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Electricity Bill Calculator

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Calculate your monthly electricity bill in India. Enter your units consumed and state tariff slab to get bill amount, per-unit cost, and monthly savings tips.

Reviewed by the thecalcu.com team · Last updated 13 July 2026

🇮🇳This tool is specific to India
Monthly Units Consumed
kWh
0 kWh2000 kWh

Approximate slab rates. Actual rates may vary — check your DISCOM website.

Fixed / Demand Charge
₹
₹0₹500
Fuel Surcharge Adjustment
₹/kWh
0 ₹/kWh2 ₹/kWh

Total Monthly Bill

₹0
Energy Charge
₹0
Effective Rate (₹/kWh)
0
Average Daily Cost
₹0
Estimated Annual Bill
₹0

What is a Electricity Bill?

An Electricity Bill Calculator computes your monthly electricity bill based on units consumed, your state's tiered tariff slabs, the fixed charge, and the fuel surcharge adjustment. In India, electricity pricing is not a flat rate, it uses a telescopic slab system where the per-unit rate increases as consumption rises, with each slab's rate applying only to the units consumed within that band.

This calculator covers approximate tariff structures for five major states, Maharashtra (MSEDCL), Delhi (BSES/TPDDL), Karnataka (BESCOM), Tamil Nadu (TANGEDCO), and Uttar Pradesh (UPPCL), plus a generic Indian residential structure. A generic slab is also available for other states.

Key components of an Indian electricity bill:

  • Energy charge, the main variable charge, computed via slab billing
  • Fixed/demand charge, flat monthly fee regardless of consumption
  • Fuel Surcharge Adjustment (FSA), variable quarterly charge for fuel cost recovery
  • (Taxes and duties vary by state, not included here)

For solar panel savings estimation, compare your current bill against zero units for the portion covered by solar generation. See the Compound Interest Calculator for calculating return on solar investment.

Why Use an Electricity Bill Calculator?

Electricity bills confuse most Indian consumers because of the slab structure. Many people assume all units are billed at the same rate, they're not. A household that consumes 250 units does not pay 250 × ₹7.54 (MSEDCL middle slab rate). They pay: 100 × ₹3.78 + 150 × ₹7.54 = ₹378 + ₹1,131 = ₹1,509 in energy charges alone.

This calculator makes the slab calculation transparent and helps you:

  • Verify your DISCOM's bill before paying
  • Estimate how much saving 30–50 units by switching to LED lights or inverter ACs will actually reduce your bill
  • Compare bills under different consumption scenarios (summer AC vs. no AC)

Who Should Use This Calculator?

Homeowners and tenants who want to understand and verify their monthly electricity bills, especially during summer months when AC usage spikes consumption into higher slab bands.

Landlords who include electricity in rent and need to accurately calculate the cost for sub-metered units in PG accommodations or rented apartments.

Solar panel evaluators comparing current grid bill against expected solar generation to estimate payback period on a rooftop installation.

Housing society managers computing bulk electricity costs and sub-metering residents accurately.

Students and professionals doing energy audits or sustainability projects who need to model residential electricity costs for Indian consumers.

How to use this Electricity Bill calculator

  1. Enter your monthly units consumed, find this on your electricity bill or calculate by subtracting two consecutive meter readings.
  2. Select your state/tariff for approximate slab rates. Note: these are representative rates as of 2024–25; actual current rates may differ, check your DISCOM's latest tariff order.
  3. Adjust the fixed charge to match the amount shown on your bill (typically ₹50–200/month).
  4. Set the fuel surcharge per unit (check your latest bill; typically ₹0.10–0.50/kWh).
  5. The result shows energy charge, total monthly bill (highlighted), effective rate per unit, daily cost, and annual estimate.

Formula & Methodology

Slab billing (telescopic):
Energy charge = Σ (units in slab × slab rate) Total bill    = Energy charge + Fixed charge + (Units × Fuel surcharge) Effective rate = Total bill ÷ Units consumed

Worked example, 250 units, Maharashtra (MSEDCL), fixed ₹100, FSA ₹0.15/unit:
Slab 1: 100 units × ₹3.78 = ₹378 Slab 2: 150 units × ₹7.54 = ₹1,131 Energy charge = ₹1,509 Fixed charge  = ₹100 Fuel surcharge = 250 × ₹0.15 = ₹37.50 Total bill    = ₹1,509 + ₹100 + ₹37.50 = ₹1,646.50 Effective rate = ₹1,646.50 ÷ 250 = ₹6.59/kWh

Approximate residential tariff summary (2024-25):

| State | Slab 1 | Slab 2 | Slab 3 |
|---|---|---|---|
| Maharashtra | ₹3.78 (0–100) | ₹7.54 (100–300) | ₹9.83 (300–500) |
| Delhi | ₹3.00 (0–200) | ₹4.50 (200–400) | ₹6.50 (400–800) |
| Karnataka | Free (0–30) | ₹4.10 (30–100) | ₹5.55 (100–200) |
| Tamil Nadu | Free (0–100) | ₹1.50 (100–200) | ₹3.00 (200–400) |
| UP | ₹5.50 (0–150) | ₹6.00 (150–300) | ₹6.50 (300–500) |

Rates are approximate. Verify with your DISCOM's latest tariff order.

