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Prorated Bonus Calculator

Enter the full bonus and days worked to find the prorated amount.

How it is calculated

The tool scales the full bonus by the share of the period worked: fraction = worked ÷ total and bonus = full × fraction. Here full is the bonus for the whole period, worked is the days (or other unit) you were eligible, and total is the length of the whole period in the same unit. It also shows the fraction as a percentage and the forfeited amount, full − bonus. Total must be above zero, worked cannot be negative, and worked cannot exceed total; otherwise there is no result. Amounts are shown in dollars. The tool uses straight proportion and does not know your employer's rules on working days versus calendar days, whole months, minimum service or unpaid leave, and it applies no tax.

Worked example

The yearly bonus is $12,000 and the employee worked 200 days of a 365-day year. Fraction: 200 ÷ 365 = 0.5479, or 54.79%. Prorated bonus: 12,000 × 0.5479 = $6,575.34. Forfeited part: 12,000 − 6,575.34 = $5,424.66. If the plan counted months instead (6.5 of 12), the result would be $6,500.00, so check how your bonus plan counts service.

Try this example →

Common mistakes

  • Mixing units, such as 200 working days against a 365-day total. Worked and total must use the same unit, both calendar days or both working days.
  • Entering 366 as the total for a leap year but counting worked days on a 365-day basis. Both numbers should come from the same calendar.
  • Entering more worked days than the period has. The tool then shows no result, so check for a typo or the wrong total.
  • Assuming every plan prorates by days. Some prorate by whole months or pay nothing before a minimum service date, so the result may differ from what payroll pays.
  • Treating the amount as net pay. It is a gross figure; tax and other deductions are not applied.

Sources

  • Prorated — Corporate Finance Institute

About this calculator

Prorating a bonus means scaling the full-period bonus amount down to reflect only the portion of the period actually worked — the standard approach is (days worked ÷ total days in the period) × full bonus, though some employers count working days only or use months instead of days. This comes up whenever an employee doesn't work the entire bonus-eligible period: new hires who start partway through the year, employees who leave before the period ends, or workers returning from extended unpaid leave.

This calculator takes the full bonus amount and the days actually worked, and returns the prorated payout along with the percentage of the period it represents. HR and payroll teams processing mid-year hires or departures, and employees checking that a partial bonus was calculated correctly use it to get a clear, defensible number instead of an ad hoc estimate.

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Comments (1)

  • Editorial team

    The tool returns a gross figure for a pure share of time, so plan rules can change what you really receive. For 10,000 and 180 days out of 365 the share is 49.32% and the bonus 4,931.51, with 5,068.49 left over. Six months out of 12 would give exactly 5,000.00. Some plans pay nothing without employment on the payout date, and withholding comes off afterward. Does your plan prorate by days, months or quarters?

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