Custody Percentage Calculator
Calculate your exact parenting time percentage based on overnights and hours per year, crucial for child support formulas.
Built for general U.S. informational use. Local rules, court practices, and case facts can change the result.
Custody Percentage Calculator
Fill in the fields below to get your estimate
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.
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.
How this estimate works
This calculator converts a parenting schedule into a percentage using overnights and optional hour-based detail. It helps users compare schedules before applying state-specific child-support or custody rules.
Inputs this page weighs
- Total annual overnights.
- Partial-day or hour assumptions if relevant.
- Holiday and school-break schedule changes.
- Whether the local worksheet counts time differently.
How to verify the result
Compare the percentage with a full-year calendar and your court or agency worksheet before using it in support calculations.
How to use this Custody Percentage Calculator well
Best used when
- Calculating parenting-time share from a real overnight schedule.
- Comparing proposed schedules before mediation or worksheet completion.
- Turning a calendar into a percentage that can be discussed more clearly.
Be careful if
- Different courts count overnights, partial days, and holiday blocks differently.
- A school-year average may not match the summer or holiday schedule.
- A small counting change can matter when a formula threshold is close.
Questions to answer next
- Are you using a full-year calendar that includes holidays and school breaks?
- Does your court or worksheet use overnights, hours, or another counting method?
- Will the proposed parenting plan differ enough from the current practice to change support?
Before you use a family law calculator
What to gather first
- Recent pay stubs, tax returns, and proof of recurring income or bonuses.
- Health insurance costs, childcare costs, and any existing court orders.
- A realistic parenting schedule or overnight calendar if custody affects the estimate.
Why results may change
- State guidelines may use different income definitions, deductions, or formula tables.
- Judges can depart from the standard worksheet when a strict formula would be unfair.
- Support and property estimates often change once full financial disclosures are exchanged.
Best next step
- Save your estimate and compare it with your actual monthly documents.
- Make a list of expenses that are easy to miss, such as healthcare, childcare, and debts.
- Verify the result with a state-specific worksheet, mediator, or family law attorney.