About Overtime Hours Calculator

Overtime Hours Calculator is a small, independent project built to remove the fiddly part of payroll time math: converting punch times into decimal hours, figuring out time-and-a-half pay, adding up shift durations, and reading a time card without reaching for a spreadsheet formula you have to re-derive every time.

Each tool on this site does one job. There's a calculator for turning hours and minutes into decimal hours, one for the reverse conversion, one for adding multiple time entries together, one for building a simple time card, and a reference chart for minutes-to-decimal lookups. None of them try to be an all-in-one payroll suite — that's on purpose. A single-purpose tool is easier to trust and easier to check.

Every calculator runs entirely in your browser. There's nothing to upload and no account to create. The code that does the math ships with the page and runs on your device; nothing you type is sent anywhere.

The math itself follows public, well-documented rules: the U.S. Fair Labor Standards Act's basic overtime principle (time and a half for hours worked beyond 40 in a week, subject to your state's or role's own rules), and the plain arithmetic of dividing minutes by 60 to get a decimal figure. Where it's useful, the calculators show their working — the intermediate steps, not just a final number — so you can verify the result against your own math instead of taking it on faith.

This site is built and maintained by a solo developer. It isn't backed by a payroll company, a law firm, or a large team, and it doesn't claim to be. If you find a calculation that looks wrong, a wording that's unclear, or a bug, corrections are genuinely welcome — please use the contact page to send details.