To calculate payroll hours and minutes manually, record each shift’s start and end times, subtract any unpaid meal breaks, convert the leftover minutes into decimals, total the decimal hours for the workweek, and multiply by the hourly rate — with anything over 40 hours paid at time-and-a-half. The arithmetic is grade-school subtraction and multiplication. The care goes into which minutes count, how you round, and where the workweek starts.
What You Need Before You Start
Every manual calculation begins with daily time records showing the exact clock-in and clock-out for each shift. Federal regulations require employers to track hours worked each workday and total hours worked each workweek for every non-exempt employee.1eCFR. 29 CFR 516.2 – Employees Subject to Minimum Wage or Minimum Wage and Overtime Provisions Those records should also note any unpaid meal periods, which typically run 30 minutes or longer. If you use paper time sheets, have employees record times in a consistent format — either 12-hour with AM/PM, or 24-hour — so you’re not guessing whether “4:00” means morning or afternoon.
Fix the Workweek First
Before you total anything, set a workweek. Under federal law, a workweek is a recurring period of 168 hours: seven consecutive 24-hour periods. It can start on any day and at any hour, but once you set it, it stays fixed. You cannot shift the start date around to avoid triggering overtime in a particular week.2eCFR. 29 CFR 778.105 – Determining the Workweek Overtime eligibility, total hours, and gross pay all reset at the start of each new 168-hour cycle.
Pick a Rounding Rule and Stick to It
Raw punch times like 8:07 AM or 5:12 PM are awkward to work with. Federal regulations allow rounding to the nearest five minutes, one-tenth of an hour (six minutes), or quarter hour (fifteen minutes), as long as the rounding averages out fairly and does not shortchange employees over time.3eCFR. 29 CFR 785.48 – Use of Time Clocks The most common approach is quarter-hour rounding: one to seven minutes round down, eight to fourteen minutes round up. An 8:07 AM clock-in becomes 8:00; an 8:08 AM clock-in becomes 8:15. Whatever rule you pick, document it and apply it the same way every pay period.
Which Minutes Count as Paid Time
Not every minute on the premises is automatically compensable, and not every minute off-site is automatically free. Short rest breaks of roughly 5 to 20 minutes count as paid work time and must be included in weekly totals. Meal periods of 30 minutes or longer are generally not compensable, as long as the employee is completely relieved of duties during that time.4U.S. Department of Labor. Breaks and Meal Periods If someone eats lunch at their desk while answering phones, that 30 minutes is work time regardless of what the schedule calls it.
Waiting time follows a similar logic. A receptionist sitting at the front desk between visitors is “engaged to wait” and gets paid. A technician who goes home and carries a pager in case a call comes in is generally “waiting to be engaged” and is not, depending on how restricted their freedom is during the wait.5U.S. Department of Labor. FLSA Hours Worked Advisor – Waiting Time Make sure your time records reflect these situations rather than lumping all on-site time together.
Subtracting to Get Daily Net Hours
Once you know what counts, the daily calculation is simple: end time minus start time, then subtract any unpaid meal break.
An employee clocks in at 8:15 AM and clocks out at 4:45 PM. That is 8 hours and 30 minutes on-site. Subtract a 45-minute unpaid lunch and net compensable time is 7 hours and 45 minutes.
When the minutes column will not subtract cleanly, borrow from the hours column the way you did in grade school. For a 9:00 AM to 5:03 PM shift, you cannot subtract 0 minutes from 3, so borrow: think of 5:03 as 4:63. Then 4:63 minus 9:00 (treating the hours in 24-hour form) gives 8 hours and 3 minutes. Apply your rounding rule and that becomes 8 hours flat.
Shifts That Cross Midnight
Overnight shifts trip people up because the end time looks earlier than the start time. Convert everything to 24-hour format and add 24 to the end time. A 10:00 PM to 6:30 AM shift becomes 22:00 to 30:30. Subtract: 30:30 minus 22:00 is 8 hours and 30 minutes. Take out any unpaid break and you have your net hours.
