Enter Custody Schedule Inputs
Results appear above this form after submission. Use whole or decimal values where needed.
Plotly Graph
This chart compares annual overnights and percentage shares for both parents based on the current inputs.
Example Data Table
Use this sample to understand how the calculator combines regular, holiday, vacation, and adjustment inputs.
| Example Input | Sample Value |
|---|---|
| Total nights in period | 365 |
| Regular weekly overnights for Parent A | 2 |
| Alternating weekend nights for Parent A | 2 |
| Holiday overnights for Parent A | 12 |
| Vacation weeks for Parent A | 2 |
| Vacation nights per week | 7 |
| Special event overnights | 4 |
| Makeup overnights | 2 |
| Missed overnights | 1 |
| Manual adjustment | 0 |
| Sample result for Parent A | 187 overnights (51.23%) |
| Sample result for Parent B | 178 overnights (48.77%) |
Formula Used
Parent A Overnights = (Regular Weekly Overnights × 52) + (Alternating Weekend Nights × 26) + Holiday Nights + (Vacation Weeks × Vacation Nights per Week) + Special Event Nights + Makeup Nights + Manual Adjustment − Missed Nights
Boundary rule: The calculator limits Parent A overnights between 0 and the selected total nights in the period.
Other parent formula: Parent B Overnights = Total Nights − Parent A Overnights.
Percentage formula: Parent Percentage = (Parent Overnights ÷ Total Nights) × 100.
This method is useful for schedule review, mediation preparation, and recordkeeping. Court methods and local rules may apply different definitions or counting standards.
How to Use This Calculator
- Enter labels for both parents so the results read clearly.
- Set the total number of nights in the period, usually 365 or 366.
- Enter regular weekly overnights for one parent.
- Add alternating weekend nights that happen every other weekend.
- Include holiday, vacation, special-event, and makeup overnights.
- Subtract missed overnights and enter any manual annual adjustment.
- Submit the form to view percentages, annual totals, and the comparison chart.
- Use the CSV or PDF downloads to save the results.
Frequently Asked Questions
1. What does overnight custody percentage mean?
It shows the share of total annual nights each parent has with the child. Many parenting schedules are discussed using overnight percentages because nights are easy to count and compare.
2. Does this calculator replace legal advice?
No. It is an educational planning tool. Courts, attorneys, and local statutes may use different standards, definitions, or recordkeeping methods when reviewing parenting-time schedules.
3. Why are alternating weekend nights multiplied by 26?
There are about 52 weeks in a year, so an every-other-weekend pattern usually occurs 26 times annually. Multiply nights per alternating weekend by 26 for an annual estimate.
4. Can I use 366 nights instead of 365?
Yes. For leap years or custom planning periods, enter 366. The calculator automatically uses your selected total nights when computing percentages and balancing the other parent’s share.
5. How should I enter vacations?
Enter the number of vacation weeks and the usual nights per vacation week. This makes longer school-break schedules easier to estimate without listing every single overnight separately.
6. What if scheduled overnights were missed?
Use the missed-overnights field to reduce the yearly total. If those nights were later replaced, add them in the makeup-overnights field for a more accurate net result.
7. Can this help with mediation discussions?
Yes. It can support schedule review, scenario comparison, and written summaries. It is especially useful when parents want a neutral estimate before discussing adjustments.
8. Why might court calculations differ from this result?
Some jurisdictions count partial nights, exchanges, school-year splits, or holiday rules differently. This tool gives a consistent estimate, but official outcomes may depend on local rules and court interpretation.