Electricity bill calculator
Units used and the bill, from your appliances or meter reading.
Estimated monthly bill
₹501
110 units (kWh)
- Units used in a month
- 110 units (kWh)
- 0–100 units at 3.5
- ₹350.00
- 100–200 units at 5
- ₹51.40
- Fixed charge
- ₹100.00
- Estimated bill
- ₹501
Biggest users
- Ceiling fan
- 45 units (kWh) · ₹164
- Refrigerator (average)
- 36 units (kWh) · ₹131
- Television
- 12 units (kWh) · ₹44
Units = watts × hours a day × count × 30 days ÷ 1,000. Each slab’s rate applies only to the units inside that slab. Real use varies with appliance age, star rating and the weather; air conditioners use less once the room is cool.
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How to estimate your electricity bill
- 1
Choose appliances or the units on your bill.
- 2
Set how many of each appliance you have and the hours they run, or enter the units.
- 3
Enter the tariff slabs and fixed charge from your bill.
- 4
See the units, the bill and the appliances that use the most.
Estimate your electricity bill
Find out how many units your home uses and what they cost, before the bill arrives. Either list your appliances with how long they run each day, or enter the units from your meter or last bill. Then enter your tariff, and the calculator works out the bill slab by slab and shows which appliances use the most.
An electricity unit calculator and power consumption calculator: kWh to bill amount.
What is a unit?
One unit is one kilowatt-hour (kWh): a 1,000-watt appliance running for one hour, or a 100 W one running for ten.
Units a month = watts × hours a day × number of appliances × 30 ÷ 1,000
Two 75 W ceiling fans running 10 hours a day use 45 units a month. A 1.5-ton air conditioner at about 1,500 W for 6 hours a day uses about 270.
How slab tariffs work
Most utilities charge more per unit as use goes up, but each rate applies only to the units inside its slab. With an example tariff of 3.5 for the first 100 units, 5 for 101–200, 6.5 for 201–400 and 8 above:
- 250 units = 100 × 3.5 + 100 × 5 + 50 × 6.5 = 350 + 500 + 325 = 1,175
- plus any fixed or meter charge, and duty or tax
Tariffs differ by state and utility in India, and by country in the Gulf. The example rates are only a starting point; enter the slabs from your own bill.
Typical power use
| Appliance | Typical watts |
|---|---|
| LED bulb | 9 |
| Ceiling fan | 50–75 |
| Refrigerator (average over the day) | 40–60 |
| Television | 60–120 |
| Air conditioner (1.5 ton) | 1,200–1,800 |
| Water heater (geyser) | 2,000 |
Ways to cut the bill
- Set the AC to 24–26 °C; each degree cooler adds several per cent to its use.
- Choose 5-star rated appliances and BLDC fans.
- Switch the geyser off after use, and use timers.
- Keep the fridge away from the stove and walls so it runs less.
For the cost of driving, see the fuel cost calculator.
Frequently asked questions
How are electricity units calculated?
One unit is one kilowatt-hour (kWh). Units = watts × hours × days ÷ 1,000. Two 75 W fans running 10 hours a day use 45 units a month.
How do slab tariffs work?
Each slab’s rate applies only to the units inside it. With 3.5 for the first 100 units, 5 for 101–200 and 6.5 for 201–400, 250 units cost 350 + 500 + 325 = 1,175 before fixed charges.
Which appliances use the most electricity?
Air conditioners, water heaters, irons, microwaves and pumps draw the most power. An AC running 6 hours a day can use more than everything else in a home combined.
Why is my real bill different?
Appliance use varies with the weather, age and star rating, and tariffs differ by state and utility. Enter the rates from your own bill for the closest estimate.