Kilojoules to megajoules – convert kJ to MJ
Convert kilojoules to megajoules (kJ to MJ) to roll smaller energy values into larger totals. Great for gas and electricity bills, nutrition labels, engine or boiler energy and physics problems.
Open the interactive kJ → MJ converter:
Use main converter (kJ → MJ) or switch to MJ → kJThe energy converter also supports joules, kilowatt-hours, BTU and more for everyday and engineering calculations.
Quick reference: kJ to MJ
One megajoule is 1,000 kilojoules. So: MJ = kJ ÷ 1,000. Examples:
| Kilojoules (kJ) | Megajoules (MJ) |
|---|---|
| 10 kJ | 0.01 MJ |
| 50 kJ | 0.05 MJ |
| 100 kJ | 0.1 MJ |
| 500 kJ | 0.5 MJ |
| 1,000 kJ | 1 MJ |
| 5,000 kJ | 5 MJ |
| 10,000 kJ | 10 MJ |
Why convert kilojoules to megajoules?
kJ to MJ is handy when you:
- Summarise many kJ readings from meters or experiments.
- Compare appliance or vehicle energy use over time.
- Convert nutrition or exercise energy into MJ for reports.
- Teach how SI energy units scale from J to kJ to MJ.
Other energy converters on this site
All SI energy units on the homepage use exact powers of ten, so J, kJ and MJ all stay perfectly aligned with one another.
Page last updated: 4 December 2025.