Contact Us

Have a question, spotted a bug, or want to request a calculator we don't offer yet? We'd genuinely like to hear from you. numCruncher is shaped by reader feedback — a good portion of our tools and many of the improvements to existing ones came directly from messages like the one you're about to send. Fill out the form below and we'll get back to you.

The most helpful things to reach out about include: bug reports (if a calculator returns a result that looks wrong, tell us the numbers you entered so we can reproduce it), calculator requests (describe what you'd like to compute and we'll consider adding it), corrections to any explanation or formula, and general feedback on how the tools could be clearer or more useful. We typically reply within two to three business days, and we read every message personally.

What Happens to Your Message

Your message is sent directly to our team and used only to respond to your inquiry. We don't add you to a mailing list or share your details with third parties. The calculators themselves never transmit the figures you enter — those stay in your browser — and this contact form is the one place where information you submit actually reaches us, so please don't include sensitive personal data like account numbers or passwords in your message.

Before You Write

If your question is about how a specific calculator works, the answer may already be on that tool's page — each one includes a detailed explanation, worked examples, and a frequently asked questions section beneath the calculator. If you still need help after checking, send us the details and we'll be glad to walk through it with you.