Data, sources & limits

Every public number on this site can be traced to a source or a documented calculation. This page explains where the figures come from and — just as importantly — what they don't mean.

Electricity price

We use the Ofgem energy price cap electricity unit rate, currently 26.11p per kWh (Q3 2026 (Jul–Sep)), with a standing charge of 57.19p/day. This is the average capped rate for a typical direct-debit customer in England, Scotland and Wales, including VAT. It is reviewed quarterly. Source: Ofgem. Last updated 9 July 2026.

Appliance wattages

Appliance power figures are typical published values, not measurements of any specific product. Because real appliances vary widely, each is shown as a low–typical–high range. They are compiled from public sources including the Energy Saving Trust, manufacturer specifications and energy labels.

How we model tricky appliances

Fridges and freezers cycle on and off, so we use an average continuous draw across the day.
Washing machines and dishwashers vary through a cycle, so we use an effective average so an hour of use approximates a typical cycle.
Ovens cycle their elements, so real use is usually below the rated power.
Hot tubs vary enormously by season and insulation; our figure is an illustrative winter average.

These are estimates. They exist to help you compare and plan, not to predict your bill to the penny. Your tariff, region, appliance model and habits all change the real number. For an exact figure, enter your own rate and usage in the calculator, or measure a specific appliance with a plug-in energy monitor.

What we don't do

We don't present any figure as a measured fact for a specific product, we don't scrape third-party sites, and we don't invent numbers. The full provenance is kept in the project's data/SOURCES.md file.