Kilocalories to megajoules converter
Convert kilocalories to megajoules with an editable calculator, worked example, formula and reference table. Check the unit definitions before you convert.
Updated · How we checkUse a decimal point, such as 2.5. Enter a value in kcal th; the result is in MJ.
Formula
Worked example
Convert 100 kcal th to MJ:
100 kcal th ≈ 0.4184 MJ
Multiply your kcal th value by the factor above. The calculator uses the full conversion factor before rounding the displayed answer.
Kilocalories to megajoules table
Reference values rounded to 10 significant digits. Use the converter above for other amounts.
| Kilocalories (kcal th) | Megajoules (MJ) |
|---|---|
| 0.1 | ≈ 0.0004184 |
| 0.5 | ≈ 0.002092 |
| 1 | ≈ 0.004184 |
| 2 | ≈ 0.008368 |
| 5 | ≈ 0.02092 |
| 10 | ≈ 0.04184 |
| 25 | ≈ 0.1046 |
| 50 | ≈ 0.2092 |
| 100 | ≈ 0.4184 |
| 1000 | ≈ 4.184 |
Understanding kilocalories
This converter uses the thermochemical kilocalorie: exactly 4,184 joules. A kilocalorie is 1,000 small thermochemical calories; other historical calorie definitions differ.
Understanding megajoules
One megajoule equals one million joules or 1,000 kilojoules. Converting an energy amount does not account for fuel quality, appliance losses or conversion efficiency.
Precision and rounding
The calculator keeps decimal precision during the conversion. Displayed values use up to 10 significant digits; an approximation sign marks the reference results. Keep extra digits until your final measurement or purchase decision.
References
Definitions and method references. Example rates and prices on this page are editable assumptions.