Prorate Salary Calculator

Someone joins on the 10th: what do you pay them for the rest of the month? Enter the salary, the month and year, the first day worked, and your method (working days or calendar days) and this calculator returns the prorated pay, the daily rate, and the exact share of the month worked. It counts real weekdays from the calendar, so February and 31-day months come out right. For ongoing part-time schedules rather than partial months, see our part-time income calculator; salary-as-a-share math lives in the percentage salary calculator; pay-frequency conversions are in the annual to bi-weekly salary calculator; and the effect of a pay cut is covered by our reduced salary calculator.

Quick Answer

The worked example, checked against this exact tool

Short answer: $72,000 salary, start Nov 10 2026: $4,285.71 by working days.

Monthly: $72,000 / 12 = $6,000. November 2026 has 30 days and 21 weekdays. Starting the 10th, the employee works 15 weekdays (10th-13th, 16th-20th, 23rd-27th, 30th). Daily rate: $6,000 / 21 = $285.71. Prorated: $285.71 x 15 = $4,285.71 (71.4% of the month). By calendar days: $6,000 / 30 x 21 = $4,200.00. Enter the defaults and the tool reproduces both.

Calendar days vs working days

Short answer: working days pays more per day worked; calendar days is simpler.

The working-day method divides by weekdays only, so each worked day is worth more: $285.71 vs $200.00 in the example. The calendar-day method divides by every day in the month, which effectively pays people for weekends. Neither is required by federal law; what matters is that the employer documents its method and applies it the same way to every starter and leaver. Offer letters that name the method prevent the most common payroll dispute of all: two employees comparing first paychecks computed differently.

Which method should you pick? If your payroll system already runs on weekdays, the working-day method matches how leave and attendance are tracked. If your contracts state pay in monthly terms with no weekday convention, the calendar-day method is easier to explain on a payslip. Either way, write the choice into the offer letter and the payroll policy, and never switch methods mid-year for one employee to reach a preferred number.

The three steps, every time

Short answer: monthly salary, daily rate, multiply by days worked.

Edge cases ride along for free: holidays the employee would have worked count as working days under most policies, unpaid leave days are simply not worked, and overtime for hourly staff is computed on actual hours, not prorated. One caution: the tool counts Monday to Friday as working days. If your business works Saturdays, or closes on a weekday holiday the employee would otherwise have worked, align the count with your written policy rather than treating the tool output as the policy itself.

A second check: February and a leaver

Short answer: February shrinks both denominators, and a leaver is the mirror image of a starter.

Take the same $72,000 salary ($6,000 a month) with a February 2026 start on the 16th. February 2026 has 28 days and 20 weekdays, and the 16th to the 28th holds 10 weekdays and 13 calendar days. By working days: $6,000 / 20 x 10 = $3,000.00. By calendar days: $6,000 / 28 x 13 = $2,785.71. The gap between methods is $214.29 here, much larger than November’s $85.71, because February’s short month concentrates the difference. This is exactly why a fixed 30-day denominator misleads: it would give $6,000 / 30 x 13 = $2,600.00 for the calendar case, understating the true calendar share.

The table below summarises both worked examples so you can check them at a glance.

For a leaver, read the tool in reverse. The calculator counts from a start day to month-end, so it directly answers the starter question. For someone who works from the 1st through a last day, compute the complement: run the tool from the day after the last day worked to month-end, then subtract that figure from the full monthly salary. Example: a leaver whose last day is November 13 on $6,000 a month, working days. The tool from November 16 gives the unworked remainder; monthly salary minus that remainder is the leaver’s pay. The principle is the same three steps, just applied to the days not worked.

What competing calculators miss

Proration tools hard-code 30-day months or ask you to count working days by hand, which is where the errors creep in. None explain that the two methods differ by real money ($85.71 on one paycheck here, $214.29 in the February example), and none flag the consistency requirement that actually creates payroll disputes. This page counts real calendar weekdays for any month and year, shows both methods side by side, and states the legal position plainly.

Concretely: the Savvy Calculator partial-month tool asks you to enter the number of days worked and total working days yourself, so a miscounted month flows straight into the paycheck. The SaveMoneyCalculator incomplete-month tool lists calendar, working-day and fixed 30-day methods but still leaves the day counting to you. Guide pages from BrioHR and Leave Balance explain the formulas well but offer no interactive tool that counts real weekdays for a chosen month and year. The winning moves here are the calendar-aware count, both methods from the same inputs, and the worked leaver complement above.

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