Rates checked 22 Oct 2026

Electricity bill calculator, slab by slab

BillDecoded is an independent platform that explains your electricity bill by breaking it down, unit by unit. Enter the units from your EB bill and see every line, and where each rate comes from.

Who sends your bill?TNEBTamil NaduUPPCLUttar Pradesh calculatorMSEDCLMaharashtra calculatorPGVCLGujarat calculator
KSEBKerala: coming soon
BESCOMKarnataka: coming soon
unitsSee bill

On your TNEB bill this is the consumption for the bill period. TNEB bills every two months.

Or tap:

TNEB: 450 units in two months

₹1,255

What you pay for this use, before any arrears or adjustments.

  • 1 to 200 units₹0Free under the Tamil Nadu scheme.
  • 201 to 400 units₹940200 units at ₹4.70 each.
  • 401 to 450 units₹31550 units at ₹6.30 each.
  • Fixed charge₹0Nil for homes in Tamil Nadu (TNERC T.O. 6 of 2025).
You pay₹1,255

You're 50 units away from 500One unit past 500 adds ₹478.40 to the bill, because only the first 100 units stay free above 500.

Sends only your units and the total.

Rates from TNERC Order No. 4 of 2026, 27 Apr 2026 and TNERC Order No. 5 of 2026, 26 May 2026. Checked 22 Oct 2026.

Use 500 units or less in two months and the first 200 units are free. Go past 500 by even one unit and the bill jumps by ₹478.40. Homes pay no fixed charge.

For a Tamil Nadu home, the TNEB bill calculator shows the full working, with bills for 100 to 1,000 units, including 200, 300 and 500 units.

For a UPPCL home in Uttar Pradesh, the UPPCL bill calculator works out a monthly bill on the 2026-27 UPERC rates, with the fixed charge, fuel surcharge and, for a city home, electricity duty.

For an MSEDCL (Mahavitaran) home in Maharashtra, the MSEDCL bill calculator works out a monthly bill on the 2026-27 MERC rates, with wheeling, the month's fuel adjustment charge and electricity duty, matched to MSEDCL's own calculator.

For a Gujarat home on PGVCL, DGVCL, MGVCL or UGVCL, the Gujarat electricity bill calculator works out a one- or two-month bill on the 2026-27 GERC rates, with the fuel surcharge and electricity duty.

Electricity tariff changes in 2026

  1. 200 free units if you use 500 or less in two monthsWas 100. Above 500 units, still 100 free. What it means for your bill
  2. Subsidy for 2026-27 approved; what homes pay unchanged so farTNERC Order No. 4 of 2026, 27 Apr 2026

How to calculate your electricity bill

The formula is simple: units in each slab, times that slab's rate, added up. Then the fixed charge and any duty go on top. Step by step:

  1. Units used. Current meter reading minus the previous one.
  2. Slabs. Your board splits those units into blocks, each with its own rate.
  3. Free units and limits. Some states give free units; cross a limit and the rules change.
  4. Fixed charge. Nil for Tamil Nadu homes; in other states it depends on your load or slab.
  5. Duty and surcharges. Added last where your state charges them.

Bill higher than expected?

  • You crossed a slab line, so more units fall in dearer slabs. In Tamil Nadu, crossing 500 units also halves your free units.
  • The bill carries arrears, an adjustment or a late-payment penalty from an earlier bill.
  • You used more this period: summer cooling is the usual reason.
  • The meter was read late, so the bill covers more than 60 days.
Why your TNEB bill is high, and what to do

Rooftop solar subsidy for homes in 2026

The central subsidy under PM Surya Ghar: Muft Bijli Yojana (central subsidy amounts, Delhi government solar portal):

₹30,0001 kW
₹60,0002 kW
₹78,0003 kW and up

Our solar payback check, sized from your own bill, is next on our list.

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How we work

Every rate links to its order. Regulator orders and government notices, with the date we last checked.

Free to use. Just the calculator and the answer, on any phone.

Independent answers. If solar won't pay back for your home, we'll tell you.

Run by Raviraj Ramavarapu. How we check rates

Questions people ask

How do I calculate my electricity bill?

Subtract the previous meter reading from the current one to get units. Charge each block of units at its slab rate, then add the fixed charge and any duty your state applies. The calculator above does this for Tamil Nadu homes, line by line.

How many kWh is 1 unit of electricity?

Exactly one. A unit on your bill is one kilowatt-hour: a 1,000-watt appliance running for one hour.

What is an EB bill calculator?

An EB (electricity board) bill calculator works out your electricity bill from the units you used, using your board's slab rates, free units and charges. This one also shows every line of the bill and the order each rate comes from.

Can I calculate my bill from the meter reading?

Yes. Choose "Meter readings" in the calculator and enter the previous and current readings from your meter or bill. The difference is your units for the period.

Which states can I calculate?

Tamil Nadu (TNEB) now, and Uttar Pradesh homes supplied by UPPCL: see the UPPCL bill calculator. Maharashtra homes supplied by MSEDCL: see the MSEDCL bill calculator. Gujarat homes supplied by PGVCL, DGVCL, MGVCL or UGVCL: see the Gujarat electricity bill calculator.

Kerala and Karnataka are next. We publish a state only after its rates are checked against the regulator's order. If a charge comes from an official calculator instead, the page says so.