Electricity Bill Calculator
Units (kWh) and bill for any appliance
Energy and Cost
Working
- 1,500 W × 8 h ÷ 1,000 = 12 kWh a day
- × 30 days = 360 kWh a month
- × ₹8 = ₹2,880 a month
- 1Enter the wattageIn W, kW or hp
- 2Add hours and daysHow long it runs
- 3Add your tariffSee units and cost
How is electricity cost calculated?
One “unit” on your bill is one kilowatt-hour (kWh): 1,000 watts running for one hour.
kWh = watts × hours ÷ 1,000
Monthly cost = kWh per day × days × rate per unit
Slab tariffs
Most Indian electricity boards charge in slabs: the first units are cheapest and the rate rises as use grows. Fixed charges and taxes are added on top. For a quick estimate, divide your last bill's total by the units used to get your average rate per unit.
Air conditioners and fridges
An AC's compressor and a fridge's motor cycle on and off, so they rarely draw full power all the time. A 5-star inverter AC may use 50–70% of its rated power on average; use that share for a closer estimate.
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Frequently asked questions
How many units does a 1.5 ton AC use?
Roughly 1–1.8 units an hour depending on its star rating and settings, so 8–14 units for 8 hours a night.
How many units does a fan use?
A 75 W ceiling fan uses 0.075 units an hour, about 18 units a month at 8 hours a day. A BLDC fan uses less than half that.
What is the electricity rate per unit in India?
Domestic rates range from about ₹3 to ₹10 per unit depending on your state, board and slab. Check your latest bill.
How do I convert kWh to electricity units?
There's nothing to convert: one unit on an Indian electricity bill is one kilowatt-hour (kWh).
How many watts does a 1.5 ton AC use?
A 1.5 ton AC removes about 5.3 kW of heat, but its electricity use is much lower: roughly 1,100–1,800 W while the compressor runs, depending on the star rating and whether it's an inverter model.
Last reviewed: October 2026