Convert Megajoules to BTU
1 megajoule (MJ) equals 947.8171203 British thermal units (BTU).
1 MJ = 947.8171203 BTU
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk megajoule to BTU converter to paste a column from Excel.
How to Convert Megajoule to BTU
- 1 MJ = 947.8171203 BTU
- 1 BTU = 0.001055055853 MJ
- Example: convert 15 MJ to BTU: 15 MJ = 15 × 947.8171203 BTU = 14217.2568 BTU
Reference conditions. BTU: International Table BTU (BTU_IT), 1055.05585262 J exactly.
Formula
BTU = MJ × 947.8171203133
Derivation from SI units:
- 1 MJ = 10⁶ J
- 1 BTU_IT = 1055.05585262 J (exact)
- 1 MJ = 1000000 J ÷ 1055.05585262 J per BTU = 947.8171203133 BTU
Both units are defined exactly, so the factor is exact. Megajoule definition: megajoule; BTU definition: British thermal unit.
Worked examples
- A reading of 35 MJ converts to 33173.59921 BTU.
35 MJ × 947.8171203 = 33173.59921 BTU - A value of 50 MJ is 47390.85602 BTU.
50 MJ × 947.8171203 = 47390.85602 BTU
Megajoule to BTU conversion table
| Megajoules (MJ) | BTU |
|---|---|
| 1 MJ | 947.8171203 BTU |
| 3.6 MJ | 3412.141633 BTU |
| 10 MJ | 9478.171203 BTU |
| 35 MJ | 33173.59921 BTU |
| 38 MJ | 36017.05057 BTU |
| 45 MJ | 42651.77041 BTU |
| 50 MJ | 47390.85602 BTU |
| 100 MJ | 94781.71203 BTU |
| 1000 MJ | 947817.1203 BTU |
Where it's used
Megajoules are used for fuel heating values (natural gas ≈ 38 MJ/m³, diesel ≈ 45 MJ/kg), while British thermal units appear in furnace, boiler and fuel ratings in the US. 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 British thermal units are in 1 megajoule?
1 MJ = 947.8171203 BTU.
How do I convert megajoules to British thermal units?
Multiply the value in MJ by 947.8171203. For example, 15 MJ × 947.8171203 = 14217.2568 BTU.
Is the MJ to BTU 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, "British thermal unit_IT (Btu_IT)".
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 BTU. Retrieved October 17, 2026, from https://scientificconverters.com/energy/megajoules-to-btu/
IEEE
Scientific Converters, "Convert Megajoules to BTU," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/megajoules-to-btu/