See what an appliance costs to run — from its wattage, hours of use, and your electricity rate.
Uses nameplate wattage; many appliances draw less on average or cycle on and off. Check your bill for the exact per-kWh rate (plus any fixed charges). Estimate only.
Power (watts) times hours gives watt-hours; divide by 1,000 for kilowatt-hours (kWh), the unit your utility bills. Multiply by your rate to get the cost — scaled to a day, month, or year.
Cost = (watts ÷ 1,000) × hours × rate
On the appliance's label or manual. If only volts and amps are listed, watts ≈ volts × amps.
This is one appliance. Your bill sums everything, plus fixed fees, taxes, and possibly tiered or time-of-use rates.
Related: bookkeeping tracker · break-even calculator · all free calculators.
Yes. The Electricity Cost Calculator is completely free, runs in your browser, and never asks for a signup, email, or download. Enter your numbers and the result updates instantly.
It uses standard formulas and recalculates the moment you change a value, so the math is exact for the inputs you enter. Treat the result as a reliable planning estimate; for decisions with legal or tax consequences, confirm the figures with a qualified professional.
Yes. The calculator is mobile-friendly and works on any phone, tablet, or computer — there is no app to install and nothing to save.
Yes. Scroll to “Add this free calculator to your site” above and copy the embed snippet to place the live calculator on your blog or website for free.
Last reviewed: September 2026. Free to use, no signup — Electricity Cost Calculator by ToolWise Digital.
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