Convert watt-hours to kilojoules
1 Wh = 3.6 kJ — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
3.6kJ
As a fraction: 18/5
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1 Wh = 3.6 kJ
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 kilojoules
Multiply the number of watt-hours by 3.6 to get kilojoules.
The exact factor is 3.6 — as a fraction, 18/5.
Watt-hour to Kilojoule conversion table
| Watt-hours (Wh) | Kilojoules (kJ) |
|---|---|
| 1 Wh | 3.6 |
| 2 Wh | 7.2 |
| 3 Wh | 10.8 |
| 5 Wh | 18 |
| 10 Wh | 36 |
| 20 Wh | 72 |
| 25 Wh | 90 |
| 50 Wh | 180 |
| 100 Wh | 360 |
| 250 Wh | 900 |
| 500 Wh | 1800 |
| 1000 Wh | 3600 |
Kilojoule to Watt-hour conversion table
| Kilojoules (kJ) | Watt-hours (Wh) |
|---|---|
| 1 kJ | 0.277 777 78 |
| 2 kJ | 0.555 555 56 |
| 3 kJ | 0.833 333 33 |
| 5 kJ | 1.388 888 9 |
| 10 kJ | 2.777 777 8 |
| 20 kJ | 5.555 555 6 |
| 25 kJ | 6.944 444 4 |
| 50 kJ | 13.888 889 |
| 100 kJ | 27.777 778 |
| 250 kJ | 69.444 444 |
| 500 kJ | 138.888 89 |
| 1000 kJ | 277.777 78 |
Frequently asked
How many kilojoules are in a watt-hour?
One watt-hour equals 3.6 kilojoules (Wh → kJ). That figure is exact, not rounded.
How do you convert watt-hours to kilojoules?
Multiply the number of watt-hours by 3.6 to get kilojoules.
What is 1 kJ in watt-hours?
One kilojoule is 0.2777777778 watt-hours.
What is 10 Wh in kJ?
10 Wh = 36 kJ.