What does this tool do?
The Electricity Bill Calculator lets you add each appliance in your home and estimate your monthly and yearly electricity cost. Using each device's wattage, daily hours of use, and days per month, it shows kWh consumption and the real monetary cost at your chosen rate.
How to use it
- Enter your values into the fields.
- The result is calculated instantly.
- Read or copy the result.
How the calculation works
For each device, consumption is found with: (watts × hours/day × days/month) ÷ 1000 = monthly kWh. That value is multiplied by your per-kWh rate to give the monthly cost. You start with example devices like a refrigerator, TV, laptop, air conditioner, and LED lights; you can edit rows, add new devices, or remove them. The summary at the bottom shows total kWh, monthly cost, and yearly cost, and you can pick the currency as $, €, £, ₺, or ₹.
Tips to lower your bill
High-wattage devices like air conditioners and electric heaters are the most expensive rows in the table; trimming a few hours of daily use makes a visible difference over a year. You can instantly see the effect of swapping old bulbs for LEDs by lowering the wattage. Enter realistic hours for devices left on standby to spot 'phantom' consumption, and pull your exact kWh rate from your bill to work with real numbers.
Frequently asked questions
Where do I find my per-kWh rate?
The rate usually appears on your electricity bill as the 'unit price' or 'price per kWh'. You can also approximate it by dividing the bill's energy charge by the total kWh consumed; the real figure may vary slightly due to distribution and tax line items.
I don't know my device's wattage—what should I do?
Wattage is printed on the label on the back of the device, in its manual, or on the power adapter. If unknown, use typical values for similar devices (e.g., a fridge ~150 W, a laptop ~65 W) as a starting point.
Will the results exactly match my real bill?
This is an estimate. Taxes, fixed fees, tiered tariffs, and seasonal usage all affect the real bill. Still, it gives a strong per-device comparison so you can see which consumption drives your cost the most.
Is Electricity Bill Calculator free?
Yes. Electricity Bill Calculator and all 300+ tools on MagmaNex are completely free with no signup or account required.
Is my data safe?
Yes. Everything runs locally in your browser. The data you enter is never sent to a server, stored, or shared.
Does it work on mobile?
Yes. Electricity Bill Calculator works on phones, tablets and desktops — no app download needed.
🔒 Privacy: everything runs in your browser, your data is never sent to a server.