Joules to watts calculator
A watt is one joule per second. Enter energy and time to get average power, or switch direction.
VC-23 energy ⇄ powerW = J / s
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J
Average power60W
Joules and watts
The joule is the SI unit of energy; the watt is one joule per second. So W = J ÷ s and J = W × s. One kilowatt-hour is 3.6 million joules.
Examples: a camera flash that dumps 50 J in 1 ms peaks at 50,000 W. A 10 W phone charger delivers 36,000 J an hour.
Questions people ask
How do I convert joules to watts?
Divide joules by seconds: W = J ÷ s. 3,600 J delivered over 60 s is 60 W.
How many joules are in a kWh?
Exactly 3,600,000 J (1,000 W × 3,600 s).