Energy Conversion Calculator
Put energy quantities on the same unit scale before comparing them. Joules and watt-hours describe an amount of energy, not a power rating or a bill. This workflow does not infer appliance efficiency, fuel content or tariffs.
Scope and assumptions
Energy scalar conversions among J, kJ, MJ, Wh and kWh; Wh=3600J. No fuel, food calories, tariff, efficiency or substance assumptions.
Only the directions listed below are supported. Switching units retains your entered amount and validates it against the new direction.
Kilojoules = Joules × 0.001.
Open selected native calculatorKeep and compare a scenario
Scenarios stay in this browser. Share and embed links contain the selected amount; review it before sending.
Worked example
For example, 1 J is 0.001 kJ. Choose the units your own measurement uses.
Available directions
- J → kJ
- J → MJ
- J → Wh
- J → kWh
- kJ → J
- kJ → MJ
- kJ → Wh
- kJ → kWh
- MJ → J
- MJ → kJ
- MJ → Wh
- MJ → kWh
- Wh → J
- Wh → kJ
- Wh → MJ
- Wh → kWh
- kWh → J
- kWh → kJ
- kWh → MJ
- kWh → Wh