Advanced electricity bill calculator

Every field the tariff orders actually define — not a simplified estimate.

Time-of-day slots kVAh & power factor Sanctioned load & demand Solar export Arrears & surcharges Multiple meters

Same engine and tariff data as the quick calculator on the home page — opened straight into the detailed form.

Bill Calculator

Just your DISCOM and units — we handle the rest.

Marks a required field

Billing period start date
Billing period end date

Uncheck above (or type a value) to enter manually · can be negative (credit).
Check the top right of your old bill for “Connected / Sanctioned Load”. Exceeding this limit triggers excess-demand penalties in states like UP, Delhi and Maharashtra.
Advanced Billing Options Solar net-metering, ToD, arrears & penalties
Rate & months-late are set in the Arrear tab. Uncheck if late-payment surcharge does not apply for this consumer / period.

Enter amounts exactly as shown on your previous bill. LPSC on previous arrear is a direct amount, not computed.

LPSC amount on the previous arrear, as shown on your last bill.
Total Arrear: ₹ 0.00

LPSC is enabled by the “LPSC Applicable” toggle on the Meter Read tab. These fields set the rate and how many months the current bill is overdue.

Late Payment Surcharge per SERC order. Typically 1.5%.
Months late in paying the current bill (LPSC applied on current net).

Payments already made during this billing period — these reduce the total amount due.

Total Payment: ₹ 0.00

Any miscellaneous credits or charges — e.g., meter cost, security deposit refund, or rebate. Use negative values for credits.

Total Adjustment: ₹ 0.00
We'll compare it with our calculation and tell you if your bill looks right.

Your provisional bill will appear here

Select your DISCOM, fill in the details, and click
Calculate Provisional Bill

What the advanced fields are for

The detailed form exposes every input the tariff orders actually define. Most bills need only a handful of them. Here is what each one changes, and where to read more if a line on your bill is the reason you came looking.

Time-of-day (ToD) slots

Some connections are billed at different rates depending on when the units were used — a surcharge in the evening peak, often a rebate during solar hours. If your meter records ToD, entering units per slot rather than one total is what makes the estimate match. How ToD billing works →

kVAh and power factor

kWh measures real energy; kVAh also counts the reactive power drawn by motors and similar equipment. On a kVAh-billed connection a poor power factor inflates the units you are charged for, which is why the bill can rise without your consumption changing. Power factor and kVAh billing →

Sanctioned load and demand

Fixed charges are usually levied per kW of sanctioned load, so this field moves the bill even in a month you used nothing. Connections billed on maximum demand can also attract a penalty for exceeding the sanctioned figure. Fixed charges and sanctioned load →  ·  Excess demand penalties →

Solar export and banked credit

Under net metering, exported units offset imported ones and any surplus typically carries forward. Because netting removes your most expensive units first, an exported unit is worth your top slab rate rather than an average. How net metering savings work →

Fuel surcharge (FPPA / FAC / PPAC)

A separately notified charge that moves with the utility's power-purchase cost. It is levied either as a rate per unit or as a percentage of your energy and fixed charges, depending on the state, and it changes month to month. How the fuel surcharge is calculated →

Electricity duty and arrears

Duty is a state tax applied on top of the tariff, and the order in which it is applied relative to the fuel surcharge differs by state. Arrears and late-payment surcharge are carried amounts rather than anything derived from this month's units, so they are entered directly. What electricity duty is →

Multiple meters on one connection

Where a premises is served by more than one meter, each is read separately but the tariff's slabs and fixed charges may apply to the connection as a whole. Add each meter so the slab progression is computed once rather than repeated per meter.

What to have in front of you

For a rough estimate you need only your DISCOM and the units consumed. To reconcile against a printed bill, take these five figures off it:

  • Sanctioned load in kW — sets the fixed charge.
  • Billing period dates — a period that is not a clean month prorates the fixed charge by days.
  • Previous and current meter readings — rather than a units figure you have rounded.
  • Consumer category and supply type exactly as printed, since these decide which schedule applies.
  • Any arrears or adjustments shown as separate lines.

Where the rates come from, how they are verified, and what we do when a newer tariff order has not yet been audited is set out on our methodology page. You can also browse the full schedule for any state or DISCOM.

Frequently asked questions

Do I need my actual bill to use this calculator?
No, but it helps. Units consumed and your DISCOM are enough for an estimate. To match a printed bill closely you also want the sanctioned load, the billing period dates and the meter readings — those drive the fixed charge and the per-day proration, which are the two things that most often explain a gap between an estimate and the real figure.
Why is my calculated bill slightly different from the printed one?
Usually one of four reasons: the billing period is not a clean month, so fixed charges are prorated by days; a fuel surcharge was notified for that month and is not yet in our data; the bill carries arrears or a one-off recovery that no per-unit formula can derive; or your state applies a subsidy that depends on your own past consumption. The detailed form exposes the fields for the first three so you can reconcile them.
What is the difference between this and the calculator on the home page?
It is the same engine and the same tariff data — this page simply opens straight into the detailed form instead of the simplified one. The home page asks for your DISCOM and units and infers the rest, which suits most domestic bills. Use this page when you need time-of-day slots, kVAh, solar export, arrears or a multi-meter connection.
Does it work for commercial and industrial connections?
Yes, where our tariff data covers the category. Pick the category and supply type that match your connection and the form will show the fields that category actually uses — demand charges and power factor for connections billed on kVAh, for example. Supply-type eligibility is described in words on each option, because the tariff orders define those limits in prose rather than as a number.
Can I save or share a result?
Yes. A completed bill can be saved to your account and opened later at its own page, and any result can be shared as a link that reopens the calculator with the same inputs. Nothing about a shared link requires the person opening it to have an account.
Which tariff year do the rates come from?
Each DISCOM's page states the tariff order the rates were read from and whether we have verified them against real bills. Where a newer order exists that we have not yet audited, the page says so plainly rather than implying the figure is current. Our methodology page explains how rates are sourced and checked.