Free Electricity Cost Calculator
Work out what an appliance costs to run, per day, month, and year — no signup, nothing sent to a server.
Per day
—
Per month
—
Per year
—
Energy used per day: —
How to use the electricity cost calculator
-
1
Enter the power rating
Type the appliance's wattage, found on its label or spec sheet.
-
2
Enter hours used per day
Type roughly how many hours a day the appliance runs.
-
3
Enter your electricity rate
Type the per-unit (kWh) rate from your electricity bill.
-
4
Read the result
Daily, monthly, and yearly running cost update instantly as you type.
Example use cases
Appliance running costs
Check what an AC, heater, or fridge actually costs to run.
Comparing appliances
Compare yearly running costs before buying a new appliance.
Budgeting electricity bills
Estimate how much of your bill comes from a specific device.
Frequently asked questions
How is electricity cost calculated?
Energy used (kWh) = (watts ÷ 1000) × hours used. Cost = energy used × your electricity rate per kWh (unit).
Where do I find an appliance's wattage?
It's usually printed on a label on the appliance itself, in the manual, or on the manufacturer's product page — often listed as "W" or "watts".
What does "per kWh" or "unit" mean on my electricity bill?
A kilowatt-hour (kWh), commonly called a "unit" on Indian electricity bills, is the amount of energy used by a 1000-watt device running for one hour.
Is anything I type sent to a server?
No. Every calculation runs entirely in your browser — nothing is transmitted or logged.