GUIDE · 2026-07-22
How to use the Electricity Cost Calculator
Check the running cost of air conditioners, computers, heaters and other appliances. The result follows “Monthly kWh = watts ÷ 1000 × hours per day × days × devices” and is designed for situations such as estimate air-conditioner use. Inputs are handled immediately in your browser with no account required.
How it works
Monthly kWh = watts ÷ 1000 × hours per day × days × devices
Most processing stays in your browser instead of sending inputs to our server. Verify important financial or contractual decisions against an authoritative source.
Useful examples
- Estimate air-conditioner use
- Compare several office computers
- Measure the value of an efficient appliance
Frequently asked questions
Will it match my utility bill?
It is an energy-only estimate and does not include tiered pricing, base charges or taxes.
Can I include standby power?
Yes. Run a separate calculation using the device's standby wattage.