Add your fans, AC, fridge and geyser, enter your ₹ per unit, and see units and cost per day, month and year.
Quick answer
An appliance's units per day = watts × hours used ÷ 1,000. One unit on your bill is one kilowatt-hour (kWh). Multiply by your rate per unit to get rupees. A 75 W ceiling fan running 10 hours uses 0.75 units a day, about 22.5 units a month, or ₹180 a month at ₹8 per unit.
Appliance electricity cost calculator
Add your appliances, set your rate per unit, and see the units and rupees each one uses per day, month and year.
| Appliance | Units / month | ₹ / month | Share |
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Wattages are typical starting values. Replace them with the figure on your appliance's label or BEE star label. Real bills use slab rates plus fixed charges and electricity duty. To find your own average rate, divide the energy charges on your last bill by the units billed.
How this calculator works
- Units per appliance = watts × quantity × hours per day ÷ 1,000.
- Monthly units = daily units × days in the month.
- Cost = units × your rate per unit. The calculator uses one flat rate. Your DISCOM bills in slabs and adds a fixed charge and electricity duty, so treat this as a close estimate rather than your exact bill.
How to find your real rate per unit
Take your last bill. Divide the energy charges by the units consumed. That figure is your average rate, and it already reflects your slab. For a quick total, add your fixed charge and duty on top of the estimate here.
Where to find an appliance's wattage
- On the rating plate or sticker: look for a figure in W or kW.
- On the BEE star label, which shows annual energy use in units for ACs, fridges and some other appliances. Divide by 365 for a daily figure.
- Fridges and inverter ACs cycle on and off. Use their average draw, not the peak figure, as the calculator does by default.
Ways to cut the bill
- A BLDC ceiling fan draws roughly 30 W against about 75 W for a standard fan. Over 10 hours a day, that saves around 13 units a month per fan.
- Set the AC to 24°C. The Bureau of Energy Efficiency recommends 24°C as the default setting.
- Run the geyser for short bursts. A 2,000 W geyser uses 2 units every hour it runs.
Sizing a new AC? Use the AC Tonnage Calculator, and read our How We Review page for how we compare appliances.
FAQs
What is 1 unit of electricity?
One kilowatt-hour: 1,000 W running for one hour, or a 100 W device running for 10 hours.
Why is my bill higher than this estimate?
Bills add a fixed charge, electricity duty and higher slab rates once usage crosses a slab limit. Some states also add fuel or power-purchase adjustment charges.
Does a fridge really run 24 hours?
It stays plugged in all day, but the compressor runs only part of the time. That is why the default is an average draw of about 50 W.