Wh to Joules
A watt-hour is one watt for one hour, 3,600 joules. Laptop batteries hold 50–100 Wh and a typical power bank about 37 Wh (10,000 mAh at 3.7 V).
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Common values
Formula
J = Wh × 3600
mAh alone says nothing about energy. Multiply by the voltage to get Wh before comparing batteries across devices.
Frequently asked questions
QHow many J is 1 Wh?
1 Wh is 3600 J, and 10 Wh is 36000 J. Type any value in the box above to convert instantly.
QAnd how many Wh is 1 J?
1 J is 0 Wh. This converter works both ways, so typing in the right box updates the left one.
QWhere is this unit used?
mAh alone says nothing about energy. Multiply by the voltage to get Wh before comparing batteries across devices.
Other converters
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Traditional units (geun, doe, majigi and so on) vary by region and product.