Electricity Cost Calculator

Electricity Cost Calculator works out how many units of electricity your appliances use in a month and what that costs. One unit on an Indian electricity bill is one kilowatt-hour (kWh): a 1,000-watt appliance running for one hour. List each appliance with its power in watts (on its label or in its manual), the hours a day it runs, and how many you have — the example rows show a typical home with ceiling fans, LED bulbs, a 1.5-ton air conditioner, a television and a washing machine, to replace with your own. Enter the rate per unit from your bill, and any fixed charge, and it gives the month’s units and cost, a daily and yearly figure, and each appliance’s share, largest first, so you can see what is really driving the bill. The arithmetic is exact: watts to a tenth, hours to a hundredth, and the cost in whole paise, rounded once.

1. List your appliances with their watts, hours a day and number.
2. Enter the rate per unit from your bill, and any fixed charge.
3. Check the days in the month.
4. Read the units, the cost and what each appliance adds.

• Tariffs charge in slabs (higher rates as use rises) and add duties and taxes; use your bill’s average rate — the energy charge ÷ the units — for a close figure.
• Appliances with a thermostat (fridge, AC, geyser, iron) switch on and off, so their rating × hours overstates their use.
• An inverter AC uses far less than its rating once the room is cool.
• Everything is worked out in your browser. Nothing is sent anywhere.

Multiply the watts by the hours used and divide by 1000. A 75 W fan for 10 hours uses 0.75 units a day, 22.5 a month.

A non-inverter 1.5 ton AC draws about 1.5–2 kW while the compressor runs: 6 hours a day is roughly 270–360 units a month. Inverter models use less.

On your bill: divide the energy charge by the units consumed for your average rate.

On its rating label or manual. For a fridge, the star label gives kWh a year: divide by 8.76 for its average watts and use 24 hours a day.