Prorated Salary Calculator
Find the exact pay for any partial period — whether you started mid-month, left early, or worked a non-standard schedule.
💰 What is a Prorated Salary?
A prorated salary is the proportional portion of a full pay-period salary that an employee earns when they work only part of that period. Rather than paying the full monthly or biweekly amount, employers adjust compensation to reflect only the time actually worked. The word "prorate" comes from the Latin pro rata, meaning "in proportion."
Proration applies in many everyday HR situations: a new employee who joins mid-month, an employee who resigns partway through a pay period, someone returning from unpaid leave, or a worker switching from full-time to part-time mid-period. In all these cases, neither paying the full amount nor paying nothing is fair — the prorated calculation finds the exact proportional amount.
There are two standard methods used worldwide. The working days method — the most common in the US and UK — computes a daily rate by dividing the annual salary by 260 (52 weeks × 5 working days), then multiplies by actual working days. This is payroll-accurate because it treats all working days equally regardless of whether the month has 28 or 31 calendar days. The calendar days method — more common in continental Europe and for monthly-paid staff — divides the monthly salary by the number of calendar days in the month, then multiplies by calendar days worked. The two methods can produce materially different results.
Beyond the base paycheck, proration can cascade into 401k contribution limits, employer match calculations, annual bonus eligibility, PTO accruals, and even benefits start dates. Understanding the exact proration method your employer uses — and how to verify it independently — protects you from common payroll errors that often go unnoticed. This calculator implements both methods so you can cross-check your payslip and plan for any partial-period scenario.
📐 Formula
Working Days: Prorated Pay = Annual Salary ÷ 260 × Days Worked
260 = standard US/UK working days per year (52 weeks × 5 days)
Days Worked = actual working days in the pay period the employee was present
Daily Rate = Annual Salary ÷ 260
Example: $72,000 annual salary, 15 of 22 working days → $72,000 ÷ 260 = $276.92/day × 15 = $4,153.85
Calendar Days: Prorated Pay = Monthly Salary × (Days Worked ÷ Days in Month)
Monthly Salary = gross pay for a full calendar month
Days in Month = actual calendar days (28, 29, 30, or 31)
Days Worked = calendar days worked in the month (including weekends if counted)
Example: $5,000 monthly salary, 20 of 30 calendar days → $5,000 × (20/30) = $3,333.33
📖 How to Use This Calculator
Steps
1
Choose a method — Select 'Working Days' if your employer uses business days (the most common US/UK approach), or 'Calendar Days' if your payroll divides monthly salary by calendar days in the month.
2
Enter your salary — Working Days mode: enter your annual gross salary. Calendar Days mode: enter your gross monthly salary. Use your contract or most recent pay stub for the accurate figure before taxes.
3
Set the period details — Working Days: click a frequency preset (Monthly / Biweekly / Weekly) to auto-fill typical working days, then adjust if needed. Enter how many days you actually worked. Calendar Days: enter total days in the month and days you were present.
4
Click Calculate — See your prorated pay alongside the full-period equivalent, your daily rate, the amount deducted for the missing days, and the percentage of the full pay you'll receive. Verify this matches your payslip.
💡 Example Calculations
Example 1 — New Hire Starts Mid-Month (Working Days Method)
$78,000 annual salary — starts on the 10th — 14 of 22 working days in the month
1
Daily rate: $78,000 ÷ 260 = $300.00/day. The month has 22 working days; the new hire works the last 14 of them.
2
Prorated pay: $300.00 × 14 = $4,200.00. Full monthly equivalent: $300.00 × 22 = $6,600.00 (or $78,000 ÷ 12 = $6,500.00 — note the slight difference because 260 days ≠ 12 × 22 exactly).
3
The employee receives 63.6% of the full period pay ($4,200 ÷ $6,600). The deduction for the 8 missed days is $300 × 8 = $2,400.
Prorated Pay: $4,200.00 — Daily Rate: $300.00 — 63.6% of full pay
Try this example →Example 2 — Employee Resigns (Calendar Days Method)
$5,400 monthly salary — last day is the 20th — 20 of 31 calendar days in the month
1
Daily rate: $5,400 ÷ 31 = $174.19/day. The employee worked the first 20 calendar days of a 31-day month.
2
Prorated pay: $5,400 × (20 ÷ 31) = $5,400 × 0.6452 = $3,483.87. Amount deducted: $5,400 − $3,483.87 = $1,916.13.
3
The employee receives 64.5% of the full monthly salary. This final paycheck amount should appear on the last payslip.
Prorated Pay: $3,483.87 — Daily Rate: $174.19 — 64.5% of full month
Try this example →Example 3 — Biweekly Payroll, Partial Period
$95,000 annual salary — worked 7 of 10 working days in a biweekly period
1
Daily rate: $95,000 ÷ 260 = $365.38/day. Standard biweekly period has 10 working days; the employee missed 3 days of unpaid leave.
