Watts to Joules Calculator
Convert power over time to energy: E = P × t. Default 100 W for 60 seconds gives 6000 J (6 kJ). Informational physics and billing prep only.
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How to convert watts to joules
- Enter power in watts.
- Enter duration and pick seconds, minutes, or hours.
- Read energy in joules and kilojoules.
- Utility bills use kWh on converter pages. Nothing is uploaded.
Watts to joules
E = P × t
| Power | Watts, joules per second |
|---|---|
| Time | Seconds after unit conversion |
| Energy | Joules from the product |
| Default | 100 W × 60 s = 6000 J |
| kWh link | 3600 J = 1 Wh; see energy converter |
| Approval | Informational. Not a meter read. |
Energy is power times time
E = P × t. One hundred watts for sixty seconds is 6000 joules. Hours convert to seconds internally before multiplying.
Time unit picker
Pick minutes or hours for longer runs. The engine converts to seconds before applying E = P × t.
Joules to watts
Joules to watts divides energy by time to recover power.
kWh on the converter
Billable kWh lives on kWh to joules and the energy converter.
Limits
Constant power assumption.
The formula runs in this tab. CZNull does not receive the numbers.
Informational only. Not wiring, code, or manufacturer approval. See the disclaimer.
How many joules is 100 W for 60 seconds?
6000 J. Multiply 100 by 60.
Can I enter minutes?
Yes. Pick minutes in the time unit list and the engine converts to seconds.
How do joules relate to kWh?
1 kWh = 3.6×10⁶ J. Use the kWh to joules converter for bill units.
Is this the same as watts times hours?
Yes with time in hours: 100 W × 1 h = 360000 J. Pick hours in the unit list.
Where is average power from total energy?
On joules to watts when you know total joules and elapsed time.