About these calculators
UK Home Energy Calculators is a small, independent set of free tools for people weighing up heat pumps, home batteries, tariffs and electric cars. Every calculation is shown on the page it's used, so you can check the working.
Disclaimer
The results are estimates based entirely on the figures you enter and the simplifying assumptions explained on each page. They are not financial, electrical, engineering or installation advice. Prices and grants change; check current figures with your supplier and on GOV.UK. Before buying or installing anything, get a survey and quotes from qualified, certified installers. Electrical work must be carried out and certified by a competent person.
Privacy
The calculators run entirely in your browser. The figures you type are saved in your browser's local storage so they're still there next time, and are never sent to us. This site does not currently use cookies or analytics.
Affiliate links
Some pages may in future include clearly labelled affiliate or sponsored links. If you buy through one, we may earn a commission at no extra cost to you. It never changes the calculations.