Enter the values
W
Shown on the appliance spec label (e.g. AC 500–1500 W, microwave ~1000 W).
h/day
/kWh
Default is a rough average. Replace it with the energy charge on your bill for accuracy.
Monthly cost (30 days)
—
How to use the electricity cost calculator
"How much does this air conditioner cost per month?" You can estimate an appliance's cost from its power consumption, how long you use it, and the unit price. Enter the three values to see the daily, monthly and yearly cost.
How to use it
Find the wattage (W) on the appliance or in its manual. Enter the daily usage and unit price to see the energy (kWh) and cost. Since the price varies by plan, replace it with the energy charge on your bill for accuracy.
A guide for saving energy
To check standby power, enter the standby wattage and set usage to 24 hours. Comparing several appliances shows which are the "heavy" ones, helping you decide on replacement or usage habits. Note that a real bill also adds base charges and levies.
Frequently asked questions
How is the electricity cost calculated?+
Energy (kWh) = watts × hours / 1000, and cost = kWh × unit price.
A month is treated as 30 days and a year as 365 days.
A month is treated as 30 days and a year as 365 days.
What unit price should I enter?+
Enter the per-kWh energy charge from your electricity plan for accuracy.
If unknown, a rough default is provided, but replace it with the rate on your bill.
If unknown, a rough default is provided, but replace it with the rate on your bill.
Can I estimate standby power?+
Yes. Enter the standby wattage and set usage to 24 hours to estimate the cost of a device left on standby all day.
Why does it differ from my actual bill?+
Real bills add a base charge, fuel-cost adjustments, renewable-energy levies and tiered rates.
This tool estimates only the usage-based energy charge.
This tool estimates only the usage-based energy charge.
Are my inputs stored?+
No. All calculation happens in your browser, and the values you enter are never sent to or stored on a server.
Formula
・Energy kWh = watts × hours / 1000
・Cost = kWh × unit price (per kWh)
・A month = 30 days, a year = 365 days
・The default price is a rough household average and varies by contract and period. Check your provider's tariff and bill for the exact rate.
・Energy kWh = watts × hours / 1000
・Cost = kWh × unit price (per kWh)
・A month = 30 days, a year = 365 days
・The default price is a rough household average and varies by contract and period. Check your provider's tariff and bill for the exact rate.
Please note
This site does not represent any electricity provider or other organization and does not guarantee the accuracy of the results. Actual charges vary with base fees, adjustments and tiered rates. Check your provider's tariff and bill for exact amounts.
This site does not represent any electricity provider or other organization and does not guarantee the accuracy of the results. Actual charges vary with base fees, adjustments and tiered rates. Check your provider's tariff and bill for exact amounts.