Electricity Cost Calculator
Estimate how much it costs to run an appliance per day, month and year.
How the cost is calculated
Power in watts is converted to kilowatts (dividing by 1000), then multiplied by the daily usage hours to get kilowatt-hours (kWh) consumed per day. That figure is multiplied by your electricity price per kWh to get the daily cost, which is then scaled up to monthly (×30) and yearly (×365) estimates.
Finding your inputs
- Wattage is usually printed on the appliance's label or in its manual - if only amps and voltage are given, multiply them together to estimate watts
- Your price per kWh is shown on your electricity bill, usually as a rate per kilowatt-hour
- Use the appliance count field to estimate the combined cost of several identical devices, like a set of light bulbs
Frequently asked questions
Where do I find my electricity price per kWh?
Check your latest electricity bill - most providers list a rate per kilowatt-hour directly, or you can divide your total bill amount by your total kWh usage for that period to calculate it yourself.
Does this account for standby power when the appliance is off?
No, this calculator only estimates the cost while the appliance is actively running for the hours you specify. Many electronics draw a small amount of standby power even when off, which isn't included here.
Why do air conditioners and water heaters cost so much more than other appliances?
They have much higher wattage than most household devices (often 1000-3500 watts versus 5-100 watts for small electronics), so even a few hours of daily use adds up to a significant share of a typical electricity bill.