Electricity Cost Calculator (Appliance Energy Use)
How much does it cost to run this appliance per day, month and year?
Single calculationv1.0.0Verified 2026-11-01Runs in your browser
Spec sheet
kwh_cost · v1.0.0Method
kWh × rate
- 01
kWh/day = watts × hours ÷ 1000 - 02
cost = kWh × rate
Limits — read before relying on it
- Uses rated wattage; many appliances cycle and draw less on average.
- Flat rate; time-of-use and tiered tariffs differ.
Sources
- Energy = power × timeformula
Worked example
computed by the same formula1,500 W heater, 3 h/day
Inputs
- Power draw
- 1500 W
- Hours used per day
- 3 h
- Days used per month
- 30
- Electricity rate
- 0.17
Result
- Cost per month
- $22.95
- Cost per day of use
- $0.77
- Cost per year
- $275.40
- Energy per month
- 135 kWh
Questions
How is the electricity cost calculator calculated?
›
kWh × rate. kWh/day = watts × hours ÷ 1000 · cost = kWh × rate
Example: 1,500 W heater, 3 h/day?
›
Cost per month: $22.95; cost per day of use: $0.77.
What does this calculator not cover?
›
Uses rated wattage; many appliances cycle and draw less on average. Flat rate; time-of-use and tiered tariffs differ.
Where do the numbers come from?
›
Sources: Energy = power × time. The formula is versioned (kwh_cost v1.0.0) and covered by automated tests.
Is my data stored?
›
No. The calculation runs in your browser and nothing is sent unless you choose to save a shareable link.
Also searched aselectricity cost calculator · how much does it cost to run · appliance energy cost · kwh cost calculator · space heater cost per month