Parenting Time Calculator

One letter per night of the cycle: A for the first parent, B for the second. Any length.
The date the pattern’s first letter applies to. Most rotations are written from a Monday.
The night starting on this date is not counted, so a year runs from a date to the same date.
Parent A share
50.00 %
Parenting Time Percentage Calculator
Parent A overnights
182 nights
Parent B overnights
182 nights
Overnights in the period
364 nights
Parent B share
50.00 %
Parent A overnights a year
182.5 nights
Parent B overnights a year
182.5 nights
Length of the cycle
14 days
Split within one cycle
7 / 7 of every 14 nights
Pattern
AABBAAABBAABBB
The cycle starts on a
Monday
Summary
182 overnights with parent A and 182 with parent B over 364 nights: 50% / 50%.
Worked out from US Office of Child Support Services, "Child Support and Parenting Time" and state guideline reviews and 1 other source.
This counts a schedule; it does not apply any state’s support formula or account for holidays and vacation time, which most parenting plans allocate separately.

How this is worked out

4 steps
  1. Rotation: 2-2-3 rotation, written as AABBAAABBAABBB from 2026-01-05 (a Monday).
  2. Within one 14-night cycle the split is 7 to 7.
  3. 2026-01-05 to 2027-01-04 spans 364 days, which is 364 overnights - the night beginning on the end date is not counted.
  4. Counting each night against the pattern gives 182 for parent A and 182 for parent B, or 50% / 50%.

Results are general information, not financial, tax, legal, medical or engineering advice.