Pay Frequency Converter

How many pay periods are in a year?

Weekly 52, biweekly 26, semimonthly 24, monthly 12, quarterly 4, annual 1. Those six counts are the whole tool. Every conversion pivots on the annual figure, and there is exactly one formula: multiply your current pay by the periods in your current frequency to get annual pay, then divide by the periods in the frequency you are converting to.

• Weekly, 52: paid every week on the same weekday. Some calendar years land 53 weekly paydays.
• Biweekly, 26: paid every 14 days. 26 x 14 = 364 days, one short of a year, which is where the drift comes from.
• Semimonthly, 24: paid twice per calendar month on fixed dates, often the 15th and the last day. 12 x 2 = 24. Never 26.
• Monthly, 12: once per calendar month.
• Quarterly, 4: once per calendar quarter. Common for owner draws.
• Annual, 1: once per year. Common for 1099 retainers.

Biweekly is the most common schedule in the US, covering 43.0% of private establishments, followed by weekly at 27.0% and semimonthly at 19.8% (Bureau of Labor Statistics, Current Employment Statistics, February 2023). Monthly is rare, and for good reason: most state payday laws require W-2 employees to be paid at least semimonthly or biweekly, and monthly pay is often restricted to exempt professionals.

Biweekly vs semimonthly: the conversion everyone gets wrong

Biweekly is day-driven: a check every 14 days, whenever those days fall. Semimonthly is date-driven: a check on two fixed dates each month, whenever those dates fall. That one difference is what produces 26 checks a year against 24, and almost every bad pay conversion starts by ignoring it.

Take a $52,000 salary. Biweekly, that is $2,000.00 a check. Semimonthly, it is $2,166.67 a check. Same money, same year, checks $166.67 apart. The ratio is fixed at 26 divided by 24, which is 1.0833, so a semimonthly check is 8.33% larger than a biweekly one at any salary you care to name. Biweekly also gives you two three-paycheck months a year, because 26 checks do not distribute evenly across 12 months. Semimonthly never does, because it cannot.

Then there is the trap. To convert a biweekly check to a monthly figure, people double it. A $2,000 biweekly check becomes $4,000 a month, which is wrong. The correct factor is 26 divided by 12, or 2.1667, giving $4,333.33 a month. Doubling understates annual pay by $4,000, and it happens constantly on rental applications and loan files. Never call semimonthly "bi-monthly" either: the word is used to mean both twice a month and every two months, so it communicates nothing.

When your deductions have to change too

Changing pay frequency re-cuts the whole stub, not just the gross line. The gross line is the easy half, and it is where most conversions stop.

A $220 monthly health premium is $2,640 a year. On a semimonthly schedule that is $110.00 per check across 24 periods. Move the same worker to biweekly and the same $2,640 becomes $101.54 per check across 26 periods. Keep charging $110.00 and you collect $2,860 over the year, a full extra month of premium. The same arithmetic applies to garnishments, flat-dollar 401(k) deferrals, union dues, and employer contributions on the other side of the stub.

Withholding moves too, but differently. Your tax rate does not change, and your annual liability does not change. What changes is the amount withheld per check, because the IRS withholding tables are indexed by pay frequency: the biweekly table and the semimonthly table hold different amounts for the same annual salary. Over a full year it evens out. Every figure on this page is gross pay, before any of that comes off.

The 27-paycheck year

A biweekly schedule covers 364 days over 26 periods, one day short of a calendar year and two short of a leap year. That drift accumulates, and eventually a calendar year contains 27 biweekly paydays instead of 26. It happens roughly every 11 years, depending on which weekday January 1 falls on and where the employer's first payday lands. Semimonthly and monthly schedules never drift, because they are pinned to calendar dates: always 24, always 12. If you needed one more reason not to treat biweekly and semimonthly as the same thing, this is it.

Employers pick one of two responses. Spread the salary: divide annual pay by 27 instead of 26, keeping annual pay identical and making every check about 3.7% smaller. Or pay a 27th check: keep the per-check amount the same and cut one more, raising annual payroll by 1/26, which is 3.85%. Spreading is the more common choice. It also carries two compliance footnotes worth checking: the reduced per-check amount must not push an exempt employee below the FLSA salary threshold, and benefit deductions built around 26 periods (401(k), FSA, HSA) can overshoot or undershoot their annual limits when a 27th period appears.

Putting the new schedule on a pay stub

Once the frequency changes, every stub for the rest of the year carries a new pay period, a new per-check gross, re-cut deduction lines, and YTD columns that have to stay continuous across the switch. The YTD earnings calculator is the tool for that second half of the year, because a mid-year frequency change is exactly the kind of thing that makes a running total stop matching what the employer printed.

Payslip44 builds the document itself. Employer, employee, and line-item templates are reusable, so re-cutting a deduction is a one-time edit rather than a change you make on every stub. It handles W-2, 1099, statutory, and owner classifications, offers six layouts, and does the money math to the cent, so a salary still ties back to itself across 26 checks (or 27). It all runs on-device, and stubs export to PDF, PNG, CSV, or plain text.

Changed the schedule? Download Payslip44 and put the new figures on a real stub.