Nothing is uploaded. This calculator runs entirely on your device. No account, no server, no tracking of what you type.

1. Pick a common appliance (optional)

Wattage (W)

Check the label on the appliance or its manual for the exact figure — printed wattage is more reliable than a guess.

2. How much you use it

Hours per day

Days per month it runs

3. Your electricity rate

Price per kWh (¢)

Defaults to the US average residential rate reported by the Energy Information Administration for June 2026 (18.34¢/kWh). Your actual rate is on your utility bill and can be quite different — replace it for a real number.

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per hour

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per month

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per year