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Kilojoules to watt-hours

1 kilojoule in watt-hours
1 kJ = 0.27778 Wh
Wh = kJ × 5/18

To convert kilojoules to watt-hours, multiply by 0.2777777778. The table below gives the values people look up most often, and the converter works for any number.

Kilojoules to watt-hours table

Common kilojoule values converted to watt-hours.
Kilojoules Watt-hours
1 kJ 0.27778
2 kJ 0.55556
3 kJ 0.83333
4 kJ 1.111111
5 kJ 1.388889
10 kJ 2.777778
15 kJ 4.166667
20 kJ 5.555556
25 kJ 6.944444
30 kJ 8.333333
40 kJ 11.11111
50 kJ 13.88889
75 kJ 20.83333
100 kJ 27.77778
250 kJ 69.44444
500 kJ 138.8889
1,000 kJ 277.7778

How the conversion works

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

Common questions

How many watt-hours are in one kilojoule?
One kilojoule equals 0.27778 watt-hours. Wh = kJ × 5/18.
How do you convert kilojoules to watt-hours?
Use Wh = kJ × 5/18. So 10 kJ is 2.777778 Wh.
How many kilojoules are in one watt-hour?
One watt-hour equals 3.6 kilojoules, 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