Changes and updates
Every time we update prices, fix a mistake or add a calculator, we record it here.
Added square metre, roof pitch and stair calculators, the stair one checked against Approved Document K, plus percentage and percentage change calculators.
Opened the Money & pay section with VAT, pro rata salary, hourly to annual salary and savings interest calculators.
Added carpet, skirting board, bark and mulch, and sand calculators.
Added a radiator BTU calculator, an immersion heater cost calculator and running cost pages for 8 more appliances.
Added a car tax calculator using the DVLA rates from 1 April 2026.
Added a dog crate size calculator. Switched the dog age, cat age and cat pregnancy calculators to UK sources: Purina UK, Agria and PDSA. Cat pregnancy now uses PDSA's figure of about 65 days, with 52 to 74 days as the normal range.
Added running cost pages for 20 common appliances, from kettles to tumble dryers.
Checked all energy figures against the Ofgem price cap for October to December 2026: electricity 26.32p per kWh and 54.83p a day standing charge, gas 7.97p per kWh and 29.68p a day.
Updated fuel prices to the GOV.UK weekly figures for the week ending 11 October 2026, and checked HMRC mileage rates for the 2026 to 2027 tax year.
Checked every DIY and pet calculator against its listed sources.
Spotted something out of date? Email hello@numwise.co.uk. Read how we keep figures current in our editorial policy.