How many kilojoules are in a watt hour?

One watt hour equals 3.6 kilojoules.

How do I convert watt hours to kilojoules by hand?

Multiply the number of watt hours by 3.6. For a rough check, 3.6 is close enough for most everyday use.

10 watt hours is 36 kilojoules.

10 Wh = 36 kJ. Change the amount below, or read the formula and the reference table further down.

From

10 watt hours equals

36kilojoules

1 Wh = 3.6 kJ

Watt hours and kilojoules both measure energy from the same zero, so a single multiplier does the job.

kJ = Wh × 3.6

Values either side of 10 Wh.

How many kilojoules are in a watt hour?: One watt hour equals 3.6 kilojoules.
How do I convert watt hours to kilojoules by hand?: Multiply the number of watt hours by 3.6. For a rough check, 3.6 is close enough for most everyday use.
What is 10 watt hours in kilojoules?: 10 watt hours is 36 kilojoules.

Calcuit generates this page from a unit table, so the factors here match every other page on the site.