About

Last updated: 2026-07-20

What this site is for

Electricity bills are quoted in kilowatt-hours, but nobody thinks in kilowatt-hours. People think in money: is it expensive to leave this on? WattFigures exists to close that gap. Every page here turns a power rating into what it actually costs you — per day, per month and per year, at your own price per kWh.

It is built for the moment you are standing in front of an appliance wondering whether it is worth unplugging, or looking at a bill that is higher than last month and trying to work out which thing in the house is responsible.

Who runs it

WattFigures is built and run by two people, not a faceless brand. Oscar S. handles the calculators and the numbers behind them — sourcing typical wattages, checking them against energy-label data, and keeping every formula visible instead of hidden. Daniel A. handles the guides, the appliance pages and the editorial line: estimates labelled as estimates, and corrections prioritised over new content. The byline on individual pages currently defaults to Oscar as the site's signing editor; both of us are responsible for what gets published.

How it is different from an energy company's page

Most running-cost pages online are published by companies that also sell you electricity, boilers or appliances. That is not automatically wrong, but it shapes what they tell you. We have nothing to sell you and no tariff to switch you to, so the figures do not need to flatter anything.

Three principles follow from that:

• The formula is always on the page. We show the arithmetic instead of a proprietary "efficiency score" you cannot check. Enter the same numbers, get the same answer.
• Every price is editable. We start you at a typical rate for your country, but the number that matters is on your own bill — so you can type it in everywhere.
• We say what we exclude. Standing charges, taxes and time-of-use pricing are not in our figures, and we say so on every page rather than implying false precision.

What we publish

• Calculators for the specific questions people actually ask: what an appliance costs to run, what standby drain adds up to, EV home charging, heat pump versus gas, solar payback.
• Appliance running-cost pages for 30 common household devices, each with typical power draw, realistic usage and yearly cost.
• A whole-home estimator that adds up everything you plug in and shows where the money goes, month by month, with a solar what-if.
• Electricity prices for 23 countries, with the main retailers in each, so the numbers work wherever you live.
• Guides for the things a calculator cannot answer on its own — reading your bill, hunting standby loads, understanding time-of-use tariffs.

The site is published in English and Spanish, with every page available in both.

Editorial standards

Figures are estimates, and we label them as estimates — never as your bill. Appliance wattages are cross-checked against energy-label data and published typical ranges rather than a single source, and price data carries the date it was compiled. The full detail of how every number is produced, including the assumptions we make and the things we deliberately leave out, is on the how we work page.

When we get something wrong we fix it and prioritise the correction over new content. If you spot an error, please tell us.

How the site is funded

WattFigures is free to use, with no account and no newsletter wall. It is funded by advertising. Advertising never determines which appliances we cover, what the calculators say, or which retailers appear in the price tables — those come from the dataset and the formula, not from who is paying. Our disclosures page sets this out in full.

Contact

Corrections, data errors, questions and press enquiries all go to the same place: our contact page. Corrections get answered first.