Faster Employee Payments: How to Calculate Hours Worked

Employees in the United States work more than 2,000 hours a year, and most of the payroll errors that come out of that start with something small: a punch time recorded as 7:15 instead of 7.25 hours, or a break that never got subtracted. Here’s the actual math, followed by how to stop doing it by hand.

How to calculate hours worked

Start with the clock-in and clock-out times for the day. If someone worked 7:00 AM to 3:30 PM with a 30-minute unpaid lunch, that’s 8.5 hours on the clock minus 0.5 hours for lunch, or 8 hours worked.

The part that trips people up is converting minutes into decimal hours, since payroll runs on decimals, not a 60-minute clock. Fifteen minutes is .25 of an hour, thirty minutes is .5, and forty-five minutes is .75. A shift that ends at 3:47 rounds to 3.75 or 4.0 depending on your rounding policy, not 3.47. Our free decimal hours converter handles that conversion if you’re doing it by hand.

From there, multiply total hours by the hourly rate, and add time and a half for anything over 40 hours in a workweek. It’s straightforward for one employee on one day. It gets error-prone fast once you’re doing it for a dozen people, five days a week, with different start times and different breaks.

Where the manual version breaks down

A minute miscounted here, a break that didn’t get subtracted there. It doesn’t take much to throw a timesheet off, and at the volume most businesses run at, it’s hard to catch by hand.

TimeTrakGO removes the conversion step by recording punches automatically. Employees clock in through a mobile app, a kiosk, or facial recognition instead of writing anything down. The software handles the conversion itself, calculating decimal hours and overtime as the punches come in. A real-time dashboard shows the running totals, so you can catch a missed punch before payroll runs instead of after.

PTO and payroll, handled the same way

Time off works the same way. TimeTrakGO tracks PTO balances in real time, and once a request is approved, hours worked update on their own, no spreadsheet required. Hours then sync directly with ADP, Paychex, QuickBooks, Gusto, Heartland, and Sage 50.

If you’re still doing the decimal conversion by hand, our free timesheet calculator is a faster stopgap. For the automated version, start a free trial and see what it looks like without the manual math.