Electricity Cost Calculator
Estimate an appliance’s daily and annual electricity use and cost.
Result
Estimated annual cost: $700.80Estimate
This assumes the appliance draws its stated power for every hour entered. Cycling, standby use, variable loads and tiered tariffs can change the bill.
- Annual electricity use
- 4,380 kWhEstimate
- Average monthly cost
- $58.40Estimate
- Cost per day used
- $1.92Estimate
https://calcgallery.com/energy-utilities/electricity-cost-calculator/
Results are estimates based on the ratings, usage and prices you enter. Actual consumption, losses, tariffs and equipment performance vary. Check your bill, meter and manufacturer information before relying on the result. Read the full disclaimer
How to use the Electricity Cost Calculator
- Enter the power shown on the appliance label and how many hours it runs on a day it is used.
- Enter the number of use days, the number of identical appliances and your electricity price per kWh.
- Compare the daily, average monthly and annual cost with the annual energy use.
From watts to a utility cost
Watts measure power, while a bill charges for energy. Time connects them: watts multiplied by hours gives watt-hours, and 1,000 watt-hours is one kilowatt-hour.
annual kWh = watts × hours per day × days × quantity ÷ 1,000annual cost = annual kWh × price per kWhThe price field keeps fractional cents. A tariff of 15.7 cents per kWh is calculated as 0.157, not rounded to 0.16 before multiplication. Only the final currency amount is rounded.
The relationship follows the U.S. Energy Information Administration explanation of electricity measurement and unit conversions follow NIST SP 811.
With your numbers
- Energy = 1,500 W × 8 hours × 365 days × 1
- Annual use = 4,380 kWh
- Annual cost = 4,380 kWh × $0.16 per kWh = $700.80
Quick reference
This assumes the appliance draws its stated power for every hour entered. Cycling, standby use, variable loads and tiered tariffs can change the bill.
| Example | Estimated annual cost |
|---|---|
| 1,500 W heater, 8 hours daily | $700.80 |
| 100 W lamp, 4 hours daily | $23.36 |
| Ten 9 W lamps, 3 hours daily | $15.77 |
| 2 kW appliance, 30 days | €30.00 |
| 50 W fan, 12 hours daily | €43.80 |
| 5 W standby load all year | €13.14 |
Common questions about the Electricity Cost Calculator
- Where do I find the wattage?
- Check the rating plate, manual or manufacturer specification. For a variable-load appliance, a plug-in meter gives a better average than the maximum label rating.
- Why does this differ from my bill?
- A bill can include fixed charges, taxes, tiered rates and time-of-use prices. This calculator extends one price per kWh and does not add those items.
- Does an appliance always draw its rated watts?
- No. Heaters may cycle, motors vary with load and electronics use standby power. Treat the result as an estimate unless the entered power is measured average demand.