Joules to Watts Calculator
Find average power from energy and time: P = E / t. Default 3600 J over 3600 s gives 1 W. Informational only.
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How to convert joules to watts
- Enter total energy in joules.
- Enter the time interval and unit.
- Read average watts over that interval.
- Instantaneous peaks need measurements, not this average. Nothing is uploaded.
Joules to watts
P = E / t
| Energy | Joules consumed or delivered |
|---|---|
| Time | Duration in converted seconds |
| Power | Average watts over the interval |
| Default | 3600 J / 3600 s = 1 W |
| Inverse | Watts to joules multiplies P×t |
| Approval | Informational. Not a meter audit. |
Average power
P = E / t. Three thousand six hundred joules spread over one hour (3600 s) averages to 1 W.
Average vs peak
This is mean power over the typed interval. A pulse that delivers 3600 J in one second is 3600 W average during that second, not 1 W.
Watts to joules
Watts to joules multiplies when power is constant.
kWh bills
Convert joules to kWh on joules to kWh before cost on electricity cost.
Limits
Single interval average.
The formula runs in this tab. CZNull does not receive the numbers.
Informational only. Not wiring, code, or manufacturer approval. See the disclaimer.
What power matches 3600 J in 3600 s?
1 W average over that hour-long interval.
Can time be in hours?
Yes. Pick hours and enter 1 for one hour; the engine converts to seconds before dividing.
Does this give peak wattage?
No. It returns average power = energy divided by total time.
How do I go from watts back to joules?
Use watts to joules and multiply power by time.
How many joules in one kWh?
3.6 million joules. The joules to kWh converter expresses that in bill units.