Energy Cost Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the appliance power in watts, hours used per day and your electricity price.
- Press Calculate for the running cost.
How it works
Daily energy = power (W) ÷ 1000 × hours used. Multiply by the price per kWh for the daily cost, then scale up to a month and a year.
Worked example
100 W for 24 h at $0.30/kWh. 2.4 kWh/day × $0.30 = $0.72 a day.
Frequently asked questions
Why doesn't this match my bill?
Bills also include daily supply charges, tiered tariffs and GST.
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Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.