How to Calculate Biweekly Payroll Hours — Step-by-Step with Worked Examples
Biweekly pay is the most common pay frequency in the US — about 43% of private sector workers receive pay every two weeks. But calculating it correctly, especially with overtime, confuses even experienced managers. The key rule everyone gets wrong: overtime is calculated per workweek, not per pay period. Here's exactly how to do it right, with numbers.
Biweekly vs Semi-Monthly — Know the Difference
Biweekly (every 2 weeks)
26 pay periods per year. Same day of week each period (e.g., every other Friday). Each period = exactly 14 days / 2 workweeks. This guide covers biweekly.
Semi-monthly (twice per month)
24 pay periods per year. Fixed dates each month (e.g., 1st and 15th). Period length varies (15–16 days). More complex for hourly workers.
This distinction matters for overtime: biweekly periods always contain exactly two full workweeks, making overtime straightforward. Semi-monthly periods can split a workweek across two pay periods, which creates complications.
The Fundamental Rule: Overtime Is Per Workweek
Under the FLSA, overtime eligibility is determined per workweek, not per pay period. You cannot pool two weeks' hours together and apply a single 80-hour threshold. Each week stands alone with its own 40-hour limit.
Common mistake: An employee works 50 hours in week 1 and 30 hours in week 2 (80 hours total). The employer pays straight time for all 80 hours, reasoning the average is 40h/week. This is a wage theft violation — 10 hours of overtime must be paid from week 1, regardless of week 2's hours.
How to Calculate Biweekly Payroll Hours — The Method
- Collect clock-in/clock-out times for all 14 days.
- Subtract break time from each day's total.
- Sum the hours for Week 1 (days 1–7) separately from Week 2 (days 8–14).
- Apply the overtime threshold (40h) to each week independently.
- Calculate gross pay for each week: (regular hours × rate) + (OT hours × rate × 1.5).
- Add the two weekly gross pay figures for the biweekly paycheck total.
Worked Example — Biweekly with Overtime in Both Weeks
Employee: Maria · Hourly rate: $18.00 · OT rule: US Federal (40h/week)
| Day | Date | In | Out | Break | Hours |
|---|---|---|---|---|---|
| Mon | Apr 14 | 08:00 | 17:30 | 30 min | 9.00 |
| Tue | Apr 15 | 08:00 | 17:30 | 30 min | 9.00 |
| Wed | Apr 16 | 08:00 | 17:30 | 30 min | 9.00 |
| Thu | Apr 17 | 08:00 | 17:30 | 30 min | 9.00 |
| Fri | Apr 18 | 08:00 | 17:30 | 30 min | 9.00 |
| Sat | Apr 19 | — | — | — | 0.00 |
| Sun | Apr 20 | — | — | — | 0.00 |
| Week 1 Total | 45.00 h | ||||
| Mon | Apr 21 | 08:00 | 16:30 | 30 min | 8.00 |
| Tue | Apr 22 | 08:00 | 16:30 | 30 min | 8.00 |
| Wed | Apr 23 | 08:00 | 16:30 | 30 min | 8.00 |
| Thu | Apr 24 | 08:00 | 16:30 | 30 min | 8.00 |
| Fri | Apr 25 | 08:00 | 16:30 | 30 min | 8.00 |
| Sat | Apr 26 | — | — | — | 0.00 |
| Sun | Apr 27 | — | — | — | 0.00 |
| Week 2 Total | 40.00 h | ||||
| Biweekly Total | 85.00 h | ||||
Week 1 calculation (45h at $18/h)
Regular: 40h × $18 = $720.00
Overtime: 5h × $18 × 1.5 = $135.00
Week 1 gross: $855.00
Week 2 calculation (40h at $18/h)
Regular: 40h × $18 = $720.00
Overtime: 0h × $0 = $0.00
Week 2 gross: $720.00
Biweekly paycheck: $855.00 + $720.00 = $1,575.00 gross
Note: if the employer incorrectly averaged (85h ÷ 2 = 42.5h each week), they'd calculate $1,215 + $307.50 = wrong. Correct calculation owed $1,575 — the right answer here happens to match, but the method matters when one week has much more OT than the other.
What if Hours Are Very Uneven Between Weeks?
The per-workweek rule matters most when hours are uneven. Suppose week 1 = 55 hours, week 2 = 25 hours (80h total). An employer averaging (40h each) would owe: 80 × $18 = $1,440. The correct calculation: Week 1 has 15h OT ($810 + $405 = $1,215); Week 2 has 0h OT ($450). Correct total: $1,665 — $225 more than the averaged calculation. That $225 underpayment per period is a wage violation.
Tips for Accurate Biweekly Payroll
- Define your workweek start day in writing. The FLSA requires a fixed workweek. Document it (e.g., "Monday 12:01am through Sunday midnight") and apply it consistently.
- Track breaks separately. If employees take 30-minute unpaid lunch breaks, deduct them from each day's hours before summing. A 9-hour shift with a 30-minute unpaid break = 8.5 hours worked.
- Round consistently and neutrally. If you round clock-in/out times (e.g., to the nearest 15 minutes), the rounding must average out neutrally — you cannot systematically round in your favor.
- Process week 2 before it ends. Don't wait until payday to tally hours. Know each week's total before the week closes so you're not surprised by overtime on payday.
Biweekly vs Weekly Pay — Which is Better for Overtime Management?
Weekly payroll makes overtime tracking simpler — each pay period is one workweek, so the calculation is straightforward. Biweekly payroll is more administratively efficient (half the payroll runs per year) and costs less in processing fees. The overtime math is the same; biweekly just means two weeks per calculation cycle.
Our free calculator has a Biweekly mode — enter 14 days of clock-in/out times and get a full gross pay breakdown with per-week overtime applied correctly.
Try the Biweekly Payroll Calculator →Frequently Asked Questions
Is "biweekly" every two weeks or twice a week?
"Biweekly" officially means every two weeks (26 pay periods/year). "Twice a week" is called "semi-weekly." In practice, "biweekly" is almost universally used to mean every two weeks in the payroll context.
Does overtime apply across the two-week biweekly period?
No. Under federal law, overtime is always calculated per workweek (7-day period). You cannot treat a biweekly period as a single unit for overtime purposes. Each of the two weeks must be evaluated independently.
How many hours is a standard biweekly paycheck?
A full-time employee working 40 hours/week accumulates 80 hours in a biweekly period (40 × 2). If hours vary, the per-week totals may differ, but the calculation principle stays the same: evaluate each week at 40 hours and apply overtime to the excess.