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Watt-hours to kilojoules

1 watt-hour in kilojoules
1 Wh = 3.6 kJ
kJ = Wh × 18/5

To convert watt-hours to kilojoules, multiply by 3.6. The table below gives the values people look up most often, and the converter works for any number.

Watt-hours to kilojoules table

Common watt-hour values converted to kilojoules.
Watt-hours Kilojoules
1 Wh 3.6
2 Wh 7.2
3 Wh 10.8
4 Wh 14.4
5 Wh 18
10 Wh 36
15 Wh 54
20 Wh 72
25 Wh 90
30 Wh 108
40 Wh 144
50 Wh 180
75 Wh 270
100 Wh 360
250 Wh 900
500 Wh 1,800
1,000 Wh 3,600

How the conversion works

The relationship is kJ = Wh × 18/5. Both units measure energy, so the conversion is a fixed factor that never changes.

Common questions

How many kilojoules are in one watt-hour?
One watt-hour equals 3.6 kilojoules. kJ = Wh × 18/5.
How do you convert watt-hours to kilojoules?
Use kJ = Wh × 18/5. So 10 Wh is 36 kJ.
How many watt-hours are in one kilojoule?
One kilojoule equals 0.27778 watt-hours, which is the reverse of the conversion above.

Related pages

Sources

  1. Guide for the Use of the International System of Units (SP 811) — NIST (Public domain (US Government))
  2. The International System of Units (SI Brochure) — Bureau International des Poids et Mesures
  3. Calculated on this page — At One Place

How these figures are compiled and checked