The short answer: match the two readings to the same period
For a normal single-register meter, electricity units on an issued bill are its present reading minus its previous reading. One unit is one kilowatt-hour (kWh). If the bill shows a meter multiplication factor (MF or MMF), use the factor that applies to that meter and bill. For a typical direct-connected home meter the factor may be 1; do not assume that every connection uses 1. The Pakistan Power Division explains that electricity bills measure use in kWh, while NEPRA's Consumer Service Manual requires bills to show the reading date and previous and present readings.
Both readings must belong to the same meter, register and billing cycle. Check the bill's reading date before comparing it with a meter photo taken today. If the bill has separate peak and off-peak rows, calculate each matching register separately.
This calculation checks consumption, not the final rupee amount. Slabs, fixed charges, adjustments, taxes and the billing mode can change the amount due. A correct units figure does not by itself prove that every charge is correct.
Check the units on the bill you received
Find the bill's reading date, previous reading, present reading, units and any MF/MMF. The labels and layout vary by distribution company. Check the meter number too if you have more than one meter. Compare like with like: an import reading from the same register at the start and end of the billed period. A current meter display photographed weeks after the bill's reading date is not the bill's present reading.
| Record | Reading | What it means |
|---|---|---|
| Previous bill reading, 4 September | 23,180 | Start of this bill's period |
| Present bill reading, 3 October | 23,427 | End of this bill's period |
| Difference, with MF 1 | 247 kWh | Units for this issued bill |
| Meter photo, 12 October | 23,498 | Later reading; use for a different check |
In this example, 23,427 − 23,180 = 247 units. If the units line says 247 and the bill is marked as a normal reading, the basic subtraction agrees. The date matters: the 12 October meter photo was taken nine days after the bill's 3 October reading, so it cannot replace the bill's present reading when checking that issued bill. Your bill may show additional import and export readings for solar net metering; do not subtract one from the other as if they were consecutive readings of a single register.
Calculate units used since your last bill
A different question is, “How many units have I used after the last bill was read?” Now the starting number is that bill's present reading. Record today's reading from the matching register and note the date and time. For the example above, 23,498 − 23,427 = 71 units between 3 and 12 October. These units belong to the new, still-open period, subject to the utility's actual next reading and billing treatment.
Subtracting 23,180, the old bill's previous reading, from today's 23,498 would give 318. That combines 247 units already counted on the issued bill with 71 units used since its reading date. It does not mean the current unpaid period already used 318 units. If your utility took the actual reading on a different date from the printed bill date, use the reading dates shown in your records and ask the utility to clarify an unclear period.
What changes with a meter factor or peak and off-peak readings?
A printed multiplier
Some connections have a meter factor because the display reading must be scaled to billed energy. K-Electric's bill guide identifies MMF for large industrial connections using current transformers. Treat this as a conditional step: use the factor shown for your own meter and ask the utility if the bill's units already include it. Do not apply a multiplier twice. For example, if a bill shows previous 8,004.5, present 8,021.5 and an applicable factor of 20, the reading difference is 17 and billed use is 17 × 20 = 340 kWh. That factor is an illustration, not a default for households.
Two time-of-use registers
A time-of-use (TOU) bill may list separate peak and off-peak readings. Subtract each register's own previous reading from its present reading for the same period. In this invented example, peak goes from 1,240 to 1,275, or 35 units. Off-peak goes from 5,110 to 5,287, or 177 units. With factor 1 for both, the two rows total 212 units. The rows may have different prices, but the unit arithmetic is still subtraction within each register. Do not add a separate overall total register again if it already represents the same usage.
| Register | Previous | Present | Units |
|---|---|---|---|
| Peak | 1,240 | 1,275 | 35 |
| Off-peak | 5,110 | 5,287 | 177 |
| Combined | — | — | 212 |
Use the labels on your bill and meter rather than a screen code from a general web guide: display sequences and meter types differ. Solar import, solar export and any other separate register need their own matching previous and present values. Their treatment on the bill follows the applicable connection and billing rules; the simple household example here does not calculate a net-metering settlement.
If your calculation disagrees with the bill
First check whether the bill used a normal reading, an average or estimate, a detection entry, or an adjustment. K-Electric's official bill explainer lists those charge modes. NEPRA's manual also allows an average figure when a meter is defective, so a non-normal bill may not equal a straightforward subtraction of the displayed readings. A meter change, corrected reading, separate TOU rows, or an incorrectly read digit can also make a quick comparison misleading. This is a reason to inspect the bill details, not evidence by itself that you were overcharged.
- Check the period and meter. Match the bill's reading date and meter number to the meter and any dated photo. An old photo from another period cannot verify this bill.
- Check each register and factor. Keep import, export, peak and off-peak readings separate. Note whether the bill has already applied an MF/MMF.
- Check the billing mode. An estimated or adjusted bill needs its stated basis, not only a subtraction of two figures that may not be actual readings.
- Keep evidence. Save the bill, a clear photo showing the meter number and displayed reading, and the date of the photo. Never open or alter a sealed meter to investigate.
If the discrepancy remains, contact the distribution company using the complaint details on your bill and provide the period, readings, meter number and photos. The Pakistan Power Division says consumers can raise billing and meter-reading complaints through their power distribution company. Ask how any estimate, meter replacement or correction was carried into the next bill. A self-calculated difference is useful evidence for a question; the utility's record and applicable billing rules determine the final account.
Units are a starting point, not a full bill forecast
Even when your 247-unit calculation matches, multiplying 247 by one advertised rate may not reproduce the amount due. Your category, applicable slabs, time-of-use prices, fixed charges, adjustments and taxes can matter. This guide deliberately does not give current tariff figures because they change. Read the charge lines and current schedule on your utility's official bill or site if you need to examine the rupee total.
If you want to understand why the meter moved by a certain number of units, estimate an appliance's contribution from its watts and hours in our appliance electricity-use guide. The Electricity Cost Calculator models that appliance estimate using a rate you enter. Neither tool reads your meter, verifies a bill, or applies your full regulated tariff automatically. Use the actual meter readings for the bill check above.