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Kilojoules to Calories
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Kilojoules to Calories — quick reference

1 kj = 0.239 kcal
Common Kilojoules to Calories conversions
kj kcal
1 kj 0.239 kcal
2 kj 0.478 kcal
3 kj 0.717 kcal
5 kj 1.195 kcal
10 kj 2.3901 kcal
20 kj 4.7801 kcal
25 kj 5.9751 kcal
50 kj 11.9503 kcal
100 kj 23.9006 kcal
250 kj 59.7514 kcal
500 kj 119.5029 kcal
1000 kj 239.0057 kcal
// about this tool

Kilojoules to Calories Online

Updated 2026-10-24

Convert kilojoules to Calories online for free. Enter an energy value in kJ and SnapTools shows the exact value in (dietary) Calories instantly, in your browser. Nothing is uploaded.

Many nutrition labels (EU, Australia, and others) list energy only in kilojoules, but US and UK Calorie-counters need the more familiar unit. This tool converts to dietary Calories (kilocalories), not the much smaller chemistry "calorie", using the exact 0.2390057361 factor. For the full family of energy units (joules, watt-hours, BTU), use the Energy Converter.

// how to use

  1. 1 Type or paste an energy value in kilojoules into the input.
  2. 2 SnapTools converts it to (dietary) Calories as you type.
  3. 3 Copy the result, or use the slider for a quick scrub across common food-label values.

// examples

A common daily energy target
Input
8368
Output
2000 kcal
A 500 kJ snack
Input
500
Output
119.5029 kcal

// common uses

Converting a kJ-labelled food product's energy to Calories Checking a kJ-based fitness target against a Calorie-counting app Comparing nutrition labels between regions Checking a manual energy conversion

// faq

Is 1 calorie always exactly 4.184 joules?
Almost, but there are actually two slightly different calorie definitions. The thermochemical calorie used here is exactly 4.184 joules; the older "International Table" calorie, created in 1956 for steam-engineering tables, is 4.1868 joules. The difference (0.0028 J) is negligible for food or fitness use, but shows up in precise scientific work.
Does "Calories" here mean kilocalories?
Yes, the result is dietary Calories (kcal), the unit US and UK food labels use, not the much smaller chemistry "calorie" (1/1000th the size).
Why would I need to convert kJ to Calories?
Many countries require kilojoules on nutrition labels, but if you're used to counting Calories (US/UK style), converting the kJ figure back gives you the number you're familiar with.
What's the exact conversion factor?
1 kilojoule is exactly 0.2390057361 kilocalories (dietary Calories), the reciprocal of the exact 4.184 kJ per kcal.
What about converting Calories back to kilojoules?
Use Calories to Kilojoules, or the full Energy Converter for joules, watt-hours, and BTU.

// works with your data

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Use this via API

Get a free API key → 
curl -X POST https://thesnaptools.com/api/v1/tools/kilojoules-to-calories \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"value":"8368"}'