Pay Period Types Explained: Weekly, Bi-weekly, Semi-monthly, Monthly

How many paychecks each schedule produces, how to convert between them, and why overtime ignores the pay period.

Updated 2026-10-20

The pay period is how often you are paid. It changes the size of each check and nothing else about what you earn.

Converting an amount between periods

Annual = amount × checks per year. Then divide by the target. $2,000 bi-weekly is $52,000 a year, which is $2,166.67 semi-monthly or $4,333.33 monthly. Converting bi-weekly to semi-monthly by “adding a bit” is a common error: the semi-monthly check is 8.33% larger because there are two fewer of them.

Bi-weekly versus semi-monthly

Bi-weekly checks land on the same weekday and cover exactly 14 days, so timesheets line up with work weeks. Two months a year have three paydays. Semi-monthly checks fall on fixed dates, so each covers 13 to 16 days and overtime weeks straddle the boundary. Salaried staff are often semi-monthly; hourly staff are often bi-weekly for this reason.

Overtime does not care about pay periods

Overtime is owed per fixed 7-day work week. A semi-monthly period that starts on a Wednesday includes part of a week whose other days were paid last period. To compute overtime correctly you need the hours already worked in that straddling week, which is why our Timesheet Calculator has a “hours already worked this week” field for the first week of a period.

Weekend and holiday paydays

When a payday falls on a weekend or bank holiday most employers pay on the preceding business day. The Pay Period Calendar generates every payday in a year from one known date and shifts weekend dates earlier.

Hourly to pay period

Hourly rate × hours per week × 52 ÷ checks per year. $20 × 40 × 52 = $41,600; bi-weekly $1,600; semi-monthly $1,733.33.

Which is better for employees

Weekly and bi-weekly give faster access to earnings and align with hourly timekeeping. Semi-monthly and monthly simplify budgeting against monthly bills. State laws set minimum frequencies: several states require at least semi-monthly pay for hourly workers, and some (for example Arizona, Connecticut, Massachusetts for some workers) require weekly or bi-weekly.

Calendar quirks

Bi-weekly schedules produce 27 paydays in some years rather than 26. Because 52 weeks is 364 days, the extra day each year (two in a leap year) accumulates and every 11 years or so a 27th payday lands. Employers either divide the annual salary by 27 that year, pay the 27th check as normal and absorb the cost, or shift the schedule. Weekly schedules have the same issue with 53 paydays.

Semi-monthly schedules sometimes use the 1st and 15th rather than the 15th and last day, and some pay on the 10th and 25th to allow time for timesheet processing. Monthly schedules commonly pay on the last business day or the 25th.

Lag versus current pay

Many employers pay in arrears: a bi-weekly check on Friday covers the two weeks ending the previous Saturday, giving payroll a week to process hours. Salaried employees are often paid current, through the payday itself. A new hire on a one-week lag waits up to three weeks for the first check.

Which schedule costs the employer more

Each payroll run has a fixed processing cost, so weekly payroll costs roughly twice as much to run as bi-weekly and four times monthly. Hourly workforces nevertheless favour weekly or bi-weekly because it matches the work week and reduces errors in overtime.

Frequently asked

How many bi-weekly pay periods are in 2026? 26 for most start dates. Starting on Friday 2 January 2026 the paydays run 2 Jan, 16 Jan and so on, and the 26th is 18 December; the next falls on 1 January 2027.

Can my employer change my pay schedule? Generally yes with notice, subject to state minimum-frequency laws. Several states require written notice in advance.

Is monthly pay legal for hourly workers? Not in many states. For example California requires at least semi-monthly pay for most employees and sets deadlines after each period; Texas requires semi-monthly for non-exempt workers.

Why does my monthly budget not match 4 weekly checks? A month averages 4.33 weeks, so four weekly checks cover only 92% of a month. Budget on annual ÷ 12.