Convert Megajoules to Calories
1 megajoule (MJ) equals 239005.7361 calories (cal).
1 MJ = 239005.7361 cal
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk megajoule to calorie converter to paste a column from Excel.
How to Convert Megajoule to Calorie
- 1 MJ = 239005.7361 cal
- 1 cal = 0.000004184 MJ
- Example: convert 15 MJ to cal: 15 MJ = 15 × 239005.7361 cal = 3585086.042 cal
Reference conditions. cal: Thermochemical calorie, 4.184 J exactly. The International Table calorie is 4.1868 J.
Formula
cal = MJ × 239005.7361377
Derivation from SI units:
- 1 MJ = 10⁶ J
- 1 cal (thermochemical) = 4.184 J (exact)
- 1 MJ = 1000000 J ÷ 4.184 J per cal = 239005.7361377 cal
Both units are defined exactly, so the factor is exact. Megajoule definition: megajoule; Calorie definition: calorie.
Worked examples
- A reading of 35 MJ converts to 8365200.765 cal.
35 MJ × 239005.7361 = 8365200.765 cal - A value of 50 MJ is 11950286.81 cal.
50 MJ × 239005.7361 = 11950286.81 cal
Megajoule to Calorie conversion table
| Megajoules (MJ) | Calories (cal) |
|---|---|
| 1 MJ | 239005.7361 cal |
| 3.6 MJ | 860420.6501 cal |
| 10 MJ | 2390057.361 cal |
| 35 MJ | 8365200.765 cal |
| 38 MJ | 9082217.973 cal |
| 45 MJ | 10755258.13 cal |
| 50 MJ | 11950286.81 cal |
| 100 MJ | 23900573.61 cal |
| 1000 MJ | 239005736.1 cal |
Where it's used
Megajoules are used for fuel heating values (natural gas ≈ 38 MJ/m³, diesel ≈ 45 MJ/kg), while calories appear in chemistry and calorimetry. Both measure energy, work and heat, so the conversion is a fixed factor.
Megajoule to other energy units
| Conversion | 1 MJ equals |
|---|---|
| megajoule to joule | 1000000 J |
| megajoule to kilojoule | 1000 kJ |
| megajoule to calorie | 239005.7361 cal |
| megajoule to kilocalorie | 239.0057361 kcal |
| megajoule to watt-hour | 277.7777778 Wh |
| megajoule to kilowatt-hour | 0.2777777778 kWh |
| megajoule to BTU | 947.8171203 BTU |
| megajoule to therm | 0.00948043428 thm |
| megajoule to electronvolt | 6.241509074 × 10²⁴ eV |
| megajoule to foot-pound | 737562.1493 ft·lbf |
| megajoule to erg | 10000000000000 erg |
Frequently asked questions
How many calories are in 1 megajoule?
1 MJ = 239005.7361 cal.
How do I convert megajoules to calories?
Multiply the value in MJ by 239005.7361. For example, 15 MJ × 239005.7361 = 3585086.042 cal.
Is the MJ to cal conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "calorie (thermochemical) (cal_th)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Megajoules to Calories. Retrieved October 17, 2026, from https://scientificconverters.com/energy/megajoules-to-calories/
IEEE
Scientific Converters, "Convert Megajoules to Calories," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/megajoules-to-calories/