A reproducible partial-pay estimate begins with the full pay period, the paid range and the payroll convention. Those are separate choices: entering monthly salary does not make a biweekly period monthly. This calculator shows which dates count, why the three conventions can differ and how the final cents are allocated. Use those details to review the applicable payroll assumptions before relying on an estimate.
Choose a convention and keep its denominator visible
Start with the full pay-period dates, verified against the payroll schedule, and a separate paid date range inside them. Both endpoints count. The full-period base is annual salary divided by the entered pay periods per year. Calendar proration allocates that base over all calendar days in the full period. Actual-workday proration allocates it over the selected scheduled weekdays in that same period. The fixed annual basis instead divides annual salary by the entered annual workday denominator, which defaults to 260.
These conventions answer different questions. In a full calendar month, calendar and actual-workday proration return the same full-period base when every relevant day is included. The fixed annual basis can produce another amount because the month's scheduled-day count need not equal one twelfth of the annual assumption. Keep the selected convention, denominator and pay frequency with the result. A larger comparison value does not establish that one policy applies to the employee.
Inspect work schedules, unpaid dates and rounding
The scheduled workweek is an explicit set of weekdays. Monday through Friday is the default, but a different schedule can be entered without treating Saturday or Sunday as inherently unpaid. Under the calendar method, scheduled and nonscheduled dates both count inside the paid range. Under the other methods, only scheduled dates count. An explicit unpaid date removes that date from allocation. A holiday is not excluded unless you enter it as unpaid.
Select a calendar cell to inspect its treatment, or use the daily ledger as a list alternative. Arrow keys move between dates; the separate unpaid control changes financial inclusion. Final gross pay uses the full-precision rate and is rounded once, half up, to cents. The daily ledger then shares those final cents chronologically, so it adds exactly to the headline. A rounded displayed daily rate is explanatory and may not multiply back to the same result. CSV retains the raw values, inclusion flags and final allocated cents.
Use the estimate in a documented payroll review
The result models entered assumptions. It does not determine legal entitlement, interpret an employment agreement or calculate taxes, deductions or overtime. Confirm the applicable convention and schedule with the employer or a qualified payroll adviser. One constant salary is modeled across the period; separate salary changes require separate calculations. Invalid dates, reversed ranges and dates outside the full period remain errors instead of being silently moved to another day.
A biweekly example illustrates the distinction between salary entry and frequency: annual salary of $52,000 with 26 periods gives a $2,000 full-period base. In a 14-day period with 10 scheduled days, a paid range containing 7 calendar days and 5 scheduled days gives $1,000 under both period-based methods. A fixed annual basis of 260 also gives $1,000 in this particular example, but that agreement is not guaranteed for other ranges. Keep a CSV or Print report with the entered assumptions. Remember is optional, and public links contain financial values only after explicit review.