EnergyCost
Calculator

Watts into energy

Watts to kWh calculator

Convert electrical power and operating time into kilowatt-hours, then see daily, period, and annual totals.

Private browser calculation

Power, time, use, and rate

Stays on this page

Input method

Appliance input

Use rated power and the time the appliance actively runs for one use.

Usage and electricity price

Currency is a display label; enter a rate in that currency per kWh.

This is a flat-rate estimate, not an electricity bill. It does not include tariff tiers, taxes, fixed charges, standby power, duty cycles, efficiency losses, or changing rates.