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.

2 watt hours is 7.2 kilojoules.

2 Wh = 7.2 kJ. Change the amount below, or read the formula and the reference table further down.

From

2 watt hours equals

7.2kilojoules

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 2 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 2 watt hours in kilojoules?: 2 watt hours is 7.2 kilojoules.

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