PunchClockCalc is a small collection of free, fast calculators for everyday time math: adding up a weekly time card, working out the hours between two times, calculating overtime pay, converting an hourly wage to a salary, converting time to decimal hours, and converting military (24-hour) time.
Why we built it
Counting hours by hand is easy to get wrong—minutes roll over at 60, shifts cross midnight, and payroll wants decimal hours. These tools are meant for hourly workers, small-business owners, freelancers and managers who need a quick, correct answer without installing an app or creating an account.
How the tools work
- Everything runs in your browser. Times you enter are never sent to our servers.
- Time cards are saved only in your browser's local storage so you can come back later.
- Calculations are kept in whole minutes and rounded only for display.
Accuracy
We test the calculation logic against edge cases such as overnight shifts, breaks and overtime. Results are estimates for planning and record-keeping—they are not legal, tax or payroll advice. Overtime rules vary by state and employer, so confirm pay questions with your employer or the U.S. Department of Labor.
Contact
Found a bug or want a new calculator? Email contact@punchclockcalc.com.