Convert energy units including joules, kilojoules, calories, kilocalories, BTU, watt-hours, kilowatt-hours, foot-pounds, electronvolts, and more.
Joules to watt-hours:
1 J = 0.000277778 Wh
Watt-hours to joules:
1 Wh = 3,600 J
Kilowatt-hours to joules:
1 kWh = 3,600,000 J
BTU to joules:
1 BTU = 1055.05585 J
Energy conversions are useful for electrical usage, batteries, heating and cooling, physics, engine output, food energy, thermal systems, and mechanical work.
Use this converter when comparing mechanical, electrical, thermal, and scientific energy units.
Your result shows the entered energy converted from the starting unit into the selected ending unit. The calculator also shows the conversion rate used so you can verify the calculation.
For engineering, electrical, or thermal work, make sure the energy unit matches the formulas, equipment ratings, or usage data you are working with.
Energy is the capacity to do work, produce heat, or cause change in a system.
The SI unit of energy is the joule, abbreviated as J.
One kilowatt-hour equals 3,600,000 joules.
BTU is commonly used for heat energy, heating systems, cooling systems, and HVAC equipment comparisons.
This converter is designed for energy magnitude conversions, so it uses non-negative values.