Tool library

Electricity calculators

Pick a task, enter your own tariff and get a transparent estimate. All calculations run locally in your browser.

Electricity cost calculator

Price any electrical device from watts, hours and your tariff.

Calculator

Watts to kWh converter

Convert power and time into energy used.

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Heater running cost calculator

Estimate portable electric-heater running cost.

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Air fryer running cost calculator

Calculate one session, a week or a month.

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Tumble dryer running cost calculator

Estimate electricity used by a tumble dryer.

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Washing machine running cost calculator

Turn machine wattage and cycle time into cost.

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Gaming PC electricity cost calculator

Estimate energy cost for gaming or workstation use.

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Air conditioner running cost calculator

Estimate AC running cost using input power.

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Dehumidifier running cost calculator

Price long daily run-times without guesswork.

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EV charging cost calculator

Estimate a charging session and driving-energy cost.

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Solar savings calculator

Estimate the annual value of solar generation.

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Fridge freezer running cost calculator

Estimate the always-on running cost of a fridge or fridge-freezer.

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No matching calculator yet. Try a broader search such as “heating”, “EV” or “kWh”.

Want answers at real prices? See UK appliance running costs at the Ofgem price cap, or nos calculateurs en français au Tarif Bleu.