Add Appliances
Appliance
Watts
Hrs/Day
Qty
Electricity Usage & Bill
Daily Usage---
Monthly Usage---
Estimated Monthly Bill---
Annual Cost---
Calculate electricity units (kWh) and monthly bill
Electricity is billed in units of kWh (kilowatt-hours). One unit (1 kWh) means using 1000 watts for 1 hour. Understanding your appliance consumption helps reduce bills.
units = watts × hours ÷ 1000. A 1.5-ton split AC drawing 1,500 W for 8 hours uses 12 units in a night, which is roughly what a ceiling fan uses in a fortnight.| Appliance | Typical watts | Units per hour | Units in a 30-day month |
|---|---|---|---|
| LED bulb (9 W) | 9 | 0.009 | 1.1 at 4 hrs/day |
| Ceiling fan | 70 | 0.07 | 16.8 at 8 hrs/day |
| Tube light | 20 | 0.02 | 2.4 at 4 hrs/day |
| LED TV, 43″ | 80 | 0.08 | 9.6 at 4 hrs/day |
| Laptop | 65 | 0.065 | 15.6 at 8 hrs/day |
| Refrigerator, 250 L (5-star) | 150 running | — | 30–45 (compressor cycles) |
| Air cooler | 200 | 0.20 | 48 at 8 hrs/day |
| Washing machine | 500 | 0.50 | 10 at 20 loads |
| Mixer grinder | 500 | 0.50 | 2 at 8 min/day |
| Iron | 1000 | 1.00 | 7.5 at 15 min/day |
| Microwave | 1200 | 1.20 | 9 at 15 min/day |
| Induction cooktop | 1800 | 1.80 | 54 at 1 hr/day |
| Split AC, 1.5 ton (5-star inverter) | 1100–1500 | 1.1–1.5 | 264–360 at 8 hrs/day |
| Window AC, 1.5 ton | 1700–1900 | 1.7–1.9 | 408–456 at 8 hrs/day |
| Geyser, 25 L | 2000 | 2.00 | 30 at 30 min/day |
| Water pump, 0.5 HP | 375 | 0.375 | 11 at 1 hr/day |
Estimating a monthly bill
4 LED bulbs × 5 hrs = 0.18 units/day
3 fans × 10 hrs × 70 W = 2.1 units/day
Fridge = 1.2 units/day
TV + laptop + router = 0.9 units/day
1 AC × 6 hrs × 1,300 W = 7.8 units/day
Geyser + iron + kitchen = 1.8 units/day
Daily total ≈ 14 units → 420 units for the month
At a blended tariff of around ₹8 per unit including fixed charges and duty, that is roughly ₹3,400 a month — and the AC alone is two-thirds of it.
Indian DISCOMs bill on telescopic slabs: the first block of units is charged at the lowest rate, the next block at a higher rate, and so on. Only the units inside each block are charged at that block’s rate — crossing into a higher slab does not reprice your earlier units. On top of the energy charge every bill carries a fixed charge (per sanctioned kW), an electricity duty set by the state, and often a fuel-surcharge adjustment that moves month to month. Slab boundaries and rates are set by each state regulator and change annually, so read the rate table printed on your own bill rather than assuming a national figure.
One unit is one kilowatt-hour: an appliance drawing 1,000 watts for one hour. A 100-watt device running for ten hours also consumes exactly one unit.
A 5-star inverter 1.5-ton split AC draws roughly 1,100–1,500 watts, so 1.1–1.5 units per hour of compressor running time. A 3-star window unit of the same tonnage is closer to 1.8 units per hour.
Take the current meter reading, subtract last month’s reading to get units consumed, apply your state’s telescopic slab rates to that number, then add the fixed charge for your sanctioned load, electricity duty and any fuel surcharge.
Yes, though modestly. Standby draw in a typical Indian home adds up to 15–30 units a month, mostly from set-top boxes and older TVs. It is worth a switchable power strip for the entertainment corner, not worth unplugging your fridge.
The three usual causes are a revised tariff order from the state regulator, a fuel-surcharge adjustment that varies month to month, and an estimated rather than actual meter reading — check whether your bill says "assessed" or shows a real reading with a photo.
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