Hours Between Two Times: Converting Shifts to Payroll Hours (2026)

Two Numbers, Two Different Jobs

Every shift produces two numbers. The first is elapsed time — the plain distance between the punch in and the punch out. The second is paid time, which is elapsed time after unpaid meal periods come out. Payroll pays the second number, and it pays it as a decimal.

That is where most timesheet disputes begin. Not in the law, and not in the rate, but in arithmetic done on the back of a schedule.

Step 1: Get Elapsed Time Right

Convert both clock times to minutes past midnight, then subtract. A 7:30 a.m. start is 450 minutes. A 4:15 p.m. finish is 975 minutes. The difference is 525 minutes, or 8 hours 45 minutes.

Doing it in your head with a.m. and p.m. is exactly how people lose fifteen minutes at a time. Minutes past midnight never lies to you.

Step 2: Handle the Overnight Wrap

A shift that starts at 22:00 and ends at 06:30 looks like a negative number if you subtract naively. Add a day: 1440 minus 1320, plus 390, gives 510 minutes — 8 hours 30 minutes.

The separate question is which workday those hours land in. Your employer defines a fixed, recurring seven-day workweek, and the overnight hours belong to whichever day the employer's policy assigns them to. That assignment cannot move around week to week to keep you under forty hours.

Step 3: Remove Only Genuine Unpaid Breaks

A bona fide meal period of thirty minutes or more, taken completely free of duty, is unpaid and comes out. Rest breaks of about twenty minutes or less are hours worked, stay in, and count toward the overtime threshold.

The distinction is relief from duty, not the label on the schedule. A "lunch" spent watching a register or waiting for a delivery is work time.

Step 4: Convert to Decimal Hours

This is the step that quietly costs money. Payroll multiplies rate by hours, and minutes cannot be multiplied, so 8 hours 15 minutes becomes 8.25.

| Minutes | Decimal | Minutes | Decimal |

| --- | --- | --- | --- |

| 5 | 0.08 | 35 | 0.58 |

| 10 | 0.17 | 40 | 0.67 |

| 15 | 0.25 | 45 | 0.75 |

| 20 | 0.33 | 50 | 0.83 |

| 25 | 0.42 | 55 | 0.92 |

| 30 | 0.50 | 60 | 1.00 |

Reading 8.25 as "eight hours and twenty-five minutes" understates the shift by ten minutes. Repeat that five days a week and you have given away roughly forty-three hours a year.

A Worked Week

A warehouse associate at $22.40 an hour clocks these spans, each with a thirty-minute unpaid lunch:

| Day | In | Out | Elapsed | Paid decimal |

| --- | --- | --- | --- | --- |

| Mon | 07:30 | 16:15 | 8h 45m | 8.25 |

| Tue | 07:30 | 17:00 | 9h 30m | 9.00 |

| Wed | 07:25 | 16:20 | 8h 55m | 8.42 |

| Thu | 22:00 | 06:30 | 8h 30m | 8.00 |

| Fri | 07:30 | 15:45 | 8h 15m | 7.75 |

The paid total is 41.42 hours. Forty hours are straight time at $896.00, and 1.42 hours carry the overtime premium at $33.60 for $47.71 — $943.71 gross for the week.

Round each day down to the half hour instead and the week reads 40.5 hours. The employee loses the premium on almost a full hour, and the employer has created a wage claim.

Rounding Is Allowed, Bias Is Not

Federal guidance permits rounding punches to the nearest quarter hour, but only when the practice is neutral over time — sometimes up, sometimes down, averaging out. A system that always rounds the start forward and the finish backward is not rounding, it is a pay cut, and it fails on audit.

Two practical tests. Does your stub ever show more time than you actually worked? If never, the rounding is one-directional. And does the system count the minutes you spend booting up, gowning, or clearing security before the official start? If those steps are integral to the job, they are compensable.

Do the Check Yourself

Rebuild one span at a time in the time duration calculator, then total the week in the time card calculator. If a lunch was skipped or interrupted, price it in the lunch break calculator before you raise it, and read how time rounding is allowed to work so the conversation stays factual.

Two habits protect you more than any tool: photograph or note your punches on the day, and check the decimal hours on your stub against your own total each period. Discrepancies found within a pay cycle are usually fixed as corrections. Discrepancies found a year later become claims.