Prorated Salary Calculator
Work out the pay for a partial month when you start, leave or take unpaid days: daily rate and prorated salary by calendar days, working days (Mon–Fri) or a fixed 30-day month, compared side by side.
How it works
daily rate = monthly salary ÷ days in the basis (calendar days in the month, working days in the month, or 30) · prorated salary = daily rate × days paid in that basis
When someone joins or leaves mid-month, or takes unpaid days, payroll pays only the part of the month they were employed. There are three common conventions: calendar days (the daily rate changes with the month length, so a February day is worth more than a July day), working days (only Monday–Friday count, which is fairer when weekends are not worked) and a fixed 30-day month (every month is treated as 30 days, popular in many payroll systems). The methods can differ by a noticeable amount, so check which one your contract or payroll policy uses.
Worked example
A $4,000 monthly salary, starting on October 13, 2026 and paid to October 31. October has 31 days, so by calendar days the daily rate is $4,000 ÷ 31 = $129.03 and 19 days are paid: $2,451.61. By working days, 14 of October's 22 weekdays are paid ($2,545.45); with a fixed 30-day month, 18 of 30 days are paid ($2,400.00).
Frequently asked questions
How do you calculate a prorated salary?
Divide the monthly salary by the number of days in the basis your employer uses (calendar days, working days or 30), then multiply by the days you were employed in that month. $4,000 for 19 of 31 calendar days is $2,451.61.
Which proration method is most common?
It depends on the employer and the country. Calendar days and working days are both widespread; a fixed 30-day month is common in payroll software and in many Latin American and Middle Eastern contracts. Your contract or payroll policy should say which one applies.
Are weekends paid when I start mid-month?
With the calendar-day method, yes — every day from your start date counts. With the working-day method only weekdays count, but the daily rate is higher because the salary is spread over fewer days.
Can I use this for unpaid leave?
Yes. Enter the days you were paid (the month minus the unpaid days) and the calculator shows the remaining pay; the "not paid this month" line is the deduction.
Related calculators
Estimates for planning only. Your employment contract, collective agreement and local labor law decide what you are actually owed; check with your employer, payroll team or a qualified adviser before relying on a figure.