A time clock records the exact minute you start and stop. Payroll then turns those punches into hours — often after rounding them — and multiplies by your rate. This calculator does that for a single shift, step by step, so you can check one day of your pay stub or work out what a shift is worth before you take it.
How to use the time clock calculator
- Enter your clock in and clock out times exactly as punched.
- Add the unpaid break in minutes, such as a 30-minute lunch. Leave paid rest breaks out.
- Enter your hourly rate if you want the pay for the shift.
- Choose your employer’s rounding rule. Pick Exact minute if punches are not rounded.
- Choose a daily overtime rule only if your state or contract pays overtime by the day.
The tape shows the rounded punches, the time on the clock, the hours worked in h:mm and decimal form, and the pay. A timeline under the result draws the shift on a clock.
Time clock formula
If clock out is earlier than clock in, 24 hours are added first because the shift crossed midnight. For payroll, minutes are converted to a decimal:
Worked example
You clock in at 7:52 AM and out at 4:38 PM, take a 30-minute unpaid lunch, earn $18.50 an hour, and your employer rounds to the nearest 15 minutes.
- Round the punches: 7:52 is 7 minutes past 7:45, so it becomes 7:45 AM; 4:38 is 7 minutes before 4:45, so it becomes 4:45 PM.
- Time on the clock: 4:45 PM − 7:45 AM = 9:00.
- Subtract lunch: 9:00 − 0:30 = 8:30, which is 8.50 hours.
- Pay: 8.50 × $18.50 = $157.25.
Without rounding the same shift is 8 hours 46 minutes on the clock minus 30 minutes, or 8:16 (8.27 hours), worth $152.93 — the rounding added 14 minutes here. On another day it will take minutes away; that balance is what makes rounding lawful.
Punch rounding rules compared
| Rounding | Rounds to | Example punch | Recorded as |
|---|---|---|---|
| Nearest 5 minutes | :00, :05, :10 … | 8:02 | 8:00 |
| Nearest 6 minutes | tenths of an hour | 8:04 | 8:06 |
| Nearest 15 minutes | :00, :15, :30, :45 | 8:07 / 8:08 | 8:00 / 8:15 |
The 6-minute option exists because many payroll systems pay in tenths of an hour (0.1 h = 6 minutes). The quarter-hour version is the classic “7-minute rule.”
Daily overtime options
| Option | Regular | 1.5× | 2× |
|---|---|---|---|
| None | all hours | — | — |
| Over 8 hours | first 8 | after 8 | — |
| California | first 8 | 8–12 | after 12 |
A 13-hour California shift is therefore 8 regular hours, 4 hours at time and a half and 1 hour at double time. The Fair Labor Standards Act itself only requires overtime after 40 hours in a workweek, so to see weekly overtime, enter all your shifts in the time card calculator or the work hours calculator.
Tips for checking your punches
- Compare the rounded punches, not your memory, with the times on your pay stub.
- If you see a pattern of rounding only in the employer’s favor, ask payroll for the written policy.
- Keep breaks honest: a meal period counts as unpaid only if you were fully relieved of duty. If you answered calls through lunch, that time is work time.
- To convert a single h:mm figure without a shift, use the time to decimal calculator.
Pay shown is gross, before taxes and deductions, and is an estimate. Your employer's timekeeping records and state law determine the final amount.
Frequently asked questions
What is the 7-minute rule for time clocks?
When punches are rounded to the nearest quarter hour, a punch 1 to 7 minutes past a quarter hour rounds down and a punch 8 to 14 minutes past rounds up. Clocking in at 7:52 counts as 7:45; clocking out at 4:38 counts as 4:45.
Is time clock rounding legal?
Federal rules (29 CFR 785.48) allow rounding to the nearest 5 minutes, tenth of an hour or quarter hour if it is neutral over time — sometimes in the employee's favor, sometimes the employer's. A policy that only ever rounds down is not allowed. Some states restrict rounding further.
How do I calculate hours from a time clock punch?
Subtract the clock-in time from the clock-out time and remove any unpaid break. From 7:45 AM to 4:45 PM is 9 hours; minus a 30-minute lunch leaves 8 hours 30 minutes, or 8.5 decimal hours.
Can this calculator handle a shift that ends after midnight?
Yes. If the clock-out time is earlier than the clock-in time, the shift is treated as ending the next day — 10:00 PM to 6:30 AM is 8 hours 30 minutes.
Why does the calculator show daily overtime separately?
Federal overtime is weekly, so one shift alone usually has no overtime. A few states and many union contracts pay overtime after 8 hours in a day, and California also pays double time after 12, so the daily option shows how a long shift would be split.