Electricity Cost Calculator
Total cost —
Energy used —
Cost per day —
Check your device's rated wattage (often printed on it or its power supply) and your utility bill's per-kWh rate for accurate results — both vary a lot between devices and locations.
Free electricity cost calculator — enter a device's wattage, how long you run it, and your per-kWh rate to see exactly what it costs to run, per day and in total.
How it works
- Enter the device's power in watts, hours used per day, and number of days
- Enter your electricity rate in dollars per kWh (from your utility bill)
- See the total cost, energy used in kWh, and cost per day
Frequently asked questions
Where do I find a device's wattage?
It's usually printed on the device itself, its power adapter, or in its manual/spec sheet — look for a number followed by "W" or "watts".
Where do I find my electricity rate?
Check your utility bill — it's usually listed as a price per kWh (kilowatt-hour). Rates vary significantly by location and time of use.
Related tools
From the blog
Update history
- 2026-09-02 Launched: electricity cost calculator for total cost, energy used (kWh), and cost per day from wattage, usage time, and rate. Entirely client-side.