Energy Units & Calculator
Energy is an amount. Power is energy per unit time. BTU and calorie conventions must be identified; this page uses International Table values.
Detailed explanation & worked examples
Conversion method
Base value = input × source factor + source offset. Output = (base value − target offset) ÷ target factor. Only units from this family can be converted together.
Worked example
For the first two units below: 1 Joule becomes 0.00100000 Kilojoule.
| Unit | Multiplier | Offset |
|---|---|---|
| Joule | 1 | 0 |
| Kilojoule | 1000 | 0 |
| Megajoule | 1000000 | 0 |
| Watt-hour | 3600 | 0 |
| Kilowatt-hour | 3600000 | 0 |
| BTU (International Table) | 1055.05585262 | 0 |
| Calorie (International Table) | 4.1868 | 0 |
| Kilocalorie (International Table) | 4186.8 | 0 |
Energy is an amount. Power is energy per unit time. BTU and calorie conventions must be identified; this page uses International Table values.
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