CalcPenguin

Appliance Electricity Cost Calculator

See how many units (kWh) an air-conditioner, heater or any appliance uses, and what it costs to run per day, month and year.

Your numbers are saved in this browser.
watts

On the appliance's label. A 1.5-ton inverter AC draws roughly 1,000 to 1,800 W while cooling.

hours
days
PKR

From your electricity bill. One unit = 1 kWh.

Cost a month

Rs 21,600

Units a month
360 kWh
Cost a day
Rs 720
Cost a year
Rs 262,800

Running 1,500 W for 8 hours a day uses 360 units a month, about Rs 21,600.00 at Rs 60.00 a unit.

How it's worked out

  1. Units a day1,500 W × 8 h ÷ 1,00012 kWh
  2. Units a month12 × 30 days360 kWh
  3. Cost a month360 × Rs 60.00Rs 21,600.00
  • Uses a flat price per unit. Tiered tariffs, fixed charges and taxes on your bill change the real total.

The formula

Units a day = watts × hours ÷ 1,000 · Cost = units × price per unit

Worked example

A 1,500 W appliance running 8 hours a day uses 12 units a day, or 360 units over 30 days. At Rs 60 a unit that's Rs 21,600 a month.

Questions people ask

How many units does a 1.5-ton AC use?

An inverter 1.5-ton AC typically draws around 1,000 to 1,800 watts while cooling, so 8 hours a day uses roughly 8 to 14 units. Check the wattage on your model's label.

What is a unit of electricity?

One unit is one kilowatt-hour (kWh): 1,000 watts running for one hour.

Why is my bill different?

Real bills use tiered rates, fixed charges and taxes. Use the average price per unit from your own bill for the closest estimate.

Formula and rules last checked 25 October 2026Written and tested by the CalcPenguin teamReport a problem