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Energy Unit Converter
Convert joules, watt-hours, and kilowatt-hours in one step.
How to Use This Tool
Learn More About Energy Unit Converter
Energy vs power
- Energy (this tool) is stored or delivered work: joules or watt-hours.
- Power is energy per time (watts). Use the Power Converter for W, kW, hp.
1 Wh = 3600 J exactly.
About
Convert energy between joules (J), kilojoules, megajoules, watt-hours (Wh), and kilowatt-hours (kWh). Useful for electricity bills, battery specs, and physics problems. Math comes from the convert package.
Examples
One kilowatt-hour
Utility-style kWh expressed in joules and related units.
Input
1 kWh
Output
J: 3600000.000000 kJ: 3600.000000 MJ: 3.600000 Wh: 1000.000000 kWh: 1.000000
3,600 joules
Exactly one watt-hour from joules.
Input
3600 J
Output
J: 3600.000000 kJ: 3.600000 MJ: 0.003600 Wh: 1.000000 kWh: 0.001000
Use Cases
- Relating kWh on a utility bill to joules
- Sizing battery energy in Wh vs MJ
- Homework and lab unit checks