Energy Converter
Convert between J, kJ, cal, kcal, Wh, kWh, and BTU instantly.
Type in any field and the others update automatically.
Type in any field — the others update instantly.
Energy Conversion uses joules (J) as the base unit.
Key relationships:
1 kJ = 1,000 J1 cal = 4.184 J(thermochemical calorie)1 kcal = 4,184 J(food Calorie)1 Wh = 3,600 J1 kWh = 3,600,000 J1 BTU = 1,055.06 J
Common references:
- A food Calorie (kcal): 4,184 J
- Running a 100W light bulb for 1 hour: 100 Wh = 360,000 J
- Average US household daily electricity: ~30 kWh
- A gallon of gasoline: ~132,000 BTU ≈ ~139 MJ