Quick answer
100 kJ = 23.901 kcal. Divide 100 by 4.184 to check: 100 ÷ 4.184 = 23.901.
How to convert 100 kJ to calories
- Start with 100 kJ.
- Divide by 4.184: 100 ÷ 4.184 = 23.901 kcal.
- For small calories, use kJ × 1,000 ÷ 4.184: that gives 23,900.6 cal.
You may also see this searched as 100 kj to cal, 100 kj to calorie or 100 kilojoules to calories. All give the same answer. The general method is explained in how to convert kJ to calories.
100 kJ in context
- 1.1% of the 8,700 kJ average-adult reference day on Australian and New Zealand labels.
- 1.2% of a 2,000 kcal reference day, as used on EU and US labels.
- Reference intakes are label conventions. Your own needs depend on age, sex, size and activity. See how many kJ you should eat per day.
Good to know
100 kJ is about 5.88 g of sugar or other carbohydrate (100 ÷ 17), or 2.7 g of fat. Foods are often compared per 100 g, and a food with 100 kJ per 100 g is very low in energy.
Nearby conversions
| Kilojoules | Calories (kcal) |
|---|---|
| 10 kJ | 2.39 kcal |
| 50 kJ | 11.95 kcal |
| 100 kJ | 23.901 kcal |
| 200 kJ | 47.801 kcal |
| 250 kJ | 59.751 kcal |
Browse all popular conversions or the kJ to calories chart.
Frequently asked questions
How many calories is 100 kJ?
100 kJ is 23.901 kcal (food calories). Divide 100 by 4.184 to check.
How many small calories (cal) is 100 kJ?
100 kJ is 23,900.6 cal, since 1 kcal is 1,000 cal.
What percentage of a daily intake is 100 kJ?
About 1.1% of the 8,700 kJ reference day used in Australia and New Zealand, or about 1.2% of a 2,000 kcal reference day.
Last updated 11 Oct 2026. How we calculate.