2
Prorated pay: $365.38 × 7 = $2,557.69. Full biweekly pay: $365.38 × 10 = $3,653.85 (or $95,000 ÷ 26 = $3,653.85). The two figures align because 260 = 26 × 10.
3
Deduction for 3 missed days: $365.38 × 3 = $1,096.15. Employee receives 70% of the full biweekly pay.
Prorated Pay: $2,557.69 — Full Period: $3,653.85 — Deducted: $1,096.15
Try this example →❓ Frequently Asked Questions
How is prorated salary calculated?
The most common method: Daily Rate = Annual Salary ÷ 260 (52 weeks × 5 working days). Prorated Pay = Daily Rate × Days Worked. For a $72,000 annual salary working 15 of 22 days in a month: daily rate = $72,000 ÷ 260 = $276.92; prorated pay = $276.92 × 15 = $4,153.85. The calendar days method divides monthly salary by days in the month instead: $6,000 ÷ 31 × 15 = $2,903.23.
What is a prorated salary?
A prorated salary is a partial payment reflecting only the portion of a pay period you actually worked. It applies when an employee starts or leaves mid-period, takes unpaid leave, or switches schedules. For example, if your monthly salary is $5,000 and you worked 10 of 22 working days, your prorated pay is $5,000 × (10/22) = $2,272.73 using the working days ratio.
What is the difference between working days and calendar days proration?
Working days proration counts only weekdays (Mon–Fri), using 260 working days per year as the denominator. Calendar days proration counts all days, using the actual days in the month (28–31). Working days is standard in the US and UK. Calendar days is common in Europe. The two methods produce different results — especially in February vs. months with 31 days.
How many working days are in a pay period?
A standard monthly period has approximately 22 working days. A biweekly period has 10 working days. A weekly period has 5 working days. The national payroll standard is 260 total working days per year (52 × 5). Months with holidays or an extra Monday may have one more or fewer working day than the typical count.
How do I calculate prorated salary for a new hire who starts mid-month?
Count working days from the start date through the end of the pay period. Daily rate = Annual ÷ 260. Prorated pay = daily rate × days worked. Example: starts on a Wednesday with 12 remaining working days (including start day), annual salary $65,000 → $65,000 ÷ 260 = $250/day × 12 = $3,000 for that month.
How do I calculate prorated salary for an employee who leaves mid-month?
Count working days from the first of the period through and including the last day worked. Daily rate = Annual ÷ 260. Prorated pay = daily rate × days worked. If the last day is the 10th with 8 working days in that month: $80,000 ÷ 260 × 8 = $2,461.54. Also check whether PTO payout is prorated by the same formula.
Does proration affect bonuses and benefits?
Yes, often. Performance bonuses tied to annual salary are commonly prorated for partial-year employees. Employer 401k matches follow the prorated salary base. PTO accruals are typically prorated to the fraction of the period worked. Health insurance premiums prorate to the month, not the day. Always check your employment contract or HR policy for the applicable rules.
What is the 260-day denominator and where does it come from?
260 = 52 weeks × 5 working days per week. It is the standard US and UK denominator for converting an annual salary to a daily rate. It assumes the employee works 5 days every week for 52 weeks with no unpaid leave. Some organizations use 261 or 262 for years with an extra working day, but 260 is the near-universal payroll standard.
Can prorated salary be calculated differently by different employers?
Yes. Employers may use: (1) Annual ÷ 260 × days worked; (2) Monthly ÷ calendar days in month × days worked; (3) Annual ÷ 52 × weeks worked; or (4) Annual ÷ 12 × (days worked ÷ total days in month). Always confirm with payroll which method applies — especially for first and final paychecks, where the difference can be hundreds of dollars.
How do I prorate salary for a mid-year salary change?
Calculate pay at each rate separately for the days each applies. Example: $60,000 from January through June (130 working days at $230.77/day = $30,000), raise to $70,000 from July through December (130 working days at $269.23/day = $35,000). Total year compensation = $65,000. Each individual paycheck should use the rate in effect for that specific pay period.
How does prorated pay work for hourly employees?
Hourly employees are already paid per hour — so there is no separate proration. They simply receive hours worked × hourly rate. Prorated salary applies only to salaried employees who receive a fixed period pay regardless of exact hours. If a salaried worker works fewer days, prorated salary computes the equivalent proportional fraction.
What is the prorated salary for $50,000 working 3 of 4 weeks in a month?
$50,000 ÷ 260 = $192.31/day. Three weeks = 15 working days. Prorated pay = $192.31 × 15 = $2,884.62. Full monthly equivalent = $192.31 × 22 = $4,230.77. The deduction for 7 missed working days = $192.31 × 7 = $1,346.15.