Contact

Found a mistake, or have an idea for a calculator? Email hello@mathlark.com. There's no form on this site, so your message goes straight from your own email app.

Report a mistake

Accuracy matters more to us than anything else, so we'd like to hear about any result that looks wrong. It helps to include:

• which calculator you used
• the numbers you entered (the Share button gives you a link with them filled in)
• the result you expected, and where that number came from if you have a source

We check every report against published sources before changing a formula.

Suggest a calculator

Tell us what you'd like to work out. Mathlark only builds tools that run on pure math, so we can't add ones that depend on changing data like tax rules, exchange rates, or interest rate feeds.

Your privacy

The calculators never collect your numbers. A share link does contain the numbers you entered, so only include one if you're happy to share them. We use your email address only to reply to you.