Estimate your monthly electricity bill before it arrives. Enter the units consumed, the rate per unit and any fixed charges to see your estimated bill.
1. Enter the units (kWh) you used this month. 2. Enter the rate per unit from your bill. 3. Add fixed charges and tax if you know them, then click Calculate Electricity Bill.
Electricity bills can be hard to understand, with units, slab rates, fixed charges, taxes and fuel adjustments all mixed together. This free electricity bill calculator gives you a clear estimate in seconds: enter the units you consumed, the rate per unit and any fixed charges, and it shows your energy charges, the tax and the total bill. Use it to check whether your bill looks right, to budget for the summer months when the air conditioner runs, or to see how much you would save by using less electricity.
One unit of electricity is one kilowatt-hour (kWh): using a 1,000-watt appliance for one hour uses one unit. A 100-watt bulb uses one unit in 10 hours, and a 1,500-watt air conditioner uses about 1.5 units every hour. Most homes in Pakistan use between 200 and 500 units a month, depending on the season, the number of fans and air conditioners, and how many hours they run.
Suppose you used 300 units in a month at a rate of 35 rupees per unit, with fixed charges of 500 and tax of 10 percent. The energy charges are 300 times 35, which is 10,500. Adding the fixed charges gives 11,000. The tax is 10 percent of 11,000, which is 1,100, so the total bill is 12,100. Your average cost is 12,100 divided by 300, which is about 40.33 per unit. Try it in the calculator above: enter 300, 35, 500 and 10, and check that your result matches 12,100.
Take a smaller household that used 150 units at 30 per unit, with fixed charges of 200 and no tax. The energy charges are 150 times 30, which is 4,500, and adding the fixed charges gives a total bill of 4,700. The average cost per unit is 4,700 divided by 150, which is about 31.33. Notice how fixed charges matter more for small users: here they add about 1.33 per unit to the average cost. If the same household used 300 units instead, the fixed charges would spread over twice as many units and the average cost would be lower.
The basic formula is: total bill = (units used times rate per unit) plus fixed charges, plus tax on that total. In real life, the rate per unit is not the same for everyone: most electricity companies use slab rates, where the first 100 units cost less per unit than the next 100, and so on. They also add a fuel cost adjustment, meter rent and other charges that change every month. That is why this calculator gives an estimate using one flat rate you choose — for the exact bill, use the rate from your own bill or your supplier's current tariff.
Find your units on the last bill. Your bill shows the units used and the rate, so use those exact numbers for the best estimate. Check the summer months. Air conditioners can double or triple your units, so calculate separately for summer and winter. Use the right rate. If your supplier charges different rates for different slabs, use the average rate from your last bill. Compare before and after. Calculate your bill before buying a new appliance to see how much it will add each month. Save where it is easy. LED bulbs, fans on low speed and switching off unused appliances all cut units directly.
Using the wrong units. Units are kilowatt-hours, not watts: a 100-watt bulb running for 10 hours uses 1 unit, not 100. Forgetting fixed charges and tax. The energy charges alone are not the full bill; fixed charges and tax add a real amount. Using an old rate. Electricity rates change often, so an old rate gives a wrong estimate. Ignoring slab rates. If your supplier charges more per unit after 200 or 300 units, a flat rate can understate a big bill. Estimating units from memory. Check your meter or your last bill instead of guessing, because a guess can be far out.
Pro Tip: To find how much one appliance costs, multiply its watts by the hours you use it each day, divide by 1,000 to get daily units, then multiply by 30 days and your rate per unit.
Note: This calculator uses one flat rate per unit. Real bills use slab rates plus fuel adjustment, meter rent and other charges, so your actual bill may differ from this estimate.
How is an electricity bill calculated? The basic formula is (units used x rate per unit) + fixed charges + tax. For example, 300 units at 35 per unit plus 500 fixed charges and 10 percent tax gives a bill of 12,100.
What is one unit of electricity? One unit is one kilowatt-hour (kWh). A 1,000-watt appliance running for one hour uses one unit. A 100-watt bulb uses one unit in 10 hours.
How many units does a normal house use per month? Most homes in Pakistan use 200 to 500 units a month. Small homes without air conditioning may use 100 to 200 units, while homes with several air conditioners can use 800 units or more in summer.
Why is my bill higher in summer? Air conditioners use 1 to 2 units every hour, so running them for 8 hours a day adds 240 to 480 units a month. Fans, fridges and water pumps also run more in hot weather.
What are fixed charges? Fixed charges are a set monthly amount your electricity supplier charges for the connection, meter and service, no matter how many units you use. They are shown separately on your bill.
What is a fuel cost adjustment? It is an extra charge that changes with the cost of fuel used to generate electricity. It is added to your bill and can go up or down every month.
How can I reduce my electricity bill? Use LED bulbs, run air conditioners at 24-26 degrees, switch off fans and lights in empty rooms, use energy-efficient appliances, and service your air conditioner regularly.
Is this calculator the same as my real bill? No, it is an estimate using one flat rate. Real bills use slab rates and extra charges, so always check your actual bill for the exact amount.
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