Electricity Bill Calculator
Estimate your monthly and yearly electricity bill from each appliance's wattage, usage hours and your tariff. Add appliances to total your power costs.
Rate per kilowatt-hour (kWh) on your bill — e.g. 6-8 ₹/kWh is common.
Estimated bill / month
₹3,053
469.62 kWh / month
Estimated bill / year
₹36,630
Average usage
15.65 kWh / day
Per-appliance breakdown
| Appliance | Power (W) | kWh/day | kWh/month | Cost / month |
|---|---|---|---|---|
| Air conditioner (1.5 ton) | 1,500 | 12 | 360 | ₹2,340 |
| Refrigerator | 150 | 3.6 | 108 | ₹702 |
| LED bulb | 9 | 0.05 | 1.62 | ₹10.53 |
| Total | 15.65 | 469.62 | ₹3,052.53 |
Estimate only. Uses a flat ₹6.5/kWh tariff; most utilities add taxes, fuel-adjustment charges and slab pricing on top of the energy charge. Check the wattage sticker on each appliance rather than guessing.
How it works
Slab billing: 0–100 @ ₹3.50, 100–200 @ ₹4.50, 200–400 @ ₹6.50, 400+ @ ₹8.00 per unit + fixed charge.
Example: 250 units → ₹1,300 energy charge + ₹100 fixed.
Last updated: July 2026
How this calculator is verified
Checked by True Calculator automated test suite on
- Formula verified against a published worked example in the automated test suite
- Edge cases (zero, negative, boundary and unit-mismatch inputs) covered by unit tests
The full verification method is on our how we verify page. Found an error? Tell us and we will re-check it.
When to Use This Calculator
Electricity billing in India runs on progressive slabs, and this calculator reproduces that structure from your meter reading or last bill's unit count. Households use it to estimate the month's bill before it arrives, check whether a billed amount looks correct, and see how adding an air conditioner changes the slab and therefore the total. Since states like Delhi, Maharashtra, Karnataka and Tamil Nadu set their own rates and fixed charges, the tool explains how the slab method works and lets you enter your state's figures. Students and hostel wardens use it to apportion bills fairly when meters are shared, and shopkeepers compare domestic and commercial slabs before changing a connection type. Comparing the estimate with the previous bill also catches meter errors early.
How to Use This Calculator
- Step 1: Enter the number of units (kilowatt-hours) consumed in the month, taken from your electricity meter reading or previous bill.
- Step 2: Select your connection type, domestic or commercial, since the two have different slab structures.
- Step 3: Read the energy charge, which is computed by applying the slab rate to each band of units consumed.
- Step 4: Check the fixed charge and total on the result, then compare the estimate with your last bill to spot large deviations.
Worked Example
Using the tool's default slab rates, a household consuming 320 units in a month pays ₹3.50 per unit for the first 100 units (₹350), ₹4.50 per unit for the next 100 (₹450) and ₹6.50 per unit for the remaining 120 (₹780). The energy charge is ₹1,580, plus a fixed charge of ₹100, making the estimated bill ₹1,680. States set their own slab rates and fixed charges, so treat this as a planning figure and compare it with your last bill before assuming it is exact.
Tips and Common Mistakes
- •Tip 1: Read the meter on the same date every month and enter the actual units consumed, not the estimated units some utilities print.
- •Tip 2: In summer, cross-check the estimate against the previous year's bill for the same month, since air-conditioner usage skews consumption.
- •Tip 3: If your state charges a fuel adjustment cost (FAC) or electricity duty on top, add those line items to the estimate manually.
- ✗Mistake 1: Entering the previous meter reading instead of the units consumed, which can make the bill appear several times too small.
- ✗Mistake 2: Assuming one slab rate applies to all units, when progressive slabs mean the price per unit rises as consumption crosses each band.
Frequently Asked Questions
How is the electricity bill calculated in India?
Bills use slab rates: cheaper per-unit rates for the first 100 units and progressively higher rates above that, plus a fixed monthly charge. This calculator uses typical Delhi-style slabs.
How many units does an Indian home use?
A small 1-BHK uses roughly 100–200 units monthly; a 3-BHK with AC can use 500–800 units in summer.
Why is my actual bill different from this estimate?
Tariffs vary by state, connection type, season and subsidies. Energy duty and fuel adjustment charges can also add 5–10%.
What is one unit of electricity?
One unit is one kilowatt-hour (kWh) — running a 1,000-watt appliance for one hour. A 1,500 W air conditioner for 8 hours uses 12 units a day.
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