Electricity Bill Calculator (units per appliance)
See how many units and rupees an AC, geyser, cooler or motor uses in a month. Enter watts, hours per day and your rate per unit.
Quick answer
1,500 W, 6 h a day, 30 days, ₹8/unit: ₹2,160.
How it is calculated
- Units (kWh) = watts × hours × days ÷ 1,000 = 1,500 × 6 × 30 ÷ 1,000 = 270.
- Bill = units × rate = 270 × 8.
- The wattage is printed on the appliance label or box.
Worked example
A 1.5 kW (1,500 W) AC runs 6 hours a day for 30 days. It uses 270 kWh; at ₹8 a unit the bill is ₹2,160.
| Power | 1,500 watt |
| Hours per day | 6 h |
| Days | 30 |
| Rate per unit | ₹8 |
| Bill | ₹2,160 |
| Units | 270 kWh |
Formula
un = W×Hr×Dy/1000 Bill = un×Rt Units = un
Good to know
- An AC compressor does not run at full power all the time, so real units are often lower.
- Unit rates change by slab; check the rate on your electricity bill.
Questions people ask
What is 1 unit of electricity?
1 unit = 1 kWh: a 1,000 W appliance running for 1 hour.
How many units does a 100 W bulb use in 10 hours?
100 × 10 ÷ 1,000 = 1 unit.
How do I estimate the whole house?
Work out each appliance and add them up.
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Updated 13 Nov 2026 · Desktop N Calculator v1.2.0