Electricity Bill Calculator
Estimate how much energy an appliance uses and what it costs to run.
W
hours
days
per kWh
- 1
Convert to kilowatts
1,500 ÷ 1 000 = 1.5 - 2
Energy used
1.5 × 5 × 30 = 225kW × hours/day × days = kilowatt-hours consumed. - 3
Total cost
225 × 0.15 = 33.75
Formula
How this is calculated
Four inputs drive the result. Appliance power is the device's draw in watts (W); usage per day is the hours it runs each day; number of days is the length of the billing window; and electricity rate is what your utility charges per kilowatt-hour (kWh) in your own currency.
The calculator first converts watts to kilowatts by dividing by 1,000, then multiplies by hours per day and by the number of days to get total energy: kWh = (W ÷ 1000) × hours × days. Multiplying that energy by your per-kWh rate gives the total cost, and dividing the cost back by the number of days yields the cost per day shown alongside it.
It assumes the appliance draws its rated wattage steadily for every hour entered, so it is an estimate. Real draw varies — motors and thermostats cycle on and off, and standby modes pull less. It also excludes fixed service charges, taxes, and tiered or time-of-use rates, so enter your average effective rate for the closest figure.
About this calculator
Electricity is billed per kilowatt-hour (kWh) — the energy of a 1,000-watt device running for one hour. To find an appliance's consumption, convert its wattage to kilowatts (divide by 1,000), multiply by the hours it runs each day, then by the number of days. Multiplying that energy by your tariff gives the cost over the period.
Look for the wattage on the appliance's rating label or in its manual. Devices with heating elements or motors — heaters, ovens, air conditioners, kettles — draw the most and dominate a bill, while electronics on standby still sip small amounts continuously. Comparing the kWh of different appliances reveals where your money actually goes.
Frequently asked questions
A kilowatt-hour is the energy used by a 1,000-watt appliance running for one hour. It is the unit your utility bills you in.
Check the rating label, nameplate or manual. If only amps and volts are listed, watts = volts × amps.
It appears on your utility bill, usually as a cost per kWh. Enter that figure in the rate field.
Also known as
TG we-Calculate Editorial Team. (2026). Electricity Bill Calculator [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/electricity-bill-calculator
TG we-Calculate Editorial Team. "Electricity Bill Calculator." TG we-Calculate. 2026. https://we-calculate.com/calculator/electricity-bill-calculator.
TG we-Calculate Editorial Team, "Electricity Bill Calculator," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/electricity-bill-calculator
@misc{wecalculate_electricity_bill_calculator, title = {Electricity Bill Calculator}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/electricity-bill-calculator}}, year = {2026}, note = {TG we-Calculate} }
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