Watts to Joules Calculator
Convert average power in watts (W) over a period of time to energy in joules (J).
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J
Formula: J = W × seconds
How to convert Watts to Joules
The formula is Joules = Watts × Seconds.
For example, a 60 W light bulb running for 120 seconds consumes exactly 7200 J of energy. Remember to always convert your time into seconds before multiplying.
Common Watts to Joules Conversions
| Power (Watts) | Time | Energy (Joules) |
|---|---|---|
| 10 W | 1 minute (60s) | 600 J |
| 60 W | 120 seconds | 7200 J |
| 100 W | 1 hour (3600s) | 360,000 J |
| 1000 W | 1 second | 1000 J |
| 1500 W | 1 minute (60s) | 90,000 J |
Frequently Asked Questions
What is a Joule?
A joule is the standard unit of energy in the International System of Units (SI). It is equal to the energy transferred when applying a force of one newton through a distance of one meter.
Is a watt equal to a joule?
No. A watt is a unit of power (rate of energy transfer), equal to one joule per second.
How many joules are in a kWh?
One kilowatt-hour (kWh) is exactly 3,600,000 joules (or 3.6 megajoules).