About
Napkin Maths
Free calculators for everyday money, business and home decisions. Built as a lightweight static site — no account required.
What this site is
Napkin Maths is a collection of simple calculators. Each page runs in your browser: you enter figures, and the page shows an estimate. We do not store your inputs on a server as part of the calculator itself.
What it is not
Results are estimates for education and planning only. They are not financial, tax, legal, medical or professional advice. Always check important decisions with a qualified professional and the latest rules that apply to you.
Contact
Questions or corrections: see the contact page. Privacy details are on the privacy page.