Pay Period Proration Calculator
Enter the full pay-period amount, the payable days or hours in a full period, and the days or hours to pay, to see the proration percentage and prorated pay.
Pay Period Proration Calculator calculates in your browser.
Prorate pay for part of a pay period
Starting a job midway through a pay period, leaving before it ends, taking unpaid days, or changing hours partway through all mean being paid for only part of a period. The usual approach is a simple ratio: the share of the period you are paid for, times the full-period amount. Choose whether to prorate by days or by hours, enter the full amount and the two counts, and the calculator shows the proration percentage, the prorated pay, the amount left out, and the pay per day or hour. It is a mathematical estimate — check it against the method your employer’s payroll actually uses.
How to use the Pay Period Proration Calculator
- Choose Days or Hours.
- Type the pay for a full period, such as 2,000.
- Type the payable days or hours in a full period, and the days or hours to pay. Count both the same way — working days with working days, calendar days with calendar days.
- Read the prorated pay, the proration percentage, the amount excluded, and the pay per day or hour.
The formula
Proration = days (or hours) to pay ÷ days (or hours) in the full period
Prorated pay = full-period pay × proration
Excluded = full-period pay − prorated pay
The prorated pay is rounded to the cent once, and the excluded amount is the full pay minus that rounded figure, so the two always add back up to the full period. The first two examples show how much the choice of days matters: the same $2,000 period is prorated differently when counted as 10 working days or 14 calendar days.
| Full period and days or hours paid | Proration | Prorated pay |
|---|---|---|
| $2,000.00, 6 of 10 days | 60% | $1,200.00 |
| $2,000.00, 12 of 14 days | 85.7143% | $1,714.29 |
| $3,000.00, 52.5 of 80 hours | 65.625% | $1,968.75 |
| $4,166.67, 11 of 22 days | 50% | $2,083.34 |
| $2,500.00, 7 of 22 days | 31.8182% | $795.45 |
Calculated on your device
- The calculation runs in your browser as you type; nothing is sent to a server.
- Pay amounts, days, hours, and results are not sent to Looty Tools or stored.
- The calculator area is masked from session-recording analytics, so what you enter isn’t captured in recordings.
Limitations
- This is a mathematical estimate from the amounts you enter. Employers may prorate by calendar days, working days, hours, or an annual-salary formula, and it does not account for overtime rules, taxes, deductions, employer policies, union agreements, or other payroll rules.
- It uses the plain ratio of the numbers you enter. Payroll methods based on an annual salary divided by a fixed number of days, or on a daily rate, can give a slightly different figure.
- It doesn’t count days between dates for you — the Days Between Dates Calculator can help with that.
- The days or hours to pay can’t exceed the full period; up to 10,000 days or hours.
- The $ is a display label; the math is the same in any currency.
Related calculators
- Percentage CalculatorFind a percentage of a number.
- Days Between Dates CalculatorCount the days from one date to another.
- Rotating Shift Hours CalculatorAdd up hours across a rotating shift pattern.
Guides
- How to Prorate PayThe proration formula with worked examples by working days and by hours, monthly salaries, and how rounding to the cent works.
- Calendar vs. Working DaysHow counting calendar days or working days changes prorated pay for the same absence or start date, and why month length matters.
- Starting or Leaving Mid-PeriodWorked examples of prorated pay for a first paycheck and a last paycheck, when proration applies, and what else a first or final check can include.
Pay Period Proration Calculator FAQ
- How do you prorate a paycheck?
- Divide the days (or hours) to be paid by the payable days (or hours) in a full period, and multiply the full-period pay by that fraction. Six of ten working days of a $2,000.00 period is 60%, or $1,200.00, leaving $800.00 out.
- Should I use calendar days or working days?
- Use whichever your employer uses, and the same kind in both boxes. They give different answers: 8 of 10 working days of $2,000.00 is $1,600.00, while 12 of 14 calendar days is $1,714.29.
- When should I prorate by hours instead?
- When pay for the period is based on scheduled hours — for example 80 hours in a two-week period. 52.5 of 80 hours of a $3,000.00 period is 65.625%, or $1,968.75.
- Why might my employer’s figure be different?
- Payroll systems prorate in different ways. Some use a daily rate from an annual salary (such as salary ÷ 260 working days), some count calendar days, and some round differently. This calculator uses the plain ratio of the numbers you enter.
- Does it include taxes, deductions, or overtime?
- No. It prorates the amount you enter and nothing else. It does not account for overtime rules, taxes, deductions, employer policies, union agreements, or other payroll rules.
- Are the amounts I enter sent anywhere?
- No. The calculation runs in your browser as you type. The amounts, rates, and results are not sent to Looty Tools or stored, and the calculator area is masked from session-recording analytics. Refreshing the page clears it.
