Contact CalcBoxes
Questions, bug reports, or a calculator you’d love us to build? Send us a message — a real person reads every one.
CalcBoxes is a small, independent project run by one person who cares about getting the numbers right. If a result looks wrong, a tool behaves oddly on your device, or you have an idea that would make a calculator more useful, we genuinely want to hear it. Your feedback is the main way these tools get better.
Email us
The quickest way to reach us is by email at [email protected]. We aim to reply within two to three working days. There is no automated ticketing system and no call centre — messages come straight to us.
What people usually write to us about
- Corrections: a result you believe is inaccurate, a formula you’d like double-checked, or a rounding choice you’d handle differently.
- Bug reports: a button that doesn’t respond, a layout that breaks on your screen, or a converter that won’t update.
- New tool requests: a calculator or conversion you keep searching for and can’t find here.
- Accessibility feedback: anything that makes a tool hard to use with a keyboard, screen reader or larger text.
- General questions about how a particular calculation works.
We can’t give personalised financial, medical or legal advice — the finance and health tools are educational estimates, not professional guidance. For those decisions, please speak to a qualified professional.
Send a message
You can also use the form below. It opens your email app with the details ready to send.
What to include
If you’re reporting a problem, telling us which tool you were using and what device or browser you’re on helps us fix it faster. A screenshot is worth a thousand words if something looks broken. If you’re suggesting a new calculator, a quick note on what you’d use it for helps us design it around a real need rather than guessing.
A note on your privacy
We only use the details you send to reply to your message — nothing more. We don’t add you to a mailing list or share your email with anyone. The calculators themselves run entirely in your browser and don’t send your inputs anywhere. You can read the full details in our privacy policy.
Prefer to explore instead?
If you were looking for a specific tool, you can jump straight to our most popular ones: the age calculator, percentage calculator, BMI calculator and loan calculator, or browse everything from the homepage.