Family Law

Custody Percentage Calculator

Calculate your exact parenting time percentage based on overnights and hours per year, crucial for child support formulas.

Free to Use No Data Stored Updated April 2026

Custody Percentage Calculator

Fill in the fields below to get your estimate

Common References:
• Every other weekend (2 nights): ~52 nights/yr
• Extended alternative weekend (3 nights): ~78 nights/yr
• 50/50 Custody: 182.5 nights/yr

Calculating Your Parenting Time

Accurately determining your exact percentage of parenting time is one of the most critical steps in any divorce or child custody case. This percentage directly impacts child support calculations in almost every US jurisdiction.

The "Overnight" Standard

Family courts prefer to calculate time using Overnights. An overnight is defined as the child staying with you through the night until the next morning. There are 365 overnights in a standard year.

Daytime Hours Equivalent

If you have significant daytime visitation but the child doesn't sleep at your house, you can estimate your time by calculating total annual hours. 8,760 hours make up a standard year. This calculator converts overnights directly into your time percentage.

Frequently Asked Questions

In most states, the amount of child support you pay or receive is heavily influenced by the percentage of time you spend with the child. Even a difference of 5% can change child support payments by hundreds of dollars.

Courts traditionally use "overnights" to calculate parenting time. If a child sleeps at your house 100 nights out of the year, your overnight time is roughly 27% (100 / 365).

If you have daytime visits but the child doesn't stay overnight, some states (like California) allow you to convert those hours into equivalent overnights. For example, 24 hours of total daytime visits over a month equals 1 overnight.

A 50/50 schedule means each parent has exactly 50% of the time (182.5 overnights each). Common 50/50 schedules include week-on/week-off, or the "2-2-3" schedule (2 days Parent A, 2 days Parent B, 3 days Parent A).

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