Electricity Cost - Single Usage Calculator
Estimate the cost of one electricity use from wattage, usage time, and electricity price.
Useful for appliances, devices, heaters, kitchen tools, and other one-off energy estimates.
Result
--
Run the calculation to see the cost.
| Metric | Value |
|---|---|
| Energy used | -- |
| Cost per use | -- |
| Monthly cost | -- |
| Annual cost | -- |
Quick Answer
The calculator multiplies power by usage time to get energy in kWh, then multiplies by the electricity rate to estimate cost.
How to Calculate
- Enter the device power in watts.
- Enter how long it runs.
- Enter the electricity price per kWh.
- Click Calculate.
Formula
Energy used = power / 1000 x hours
Cost per use = energy used x price per kWh
Worked Examples
Example 1: A 1500 W heater used for 2 hours consumes 3 kWh.
Example 2: At $0.28 per kWh, that same heater costs about $0.84 per use.
Example 3: Repeating a one-hour use every day can be multiplied into a monthly estimate.
How to Interpret Your Results
| Output | Meaning | Action |
|---|---|---|
| Energy used | The kWh consumed in one use. | Use it to understand consumption. |
| Cost per use | The cost of one run of the device. | Useful for budgeting and comparisons. |
| Monthly cost | The estimated cost for repeated uses each month. | Use it for planning recurring expenses. |
Frequently Asked Questions
Enter the watt equivalent directly, or multiply the kilowatts by 1000 first.
Yes. The calculator converts minutes to hours automatically.
It is a planning estimate based on the number of uses you enter.
Related Calculators
References
- OmniCalculator reference page
- Energy use is calculated from power and time, then priced by the rate per kWh.
- Last reviewed: March 2026.