What is this calculator?
Estimate energy use and cost from power and operating time.
What can you use it for?
Use it for practical planning, conversions, measurement or checking the result described here. Estimate energy use and cost from power and operating time.
How to use it
- Enter appliance power (w).
- Enter hours per day.
- Enter days.
- Enter cost per kwh.
- Select Calculate (or Generate for random tools).
- Read the answer and any additional results below the form. Check the units and the limits of the method.
Formula and method
Energy used = appliance power/1000 × hours per day × days
The formula uses the units and definitions shown above. Each input is substituted before the arithmetic is evaluated; the calculated output is rounded for display.
Worked example
Appliance power (W): 1000, Hours per day: 5, Days: 30, Cost per kWh: 50. The result is 7,500 (electricity cost).
Assumptions and limits
Use the units and formats shown in the input labels. Actual conditions and applicable standards may differ from this simplified calculation.
Frequently asked questions
What inputs does the Electricity Calculator need?
Use appliance power (w), hours per day, days, cost per kwh. Read the answer and any additional results below the form. Check the units and the limits of the method.
What assumptions apply to the Electricity Calculator?
Use the units and formats shown in the input labels. Actual conditions and applicable standards may differ from this simplified calculation.