About
I built Chalk Calculator, a set of free calculators for pay, mortgages, loans, home projects and everyday math. The idea came from ending up on calculator sites that hand you a number and nothing else no formula, no assumptions, no way to check whether the answer applies to you. Some of them are quietly wrong. So every page shows the formula, a worked example with real numbers, the assumptions it made, and what it cannot tell you. There are no accounts and no tracking of what you type: it is a static site with no server, so your salary or loan balance never leaves your browser.
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Joined Product HuntSeptember 10th, 2026