Frequently Asked Questions

Indian electricity bills use a tiered slab system where the per-unit rate increases as you consume more. Units consumed in the first slab (e.g., 0–100 units) are charged at the lowest rate; additional units in each subsequent slab are charged at higher rates, only the units in that slab, not all units. The total bill = energy charge (slab calculation) + fixed/demand charge (a monthly flat fee) + fuel surcharge adjustment (FSA) + government taxes/duties.
One unit of electricity = 1 kilowatt-hour (kWh) = using 1,000 watts for 1 hour, or 100 watts for 10 hours. Typical consumption: a 1.5-tonne split AC on for 8 hours/day uses about 40–50 units/month; a 5-star 70L refrigerator uses about 20–25 units/month; a 50W LED TV for 5 hours/day uses about 7–8 units/month; a washing machine (6 washes/month) uses about 5–6 units/month. Add all appliances to estimate your total monthly units.
The fixed charge (also called demand charge or customer charge) is a flat monthly fee charged regardless of how many units you consume, it covers the DISCOM's infrastructure costs (poles, wires, meters). In Maharashtra (MSEDCL), the fixed charge for LT residential consumers is ₹75–200/month depending on sanctioned load. In Delhi, it is ₹20/kW/month. In Karnataka (BESCOM), it ranges from ₹30–70/month. This calculator includes a fixed charge input (default ₹100/month) that you can adjust to your bill.
Fuel Surcharge Adjustment (FSA) is a variable per-unit charge added to electricity bills to recover the cost of expensive fuel used in thermal power generation during peak demand periods. FSA rates are revised quarterly by DISCOMs. It is typically ₹0.10–0.50/kWh but can spike to ₹1.00+/kWh during coal shortage periods. Check your latest electricity bill for the current FSA rate and enter it in the calculator for an accurate total.
Several Indian state governments subsidise electricity for domestic consumers: Karnataka (Gruha Jyothi scheme): free up to 200 units/month (extended to 200 units in 2023, from 30 units previously). Tamil Nadu (TANGEDCO): free first 100 units/month for domestic consumers. Himachal Pradesh: free up to 125 units/month. Punjab: free up to 600 units/month for BPL households. Andhra Pradesh and Telangana also have subsidy schemes. This calculator includes approximate Karnataka and Tamil Nadu slab rates reflecting these subsidies.
MSEDCL uses a telescopic slab system for LT-1 (domestic) consumers: 0–100 units at ₹3.78/kWh; 101–300 units at ₹7.54/kWh; 301–500 units at ₹9.83/kWh; above 500 units at ₹11.57/kWh. Important: in MSEDCL's telescopic billing, these rates apply only to the units in each band, consuming 150 units means: 100 units × ₹3.78 + 50 units × ₹7.54 = ₹378 + ₹377 = ₹755 energy charge. Additional fixed charges and FSA apply on top.
Key measures: Switch to 5-star rated appliances, a 5-star AC uses 20–25% less electricity than a 3-star AC. Use LED lights exclusively, a 10W LED gives the same light as a 60W incandescent, saving 50 units/bulb/year at 4 hours/day. Set AC at 24°C instead of 18°C, each degree higher saves 6% electricity. Install solar panels, a 3 kWp rooftop solar system generates approximately 360–400 units/month in most Indian cities, reducing or eliminating grid bills with net metering.
Enter your monthly units consumed (from your electricity bill or meter). Select your state tariff from the dropdown to apply the approximate slab rates for that DISCOM. Adjust the fixed charge to match your bill. Set the fuel surcharge to your current FSA rate. The result shows energy charge, total monthly bill, effective per-unit rate, daily average cost, and estimated annual bill. Note: these are approximate calculations, always verify against your actual bill.
Your electricity meter shows total units (kWh) consumed since installation. To find monthly consumption: read the meter on the same date each month and subtract the previous reading. For example, if the reading is 5420 on 1 June and 5620 on 1 July, you consumed 200 units in June. Most Indian DISCOMs have migrated to smart meters (AMI) in urban areas, these are read remotely, and consumption is available on the DISCOM app or website. Traditional meters (electromechanical) require manual reading.
Several Indian DISCOMs have introduced Time of Day (ToD) or Time of Use (ToU) tariffs, charging higher rates during peak hours (typically 6 PM–10 PM) and lower rates during off-peak hours. This applies mainly to commercial and industrial consumers, most domestic consumers are on flat slab tariffs. However, with smart meters being rolled out nationwide under the Revamped Distribution Sector Scheme (RDSS), ToD tariffs for residential consumers are expected to expand. Running high-consumption appliances (washing machine, dishwasher) during off-peak hours will save money once these tariffs apply.
Average monthly consumption varies widely: a small 1 BHK in a city without AC: 80–120 units; 2 BHK with 1 AC and normal appliances: 200–300 units; 3 BHK with 2 ACs: 400–600 units in summer. India's per capita residential electricity consumption is approximately 250–300 kWh/year (20–25 units/month), well below the global average of 800 kWh/year, reflecting that millions of Indian households do not have ACs and use energy-efficient appliances due to affordability constraints.
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