Appliance Energy Cost Calculator
Estimate kilowatt-hours and cost from appliance power, hours, and a tariff you enter.
Find the watts on the device label. Typical values are a guide only; a fridge or AC does not run at full power all the time.
From your electricity bill. If your tariff has tiers, use the price of the tier you usually reach.
Your result
Enter the watts, the hours per day, and the price per kWh.
How to use it
- Enter the power in watts.
- Enter the running hours and the tariff.
- Read the energy and the cost.
Examples
- 1000 watts for 2 hours1000, 2, and 0.50. The energy is 2.00 and the cost is 1.00.
- 100 watts for ten hours100, 10, and a tariff of 0. The energy is 1.00 and the cost is 0.00.
- A fractional power100.5 watts. A message asks for a whole number.
Tool details and privacy
Kilowatt hours are the watts times the hours, divided by 1000. The cost is the energy times the tariff.
1000 watts for 2 hours at a tariff of 0.50 is 2.00 kWh and a cost of 1.00. 100 watts for 10 hours is 1.00 kWh.
Options
- Power is from 1 to 100000 watts and has no fraction. The tariff can be zero.
Limits
- Amounts use two decimal places and up to 12 digits before the decimal point. Rounding is half up.
- 1,250 is rejected. Write 1250 or 1250.50.
- It does not read an electricity meter.
Privacy
The numbers are calculated in your browser and are not sent to any server.
Questions
What does 1000 watts for 2 hours cost at 0.50?
2.00 kWh and a cost of 1.00.
And the energy of 100 watts for ten hours?
1.00 kWh.
Does it read a meter?
No.
Do watts allow a fraction?
No. Write a whole number.