50/50
Parent A
49.9%
182 overnights
Parent B
50.1%
183 overnights
Parenting time calculator
Custody Percentage Calculator
Estimate parenting time percentages from overnight counts. Enter how many overnights each parent has to calculate custody percentages and total overnights.
Calculator
Calculate custody percentage
Parent A
49.9%
182 overnights
Parent B
50.1%
183 overnights
Results
Total overnights: 365
Parent A has 182 overnights (49.9%). Parent B has 183 overnights (50.1%). This is generally considered a 50/50 parenting time split.
Examples
Common custody percentage examples
60/40
Parent A
60.0%
219 overnights
Parent B
40.0%
146 overnights
70/30
Parent A
70.1%
256 overnights
Parent B
29.9%
109 overnights
80/20
Parent A
80.0%
292 overnights
Parent B
20.0%
73 overnights
How custody percentage is calculated
Custody percentage is commonly estimated from overnights. Divide one parent’s overnights by the total overnights, then multiply by 100. For example, 182 overnights out of 365 is about 50%.
This calculator is a planning tool. Actual parenting time rules can vary by jurisdiction, court order, holidays, and how partial days are counted.
FAQ
How is custody percentage calculated? +
Custody percentage is usually calculated by dividing one parent’s overnights by the total overnights in the period, then multiplying by 100.
Is this the same as a parenting time calculator? +
It is closely related. A parenting time calculator may include hours, days, or holidays, while this simple calculator focuses on overnight counts.
How many overnights is 50/50 custody? +
In a 365-day year, 50/50 custody is usually about 182 or 183 overnights for each parent.
Can custody percentages vary by month? +
Yes. Some schedules are not perfectly equal every month but balance across the full repeating cycle or year.