How to use this calculator
- Enter the requested values for average weekly hours, average semi-monthly hours, annualized hours.
- Review each input for the correct unit, pay period, and policy assumption.
- Calculate the result and read the explanation shown with each output.
- Compare the estimate with your time records, agreement, payroll system, or employer policy before relying on it.
Input guide
Average weekly hours
Provide the average weekly hours used for this specific estimate. Use the same period and unit as the other inputs.
Average semi-monthly hours
Provide the average semi-monthly hours used for this specific estimate. Use the same period and unit as the other inputs.
Annualized hours
Provide the annualized hours used for this specific estimate. Use the same period and unit as the other inputs.
How this calculator works
Average semi-monthly hours = weekly hours × 52 ÷ 24.
Worked example
A 40-hour week averages 86.67 hours per semi-monthly period.
How to interpret the result
Use the displayed result as a planning figure, not as an official payroll determination. A materially unexpected result usually means the entered period, rate, threshold, break, accrual rule, or conversion basis should be checked.
Rounding policy
Time precision
Decimal outputs are rounded to two places unless a more precise FTE ratio is shown.
Assumptions and limitations
- This is an annual average; actual calendar workdays vary between periods.
Frequently asked questions
Is semi-monthly the same as biweekly?
No. Semi-monthly has 24 periods per year; biweekly usually has 26.
Will every period contain 86.67 hours?
Not necessarily. Calendar-based hourly totals vary by the days in each period.
When should I recalculate with the Semi-Monthly Hours Calculator?
Recalculate whenever the hours, rates, schedule, pay period, policy assumptions, or planned usage changes. Saving the exact inputs makes comparisons more reliable.
How accurate is the Semi-Monthly Hours Calculator?
The arithmetic follows the formula shown on the page. Real payroll or policy outcomes can still differ because of contracts, jurisdictional rules, employer systems, taxes, deductions, caps, and rounding practices.