Electricity Cost Calculator
Work out what an appliance costs to run — watts, hours and your tariff.
The Electricity Cost Calculator estimates what any appliance costs to run: pick from 15 common appliances (fridge, TV, PC, AC, dryer…) or enter any wattage, set the daily hours and your electricity rate, and read the daily, monthly and yearly cost.
The math is simple once you know the numbers: kilowatt-hours = watts ÷ 1000 × hours, and cost = kWh × your rate. A 3,000 W dryer run an hour a day at $0.15/kWh costs about $13.50 a month — the kind of figure that makes energy choices concrete. Comparing appliances side by side shows exactly where your bill goes.
Rated wattage is an estimate — fridges cycle on and off, TVs dim with content — so treat results as planning figures. Time-of-use tariffs can make the same kWh cost very different by hour. Runs entirely in your browser.
Daily usage
1.20 kWh
150 W × 8 h
Daily cost
$0.18
Cost over 30 days
$5.40
36.0 kWh total
Yearly (365 d)
$65.70
Estimates use rated power — real draw varies (fridges cycle, TVs dim with content). Check your bill for the actual $/kWh rate, which can change by time of day on TOU tariffs.
How to use the Electricity Cost Calculator
- Pick an appliance from the presets or choose 'Custom' and enter its wattage.
- Enter how many hours per day it runs.
- Set the billing period in days (30 is a typical month).
- Enter your electricity rate in $/kWh (find it on your bill).
- Read daily, period and yearly costs.
Frequently asked questions
How is electricity cost calculated?
Cost = (watts ÷ 1000) × hours × rate. A 1,000 W appliance running 1 hour uses 1 kWh; at $0.15/kWh that is 15 cents. The calculator handles any wattage, duration and rate combination.
Where do I find my electricity rate?
On your utility bill — look for 'price per kWh', often split into supply and delivery charges that you add together. Time-of-use plans charge different rates by hour, which this flat-rate tool does not model.
Why is my bill higher than the sum of appliances?
Base fees, heating/cooling, water heating and standby draw (electronics in sleep mode) add up beyond listed appliances. Vampire load from always-on devices typically totals 5–10% of a home's bill.
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