Quick conversions
| From | Equals |
|---|---|
| 1 kWh | 3,600,000 J |
| 1 kcal | 4,184 J |
| 1 BTU | 1,055.06 J |
Energy Converter
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Convert joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours and BTUs.
Change the value or the units to convert instantly.
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Formula & method
All energies convert through joules: value × (from-factor ÷ to-factor). 1 kcal = 4,184 J; 1 kWh = 3,600,000 J; 1 BTU = 1,055.06 J.
Worked example
1 kWh = 3,600,000 J. 100 kcal = 418,400 J. 1 BTU ≈ 1,055 J.
FAQ
- What is a food calorie?
- A food 'calorie' is actually a kilocalorie: 1 kcal = 1,000 small calories = 4,184 J.
- What is a BTU?
- The energy to raise one pound of water by one degree Fahrenheit — the standard unit for heaters and air conditioners in the US.
- How is a kWh different from a kW?
- kW is power (rate); kWh is energy (power × time). A 1 kW heater running for 1 hour uses 1 kWh.
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