Custody Nights Percentage Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the nights per year with each parent.
- Read each parent's percentage.
How it works
Each parent's percentage = their nights ÷ total nights × 100.
Worked example
104 vs 261 nights. ≈ 28.5% / 71.5%.
Common mistakes
- Counting days instead of overnight stays — care is usually measured in nights.
- Assuming this defines legal care — definitions vary by purpose.
Frequently asked questions
Is this legal or child-support advice?
No — it's a simple share of overnights. Care percentages for legal or support purposes can be defined differently; seek proper advice.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.