kJ to Calories Converter
Convert between kilojoules (kJ), Calories (kcal), and small calories (cal). Nutrition labels in EU/Australia use kJ, while the US uses kcal.
Quick Reference
| kJ | kcal | Common context |
|---|---|---|
| 418.4 | 100 | Medium apple |
| 1,046 | 250 | Grilled chicken breast (100g) |
| 1,674 | 400 | Cheeseburger |
| 2,092 | 500 | Large fries |
| 4,184 | 1,000 | 1 bagel with cream cheese |
| 8,368 | 2,000 | Typical daily intake |
How kilojoules and Calories relate
1 Calorie (kcal) = 4.184 kJ. 1 kJ = 0.239 Cal. Calorie = kilocalorie (capital C). Carbs/protein = 4 Cal/g. Fat = 9 Cal/g. Alcohol = 7 Cal/g. AU/NZ use kJ, North America uses Cal.
Frequently asked questions
How accurate are the results?
Formulas used here are validated in population studies but cannot account for individual genetics, body composition, or medical conditions. Treat results as a starting point, not a medical diagnosis.
Should I consult a professional?
If you have specific health concerns, existing conditions, or are planning significant lifestyle changes, consult a qualified healthcare provider (doctor, dietitian, physiologist).
How often should I recalculate?
Recalculate when your weight changes more than 5%, activity level shifts significantly, or every 3-6 months for routine monitoring. Results are snapshots — your body changes daily.
Last updated
For general wellness information only, not medical advice — see our disclaimer.