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Examples, chart, and saved snapshots
Start with a realistic example, adjust the inputs, or save your numbers before experimenting.
Running a portable heater
Use a 1,500-watt heater for three hours a day, 20 days per month, at an electricity price of 0.30 per kWh.
Appliance power: 25% lower
Change appliance power to 1,125 W while keeping the other example values the same.
Appliance power: 25% higher
Change appliance power to 1,875 W while keeping the other example values the same.
Interactive chart
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Quick answer
What does the Appliance electricity cost calculate?
What does an appliance cost per use, month, and year? This calculator uses appliance power, hours used per day, days used per month, and electricity price to estimate running cost immediately in your browser.
With the values currently entered, the result is $15.36 — per month. It also shows energy / month, per use-day, and per year.
How to use the Appliance electricity cost
- Replace the example values with your own numbers.
- Review the result and supporting figures as they update automatically.
- Check the formula and assumptions before using the estimate for a decision.
Inputs used
- Appliance power — entered in W
- Hours used per day — entered in hrs
- Days used per month — entered in days
- Electricity price — entered in / kWh
Appliance electricity cost formula
Watts ÷ 1000 × hours × days × electricity rate
Assumptions
- The appliance draws the stated power continuously.
- Taxes and time-of-use changes are reflected in your rate.
Verify the inputs
Authoritative sources
These sources explain the definitions, factors, or rules behind this tool. Their geographic scope is shown because an official source for one country is not automatically valid somewhere else.
Sources do not endorse Calculum. Check the source date, scope, and your own documents before making a financial, tax, insurance, or reporting decision.
Practical guide
Appliance electricity cost example and edge cases
An appliance costs money when it draws power and runs for time. The wattage alone does not tell the whole story.
Example: Running a portable heater
Use a 1,500-watt heater for three hours a day, 20 days per month, at an electricity price of 0.30 per kWh.
- Appliance power
- 1,500 W
- Hours used per day
- 3 hrs
- Days used per month
- 20 days
- Electricity price
- 0.3 / kWh
Calculated result$27.00per month
Change the hours first when comparing habits. Runtime usually has the clearest effect.
Example results use the default display profile. The calculator above follows your selected country and units.
How to read the result
- The label wattage is often the maximum draw. A thermostat can reduce actual use.
- Use the marginal electricity rate when possible. Fixed monthly charges do not change with appliance use.
Edge cases worth checking
The appliance cycles on and off
Measure average use with an energy monitor, or reduce the entered hours to reflect the duty cycle.
The tariff changes by time
Calculate peak and off-peak use separately. Add the two costs afterward.
What changes the result most
Appliance power
Change appliance power on its own first. This shows how strongly it affects the answer.
Hours used per day
Change hours used per day on its own first. This shows how strongly it affects the answer.
Days used per month
Keep days used per month on the same time basis as the other inputs. Monthly and annual values are easy to mix up.
Try a different scenario
Small changes show whether the answer is stable or sensitive.
Appliance power: 25% lower
1,125 W$20.25per month
Appliance power: 25% higher
1,875 W$33.75per month
Hours used per day: 25% higher
4 hrs$36.00per month
Common mistakes
Check appliance power
The appliance draws the stated power continuously. Make sure this matches the number you enter.
Keep electricity price consistent
Taxes and time-of-use changes are reflected in your rate. Use the same units and time period throughout the calculation.
Do not rely on one appliance electricity cost scenario
Run a cautious case and an optimistic case. The range is often more useful than one exact-looking number.
Use this result well
What does an appliance cost per use, month, and year?
Actual tariffs, weather, equipment behavior, and fixed charges can change the bill.