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Electric power is the rate at which an appliance uses electrical energy: P = VI. This calculator works out the power from the voltage and current, then the energy used each day in kilowatt-hours and what it costs at your electricity rate.
One 'unit' on an Indian electricity bill is 1 kWh. Household supply in India is 230 V. Check your appliance's label for its current, or divide its wattage by 230 to estimate it.
| Voltage (V) | 230 V |
| Current (I) | 6.5 A |
| Hours used per day | 8 hours |
| Electricity rate | 8 ₹ per kWh (unit) |
| Power (W) | 1,495 |
| Energy per day (kWh) | 11.96 |
| Energy per 30 days (kWh) | 358.8 |
| Cost per day | ₹95.68 |
| Cost per 30 days | ₹2,870.40 |
| Resistance (Ω) | 35.3846 |
About 1,495 W; running 8 hours a day uses 358.8 kWh a month.
Try this example →| Voltage (V) | 230 V |
| Current (I) | 4.35 A |
| Hours used per day | 0.5 hours |
| Electricity rate | 7 ₹ per kWh (unit) |
| Power (W) | 1,000.5 |
| Energy per day (kWh) | 0.50025 |
| Energy per 30 days (kWh) | 15.0075 |
| Cost per day | ₹3.50 |
| Cost per 30 days | ₹105.05 |
| Resistance (Ω) | 52.8736 |
About 1,000.5 W; half an hour a day uses 15.0075 units a month.
Try this example →P = V × I. Equivalent forms are P = I²R and P = V²/R.
1 kilowatt-hour (kWh): the energy used by a 1,000 W appliance running for 1 hour.
kWh = watts × hours ÷ 1,000. A 100 W bulb for 10 hours uses 1 kWh.
230 V AC at 50 Hz.