Utility Calculator Tool 2026
Electricity Cost Calculator.
Estimate electricity units, appliance running cost, monthly bill impact, and yearly electricity cost.
Loading Electricity Cost Calculator...
How to Use
Enter Power
Add appliance wattage or kilowatt rating.
Enter Usage
Add daily hours, billing days, and rate per unit.
View Cost
Get daily, monthly, yearly cost and total units.
Electricity Cost Formula
Standard Formula
Cost = Power kW × Hours × Days × Rate
Example: 1000W used for 5 hours daily for 30 days at ?8/unit costs 1 × 5 × 30 × 8 = ?1200.
Complete Guide
Electricity cost depends on appliance power rating, usage time, number of days, and electricity rate per unit. The power rating is usually written on the appliance label in watts or kilowatts.
One electricity unit equals one kilowatt-hour. If a 1000W appliance runs for one hour, it uses 1 unit. If a 500W appliance runs for two hours, it also uses 1 unit.
This calculator is useful for estimating the cost of running appliances like air conditioners, fans, geysers, refrigerators, TVs, laptops, washing machines, and lights.
Actual electricity bills may be higher because electricity boards often use slab rates and add fixed charges, taxes, meter rent, fuel surcharge, and other fees.
To reduce electricity cost, use energy-efficient appliances, switch off unused devices, choose LED lighting, maintain AC temperature wisely, and check high-power appliances like geysers and heaters.
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Electricity Cost FAQs
1. What is an electricity cost calculator?
An electricity cost calculator estimates how much an appliance costs to run based on power rating, usage hours, number of days, and electricity rate per unit.
2. How does this electricity cost calculator work?
It converts appliance power into kilowatts, multiplies by usage hours and days to calculate kWh units, then multiplies units by electricity rate.
3. What is the electricity cost formula?
Electricity cost = Power in kW × Usage hours × Days × Rate per unit.
4. What is 1 electricity unit?
1 electricity unit is equal to 1 kilowatt-hour, also written as 1 kWh.
5. How do I calculate appliance units?
Convert watts to kilowatts by dividing by 1000, then multiply by usage hours.
6. How many units does a 1000W appliance use?
A 1000W appliance uses 1 unit per hour because 1000 watts equals 1 kilowatt.
7. How many units does a 1500W AC use in 8 hours?
A 1500W AC running for 8 hours uses about 12 kWh units before considering compressor cycling and efficiency.
8. Does actual electricity bill match this calculator exactly?
Not always. Real bills may include slab rates, fixed charges, taxes, fuel surcharge, meter rent, and other charges.
9. What is kWh?
kWh means kilowatt-hour. It measures energy used over time.
10. What is watt?
Watt is a unit of power. It shows how much electricity an appliance uses at a given moment.
11. How do I reduce electricity cost?
Use efficient appliances, reduce unnecessary usage, choose LED lights, maintain AC temperature, and switch off standby devices.
12. Does inverter AC use less electricity?
Inverter ACs can use less electricity because they adjust compressor speed, but actual savings depend on usage, temperature, room size, and star rating.
13. How much electricity does a fan use?
A typical ceiling fan may use around 50W to 80W depending on model and speed.
14. How much electricity does a geyser use?
A geyser may use around 1500W to 3000W while heating, depending on capacity and model.
15. How much electricity does a refrigerator use?
A refrigerator power rating varies widely. Actual consumption depends on compressor cycle, star rating, size, usage, and room temperature.
16. Can I calculate multiple appliances?
Yes, enter the number of appliances to estimate total cost for multiple similar devices.
17. What rate should I enter?
Enter your average electricity rate per unit from your electricity bill. If you are unsure, use an approximate local average.
18. Why is my bill higher than appliance cost?
Bills often include more appliances, fixed charges, taxes, slab rates, and other fees beyond one appliance calculation.
19. Can this calculator be used outside India?
Yes, the kWh formula works worldwide. Replace the rate with your local currency rate per kWh.
20. Is this electricity cost calculator free?
Yes, HQCalc electricity cost calculator is free and works instantly in your browser.