Educational only: Work and pay decision support, not tax, legal, financial or career advice.
Privacy: No account is required. Tool inputs and results stay in this browser. Anonymous categorical usage analytics send only governed page, tool, cluster and action identifiers; tool inputs and results are never sent. Error monitoring is disabled. Optional saved state stays only on this device.
Update policy: Reviewed when formulas or official dependencies change.
Scope: Market-neutral work and pay planning using your own assumptions.
What this calculator helps you decide
Best for
Estimating the portion of annual gross salary that applies to a partial period.
Outputs
Prorated salary, excluded salary and eligible fraction.
Start here
Enter annual salary and consistent eligible and total period units.
- Close-intent boundary
- Do not use this to compare salary at different weekly hours; use Part-Time Salary Equivalent for that schedule decision.
Compare pay and working hours
Prorated Salary: prorated salary
Prorated salary, excluded salary and eligible fraction.
Salary and eligible period
Enter the full annual salary and a consistent eligible-to-total period.
Your numbers stay in this browser
Full annual gross salary before proration.
Months, days or custom units included. This is reduced visibly if it exceeds the basis total.
Choose months, calendar days, working days or another consistent unit.
Calculated result
The result shows both the included and excluded portions of the annual salary.
Use one currency consistently across all inputs.
PDF and CSV exports stay on this device. Clean page links contain no inputs.
Scenario comparison
Each row names the assumption axis changed from the baseline.
ScenarioResultDifference
Entered scenario63,000.00Baseline
Eligible units: 1070,000.007,000.00
Save these results, change an input, then compare the updated figures with this baseline.
The baseline is temporary in this tab and is not added to shared scenario links or generated reports.
Calculation details
View calculation detailsView the formulas and inputs used for these results.
Prorated salary
Prorated salary
proratedSalary = annualSalary × eligibleUnits ÷ totalUnits63,000.00 currency unitsResult63,000.00 currency units
Annual salary multiplied by the eligible fraction. Displayed using the engine-rounded value.
Prorated salary formula →Excluded salary portion
Excluded salary portion
excludedSalary = annualSalary − proratedSalary21,000.00 currency unitsResult21,000.00 currency units
Annual salary minus the prorated amount. Displayed using the engine-rounded value.
Excluded salary portion formula →Eligible fraction
Eligible fraction
fraction = eligibleUnits ÷ totalUnits75%Result75%
Eligible units divided by total units. Displayed using the engine-rounded value.
Eligible fraction formula →Inputs used
- Annual salary
- 84,000.00 currency units
- Eligible units
- 9
- Proration basis
- 0
Open this calculator with preset values
This calculator supports documented, shareable scenario URLs. Compatible assistants and applications can construct links using the parameters below.
Scenario values are visible in the URL, calculations run in the browser, and optional saved state stays only on this device. Anyone you share the URL with can read those numbers, so do not include private or identifying data.
| Parameter | Meaning | Unit | Allowed values | Presence | Default |
|---|---|---|---|---|---|
| annualSalary | Full annual gross salary before proration. | currency units/year | 0.01 to 100000000 | Required | 84000 |
| eligibleUnits | Months, days or custom units included. This is reduced visibly if it exceeds the basis total. | selected units | 0 to 366 | Required | 9 |
| totalUnits | Months use 12; calendar days use 365 or 366. Other bases keep the entered total. | selected units | 1 to 366 | Required | 12 |
| basis | Choose months, calendar days, working days or another consistent unit. | selected basis | 0, 1, 2, 3 | Required | Months |
Prorated Salary: prorated salary
Use the prorated amount as a simple eligible-period share of annual gross salary.
Formula summary
- Primary formula
- proratedSalary = annualSalary × eligibleUnits ÷ totalUnits
Data used here
- The estimate uses your inputs and the work-value formula documented in the methodology.
Decision checks
Act on the result
Confirm the period basis and eligible units with the employer or contract.
Stress-test the decision
Retest using the employer’s actual month, calendar-day or working-day convention.
When this estimate can be misleading
- This does not model payroll cut-offs, paid leave or local employment rules.
- Working-day conventions differ by employer and must be entered consistently.
- Rounding on an actual payslip may differ.
- Use the prorated amount as a simple eligible-period share of annual gross salary.
Educational estimate, not advice. See all assumptions & limitations →
Related reading
Use these practical guides to interpret the decision and its assumptions.
- How to use the Prorated Salary calculator
Estimate the included and excluded portions of an annual salary using months, calendar days, working days or custom units.
Read guide
Frequently asked questions
What portion of an annual salary applies to this partial period?
Confirm the period basis and eligible units with the employer or contract.
Which official source and period does this use?
This market-neutral tool does not use an official local policy rule.
Can I share or save a scenario?
Tool inputs and results stay in this browser. Anonymous categorical usage analytics send only governed page, tool, cluster and action identifiers; tool inputs and results are never sent. Error monitoring is disabled. Optional saved state stays only on this device.
How should I use the calculated result?
Treat the calculated result as one scenario, then verify the input record with the greatest effect on that result.