Custody Time-Sharing Percentage Calculator
Enter the number of overnights each parent has with the child in a typical year to calculate the exact custody time-share percentage — often used in parenting plans and child support calculations.
About this calculator
Calculate each parent's percentage of overnight custody time per year based on a proposed parenting schedule.
Frequently Asked Questions
Why does custody percentage matter?
Many states use the percentage of overnight custody time to determine child support obligations and to classify a schedule as sole, primary, or joint custody.
What counts as an overnight for custody purposes?
Generally, whichever parent the child sleeps with counts for that night, though some jurisdictions have specific rules for shared or split nights — check your local family court guidelines.
What percentage is considered 'joint custody'?
Definitions vary by state, but many consider a roughly 60/40 to 50/50 split as joint or shared physical custody, while anything more lopsided is typically called primary or sole custody.