Electricity Unit Calculator
Convert power and operating time into electricity units. Enter watts or kilowatts, the number of identical appliances and a usage schedule to calculate kWh and approximate running costs.
Inputs
For seasonal use, count only days the appliance runs.
Electricity units & cost
Estimated month running cost
30 units (kWh) in 30 usage days| Period | Units (kWh) | Cost |
|---|---|---|
| Usage day | 1 | ₹8.00 |
| Month (30 usage days) | 30 | ₹240.00 |
| Year (365 usage days) | 365 | ₹2,920.00 |
One usage day: 1,000 Wh = 1 kWh. One electricity unit is one kWh.
Running energy cost only. Fixed charges, taxes, subsidies and utility-specific tariff rules are excluded.
How this calculator works
Understand power versus energy
Watts and kilowatts describe the rate of electricity use. A kilowatt-hour describes energy accumulated over time. One electricity unit is one kWh; a 1 kW appliance running for one hour uses one unit.
Choose an appropriate power figure
Use average operating watts for variable loads. Multiplying nameplate power by every plugged-in hour can overestimate refrigerators, inverter ACs and other cycling appliances. Their dedicated calculators offer more appropriate consumption methods.
Scale the schedule explicitly
Quantity multiplies the use of identical appliances. Daily energy uses hours per operating day, monthly energy uses the chosen usage days in that month, and yearly energy uses the chosen annual usage days. Costs assume the entered rate stays constant.
Calculation formulas
kW = Watts ÷ 1,000Daily units (kWh) = kW × Hours × Number of appliancesMonthly / yearly units = Daily units × Monthly / yearly usage daysWorked example
Illustration: three 1,000 W appliances operating for two hours each day use 6 kWh daily. Over 30 usage days they use 180 kWh. At an example ₹8/kWh, the energy cost is ₹1,440 for that month.
Understanding the estimate
All prefilled powers, usage patterns and rates are editable examples. This tool runs locally in your browser. Energy-only estimates are not complete electricity bills, and comparisons are scenarios rather than guaranteed savings.
Frequently asked questions
How many units is 1,000 watts?
It depends on time. A constant 1,000 W load uses 1 kWh, or one unit, in one hour. In half an hour it uses 0.5 units.
Are kW and kWh interchangeable?
No. kW is power; kWh is energy. Multiply power in kW by hours to get kWh.
Can I use this for multiple appliances?
Use quantity for appliances with the same power and schedule. Calculate different appliances separately and add their kWh totals, or use their dedicated calculator when power varies with operating state.