Quick answer
10 kJ = 2.39 kcal. Divide 10 by 4.184 to check: 10 ÷ 4.184 = 2.39.
How to convert 10 kJ to calories
- Start with 10 kJ.
- Divide by 4.184: 10 ÷ 4.184 = 2.39 kcal.
- For small calories, use kJ × 1,000 ÷ 4.184: that gives 2,390.06 cal.
You may also see this searched as 10 kj to cal, 10 kj to calorie or 10 kilojoules to calories. All give the same answer. The general method is explained in how to convert kJ to calories.
10 kJ in context
- 0.1% of the 8,700 kJ average-adult reference day on Australian and New Zealand labels.
- 0.1% 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
10 kJ is roughly 0.59 g of carbohydrate or protein (10 ÷ 17) or 0.27 g of fat (10 ÷ 37). It is a trace of energy, the sort of amount found in a lick of sugar.
Nearby conversions
Browse all popular conversions or the kJ to calories chart.
Frequently asked questions
How many calories is 10 kJ?
10 kJ is 2.39 kcal (food calories). Divide 10 by 4.184 to check.
How many small calories (cal) is 10 kJ?
10 kJ is 2,390.06 cal, since 1 kcal is 1,000 cal.
What percentage of a daily intake is 10 kJ?
About 0.1% of the 8,700 kJ reference day used in Australia and New Zealand, or about 0.1% of a 2,000 kcal reference day.
Last updated 11 Oct 2026. How we calculate.