Electricity Cost Calculator
Cost equals kilowatt-hours times the rate you type. If kWh is blank, energy is watts times hours times days over 1000. This is not a utility bill.
Rated 4.7 out of 5 based on 441 reviews
How to estimate appliance electricity cost
- Type your price per kilowatt-hour. The page does not load a utility tariff.
- Either enter kWh directly, or leave kWh blank and enter watts, hours, and days.
- Read energy in kWh and cost at that rate.
- Current from watts and volts is a different job on watts to amps. Nothing is uploaded.
Appliance energy cost
kWh times a typed rate
| Kilowatt-hour | 1000 watt-hours |
|---|---|
| Energy from load | watts × hours × days / 1000 |
| Cost | kWh × price per kWh |
| Rate source | The number you type. Not a billed tariff. |
| Typed kWh | Wins over watts when kWh is greater than 0 |
| Not a bill | No fees, taxes, or time-of-use periods |
How kWh and cost are computed
If you enter a kWh value greater than 0, that energy is used. Otherwise kWh is watts times hours times days divided by 1000. Cost is kWh times the rate. Days default to 1 when blank.
Watt, kilowatt-hour, and rate
A watt is a joule per second. A kilowatt-hour is energy. The rate is currency per kWh. For current from power and voltage, open watts to amps. Unit swaps for joules and kWh belong on the energy converter.
Not a utility bill
Real bills add delivery charges, taxes, and sometimes time-of-use prices. This page multiplies energy by one rate you typed. Compare a drive spend on fuel cost. Transfer time at a typed rate is download time.
Use cases
A lamp at 100 W for 8 hours, a space heater nameplate, or a meter reading you already have in kWh. Standby draw and duty cycle are not inferred.
Limits
Rate cannot be negative. If kWh is empty, watts and hours must be greater than 0. Informational only. CZNull does not receive the numbers.