Power and Energy
caltoMJ
Convert thermochemical calories (cal) to megajoules (MJ).
Factor1 cal = 4.184e-6 MJ
Converter
cal
Accepts numbers or expressions, e.g. 150 + 14.7
Result
MJ
Rendered to 6 significant figures.
Formula
Formula
MJ = cal × 4.184e-6
Multiply any value in thermochemical calories by 4.184e-6 to obtain the value in megajoules.
Worked example
Convert 100000 cal to MJ.
- 01Start with 100000 cal.
- 02Multiply by the conversion factor: 100000 × 4.184e-6 = 0.4184 MJ.
Result100000 cal = 0.4184 MJ
Conversion table
| cal | MJ |
|---|---|
| 1 | 4.184e-6 |
| 2 | 8.368e-6 |
| 5 | 2.092e-5 |
| 10 | 4.184e-5 |
| 20 | 8.368e-5 |
| 50 | 0.0002092 |
| 100 | 0.0004184 |
| 200 | 0.0008368 |
| 500 | 0.002092 |
| 1000 | 0.004184 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from cal to MJ?
1 cal equals 4.184e-6 MJ. To convert, multiply the value in thermochemical calories by 4.184e-6.
How do I convert 1 cal to MJ?
1 cal = 4.184e-6 MJ. For any value, multiply by 4.184e-6.
How do I convert MJ back to cal?
Divide by the same factor — or equivalently, multiply by 239005.7. So 1 MJ = 239006 cal.
When would I need to convert thermochemical calorie to megajoule?
Energy conversions are needed when reconciling fuel/electrical billing, calculating thermal duties, and aligning calorimetry or HHV/LHV figures across data sources.
Is the conversion exact?
Yes. Both cal and MJ are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).