Last updated: September 16, 2026
Quick answer: Divide kilojoules by 4.184 to get food calories (kcal). 1 kJ = 0.239 kcal. So 1,000 kJ = 239 kcal, 2,092 kJ = 500 kcal, and the standard 8,700 kJ daily reference = approximately 2,079 kcal. To go the other way, see our calories to kJ converter.
Kilojoule to Kilocalorie
Instantly convert kilojoule to kilocalorie with fast, accurate, real-time results.
Formula: kilojoules to calories
To convert kJ to food calories (kcal), divide by 4.184. This is the exact thermochemical conversion — one kilocalorie is defined as 4.184 kilojoules.
Examples:
- 418 kJ ÷ 4.184 = 99.9 kcal ≈ 100 kcal (a small apple)
- 1,046 kJ ÷ 4.184 = 250 kcal (a light snack or small yoghurt)
- 2,510 kJ ÷ 4.184 = 600 kcal (a medium restaurant main)
- 8,368 kJ ÷ 4.184 = 2,000 kcal (US reference daily intake)
Reading Australian and EU food labels (kJ)
If you've picked up food in Australia, New Zealand, or parts of Europe and seen only "kJ" on the nutrition panel — this section explains how to make sense of it in familiar calorie terms.
Australia and New Zealand label format
Under Food Standards Australia New Zealand (FSANZ), all packaged food must display energy in kilojoules (kJ). Since 2012, kcal are optional but rarely shown. The daily reference value is 8,700 kJ per day.
| kJ (label) | = kcal (Calories) | % of 8,700 kJ day |
|---|---|---|
| 200 kJ | 47.8 kcal | 2.3% |
| 400 kJ | 95.6 kcal | 4.6% |
| 630 kJ | 150.6 kcal | 7.2% |
| 840 kJ | 200.8 kcal | 9.7% |
| 1,000 kJ | 239.0 kcal | 11.5% |
| 1,255 kJ | 300.0 kcal | 14.4% |
| 1,700 kJ | 406.4 kcal | 19.5% |
| 2,100 kJ | 501.9 kcal | 24.1% |
| 2,500 kJ | 597.6 kcal | 28.7% |
| 3,000 kJ | 717.1 kcal | 34.5% |
European Union label format
EU Regulation 1169/2011 requires both kJ and kcal to be shown on nutrition labels, in that order (e.g. "1,046 kJ / 250 kcal"). UK labels follow the same format post-Brexit. The EU reference intake is 2,000 kcal (8,400 kJ) per day.
Common drinks and snacks in kJ and kcal
| Item | Serving | kJ | kcal |
|---|---|---|---|
| Water | Any | 0 kJ | 0 kcal |
| Black coffee | 250 mL | 8 kJ | 2 kcal |
| Diet cola | 375 mL can | 5–10 kJ | 1–2 kcal |
| Orange juice (fresh) | 250 mL | 460 kJ | 110 kcal |
| Full-cream milk | 250 mL | 670 kJ | 160 kcal |
| Regular cola | 375 mL can | 635 kJ | 152 kcal |
| Energy drink (standard) | 250 mL | 450 kJ | 108 kcal |
| Beer (mid-strength) | 375 mL | 540 kJ | 129 kcal |
| Glass of red wine | 150 mL | 510 kJ | 122 kcal |
| Flat white coffee (full milk) | 200 mL | 540 kJ | 129 kcal |
| Greek yoghurt (plain) | 200 g | 640 kJ | 153 kcal |
| Chocolate biscuit (1 piece) | 20 g | 400 kJ | 96 kcal |
| Packet of chips / crisps (small) | 27 g | 600 kJ | 143 kcal |
| Muffin (blueberry, large) | 113 g | 1,600 kJ | 382 kcal |
Daily intake: 8,700 kJ explained
Australia uses 8,700 kJ as its standard reference daily intake — equivalent to about 2,079 kcal. The US uses 2,000 kcal (8,368 kJ). These are population reference values for labeling purposes, not individual recommendations. Your actual needs depend on age, sex, weight, height, and activity level.
