A pay period is the stretch of time one paycheck covers. Employers pick one of four common schedules, and the choice quietly decides how many paychecks you get a year, how big each one is, and whether some months feel richer than others. Here's the whole landscape — what each schedule means, the biweekly-versus-semimonthly muddle, why some months hand you a third paycheck, and how to turn a yearly salary into a single payday.
Paychecks a year: weekly 52, biweekly 26, semimonthly 24, monthly 12.
Multiply the schedule out across a year and that's how many times you're paid. Divide your annual salary by that same number and you get one gross paycheck. The two that get mixed up — biweekly (every two weeks, 26) and semimonthly (twice a month, 24) — sound alike but aren't the same.
Here are the four side by side, with the paycheck size each would produce from a $52,000 gross annual salary (a round number that divides nicely, chosen only to make the maths clear — your own figure goes in the same way).
| Schedule | How often | Paychecks/yr | From $52,000/yr |
|---|---|---|---|
| Weekly | Once a week, same weekday | 52 | $1,000.00 |
| Biweekly | Every two weeks, same weekday | 26 | $2,000.00 |
| Semimonthly | Twice a month, fixed dates | 24 | $2,166.67 |
| Monthly | Once a month | 12 | $4,333.33 |
These are gross amounts — before tax, pension and other deductions. The yearly total is identical in every row; only the slice size and timing change.
You're paid once every week, almost always on the same weekday (Friday is the classic). It's the most frequent schedule, common for hourly and shift work, because each check arrives quickly after the hours are worked. The trade-off is more paydays for payroll to run and the smallest individual check. A weekly schedule occasionally produces a 53rd payday in years where the calendar lines up that way.
You're paid every two weeks, on the same weekday each time — for example, every other Friday. Two weeks is 14 days, and 26 of those cover the 364-day bulk of the year, so it's 26 paychecks. For a full-time job this is a tidy 80 hours of work per check (40 a week × 2). Biweekly is the single most common schedule in the United States, and it's the one with the famous three-paycheck months — see below.
You're paid twice a month on fixed dates — commonly the 15th and the last day, or the 1st and the 16th. That's always exactly 2 per month, so 24 a year. Because the dates are pinned to the calendar rather than to a weekday, paydays drift across the week and a pay period can be 13, 14, 15 or 16 days long. It lines up neatly with monthly bills like rent, which is why salaried office roles often use it.
One paycheck a month, usually on a fixed date or the last working day. It means the largest individual check and the simplest budgeting against monthly bills, but the longest wait between paydays — so it asks for the most discipline in stretching one check across the whole month. It's common for salaried staff in the UK, much of Europe, and for many salaried roles worldwide.
They sound interchangeable and they're not. The clean way to keep them apart:
Same annual pay, but a biweekly check is a touch smaller (you're splitting the year into 26 slices instead of 24) — and because there are two extra biweekly paydays, two months a year carry a third one.
On biweekly pay you get 26 checks across 12 months. That doesn't divide evenly: 26 ÷ 12 = 2.17. So ten months hold two paydays and two months hold three. Those are the three-paycheck months — a genuinely useful thing to know, because the extra check isn't really extra money (your yearly total is fixed), but it does arrive as a lump you can earmark for savings, a debt payment, or a sinking fund instead of routine bills.
Which months they fall in depends entirely on when your first payday of the year lands; once you know that date, count forward in 14-day steps and the two crowded months reveal themselves. Semimonthly pay never does this — it's two checks every month, no exceptions.
The core move is one division — annual salary by the number of pay periods:
So a $60,000 salary is $1,153.85 weekly, $2,307.69 biweekly, $2,500.00 semimonthly, or $5,000.00 monthly — all gross. Going the other way, multiply one paycheck by the period count to recover the annual figure: a $2,500 semimonthly check is $2,500 × 24 = $60,000 a year. Remember these are pre-deduction; tax, insurance and pension come off before the money lands.
If you're paid by the hour, a paycheck is simply hours worked in the period × hourly rate (plus any overtime). For full-time hours the period totals are easy to remember: 40 hours in a weekly check, 80 in a biweekly one. So $20 an hour, full time, is $20 × 80 = $1,600 gross per biweekly paycheck. Semimonthly is a little fuzzier for hourly pay, since the number of working days in each half-month varies — to count the exact working days in any stretch, use the business-days calculator.
Here's the quirk that surprises payroll teams. A biweekly schedule is 26 paydays of 14 days = 364 days, but a year is 365 (366 in a leap year). That leftover day or two slowly drifts, and roughly once every 11 years it pushes a 27th payday into the calendar year. Weekly schedules hit the same wall with a 53rd week. It doesn't change your annual rate, but it does mean an extra pay run that year — and employers handle it in different ways, so it's worth a question if your payslips suddenly don't match a tidy ÷26.
There's no universally right answer — it's a trade between cash-flow rhythm and admin:
Semimonthly is often the salaried-office sweet spot because pay dates match rent and subscription dates; biweekly wins where people want a predictable weekday payday and don't mind the date drifting. The total in your pocket over a year is the same whichever box gets ticked.
Once you know your schedule, the rest is calendar arithmetic — and that's exactly what the week.hako.to tools are for. Count the working days in a pay period with the business-days calculator, find a payday two weeks out by adding days to a date, see how a date sits inside the year with the quarters reference, or check the days until your next one. All of it runs in your browser — nothing about your pay is sent anywhere.
← Back to the week toolsAll figures here are gross (pre-deduction) and the examples use round salaries to keep the maths readable; your own pay, tax and benefits will differ. This is fixed reference text — nothing you read or type on the week tools is sent anywhere.