Payroll final-period proration calculator

Calculate calendar-day proration and scheduled-working-day proration with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

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Use calendar-day proration and scheduled-working-day proration to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Full-period salary ($)
3000
Pay period starts, inclusive
2026-10-01
Pay period ends, inclusive
2026-10-31
Employment interval starts, inclusive
2026-10-16
Employment interval ends, inclusive
2026-10-31
Scheduled weekdays: Monday 1 through Sunday 7
1,2,3,4,5
Excluded scheduled dates, comma-separated, or none
none
Working days in annual divisor
260
Calendar-day proration ($)
$1,548.39
Scheduled-working-day proration ($)
$1,500.00
Annualised salary / entered divisor proration ($)
$1,523.08
Pay-period calendar and scheduled days
31, 22
Employed calendar and scheduled days
16, 11

Try another scenario

Full-period salary ($)
3000
Pay period starts, inclusive
2026-10-01
Pay period ends, inclusive
2026-10-31
Employment interval starts, inclusive
2026-10-01
Employment interval ends, inclusive
2026-10-31
Scheduled weekdays: Monday 1 through Sunday 7
1,2,3,4,5
Excluded scheduled dates, comma-separated, or none
none
Working days in annual divisor
260
Calendar-day proration ($)
$3,000.00
Scheduled-working-day proration ($)
$3,000.00
Annualised salary / entered divisor proration ($)
$3,046.15
Pay-period calendar and scheduled days
31, 22
Employed calendar and scheduled days
31, 22
Calculation method

Calculation method

Calendar-day proration ($)

Full-period salary×employed calendar days/period calendar days.

Scheduled-working-day proration ($)

Full-period salary×employed scheduled days/period scheduled days.

Annualised salary / entered divisor proration ($)

Full-period salary×12×employed scheduled days/entered annual divisor; this treats the supplied salary as monthly.

Pay-period calendar and scheduled days

Inclusive day counts, excluding supplied dates only from scheduled-day counts.

Employed calendar and scheduled days

Intersect employment interval with the period, then count the same two bases.

Symbols and units
a
Full-period salary ($)
b
Pay period starts, inclusive
c
Pay period ends, inclusive
d
Employment interval starts, inclusive
e
Employment interval ends, inclusive
f
Scheduled weekdays: Monday 1 through Sunday 7
g
Excluded scheduled dates, comma-separated, or none
h
Working days in annual divisor

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • Compares three explicit proration conventions rather than choosing one. The third convention assumes a monthly salary; no contract, entitlement or statutory divisor is inferred.
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These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.

Further reading

US Department of Labor: pay/time recordkeeping background; actual rules vary ↗

Background reading; this does not imply endorsement or independent review of SumFizz.

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