- kcal to kJ converterConvert kilocalories (kcal) to kilojoules (kJ). Multiply by 4.184.
- Joules to caloriesConvert joules (J) to calories. Divide by 4.184 for small calories, or by 4,184 for kilocalories.
- Calories to joulesConvert calories to joules (J). Multiply small calories by 4.184, or kilocalories by 4,184.
- Daily energy calculatorEstimate how much energy your body uses in a day. Results appear in kilojoules and calories.
Last updated 11 Oct 2026. How we calculate.