| Daily target (kJ) | = kcal | Used by |
|---|---|---|
| 8,400 kJ | 2,009 kcal | EU and UK food label reference |
| 8,368 kJ | 2,000 kcal | US food label reference (2,000 Cal) |
| 8,700 kJ | 2,079 kcal | Australia and New Zealand (FSANZ) |
| 6,000–7,000 kJ | 1,434–1,673 kcal | Typical weight-loss calorie range (adult women) |
| 7,000–8,700 kJ | 1,673–2,079 kcal | Typical weight-loss calorie range (adult men) |
| 10,000–12,000 kJ | 2,390–2,868 kcal | Active adult men (maintenance) |
kJ to calories conversion table
| Kilojoules (kJ) | Calories (kcal) | Kilojoules (kJ) | Calories (kcal) |
|---|---|---|---|
| 100 kJ | 23.9 kcal | 2,500 kJ | 597.6 kcal |
| 200 kJ | 47.8 kcal | 3,000 kJ | 717.1 kcal |
| 400 kJ | 95.6 kcal | 3,500 kJ | 836.6 kcal |
| 500 kJ | 119.5 kcal | 4,000 kJ | 956.1 kcal |
| 630 kJ | 150.6 kcal | 4,184 kJ | 1,000 kcal |
| 800 kJ | 191.3 kcal | 5,000 kJ | 1,195.2 kcal |
| 1,000 kJ | 239.0 kcal | 6,000 kJ | 1,434.2 kcal |
| 1,200 kJ | 286.8 kcal | 7,000 kJ | 1,673.3 kcal |
| 1,500 kJ | 358.5 kcal | 8,000 kJ | 1,912.3 kcal |
| 1,700 kJ | 406.4 kcal | 8,368 kJ | 2,000.0 kcal |
| 2,000 kJ | 478.1 kcal | 8,700 kJ | 2,079.3 kcal |
| 2,092 kJ | 500.0 kcal | 10,000 kJ | 2,390.4 kcal |
Frequently asked questions
How many calories is 1,000 kJ?
1,000 kJ ÷ 4.184 = 239.0 kcal. This is roughly the energy in a medium banana plus an apple, or a small bowl of oatmeal with water. As a percentage of a 2,000 kcal day, it's about 12%.
Is 8,700 kJ a day enough?
8,700 kJ = approximately 2,079 kcal. This is the Australian/NZ reference daily intake — a population average for adults, not a prescription. Whether it's "enough" depends entirely on your body size, age, sex, and activity level. Sedentary smaller adults may need only 6,000–7,000 kJ; active larger adults may need 10,000–13,000 kJ. A dietitian can give you a personalised target.
What is 2,000 kJ in calories?
2,000 kJ ÷ 4.184 = 478 kcal. That's roughly the energy in a medium-sized meal or a large fast-food burger. It represents about 23% of the Australian 8,700 kJ reference day, or about 24% of the 2,000 kcal US reference.
Are kilojoules the same as calories?
No — they're different units measuring the same thing (energy). 1 kcal (food calorie) = 4.184 kJ. Kilojoules are larger: the same food has a numerically higher kJ count than kcal count, by a factor of about 4.2. A 250-calorie snack would be labeled as "1,046 kJ" in Australia.
Why do some labels show both kJ and kcal?
EU Regulation 1169/2011 requires both, in the format "X kJ / Y kcal." It helps consumers cross-reference between the metric system (kJ, used by scientists worldwide) and the traditional dietary unit (kcal) they may be familiar with. Australia shows kJ only; the US shows kcal ("Calories") only.
How many kJ should I eat to lose weight?
A general guideline is to create a deficit of 2,000–2,500 kJ (roughly 500–600 kcal) per day to lose approximately 0.5 kg per week. However, this varies significantly by individual — safe, sustainable weight loss should be guided by a doctor or accredited practising dietitian (APD), especially if you have any health conditions.
Sources and references
- Food Standards Australia New Zealand (FSANZ). Energy calculation and food labelling. FSANZ, 2020.
- European Commission. Regulation (EU) No 1169/2011 on the provision of food information to consumers. Official Journal of the EU.
- U.S. Food and Drug Administration (FDA). Daily Value on the New Nutrition and Supplement Facts Labels. FDA, 2020.
- National Health and Medical Research Council (NHMRC). Australian Dietary Guidelines. NHMRC, 2013.
- Bureau International des Poids et Mesures (BIPM). The International System of Units (SI), 9th edition, 2019.
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