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BLDC Fan Savings Calculator

This calculator works out savings based only on entered conventional and BLDC wattages. Savings are the difference between the entered old and BLDC wattages over your own operating hours; payback is a simple, undiscounted comparison. Replace the example values with information from your own label, bill, drawing, product sheet or land record. Compare measured or manufacturer-rated power at equivalent airflow and include installation or regulator replacement in the real upgrade cost. 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.

Updated 17 July 2026Use for planningFormula and steps shown

Enter your details

Your values

Every input includes a simple explanation.

Simple wordsFormula shownPrivate inputs

Simple viewUsing editable example assumptions for technical settings.

Existing fan powerUser-entered value — example shownThe electricity used by one existing fan while it runs.

BLDC fan powerUser-entered value — example shownThe electricity used by one new BLDC fan while it runs.

Fans replacedUser-entered value — example shownHow many identical appliances, elements, fans, or slabs you want to include.

fans

Daily operating timeUser-entered value — example shownThe number of hours represented by the field label in this calculator, such as daily use or desired backup time.

hours

Electricity rateUser-entered value — example shownThe price of one electricity unit from your own bill.

₹/kWh

Helpful tip: Enter the energy rate from your bill. ₹8 is only an example you can change.Replacement cost per fanUser-entered value — example shownThe purchase and installation amount for replacing one fan.

₹

Private: calculations run in your browser. Saved scenarios, preferred electricity rate and land state stay on this device.

Your result

Estimated monthly saving

₹115.20

Savings come only from the wattages and usage entered—not a universal percentage claim.

Energy saved14.4 kWh/month

Annual saving₹1,382.40

Simple payback30.4 months

Five-year saving after purchase₹3,412.00

How this was calculated

Formula used

Energy (kWh) = watts × quantity × hours × days × operating factor ÷ 1,000

Your values in the formula

(75 W − 35 W) × 1 × 12 h × 30 ÷ 1,000 × ₹8.00 = ₹115.20

Assumptions and rounding

Usage is assumed constant across both fan types.
Maintenance and time value of money are excluded.

Use this as a budget estimate. The appliance label, how often it runs and all charges on your tariff determine the real bill.

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How to use this calculator

Step 1. Read the appliance label or product sheet for watts, then enter how long it runs.
Step 2. Use the rate or bill details that apply to your own connection; an example is not a tariff.
Step 3. Compare the result with a real bill and check non-energy charges separately.

What can change the answer

Check these details

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.

Understand your result

What this answer means

Read the meaning first, verify the important details, then avoid the most common planning error.

What it means

Savings are the difference between the entered old and BLDC wattages over your own operating hours; payback is a simple, undiscounted comparison.

What to check next

Compare measured or manufacturer-rated power at equivalent airflow and include installation or regulator replacement in the real upgrade cost.

Common mistake

Do not compare two fans at unequal speed or assume the example replacement price is a market quotation.

Sources and method

Sources used for this calculator

Standards & Labelling ProgrammeBureau of Energy Efficiency, Government of IndiaUsed to explain why the model label is the preferred source for appliance energy information. No star-rating consumption figures are invented. Reviewed 2026-07-16.Documented dimensional-analysis formulasGharGanit editorial methodologyFormulas are derived from units and expose every editable efficiency, density, dry-volume and wastage assumption. Reviewed 2026-07-16.

Official verification links

Check the official context

These independent government and standards resources help you verify the inputs or decision. Inclusion is not an endorsement.

BEE Standards & Labelling programmeBureau of Energy Efficiency, Government of IndiaUnderstand appliance star labels and the energy information shown on them.Open official resource BEE appliance check-testing processBureau of Energy Efficiency, Government of IndiaSee how registered appliance performance claims are checked for compliance.Open official resource BEE star-label QR and mobile toolsBureau of Energy Efficiency, Government of IndiaVerify model information from the label database instead of guessing from star count.Open official resource

Browse all 72 verified links

Learn before deciding

Useful next reading

Read the electricity bill guide Understand bill charges Check a worked AC example Read a BEE AC label Compare AC tonnage and input watts Compare inverter and fixed-speed ACs

Calculator revision

Version 1.1

Updated 17 July 2026. Changes listed here describe this calculator release; they are not invented historical entries.

Added category-specific instructions and default-value origin labels.
Added device-local scenario saving and a direct issue-report workflow.

Read the correction process