Popular conversions
1 pairsJoule ↔ Kilowatt-hour
J ↔ kWh
Unit guides
2 unitsEnergy and Power calculators
2 toolsDetailed guide to Energy and Power
Energy measures an amount of work or heat, distinct from power, which measures the rate energy is transferred (see the separate Power category).
This category groups practical energy conversions often needed in building systems, electricity billing and heat calculations.
- Physical quantity
- Energy
- SI unit
- Joule
- Common billing unit
- Kilowatt-hour
- Typical use
- Electrical consumption and heat content
What is energy?
Energy measures an amount of work or heat stored or transferred, not the rate at which it happens.
A kilowatt-hour is an energy unit; the related power unit (kilowatt) has its own conversion category.
Joules, kilowatt-hours, calories and BTU
The joule is the SI unit of energy. Kilowatt-hours are widely used on electricity bills, while calories and BTU are common in nutrition and heating contexts.
Energy and power units
| Unit | Symbol | Information |
|---|---|---|
| Joule | J | View unit guide |
| Kilowatt-hour | kWh | View unit guide |
Sources
The definitions and conversion relationships on this page are aligned with standard metrology and SI reference material.