Common values
- 1 kcal (food cal) = 4.184 kJ
- 1 kWh = 3.6 MJ = 3412 BTU
- 1 BTU = 1055 J ≈ heat to raise 1 lb of water by 1 °F
- 1 eV = 1.602 × 10⁻¹⁹ J (atomic-scale energy)
FAQ
Calorie vs kilocalorie?
The "Calorie" on food labels is actually the kilocalorie (1000 small calories). 1 food Cal = 1 kcal = 4.184 kJ.