energy = power × timeCheck whether a speed is in bits or bytes and whether power is entered in watts or kilowatts.
Calculate
Electricity cost calculator
Estimate electricity use and cost from power, hours and tariff.
LocalFree
This tool runs on your device in the browser.
Instructions and limitations
TOOL GUIDE
What this tool is for
Electricity cost calculator — Estimate electricity use and cost from power, hours and tariff.
Useful for quick everyday estimates and for checking arithmetic with clearly entered values.
Common uses
- Check everyday arithmetic
- Compare possible values
- Create a quick estimate
Educational and informational use
Results are general estimates, not legal, financial, tax, medical, engineering, or other professional advice. Check inputs and units and consult a qualified professional for important decisions.
EXPLANATION & EXAMPLE
Understand the result—not just the number
1.5 kW × 4 h = 6 kWhAfter calculating, the tool shows the values used and the working so you can check it.