PunchFree · formula shown · no signup
Hours calculator
Clock in, clock out, and any unpaid break — your hours and pay, counted in front of you. Overnight shifts handled.
The federal overtime threshold: past 40 in a workweek, non-exempt hourly work pays more (FLSA).
Time and a half — the federal overtime multiplier. Some states go further; your stub is the authority.
What these calculators cost, forever. No signup, no ads, and nothing you type leaves your browser.
Overtime basics: US Department of Labor, Fair Labor Standards Act. Rules vary by state and contract.
All the calculators
Time Card CalculatorA week of clock-in, clock-out and lunch times totaled into hours and pay.
Overtime CalculatorRegular and overtime pay at 1.5× past 40 hours (both editable).
Time and a Half CalculatorYour 1.5× rate, and what a batch of overtime hours pays.
PTO Accrual CalculatorHow fast paid time off adds up per pay period.
Mileage Reimbursement CalculatorMiles times your rate — with a pointer to the current IRS rate.
Military Time Converter1730 to 5:30 PM and back, with the full 24-hour chart.
Minutes to Decimal Converter7:38 to 7.63 for payroll, with the standard chart.
Why this is free
Here is the whole model, plainly: these calculators are free, they run in your browser, and they send us nothing. The same builder runs paid products elsewhere (Jon's Reminders, RentChime) — those pay the bills. PunchMath exists because paycheck arithmetic should be checkable by the person being paid.
Every page shows its formula for the same reason a referee shows the replay: if you can check the work, you don't have to take anyone's word for it.
How this is calculated
Hours = clock-out − clock-in − unpaid break minutes. If clock-out is earlier than clock-in, the shift is treated as crossing midnight and 24 hours are added first. Pay = hours × rate.
The result shows decimal hours (8.50) and hours:minutes (8:30) because pay stubs use the first and schedules use the second.
Common questions
Is anything I type saved or sent anywhere?
No. The math runs entirely in your browser. Nothing you enter is sent to us or stored.
How do decimal hours work?
Payroll uses decimal hours: 8 hours 30 minutes is 8.50, because 30 minutes is half an hour. The calculator shows both formats so you can check either against your pay stub.
What about overtime?
Overtime is figured per workweek, not per shift, so it lives in the time card calculator — enter your week there and hours past 40 are split out at 1.5× automatically.
Who makes this
Built by one person, in the open.
PunchMath is made by Jon, a product designer outside Chicago, as part of a small family of honest tools — including Jon's Reminders, a consent-first text reminder service he built for his own parents.
These are arithmetic tools, not payroll or legal advice. Pay rules vary by state and employer.