About

calc-hq.com is five calculators — markup, profit margin, gross profit, CAGR, and time card — each built to answer one question, show the formula behind the answer, and stop there.

Plain arithmetic, not tax tables

Every calculator here is a formula: markup, margin, gross profit, and CAGR are the same equations this year, next year, and the year after. There's no tax bracket to track, no jurisdiction to pick, no rate that changes underneath the page. The math behind each one is explained on its own page, next to the calculator itself, not buried in a separate reference section.

How it works

There are no accounts on this site and nothing to sign up for. The numbers you enter are processed in your browser to produce a result — they're not sent to a server, stored, or shared. Refresh the page and they're gone. More detail on that is in the privacy policy.

Get in touch

Spotted something that looks wrong, or have a question about how a calculator works? Reach out through the contact page.