Electricity Cost Calculator
Work out how many units (kWh) any device uses in a month and what that costs at your electricity rate.
Updated
Formula
kWh = Watts × Hours per day × Days ÷ 1000
Cost = kWh × Rate per unit
One unit on your bill is one kilowatt-hour (kWh): 1,000 watts running for one hour.
Examples
1.5 ton AC (1,700 W) for 8 h/day
408 units (kWh) per month ≈ Rs 22,440 at Rs 55.00/unit
5 fans (80 W) for 12 h/day
144 units (kWh) per month ≈ Rs 7,920 at Rs 55.00/unit
Water pump (750 W) for 1 h/day
22.5 units (kWh) per month ≈ Rs 1,238 at Rs 55.00/unit
Reference table
| Appliance | Typical watts | Typical hours/day | Units/month (30 days) |
|---|---|---|---|
| AC 1 ton (non-inverter) | 1,100 | 8 | 264 |
| AC 1.5 ton (non-inverter) | 1,700 | 8 | 408 |
| AC 2 ton (non-inverter) | 2,300 | 8 | 552 |
| AC 1 ton (inverter, average) | 650 | 8 | 156 |
| AC 1.5 ton (inverter, average) | 950 | 8 | 228 |
| AC 2 ton (inverter, average) | 1,300 | 8 | 312 |
| Ceiling fan (AC motor) | 80 | 12 | 28.8 |
| Ceiling fan (DC inverter) | 35 | 12 | 12.6 |
| Pedestal fan | 60 | 8 | 14.4 |
| Air cooler | 200 | 10 | 60 |
| Refrigerator (average draw) | 150 | 24 | 108 |
| Deep freezer (average draw) | 200 | 24 | 144 |
| Microwave oven | 1,200 | 0.5 | 18 |
| Electric kettle | 1,800 | 0.25 | 13.5 |
| LED TV (43–55 inch) | 100 | 5 | 15 |
| Washing machine | 500 | 1 | 15 |
| Iron | 1,000 | 0.5 | 15 |
| Water pump (1 HP) | 750 | 1 | 22.5 |
| Desktop computer | 200 | 6 | 36 |
| Laptop | 60 | 6 | 10.8 |
| LED bulb | 12 | 6 | 2.2 |
| LED tube light | 20 | 6 | 3.6 |
| Wi-Fi router | 10 | 24 | 7.2 |
Important information
- Electricity tariffs in Pakistan change often and depend on your DISCO (LESCO, IESCO, K-Electric, MEPCO, etc.), monthly slab, protected/unprotected status, fuel price adjustment and taxes. That is why the rate is always an input — pre-filled with an example of Rs 55 per unit.
- To find your real all-in rate, divide the total amount on your latest bill by the units consumed.
- Since 2026, domestic bills also include a fixed monthly charge based on sanctioned load (kW), in addition to the per-unit charge — add it as a fixed charge in the bill estimator.
Frequently asked questions
How do I calculate electricity units?
Multiply the wattage by hours used per day and by the number of days, then divide by 1,000. A 100 W TV for 5 hours a day for 30 days uses 15 units.
What is one unit of electricity?
One kilowatt-hour (kWh) — the energy used by a 1,000-watt appliance in one hour.
Why is my bill higher than units × rate?
Bills include fixed charges, fuel price adjustments, taxes and duties, and the rate can jump when you cross a slab.
Where do I find an appliance's wattage?
On the rating label or in the manual. For ACs, look for the rated input power (W), not the cooling capacity (BTU).
Learn more
- How to Estimate Your Electricity Bill — Turn watts and hours into units, find your real rate per unit from your bill, and see which appliances matter most in a Pakistani home.
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