We genuinely want to hear from you. CalcHub is an independent project, and reader feedback is how it gets better — whether you've found an error in a calculation, have a question about the methodology behind a tool, or want to suggest a new calculator we should build.
Email us
The best way to reach us is by email at carlo.deldonno@gmail.com. A real person reads every message, and we aim to respond within a few business days.
What to get in touch about
- Corrections. If you believe a formula, rate, or assumption in one of our calculators is wrong or out of date, tell us. We take accuracy seriously and will investigate every report and update the tool if needed.
- Calculator requests. Is there a calculation you wish existed? Many of our tools started as a single reader's suggestion. Tell us what you're trying to work out.
- Methodology questions. Want to understand the math or the sources behind a result? We're happy to explain how any calculator works.
- Feedback. Found something confusing, or have an idea to make CalcHub clearer or more useful? We read everything.
- Press & partnerships. For media inquiries or collaboration, email us with the details and we'll get back to you.
Who runs CalcHub
CalcHub is built and maintained by Carlo Del Donno. It's an independent site with a simple mission: provide accurate, genuinely useful calculators — with the methodology shown openly — for the financial, health, and technology questions people are actually asking. You can read more on our About page.
Response time
Because CalcHub is run independently, please allow a few business days for a reply, and a little longer during busy periods. Every message is read by a person, not an autoresponder.