Convert energy and mechanical work between joules, calories/kilocalories, watt-hours, BTU, electronvolts, and related units.
The joule (J) is the SI energy unit. All other options are scaled relative to joules using standard conversion factors.
Food “Calories” (capital C) are kilocalories: 1 kcal = 1,000 small calories ≈ 4.184 kJ. Pick kcal/Cal when converting dietary energy.
1 kilowatt-hour equals 3.6 million joules (3.6 MJ) — the common utility billing unit for electricity use.