Electricity Cost Calculator (kWh)
Electricity cost calculator: yearly, monthly and daily running cost of any appliance from its watts, hours of use and price per kWh.
C = P · t · 365 · p
How to use this calculator
- Choose the quantity you want under “Solve for”.
- Type the known values and pick their units: any combination works.
- The result updates as you type. Open “Show the steps” to see the substitution.
kWh = watts ÷ 1,000 × hours. Multiply by your tariff to get the cost.
The US average is around $0.17 per kWh; check your bill for your rate.
Formula
C = P · t · 365 · p
| Symbol | Quantity | Units |
|---|---|---|
| P | Device power | W, mW, kW, MW, hp, PS, BTU/h, kcal/h |
| t | Hours of use per day | — |
| p | Price per kWh | $, €, £ |
| C | Cost per year | $, €, £ |
Worked example
Given: P = 2 000 W · t = 1 · p = 0.30 $
C = P t 365 p
Result: C = 219.00 $
Cost per year for different values of Device power
| P · Device power | C · Cost per year |
|---|---|
| 1 000 W | 109.50 $ |
| 1 500 W | 164.25 $ |
| 1 800 W | 197.10 $ |
| 2 000 W | 219.00 $ |
| 2 200 W | 240.90 $ |
| 2 500 W | 273.75 $ |
| 3 000 W | 328.50 $ |
| 4 000 W | 438.00 $ |
Other values as in the worked example.
Frequently asked questions
A 2,000 W heater used 1 h a day at $0.30/kWh?
730 kWh and $219 a year.
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