AtlasCalc📏 ConversionbeginnerOffline
Energy Converter
Convert between joules, kilojoules, kWh, calories, BTU.
Inputs
Enter your values below.
Result
Your answer appears here.
Enter values and press Calculate — the result appears here.
How it works
The formula behind this calculator.
1 J = 1 N·m = 1 W·s; 1 kWh = 3.6 MJ; 1 kcal = 4,184 J
- value, from, to
- Source value and unit
Energy and work use the same units (joules). Food Calories are actually kilocalories — capital C = 1,000 small-c calories.
Example: 1 food Calorie (kcal) ≈ 4.184 kJ; 1 BTU ≈ 1,055 J
Ref: SI derived unit for energy (Joule)
Tips
- 💡 1 food Calorie (kcal) = 4,184 joules.
- 💡 Electricity: 1 kWh = 3.6 MJ = 860 kcal. Useful for comparing energy sources.