Custody Time Percentage
Turn nights with each parent into a custody percentage.
About Custody Time Percentage
Weekly overnights with one parent scale to a yearly figure, then extra holiday nights are added on top. The share of the 365-night year becomes each parent's custody percentage. Custody percentages directly drive child support calculations in many places, so parties and courts need a defensible yearly numbers from the plan on paper.
Formula
Custody Time Percentage
Percent A = nights per year with A / 365; percent B = 100 - percent A
- overnights
- Nights the child sleeps at one parent's home
Worked example
With the default values below, Custody Time Percentage returns Parent A Percentage of 74.0%. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Nights per week with parent Aaccepts 0–7
- 5
- Extra holiday nights with Aminimum 0
- 10
Results
- Parent A Percentage
- 74.0%
- Parent B Percentage
- 26.0%
- Nights per Year with A
- 270
- Nights per Year with B
- 95
Step by step
- 1Values used
- 2Custody Time Percentage
- 3Parent A Percentage= 74.0
- 4Parent B Percentage= 26.0
- 5Nights per Year with A= 270
- 6Nights per Year with B= 95
Assumptions and limits
- The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
- For planning estimates only; actual support and custody rules vary by jurisdiction.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
For planning estimates only; actual support and custody rules vary by jurisdiction.
Frequently Asked Questions
How is Custody Time Percentage calculated?
Percent A = nights per year with A / 365; percent B = 100 - percent A Weekly overnights with one parent scale to a yearly figure, then extra holiday nights are added on top. The share of the 365-night year becomes each parent's custody percentage.
Why does Custody Time Percentage matter?
Custody percentages directly drive child support calculations in many places, so parties and courts need a defensible yearly numbers from the plan on paper.
What values do I need to enter?
This calculator takes 2 inputs: Nights per week with parent A, Extra holiday nights with A. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.