Electricity Cost Calculator
Estimate what electricity costs by multiplying the energy used, in kilowatt-hours, by your price per kWh.
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Cost: 21.60
About this tool
The calculator multiplies kWh by your unit rate. The result is in the same currency as the rate you enter. It does not include standing charges, taxes, or time-of-use pricing, which appear on many bills. To estimate an appliance's usage, multiply its power in watts by the hours it runs and divide by 1,000.
How to use it
- Enter the energy use in kWh (from your bill, meter, or the formula below).
- Enter your price per kWh.
- Read the estimated cost.
Cost = kWh × rate
kWh = watts × hours ÷ 1000
Examples
Space heater
A 2,000 W heater for 3 hours uses 2,000 × 3 ÷ 1,000 = 6 kWh. At 0.25 per kWh, that costs 1.50.
Monthly usage
300 kWh at 0.18 per kWh costs 54.00.
FAQ
Where do I find my rate?
On your electricity bill or your supplier's tariff page, usually per kWh.
Why is my bill higher than the estimate?
Bills often add a fixed daily charge, taxes, and different rates at different times of day.
Is this suitable for solar or EV planning?
It is a quick estimate. For solar or EV decisions, use detailed tariff and usage data.