How it works
Estimate energy and variable usage cost from appliance power and time. Fixed fees, tax rules and changing tariffs are excluded.
Inputs and units
| Input | Example value | What to enter |
|---|---|---|
| Appliance power | 1,500 W | Required unit: W. Use a non-negative value. |
| Hours per day | 2 | Enter a numeric value. Use a non-negative value. Allowed range: 0–24. |
| Days | 30 | Enter a numeric value. Use a whole number. Must be greater than zero. Allowed range: 1–366. |
| Price per kWh | 0.25 | Enter a numeric value. Use a non-negative value. |
Worked example
Show example inputs and results
This example is generated by the same calculation engine using the starting values in the form. Your own inputs produce your own result.
- Appliance power
- 1,500 W
- Hours per day
- 2
- Days
- 30
- Price per kWh
- 0.25
Complete example results
- Usage cost
- 22.5
- Energy
- 90 kWh
Reading the result
Convert measurements to the same unit and use the net area to cover. Replace any package, waste or efficiency input with your product information. A quantity estimate alone does not determine installation conditions.
Questions and answers
Can I use the example values for my own calculation?
The example values illustrate the calculation. Replace every input with your own information, especially dates, rates and the selected operation.
Why are some results rounded?
Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.
Are my inputs sent to a server?
The calculator processes inputs in your browser. Its code does not send your values to a server.