Electricity Cost Calculator Widget

Add an electricity cost calculator to your website. Visitors list up to eight appliances with their wattage, hours of use per day and quantity, enter the price per kWh from their bill, and see the daily, monthly and yearly energy use and cost, appliance by appliance.

Electrical & Electronics Calculator Runs in your browser Free · no ads

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Theme
Auto follows the visitor's light/dark setting.
Style
Attribution on your page
Optional and entirely your choice. The exact line is shown in the code below; it links to the tool with rel="nofollow".
More options
Starting values
Leave blank to use the widget's defaults. Visitors can still change every value.

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Exactly what your visitors will see

Embed code

<iframe src="https://a2z.tools/embed/w/electricity-cost-calculator" title="Electricity Cost Calculator by A2Z Tools" width="100%" height="1030" style="border:0;width:100%" loading="lazy" allow="clipboard-write"></iframe>

A plain iframe. Works everywhere, including site builders that strip scripts. Adjust height if your content needs more room.

Works with

How it works

The widget uses the same formula as the A2Z Electricity Cost Calculator - watts x hours / 1000 gives kilowatt-hours, the unit on every electricity bill - and extends it to a list of appliances. Each appliance's share of the total is shown as a bar and in a table, which makes the big consumers obvious. The tariff is the visitor's own figure; fixed charges, taxes and time-of-use rates are not included. The publisher can preset the currency, tariff and appliance list.

Calculation method

  • kWh per day = watts x hours per day x quantity / 1000
  • Monthly kWh = daily x days in the month (30 by default); yearly = daily x 365
  • Cost = kWh x price per kWh; share = appliance kWh / total kWh

Worked examples

1 kW heater for an hour a day

Inputs: Heater 1,000 W, 1 h a day, qty 1, tariff 0.15 per kWh, 30-day month

Result: 1 kWh a day; 4.50 a month; 54.75 a year

1,000 x 1 / 1,000 = 1 kWh; 30 x 0.15 = 4.50; 365 x 0.15 = 54.75.

Limitations

  • Uses one flat unit rate: slab or tiered tariffs, time-of-use pricing, standing charges and taxes are not applied.
  • Standby consumption and thermostat cycling are only included if the visitor enters them.

Where publishers use it

  • Energy-saving articles comparing old and efficient appliances
  • Appliance retailers showing the running cost of a product
  • Landlords and student-housing sites explaining utility bills
  • Utility and energy-advice websites

Questions

Where do I find the price per kWh?

On your electricity bill, usually as the unit rate or energy charge. If there are several slabs or time bands, use the one most of your usage falls in or an average.

What wattage should I enter for a fridge or air conditioner?

Their compressors switch on and off, so the rated wattage overstates use. Enter the average draw from a plug-in energy meter, or the rated watts with the hours the compressor actually runs.

Can I preset the appliances?

Yes, with ?v_items=Fan:75:8:2|TV:100:4:1 (name:watts:hours:quantity), plus v_tariff and v_days.

Does it include standing charges and tax?

No - only the energy charge. Fixed monthly charges and taxes vary by supplier and should be added separately.

Cite or recommend this tool

If you reference this tool in an article, course or documentation, these formats are ready to copy. They are optional - nothing is added to your site unless you paste it.

A2Z Tools Electricity Cost Calculator
https://a2z.tools/electricity-cost-calculator

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