DesiMetrics
Updated with 2026 tariff rates

Free Indian Utility Calculators

Electricity, Water, Gas, Solar, AC & Finance — done precisely.

Slab-by-slab bill calculators, payback tools and everyday finance maths for every Indian household — built on real DISCOM tariffs. No login, nothing stored.

Quick Bill Estimate

2026 tariff

Estimated bill for Tamil Nadu

₹745.00

Full Tamil Nadu breakdown →

36

States & UTs

200+

Calculators

100%

Free, no login

SERC

Source-verified

TNEB 200 units/month ≈ ₹745.005-star vs 3-star AC (1.5T, 6 hrs/day) saves ~₹3,762.54/year3 kW rooftop solar pays back in ~5.06 years in Tamil NaduCheapest top slab: Lakshadweep at ₹1.50/unit36 states & UTs covered, one calculator engineTNEB 200 units/month ≈ ₹745.005-star vs 3-star AC (1.5T, 6 hrs/day) saves ~₹3,762.54/year3 kW rooftop solar pays back in ~5.06 years in Tamil NaduCheapest top slab: Lakshadweep at ₹1.50/unit36 states & UTs covered, one calculator engine
The complete toolkit

Every rupee you spend on power & more

36 states & UTs

Electricity

36 calculators

Slab-by-slab bills for every DISCOM in India

Explore Electricity hub →
☀️

Solar

5 calculators

Rooftop payback, sizing, backup and subsidy, priced on your tariff

Explore Solar hub →
Most popular❄️

Air Conditioning

6 calculators

What your AC actually costs, priced at your top slab

Explore Air Conditioning hub →
💧

Water

36 states covered

Municipal water bill, from your own consumption and rate

Explore Water hub →
🔥

Gas

21 providers listed

Piped gas (PNG) bill, from your own consumption and rate

Explore Gas hub →
🔌

Appliances

6 calculators

Fan, fridge, inverter sizing and backup — real running cost

Explore Appliances hub →

Fuel Cost

3 calculators

Petrol/diesel, LPG cylinder and generator running cost

Explore Fuel Cost hub →
🧮

Finance

4 calculators

GST, SIP, gratuity and tax-regime maths, done right

Explore Finance hub →
Straight from the tariff files

Who pays the least — and the most — per unit?

Top domestic slab rate by state, computed straight from each DISCOM's own tariff file — not a national average.

Only on DesiMetrics

See what solar could save you

Get your rooftop payback and PM Surya Ghar subsidy in seconds — then, if you want, we’ll connect you with three verified installers in your area. Free, no obligation.

  • ✓ Payback priced against your real DISCOM tariff
  • ✓ Central subsidy up to ₹78,000
  • ✓ Quotes from vetted local installers

Get 3 free installer quotes

Tell us a bit about your home and we’ll connect you with verified rooftop solar installers in your area.

No spam. We share your details only with installers you’re matched to.

Built on the record, not guesswork

How we verify every tariff

1

Source the order

We pull rates straight from the SERC tariff order or DISCOM notification — the primary document, not another calculator.

2

Cross-check the figures

Every slab, fixed charge and subsidy is encoded into a schema-validated file so the maths is reproducible and auditable.

3⦿ Verified 29 August 2026

Publish with a date-stamp

Each calculator carries a verification status and last-checked date, linked back to its source order.

From the blog

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Frequently asked questions

Are these calculators free to use?+

Yes. Every calculator on DesiMetrics is free, needs no login, and works on any device. We plan to keep the core calculators free permanently.

Which states and DISCOMs are supported?+

All 28 states and 8 union territories are covered, each using its main DISCOM's domestic tariff. Data is being progressively cross-checked against primary SERC orders; each calculator shows its verification status.

How accurate are the bill estimates?+

Calculations use each DISCOM’s published telescopic slab rates, fixed charges, fuel cost adjustment and subsidies. They are close estimates; your final bill can vary slightly due to rounding, meter rent or tariff revisions.

Where does the tariff data come from?+

From State Electricity Regulatory Commission (SERC) tariff orders and DISCOM notifications. Each calculator shows when its data was last verified and links to the source order.

Do you sell or store my data?+

No. Every calculator runs entirely in your browser — nothing you enter is saved, logged in against an account, or sold. The optional installer-quote form is the only place we collect contact details, and only if you submit it yourself.

How is DesiMetrics different from other bill calculators?+

Most bill-calculator sites use one generic slab table for every state. Ours is one schema-validated tariff file per DISCOM, so telescopic slabs, fixed charges, FCA and subsidies are modelled exactly as that DISCOM bills them — not approximated.