About Tonic

Tonic is a collection of free calculator tools built for UK individuals. The goal is simple: help people get clear, accurate answers to the financial questions that matter most.

Most existing calculator websites are outdated, cluttered with ads, or oversimplify the complexities of UK taxation. Tonic aims to be different — modern, transparent, and precise.

Principles

• Accuracy first — Calculations are based on published HMRC rates and are tested against known values.
• Transparency — All assumptions are visible. Nothing is hidden.
• No financial advice — Tonic provides estimates and information, not recommendations. Always consult a professional for personal financial decisions.
• Free and open — No sign-up, no paywall, no ads.

Support this project

Tonic is a community-supported project. If you find it useful, you can help keep it running: