Electricity Cost Calculator
Estimate how much a device or appliance costs to run from power, daily usage, and electricity price.
Use it for heaters, cooking appliances, tools, or any other load where you know the wattage.
Result
--
Run the calculation to see the cost.
| Metric | Value |
|---|---|
| Daily energy | -- |
| Daily cost | -- |
| Monthly cost | -- |
| Annual cost | -- |
Quick Answer
Multiply power in watts by hours used, convert to kWh, and multiply by the price per kWh to estimate electricity cost.
How to Calculate
- Enter the device power in watts.
- Enter how many hours it runs each day.
- Enter your electricity price per kWh.
- Click Calculate to see daily and yearly cost.
Formula
Daily energy = power / 1000 x hours per day
Daily cost = daily energy x price per kWh
Annual cost = daily cost x days per year
Worked Examples
Example 1: A 1500 W heater used 3 hours per day at $0.28 per kWh costs about $1.26 per day.
Example 2: That same heater used every day for a year costs about $459.90.
Example 3: A 100 W device used 10 hours per day at $0.20 per kWh costs about $0.20 per day.
How to Interpret Your Results
| Output | Meaning | Action |
|---|---|---|
| Daily cost | Estimated cost for one day of use. | Use it for day-to-day budgeting. |
| Monthly cost | Estimated cost if usage stays similar. | Use it for recurring expense planning. |
| Annual cost | Estimated yearly electricity spending. | Useful for annual budget comparisons. |
Frequently Asked Questions
Multiply kilowatts by 1000 before entering the value.
Yes. You can change it for leap years, seasonal use, or partial-year estimates.
Yes. It shows daily energy in kWh along with cost estimates.
Related Calculators
References
- OmniCalculator reference page
- Cost is based on power, time, and the rate per kWh.
- Last reviewed: March 2026.