioning. Here is a conversion table for the most searched values:
| Unit | Joule |
|---|---|
| 1 calorie | 4.184 J |
| 1 kilocalorie | 4,184 J |
| 1 watt-hour | 3,600 J |
| 1 kilowatt-hour | 3,600,000 J |
| 1 BTU | 1,055.06 J |
For a precise value not listed here, use the converter above.