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Electricity Cost Calculator

What an appliance costs to run per hour, day, month and year.

Calculators Reviews Free · no sign-up
Power rating

Check the rating label on the appliance.

On your electricity bill.

Your appliance list

Add several to see which ones genuinely drive the bill.

ApplianceWattsHrs/daykWh/yrCost/yr

Cost per year

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Per hour—
Per day—
Per week—
Per month—
Energy per year—

Quick Tool Overview

The Electricity Cost Calculator turns an appliance's wattage, its hours of use and your tariff into what it costs to run by the hour, day, month and year, with the energy used shown in kilowatt-hours alongside.

What it does
Calculates the running cost of an appliance over time
You give it
Watts, hours of use per day and your price per kWh
You get back
Cost per hour, day, month and year, plus kWh used
Best for
Cutting energy bills, comparing appliances and standby audits
Calculators Free, unlimited use No sign-up Runs in your browser

About the Electricity Cost Calculator

Enter an appliance's power in watts, how long it runs, and your electricity price per kilowatt-hour to see what it costs by the hour, day, month and year. The energy used is shown in kilowatt-hours alongside the cost.

The annual figure is the one that changes behaviour. A 2,000-watt heater run four hours a day costs far more over a winter than most people expect, while a device drawing five watts on standby costs very little however irritating it feels. Seeing several appliances in one list makes the real priorities obvious: heating, cooling, hot water and tumble drying dominate most bills, and everything else is rounding.

Key features of the Electricity Cost Calculator

The annual figure

A 2,000-watt heater run four hours a day costs far more over a winter than most people expect — that is the number that changes behaviour.

Standby costs in perspective

A device drawing five watts costs very little however irritating it feels, which the yearly total makes plain.

Compare several appliances

Seeing them in one list makes the real priorities obvious: heating, cooling, hot water and tumble drying dominate most bills.

kWh shown alongside cost

The energy figure is what your bill is actually metered in, so it is reported too.

Any tariff

Enter your own price per kilowatt-hour rather than a national average.

How to use the Electricity Cost Calculator

  1. 1

    Find the wattage

    Check the rating label on the appliance or its manual. It is usually given in watts or kilowatts.

  2. 2

    Enter the hours of use

    How many hours a day the appliance actually runs, not how long it is plugged in.

  3. 3

    Add your tariff

    Enter your electricity price per kilowatt-hour, which is on your bill.

  4. 4

    Compare appliances

    Add several devices to the list to see which ones genuinely drive your bill.

Frequently asked questions

Multiply the wattage by the hours used, divide by 1,000 to get kilowatt-hours, then multiply by your price per kWh. A 2,000 W heater for 4 hours uses 8 kWh.

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