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Electricity Bill Calculator

Calculates what an appliance costs to run per day, month and year from its wattage, hours of use and your tariff.

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In short Electricity Bill Calculator is a free online tool on inputtesthub.com that calculates what an appliance costs to run per day, month and year from its wattage, hours of use and your tariff. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Electricity Bill Calculator

  1. Enter your figures in the input fields.
  2. The result updates as you type, together with the full working.
  3. Check the breakdown table to see exactly how the number was reached.

About the Electricity Bill Calculator

The Electricity Bill Calculator calculates what an appliance costs to run per day, month and year from its wattage, hours of use and your tariff. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Working out what an AC actually costs per month.
  • Comparing an old fridge against a new one.
  • Finding which appliance is driving a high bill.

Details

1 kWh1,000 watts for one hour
1.5 ton AC≈ 1,500 W running
LED bulb7–12 W
FridgeCycles — averages ⅓ of plate rating

The maths behind it

This tool uses kWh per day = watts × hours × quantity ÷ 1,000. Cost = kWh × tariff. Every intermediate value is shown on screen, so the result can be checked by hand.

Use the running wattage, not the sticker on the back. A fridge cycles on and off and averages roughly a third of its plate rating, and an inverter AC draws far less once the room reaches temperature. Many tariffs are also tiered, so later units cost more than the first ones; this uses a flat rate.

Explained in our guides

All guides

Frequently asked questions

Is the Electricity Bill Calculator free?
Free, unlimited, and no email address required. You can use it a hundred times a day and nothing changes.
Is what I paste into the Electricity Bill Calculator stored?
No. The Electricity Bill Calculator runs entirely in your browser using JavaScript. Your input never reaches inputtesthub.com or any third party — open your browser's Network tab while you use it and you will see no request go out.
How is the result calculated?
It uses kWh per day = watts × hours × quantity ÷ 1,000. Cost = kWh × tariff. The full working is printed under the result, so you can follow every step rather than trusting a black box.
When would I actually need the Electricity Bill Calculator?
The jobs it is built for: working out what an AC actually costs per month. Comparing an old fridge against a new one. Finding which appliance is driving a high bill. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is there a catch?
Use the running wattage, not the sticker on the back. A fridge cycles on and off and averages roughly a third of its plate rating, and an inverter AC draws far less once the room reaches temperature. Many tariffs are also tiered, so later units cost more than the first ones; this uses a flat rate.
What figures does the Electricity Bill Calculator work from?
1 kWh is 1,000 watts for one hour. 1.5 ton AC is ≈ 1,500 W running. LED bulb is 7–12 W. These are printed on the page itself, so you do not have to take them on trust.
Is the number rounded?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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