Converting Minutes to Decimals
You cannot multiply hours-and-minutes by a dollar rate and get a correct answer. The minutes have to become a decimal first. Divide the minutes by 60. Fifteen minutes is 0.25, thirty is 0.50, forty-five is 0.75. That 7-hour-45-minute shift becomes 7.75 decimal hours.
The quarter-hour conversions you will use most:
- 15 minutes = 0.25
- 30 minutes = 0.50
- 45 minutes = 0.75
If you round to the nearest six minutes instead, the conversions are simpler still: 6 minutes = 0.10, 12 = 0.20, on up to 54 = 0.90. Whichever system you use, convert every shift before you start multiplying. Mixing clock-format and decimal-format numbers in the same worksheet is the fastest way to produce a paycheck that is noticeably off.
Totaling the Week and Applying Overtime
Add the decimal hours from each day to get the weekly total. Under federal law, any hours beyond 40 in a single workweek must be paid at one and one-half times the regular rate.6Office of the Law Revision Counsel. 29 USC 207 – Maximum Hours You cannot average hours across two weeks to avoid the threshold; each workweek stands alone.2eCFR. 29 CFR 778.105 – Determining the Workweek
Some states require daily overtime after 8 hours, so check your state rule. The federal 40-hour weekly threshold is a floor.
One boundary worth knowing: the “regular rate” used for the overtime multiplier is not always the base hourly wage. Shift differentials, nondiscretionary bonuses, and production incentives generally have to be folded in first. Discretionary bonuses and certain benefit-plan contributions can be excluded.7eCFR. 29 CFR Part 778 Subpart C – Payments That May Be Excluded From the Regular Rate If you pay only a single flat hourly wage, the regular rate and the base wage are the same.
Multiplying to Get Gross Pay
For a week with no overtime, multiply total decimal hours by the hourly rate. Five shifts of 7.75 hours total 38.75 hours. At $20.00 per hour, gross wages are 38.75 × $20.00 = $775.00.
For a week with overtime, split it. An employee earning $20.00 per hour works 44.5 hours. The first 40 hours pay at straight time: 40 × $20.00 = $800.00. The remaining 4.5 hours pay at time-and-a-half: 4.5 × $30.00 = $135.00. Gross for the week: $935.00.
Errors in the decimal conversion earlier compound here, so double-check the shift totals before you multiply. A single misplaced decimal — 8.5 instead of 7.5 on one day — adds $20.00 to the paycheck and keeps adding it every pay period until someone catches it. Accuracy matters beyond the paycheck itself: the Department of Labor can pursue back wages plus an equal amount in liquidated damages, and employees can sue for back pay, liquidated damages, attorney’s fees, and costs.8U.S. Department of Labor. Back Pay
From Gross to Net
Gross wages are what the employee earns. The paycheck itself lands after mandatory federal withholdings. Employers must deduct three federal taxes from each employee’s wages:9Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide
- Federal income tax, withheld based on the employee’s W-4 and the IRS withholding tables. The amount varies by filing status, dependents, and any additional withholding the employee requests.
- Social Security tax, 6.2% of wages up to $184,500 in 2026, with the employer paying a matching 6.2%.10Social Security Administration. Contribution and Benefit Base
- Medicare tax, 1.45% of all wages with no cap. An additional 0.9% applies to wages over $200,000 in a calendar year, and that extra piece is paid entirely by the employee.9Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide
On the $775.00 gross figure above, Social Security withholding is $775.00 × 0.062 = $48.05 and Medicare withholding is $775.00 × 0.0145 = $11.24. Federal income tax depends on the W-4, so pull the withholding tables in IRS Publication 15 for that line. State income tax, where it applies, comes on top.
Keep the Records
Finishing the calculation is not the last step. Federal regulations require employers to preserve payroll records — including hours worked each day, total weekly hours, and wages paid — for at least three years from the last date of entry.11eCFR. 29 CFR Part 516 – Records to Be Kept by Employers The statute of limitations for an FLSA wage claim is two years, or three for willful violations, so that retention window lines up with the exposure. If a dispute arises and you cannot produce the records, the burden shifts to you to prove the wages were correct.
Keep the original time sheets, the decimal conversion notes, and the final pay calculations together for each pay period, organized by workweek. Digital scans work as long as the originals were legible and complete when scanned.