Two punches on a card look simple until you have to turn them into a number payroll can use. An in time of 8:52 and an out time of 17:07 is not eight hours and fifteen anything until you deal with base-60 minutes, unpaid breaks and your employer's rounding policy. Learning to calculate hours worked properly takes a few minutes and removes one of the most common causes of pay disputes.
This guide sets out the method step by step: reading the punches, converting leftover minutes into decimal hours, subtracting breaks, totalling a workweek, and handling the shift that runs past midnight. Every figure below can be checked against the free weekly time card calculator, which performs the same arithmetic automatically.
What Counts as Hours Worked?
Hours worked means all the time an employee is required to be on duty, at the workplace, or at a prescribed workstation, plus any time the employer suffers or permits them to work. It is not limited to scheduled shift hours.
The Fair Labor Standards Act (FLSA) sets that definition for most US employers, and the US Department of Labor enforces it. In practice it captures pre-shift setup, post-shift cleanup, required training and work taken home with the employer's knowledge. Very short, irregular stretches that are administratively impractical to capture may be treated as de minimis time, but the exception is narrow and has been read narrowly; California courts have declined to apply the federal de minimis approach to state wage claims at all. If an activity is routine and measurable, record it.
Two grey areas account for most disagreements. Travel between job sites during the working day counts, while the ordinary commute from home to the first site does not. On-call time counts when the employee is so restricted that they cannot use the waiting period for their own purposes, and does not count when they merely have to stay reachable. Neither question is settled by how the time feels; it is settled by how much freedom the employee actually has.
How Do You Calculate Hours Worked Step by Step?
To calculate hours worked for one day, put both punches on a 24-hour clock, subtract the start from the finish, convert the leftover minutes to a decimal by dividing by 60, then deduct any unpaid meal break.
- Write both punches in 24-hour form. 8:52 AM becomes 08:52 and 5:07 PM becomes 17:07, which removes any AM/PM ambiguity before the arithmetic starts.
- Subtract the hours. 17 minus 8 gives 9 hours.
- Subtract the minutes. 07 minus 52 is negative, so borrow an hour: 8 hours and 67 minus 52, which is 8 hours 15 minutes.
- Convert the minutes. 15 divided by 60 is 0.25, so the gross figure is 8.25 decimal hours.
- Deduct unpaid breaks. A 30-minute unpaid lunch is 0.5, leaving 7.75 hours worked for the day.
- Repeat and total. Do the same for each day, then add the daily figures for the workweek.
Doing the subtraction in hours and minutes first, and converting only at the end, is what keeps the result reliable. Trying to subtract 8.52 from 17.07 on a calculator produces a plausible-looking number that is simply wrong.
Converting Minutes Into Decimal Hours
Payroll systems multiply a pay rate by a decimal number, not by hours and minutes, so every daily total of hours worked has to be expressed in decimal hours before gross pay can be worked out. Minutes are base-60 and decimals are base-10, which is why 7:45 is 7.75 hours and never 7.45. That single mistake, repeated across a week, quietly shorts an employee about a third of an hour.
These are the values that come up most often on a time card:
- 10 minutes: 0.17 hours, rounded from 0.1666.
- 15 minutes: 0.25 hours, one quarter of an hour.
- 20 minutes: 0.33 hours.
- 30 minutes: 0.50 hours, the standard unpaid lunch deduction.
- 45 minutes: 0.75 hours, three quarters.
- 50 minutes: 0.83 hours.
The time to decimal converter handles the awkward values, and the longer explanation sits in converting minutes to decimal hours.
Subtracting Breaks From the Daily Total
Under federal rules, short rest breaks of roughly five to twenty minutes are counted as hours worked and paid, while a bona fide meal period of thirty minutes or more is generally unpaid provided the employee is fully relieved of duty. Eating at a desk while still answering the phone is not a bona fide meal period, and that interval stays in the day's hours worked. Several states, California among them, impose their own meal and rest break requirements on top of the federal position, so check the rule that applies where the work is performed. The practical guidance on unpaid versus paid breaks is set out in lunch and break deductions.
Adding Up a Full Week
Daily totals only matter once they are summed across a defined workweek, which under the FLSA is a fixed and regularly recurring period of 168 consecutive hours: seven twenty-four-hour periods that need not match the calendar week. Once the employer fixes it, it stays fixed.
Add the seven daily figures in decimal form. Anything above 40 hours worked in that week is overtime for a non-exempt employee, paid at one and a half times the regular rate. A few states add a daily trigger as well; California pays overtime after eight hours in a day and double time after twelve. The threshold rules are covered in overtime pay basics, and a single span can be checked quickly with the hours between two times calculator.
Keep the underlying figures, not just the weekly total. Federal record-keeping requirements expect employers to retain daily and weekly hours worked, the basis of pay and total earnings for each non-exempt employee, and to hold the payroll records for at least three years. When a total is questioned months later, the day-by-day detail is what resolves it. A weekly total on its own proves very little.
How Do You Calculate Hours Worked on an Overnight Shift?
Split the shift at midnight and add the two pieces. Count the time from the punch-in to 00:00, then the time from 00:00 to the punch-out, and add them together. A 22:15 start with an 06:30 finish is 1 hour 45 minutes plus 6 hours 30 minutes, or 8.25 hours.
The second question is which day the shift belongs to. Most employers assign the whole shift to the day it began, which keeps the record simple, but the choice must be consistent because it decides which workweek the hours worked fall into and therefore when overtime is triggered. Write the convention into the timesheet policy rather than leaving it to whoever is totalling the cards that month.
Conclusion
To calculate hours worked accurately, convert both punches to a 24-hour clock, subtract in hours and minutes, turn the remainder into decimal hours, take out unpaid meal periods, and sum the days across a fixed workweek. Handle overnight shifts by splitting them at midnight, and keep the rounding policy neutral. None of it is difficult, but all of it has to be done the same way every week. Enter your punches in the time card calculator to see the totals worked out for you, or browse the other free tools on timeclock.now.