This calculator works out conventional, older, BLDC or custom fan running cost. The estimate scales one fan's running watts across quantity and hours, making long daily use more important than a short high-power load. Replace the example values with information from your own label, bill, drawing, product sheet or land record. Read the fan label at the speed normally used; regulators and older motors can change actual input. The formula and every editable assumption remain visible so the result can be checked before it is used for planning. Keep the values and result together when you compare or share this planning scenario.
Enter your details
Every input includes a simple explanation.
Private: calculations run in your browser. Saved scenarios, preferred electricity rate and land state stay on this device.
Choose an illustrative starting point, keep your electricity rate, then replace the wattage and hours with your own fan label and routine.
| Example | Input basis | Monthly energy | Monthly cost | Yearly cost |
|---|---|---|---|---|
| One fan · 6 hours | 35 W × 1 fan × 6 h/day | ₹50.40 | ₹50.40 | ₹604.80 |
| Three fans · 10 hours | 70 W × 3 fans × 10 h/day | ₹504.00 | ₹504.00 | ₹6,048.00 |
| Four fans · 16 hours | 75 W × 4 fans × 16 h/day | ₹1,152.00 | ₹1,152.00 | ₹13,824.00 |
Example wattages are not product ratings.
Each selected fan is assumed to use the same entered wattage.
The energy rate stays editable and should come from your bill.
Use the two actual model wattages to estimate the energy difference and simple payback.
Rated power can be different from average power while the appliance is running.
Voltage, automatic on-off cycling and equipment condition can change real use.
Use this as a budget estimate. The appliance label, how often it runs and all charges on your tariff determine the real bill.
Read the meaning first, verify the important details, then avoid the most common planning error.
The estimate scales one fan's running watts across quantity and hours, making long daily use more important than a short high-power load.
Read the fan label at the speed normally used; regulators and older motors can change actual input.
Using the maximum nameplate wattage for every hour can overstate energy when fans usually run at lower speed.
Updated 19 August 2026. Changes listed here describe this calculator release; they are not invented historical entries.