Electricity Bill Calculator
Estimate electricity usage and cost from watts, usage hours, and utility rate.
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Device power W
Hours per day h
Number of days days
Electricity rate $/kWh
Fill in the fields above and press Calculate or hit Enter ↵
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Understand appliance energy cost in minutes
Last updated: March 30, 2026
An electricity bill calculator converts device wattage and usage time into energy cost. It helps answer practical questions like how much it costs to keep a PC, AC, or heater running daily.
Electricity billing is based on kWh, so watts and hours must be converted before applying utility rate. This calculator removes that friction and provides a clear cost estimate.
For households and small businesses, quick usage estimates make energy-saving decisions easier and more data-driven.
Frequently asked questions
How do I calculate appliance electricity cost?
Multiply watts by usage hours, divide by 1000 to get kWh, then multiply by your electricity rate.
Can I estimate the cost of leaving a PC on all day?
Yes. Enter your PC wattage, daily runtime, and electricity rate to estimate monthly spend.
What is kWh?
kWh stands for kilowatt-hour and represents energy usage over time, which utilities use for billing.