Appliance energy cost calculator
See what a fridge, heater or TV costs per month from the wattage on its label.
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How to use it
- Enter appliance power, hours per day, quantity, days in month and price per kwh.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Daily kWh = watts × hours × quantity ÷ 1000. Monthly = daily × days in month. Yearly = daily × 365.
Example
Inputs: Appliance power = 1,000 W, Hours per day = 5, Quantity = 1, Days in month = 30, Price per kWh = 0.18 per kWh. Result: Monthly cost: 27.00; Daily energy: 5 kWh; Monthly energy: 150 kWh.
Limits and caveats
- Label wattage is usually the maximum; fridges and ACs do not draw it all the time.
- It uses one flat price per kWh with no tiers or VAT.
Questions about this tool
How do I turn watts into kWh?
Multiply watts by hours of use and divide by 1,000; a 1,000 W device for 5 hours uses 5 kWh.
Where do I find the wattage?
On the rating plate at the back or bottom, in watts (W), or as volts and amps that you multiply together.
Do devices on standby use power?
Many draw a few watts on standby; enter that wattage with 24 hours to see the cost.