About Numwise
Free calculators for UK homes, gardens, pets and cars, with every figure sourced and dated.
What Numwise is
Numwise has 58 free calculators and cost guides. They use UK sizes, UK prices and UK rules: bag and tin sizes that UK shops sell, the Ofgem energy price cap, HMRC mileage rates and the Highway Code.
You don't need an account, and nothing you type is stored. Every result can be shared through its page address.
Who runs it
Steven Stewart runs Numwise. He builds each calculator and checks its figures against official UK sources before it goes live. More about Steven.
How we make sure it's right
- Figures come from official bodies first, such as Ofgem, HMRC, GOV.UK and the Energy Saving Trust, then from manufacturers' specifications.
- Every calculator is tested against sums worked out by hand before it goes live.
- Every page shows its sources and the date it was last checked.
- Prices that change on a schedule are updated when the new figures come out, and the site stops itself publishing if a price period has ended.
The full detail is in our editorial policy, and every update is listed on the changes page.
How the site is funded
Numwise is free and has no adverts or paid links at the moment. In future it may carry adverts or links to products or services that pay us a fee. If it does, they will be clearly labelled, and they will never change what a calculator tells you. How we keep this independent.
Get in touch
Spotted a mistake, or want a calculator we don't have yet? Email [email protected]. See the contact page for more.