Estimate the energy an appliance uses in kWh and what it costs per day, month and year.
Energy (kWh) = watts × hours ÷ 1,000. Cost = kWh × tariff. A 1,500 W AC running 8 hours a day uses 12 kWh daily — 360 kWh and ₹2,880 over 30 days at ₹8 per unit.
The Electricity Calculator shows how much energy an appliance uses and what it costs. The first tool takes one appliance's power, daily hours, quantity, number of days and your tariff per unit (kWh). The second lets you list several appliances to estimate your monthly units and bill.
It helps you find which appliances drive your bill, compare a new efficient model with an old one, and plan solar or inverter capacity. Your actual bill may include fixed charges, slabs, fuel surcharge and taxes; use the tariff on your bill for the best estimate. Related: Ohm's Law Calculator and AC BTU Calculator.
Electricity is billed in units — one unit is one kilowatt-hour (kWh).
| Appliance | Energy | Cost |
|---|---|---|
| 1.5-ton AC (1,500 W), 8 h a day | 360 kWh | 2,880 |
| 3 ceiling fans (75 W), 10 h a day | 67.5 kWh | 540 |
| 6 LED bulbs (9 W), 6 h a day | 9.72 kWh | 77.76 |
| Water heater (2,000 W), 30 min a day | 30 kWh | 240 |
| Appliance | Typical power |
|---|---|
| LED bulb | 5–12 W |
| Ceiling fan | 60–80 W |
| Laptop | 40–90 W |
| Television (LED) | 50–150 W |
| Refrigerator (average draw) | 100–200 W |
| Washing machine | 400–800 W |
| Iron | 1,000–1,200 W |
| Air conditioner (1.5 ton) | 1,200–1,800 W |
| Water heater (geyser) | 1,500–3,000 W |
Multiply the appliance's power in watts by the hours used, then divide by 1,000 to get kilowatt-hours (units).
One unit is one kilowatt-hour (kWh) — the energy used by a 1,000 W appliance running for one hour.
At about 1,500 W for 8 hours a day, it uses 12 units a day, or 360 a month — ₹2,880 at ₹8 per unit.
Check your electricity bill or your distribution company's tariff schedule. Many states use slab rates that rise with consumption.
Bills include fixed charges, slab rates, surcharges and taxes, and real appliance power varies with load and age.
Look at the rating label. If it shows amps and volts, multiply them (watts = volts × amps).
They run 24 hours, but the compressor cycles on and off, so the average draw is lower than the label rating.
Electricity used by devices that are switched off but plugged in, often 1–10 W each.
List all your appliances in the second calculator with their daily hours — the total gives monthly units and a bill estimate.
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