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Ceiling Fan Running Cost Calculator: What a BLDC Fan Really Saves
What will a BLDC fan actually save you?
A BLDC ceiling fan costs more to buy and less to run. Put your own tariff and hours in and this works out how long it takes to get the difference back.
An old induction fan is 70-80 W; a current one 50-55 W.
BLDC fans on this site run 25-45 W.
210 days is a seven-month Indian summer.
Saves ₹948 a year · pays back in 1.9 years
₹1,512 a year now (189 units) against ₹564 a year on 28 W (71 units).
Over ten years — about what a ceiling fan lasts — you are ₹7,675 ahead after paying the ₹1,800 price difference.
Assumptions: units are watts × hours × days ÷ 1,000, costed at your tariff. Defaults are ₹8 a unit, 12 hours a day and 210 days a year, the same figures used on every fan page on this site, so the number here matches the annual cost printed on a product card. This counts electricity only — it ignores the regulator losses an old induction fan also suffers, so the real saving is usually a little larger than shown.
| Fan type | Power | Units a year | Cost a year |
|---|---|---|---|
| Old induction fan | 75 W | 189 | ₹1,512 |
| Current induction fan | 50 W | 126 | ₹1,008 |
| Entry BLDC fan | 35 W | 88 | ₹706 |
| Efficient BLDC fan | 28 W | 71 | ₹565 |
| Lowest verified BLDC | 25 W | 63 | ₹504 |
Ceiling fan marketing talks about RPM, blade design, copper motors and “power saving technology”. None of it changes your bill. Electricity is billed in units, a unit is a kilowatt drawn for an hour, and the only input is the watts the fan draws. A fan that claims to save power and draws 75 W does not save power. That is why every fan on this site carries its published input power, and why nothing appears on our energy saving page unless the manufacturer publishes a figure of 35 W or less. Of the 384 ceiling fans verified here, only 179 publish wattage at all — if a brand will not tell you, read the BEE label on the box before you pay.
Payback depends on hours, so the fans worth replacing first are the ones that run longest: the bedroom fan that runs all night and the hall fan that runs all evening. A guest-room fan used three weeks a year will never pay back, whatever the brochure says. In an office or a shop the arithmetic is far stronger, because the fans run eight to ten hours a day for 250 days — twenty 75 W fans cost about ₹30,000 a year at ₹8 a unit, where twenty 28 W fans cost about ₹11,200, so the upgrade clears its cost inside the second year.
One thing this calculator deliberately leaves out: it counts the fan only. An old induction fan on a conventional resistive regulator also wastes power in the regulator itself when it runs at reduced speed, and that loss never reaches the blades. Because it varies with the regulator, we do not estimate it — which means the real saving from moving to a BLDC fan is usually a little larger than the figure above, never smaller.