Get in Touch
The best way to reach us is by email. Whether you've spotted a bug in one of the calculators, have an idea for a new tool, disagree with something in a guide, or just want to tell us the calculator saved your wall from another unnecessary hole — we'd like to hear it.
What to Include
Reporting a calculator issue? Tell us which calculator, the numbers you entered, the result you got, and the result you expected. With those four things we can usually reproduce and fix a problem the same week.
Suggesting a feature or new calculator? Describe the hanging problem you were trying to solve — the situation matters more than the proposed solution, and real scenarios are where every tool on this site started.
Found an error in a guide? Point us to the page and the claim. We'd rather correct it than defend it.
A Note on Privacy
The calculators run in your browser and your measurements stay on your device. Like most free sites we use Google Analytics and ads, which use cookies. When you email us, we receive your email address and message. We don't add correspondents to mailing lists, and we don't share email addresses with anyone. See our privacy policy for the full details.