Convert watt-hours to megajoules
1 Wh = 0.0036 MJ — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
0.0036MJ
As a fraction: 9/2500
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1 Wh = 0.0036 MJ
Show this value in all 39 energy & work units
- Petajoules PJ 3.6e-12
- Terajoules TJ 3.6e-9
- Gigajoules GJ 0.000 003 6
- Megajoules MJ 0.0036
- Kilojoules kJ 3.6
- Joules J 3600
- Millijoules mJ 3 600 000
- Microjoules µJ 3 600 000 000
- Nanojoules nJ 3 600 000 000 000
- Watt-hours Wh 1
- Kilowatt-hours kWh 0.001
- Megawatt-hours MWh 0.000 001
- Gigawatt-hours GWh 1e-9
- Terawatt-hours TWh 1e-12
- Calorie (thermochemical)s cal 860.420 650 096
- Kilocalories kcal 0.860 420 650 096
- Calorie (IT)s cal (IT) 859.845 227 859
- Kilocalorie (IT)s kcal (IT) 0.859 845 227 859
- British thermal units BTU 3.412 141 633 13
- BTU (thermochemical)s BTU (th) 3.414 425 949 64
- Million BTUs MMBTU 0.000 003 412 141 633 13
- Therm (US)s thm 0.000 034 129 563 407
- Therm (EC)s thm (EC) 0.000 034 121 411 564 9
- Electronvolts eV 2.24694326681e+22
- Kiloelectronvolts keV 2.24694326681e+19
- Megaelectronvolts MeV 2.24694326681e+16
- Gigaelectronvolts GeV 22 469 432 668 100
- Teraelectronvolts TeV 22 469 432 668.1
- Ergs erg 36 000 000 000
- Foot-pounds ft·lbf 2655.223 737 4
- Inch-pounds in·lbf 31 862.684 848 8
- Foot-poundals ft·pdl 85 429.297 455 2
- Horsepower-hours hp·h 0.001 341 022 089 6
- Tonne of TNTs t TNT 0.000 000 860 420 650 096
- Kiloton of TNTs kt TNT 8.60420650096e-10
- Megaton of TNTs Mt TNT 8.60420650096e-13
- Hartrees Eₕ 8.25736420223e+20
- Rydbergs Ry 1.65147284045e+21
- Quads quad 3.41214163313e-15
Every row is Watt-hour (Wh) converted through the joule, in exact rational arithmetic.
How to convert watt-hours to megajoules
Multiply the number of watt-hours by 0.0036 to get megajoules.
The exact factor is 0.0036 — as a fraction, 9/2500.
Watt-hour to Megajoule conversion table
| Watt-hours (Wh) | Megajoules (MJ) |
|---|---|
| 1 Wh | 0.0036 |
| 2 Wh | 0.0072 |
| 3 Wh | 0.0108 |
| 5 Wh | 0.018 |
| 10 Wh | 0.036 |
| 20 Wh | 0.072 |
| 25 Wh | 0.09 |
| 50 Wh | 0.18 |
| 100 Wh | 0.36 |
| 250 Wh | 0.9 |
| 500 Wh | 1.8 |
| 1000 Wh | 3.6 |
Megajoule to Watt-hour conversion table
| Megajoules (MJ) | Watt-hours (Wh) |
|---|---|
| 1 MJ | 277.777 78 |
| 2 MJ | 555.555 56 |
| 3 MJ | 833.333 33 |
| 5 MJ | 1388.8889 |
| 10 MJ | 2777.7778 |
| 20 MJ | 5555.5556 |
| 25 MJ | 6944.4444 |
| 50 MJ | 13 888.889 |
| 100 MJ | 27 777.778 |
| 250 MJ | 69 444.444 |
| 500 MJ | 138 888.89 |
| 1000 MJ | 277 777.78 |
Frequently asked
How many megajoules are in a watt-hour?
One watt-hour equals 0.0036 megajoules (Wh → MJ). That figure is exact, not rounded.
How do you convert watt-hours to megajoules?
Multiply the number of watt-hours by 0.0036 to get megajoules.
What is 1 MJ in watt-hours?
One megajoule is 277.7777778 watt-hours.
What is 10 Wh in MJ?
10 Wh = 0.036 MJ.