This electricity cost calculator turns an appliance's power draw and daily usage into monthly and yearly bills.
Everyday life
Electricity Cost Calculator
Estimate the cost of running electric devices.
Calculator
About this calculator
Formula notes
daily kWh = watts × hours / 1000; cost = kWh × price per kWh; scale to 30 days or 365 days.
Worked examples
- Example: a 2000 W heater used 3 h/day at 0.15/kWh costs 2000×3/1000 = 6 kWh/day = 0.90/day ≈ 27/month.
- A 1.5 kW heater used for 4 hours consumes 6 kWh; at $0.25 per kWh, the energy charge is $1.50.
How to use it
- Enter the appliance power in watts.
- Enter hours used per day and your price per kWh.
- Read daily, monthly, and yearly costs.
Frequently asked questions
Where do I find the wattage?
On the appliance label or spec sheet; some list amps — multiply by voltage for watts.
Why is my bill higher than the estimate?
Standby loads, tiered pricing, and taxes add beyond simple watt × hour math.
Limits and interpretation
- Nameplate power can differ from measured average draw because thermostats, duty cycles, and operating modes switch loads on and off.
- Bills may include tiered or time-of-use rates, taxes, demand charges, and fixed fees that a single unit price omits.