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Electricity Cost Calculator
Find out what your appliances cost to run. Add your fans, lights, AC and more, enter your rate per kWh and see your energy use and electricity cost per day, month and year.
Check your appliances and the rate, then press Calculate.
What Is an Electricity Cost Calculator?
An electricity cost calculator tells you how much money your appliances use. Every device has a power rating in watts. When it runs for some hours, it uses energy, and the energy is measured in kilowatt hours (kWh). Your electricity company charges a rate for each kWh, so the cost is simply the energy used multiplied by the rate.
This calculator lets you build a list of the appliances in your home. For each one you enter the quantity, the watts and the hours of use a day. It then shows the energy used each day and month, the cost of each appliance, and the full bill with tax. It is a quick way to find out which devices use the most power and where you can save.
How to Use This Electricity Cost Calculator
- Pick your country. A typical rate and tax are filled in. Replace them with the rate printed on your own bill for a better estimate.
- Check the days in the month. The default is 30 days.
- Choose your appliances. Select a device from the list to fill in typical watts and hours, then change the numbers to match your use. You can add as many appliances as you need.
- Press Calculate. You see the estimated monthly bill, the energy used and a table that ranks every appliance by cost.
How Electricity Cost Is Calculated
The method has three short steps:
- Energy a day (kWh) = watts x hours a day x quantity / 1,000
- Energy a month (kWh) = energy a day x days in the month
- Cost = energy a month x rate per kWh, plus any tax
For example, a 75 watt ceiling fan that runs 8 hours a day uses 75 x 8 / 1,000 = 0.6 kWh a day, which is 18 kWh in 30 days.
Typical Energy Use of Home Appliances
These are common values for a 30 day month. Real use depends on the model, the age of the device and how you use it.
| Appliance | Watts | Hours a day | kWh a day | kWh a month |
|---|---|---|---|---|
| LED bulb | 10 | 5 | 0.05 | 1.5 |
| Tube light | 36 | 5 | 0.18 | 5.4 |
| Ceiling fan | 75 | 8 | 0.6 | 18 |
| Refrigerator (average use) | 150 | 8 | 1.2 | 36 |
| TV 55 inch | 100 | 5 | 0.5 | 15 |
| Laptop | 60 | 6 | 0.36 | 10.8 |
| Wi-Fi router | 10 | 24 | 0.24 | 7.2 |
| Washing machine | 500 | 1 | 0.5 | 15 |
| Iron | 1,000 | 0.5 | 0.5 | 15 |
| Water heater | 2,000 | 1 | 2 | 60 |
| Air conditioner 1.5 ton | 1,500 | 8 | 12 | 360 |
A refrigerator is listed at 8 hours because the compressor does not run all day. It switches on and off to keep the temperature.
Electricity Rates Used in the Calculator
The rate per kWh is different in every country and often changes with the amount you use. The calculator starts with a typical household rate, which you should replace with the rate on your own bill.
| Country | Starting rate per kWh | Tax added |
|---|---|---|
| Bangladesh | Tk 8.50 (76 to 200 unit slab) | 5% VAT |
| India | Rs 7.00 (typical average, varies by state) | None added |
| UAE | AED 0.30 (typical household rate) | 5% VAT |
| Saudi Arabia | SAR 0.18 (up to 6,000 kWh a month) | 15% VAT |
| United Kingdom | 27p (typical, includes VAT) | None added |
| United States | $0.17 (typical average) | None added |
In Bangladesh the household tariff from June 2026 is charged in slabs: Tk 4.63 for 0 to 50 units, Tk 5.26 for 0 to 75 units, Tk 8.50 for 76 to 200 units, Tk 9.10 for 201 to 300 units, Tk 9.62 for 301 to 400 units, Tk 15.01 for 401 to 600 units and Tk 17.35 above 600 units. The higher your use, the higher the rate, so enter the rate of your own slab. Check your distributor, because tariffs are revised from time to time.
Electricity Cost Examples
| Case | Working | Result |
|---|---|---|
| Ceiling fan, 75 W, 8 hours, Bangladesh | 18 kWh x Tk 8.50 = Tk 153, plus 5% VAT | Tk 160.65 a month |
| 1.5 ton AC, 1,500 W, 8 hours, India | 360 kWh x Rs 7 | Rs 2,520 a month |
| 5 LED bulbs, 10 W, 5 hours, UAE | 7.5 kWh x AED 0.30 = AED 2.25, plus 5% VAT | AED 2.36 a month |
| Refrigerator, 150 W, 8 hours, Saudi Arabia | 36 kWh x SAR 0.18 = SAR 6.48, plus 15% VAT | SAR 7.45 a month |
Why Your Real Bill May Be Different
Slab and tiered rates. Many countries charge a higher rate as your use grows, so a single average rate is only an estimate.
Fixed charges. Meter rent, demand charges, service fees and surcharges can add to the bill even when you use little power.
Standby power. TVs, chargers, routers and set-top boxes use a small amount of power when they look off.
Real use of motors. Refrigerators, air conditioners and pumps cycle on and off. Their real kWh depends on the weather, the thermostat and the age of the machine.
Wrong watts or hours. Check the label on the device. If you only know the volts and amps, multiply them to get the watts.
Tips to Reduce Your Electricity Bill
Replace old bulbs with LEDs, which use far less power than old filament bulbs. Set the air conditioner to 24 to 26 degrees and clean its filters, because every degree lower raises the bill. Choose appliances with a good energy rating, unplug chargers and devices you do not use, and run washing machines with full loads. Use the table in this calculator to find the biggest users, then start saving with those first.
Frequently Asked Questions
How do I calculate the electricity cost of an appliance?
Multiply the watts by the hours of use and divide by 1,000 to get kWh. Then multiply the kWh by your rate per kWh. A 1,000 watt iron used for 1 hour uses 1 kWh, so at a rate of 8 it costs 8.
What is a kWh?
A kilowatt hour is the energy used by a 1,000 watt device running for one hour. It is the unit that electricity companies use on your bill, and it is also called a unit of electricity.
How much does an air conditioner cost to run?
A 1.5 ton air conditioner uses about 1,500 watts when it is running. If it runs 8 hours a day, that is about 12 kWh a day or 360 kWh in a 30 day month. Multiply by your rate to get the cost. In practice the compressor cycles, so the real use is often lower.
Why is my real electricity bill different from the estimate?
The calculator uses one rate for all units, but real bills often use slabs, fixed charges and surcharges. The watts and hours you enter are also estimates. Use the rate of your own slab and the real hours of use for a closer figure.
How do I find the watts of my appliance?
Look at the rating label on the back or bottom of the device, or in the manual. It shows the power in watts. If it only shows volts and amps, multiply the two numbers to get the watts.
How are electricity bills charged in Bangladesh?
Household customers pay a rate per unit (kWh) that rises in slabs as monthly use increases, plus 5% VAT and a small meter rent. The slabs are set by the Bangladesh Energy Regulatory Commission and can change, so check your distributor for the current figures.
How can I lower my electricity bill?
Switch to LED lighting, use efficient fans and air conditioners, set the thermostat higher, switch off devices you do not use and avoid standby power. Start with the appliances at the top of the results table, because they cost the most.