Contact CalcStack

The quickest way to reach us is email: [email protected]. A real person reads every message, and we aim to reply within two working days. There's no ticketing system and no chatbot — just us.

CalcStack is a small UK operation, so please bear with us at busy times. If your message is about a specific calculator, telling us which one (and the numbers you put in) helps us sort it far faster.

Found a wrong number? Tell us

We build these tools around current UK tax rates, thresholds and regulations, but rules change and mistakes happen. If a result looks off — a tax band that's out of date, a stamp duty figure that doesn't match your solicitor's — we genuinely want to know. Corrections get priority.

Email [email protected] with the subject “correction” and, if you can, the tool name and the figures you entered.

Suggest a tool or feature

Most of our calculators started life as a request from someone who couldn't find the tool they needed anywhere else. If there's a UK calculation you keep doing by hand, send it over — we add new tools regularly and reader suggestions jump the queue.

Business, partnerships and press

For commercial enquiries, licensing a calculator, advertising, or press questions, email us at [email protected] with a line about who you are and what you have in mind.

Data and privacy requests

Have a question about your data, or want to make a request under UK GDPR? Email [email protected]. For the full detail on what we collect and why, see our Privacy Policy.

Who you're contacting

CalcStack is built and maintained by Flavoureak UK Ltd, a company registered in England and Wales (Company No. 15922329), founded by Jeff Barry and based in Wales. You can read more about CalcStack or visit the wider Flavoureak company site.