Calculate your electricity bill with state-wise DISCOM tariff slabs
Built & maintained by Pappu Venkata Subbi Reddy, founder of Clacify · Updated August 2026 · Formulas verified against official Indian government sources
The Electricity Bill Calculator estimates your monthly electricity bill using real slab-wise tariff structures from 29 DISCOMs (distribution companies) across 14 Indian states — from BESCOM in Karnataka to BSES Rajdhani and Tata Power in Delhi to TANGEDCO in Tamil Nadu. Select your state and DISCOM, enter the units you consumed (from your meter or last bill), and it runs that consumption through the same tiered slab pricing your utility actually uses, then adds the fixed/meter charge, the fuel or power-purchase-adjustment surcharge, and the electricity duty or tax that show up as separate line items on a real Indian electricity bill. Where a state runs a subsidy scheme the calculator knows about — Delhi's Muft Bijli Yojana, which zeroes out the bill up to 200 units and halves it for 201–400 units — that's applied automatically too. The tariffs are built directly into the tool rather than fetched live, so they reflect the FY 2024-25 rate orders published by each DISCOM at build time; the tool flags this on every result and points you to the DISCOM's own site to confirm the current rate before you rely on the number for anything official.
For your chosen DISCOM, the calculator walks your units through that utility's actual slab structure: each slab has an upper bound and its own per-unit rate, and consumption is charged slab by slab — the first slab's units at its rate, the next slab's units at its (higher) rate, and so on, the way a real telescoping electricity tariff works, not a flat rate applied to every unit. On top of the resulting energy charge it adds a fixed/meter charge (a flat rupee amount independent of usage), a fuel or power-purchase-adjustment surcharge in ₹/unit where the DISCOM levies one, and an electricity-duty/tax percentage applied to the energy charge where the state charges one — for example Gujarat's four DISCOMs currently carry a 20% duty in the tool, while Karnataka's BESCOM/HESCOM/GESCOM group and Madhya Pradesh's MPMKVVCL carry none. Where a DISCOM offers free units — TANGEDCO's first 100 units in Tamil Nadu — those units are subtracted from billable consumption before the slabs are applied. Delhi's Muft Bijli subsidy is layered on last, as a rebate on the energy + fuel + duty + fixed total rather than a units-based waiver: 100% back when total consumption is ≤200 units, 50% back for 201–400 units, and no subsidy above that. All of this is a plain JavaScript calculation against tariff tables built into the tool — nothing about your usage is transmitted to a server.
| DISCOM (state) | Slabs | Fixed charge | Other charges |
|---|---|---|---|
| BESCOM (Karnataka) | 0–30: ₹3.15 · 31–100: ₹5.50 · 101–200: ₹6.60 · 201–500: ₹7.10 · 500+: ₹7.60 | ₹30/month | Fuel surcharge ₹0.80/unit, no duty |
| MSEDCL (Maharashtra) | 0–100: ₹2.89 · 101–300: ₹5.53 · 301–500: ₹8.57 · 500+: ₹9.91 | ₹55/month | Electricity Duty 16%, fuel ₹0.33/unit |
| TANGEDCO (Tamil Nadu) | First 100 units free · 101–200: ₹2.25 · 201–500: ₹4.50 · 501–1000: ₹6.00 · 1000+: ₹8.00 | ₹30/month | No duty, no fuel surcharge |
| BSES Rajdhani (Delhi) | 0–200: ₹3.00 · 201–400: ₹4.50 · 401–800: ₹6.50 · 801–1200: ₹7.00 · 1200+: ₹8.00 | ₹20/month | Electricity Duty 5% + Muft Bijli subsidy |
These are the FY 2024-25 tariff orders built into the calculator. DISCOMs revise rates roughly once a year, so cross-check against your latest bill or the DISCOM's own website before treating the estimate as final — the tool links to each one in its disclaimer.
Indian electricity tariffs are slab-based (telescoping), meaning different portions of your consumption are billed at different rates — not your whole usage at whichever slab it falls into. Take 250 units on BESCOM: the first 30 units cost ₹3.15 each (₹94.50), the next 70 units (31–100) cost ₹5.50 each (₹385), the next 100 units (101–200) cost ₹6.60 each (₹660), and the last 50 units (201–250) cost ₹7.10 each (₹355) — an energy charge of ₹1,494.50, not 250 × ₹7.10. Add the ₹30 fixed charge and 250 × ₹0.80 = ₹200 fuel surcharge, and the estimated bill comes to about ₹1,724.50. This is exactly why doubling your usage roughly doubles your bill and then some — the extra units land in progressively more expensive slabs.
Delhi's scheme isn't "the first 200 units are free" — it's a rebate on the whole computed bill (energy + fuel + duty + fixed charge together) once your total consumption qualifies. Use ≤200 units in a month and the calculator zeroes out that entire total; use 201–400 units and it knocks 50% off the same total; cross 400 units and no subsidy applies at all, so you pay the full slab-based bill on every unit. That's a meaningful cliff — going from 400 to 401 units doesn't just add one unit's cost, it also removes a 50% rebate on everything below it.
Two honest limitations. First, real free-unit schemes like TANGEDCO's often carry an eligibility condition — for example, only applying if total monthly consumption stays under a cap — which this calculator doesn't model; it subtracts the free units regardless of how high your total usage is, so treat the free-unit result as indicative rather than exact once you're well above typical household usage. Second, real bills can include items this tool doesn't: GST on certain components, local body cess, meter rent for specific connection types, and different rates for single-phase versus three-phase connections. This is a planning estimate, not a substitute for your DISCOM's own billing system.
Indian electricity bills use a slab-based (tiered) system where the first X units cost less per unit and usage above that costs more. Your bill = (energy charges by slab) + fixed meter charge + fuel/power purchase adjustment charge + electricity duty/tax − any government subsidy. Use Clacify's Electricity Bill Calculator to see each component separately for your DISCOM.
Common reasons: (1) You crossed a higher tariff slab — in slab systems, using 201 units instead of 200 means ALL units are charged at the higher rate in some states. (2) Fuel surcharge increased quarterly. (3) Air conditioner running longer in summer. (4) Geyser or EV charger added to usage. Use the calculator to find exactly which slab you're in.
Top 5 ways: (1) Set AC to 24°C or higher — each degree lower adds 6% to consumption. (2) Switch to 5-star BEE-rated appliances. (3) Stay within lower slabs — if you're at 195 units, reducing by 5 saves disproportionately. (4) Use LED bulbs. (5) Turn off geysers 15 minutes after use and switch to solar water heaters for maximum savings.