About electrical energy calculator
Your electricity bill is based on units, and one unit is one kilowatt-hour (kWh). The calculator turns power and hours into energy and cost.
Formula
Energy (kWh) = power in kW × hours. A 1,500 W geyser used for 2 hours uses 3 kWh. At ₹7 a unit, that costs ₹21.
Reducing the bill
- Switch off standby appliances.
- Use efficient lights and star-rated appliances.
- Run heavy appliances for shorter periods.
Tariffs
Many states charge higher rates per unit as consumption goes up. Use the rate printed on your own bill.
Another worked example
A 2 kW room heater used for 3 hours a day for 30 days consumes 2 × 3 × 30 = 180 units. At ₹7 a unit that adds ₹1,260 to the bill. Switching to a more efficient device or using it for an hour less saves 60 units.
Standby power
Devices left on standby can use a few watts all day. Ten devices at 5 W use 36 units a month, so a power strip with a switch pays for itself.
