Custody Calculator: The Complete Guide

Alternating weeks, 2-2-5-5, alternating weekends… With so many custody rhythm options, it can be hard to know which one will work best for your family. The Custody Schedule rhythm calculator lets you simulate each option with one click and visualize the entire year before making a decision. This guide walks you through it step by step.

What is the custody rhythm calculator?

The rhythm calculator is the heart of the Custody Schedule simulator. It's a visual, interactive tool that automatically generates a full custody calendar from a few simple parameters: rhythm type, start date, starting parent, and school holiday zones.

It lets you:

• View the entire year at a glance
• Compare different rhythms without affecting your real schedule
• Calculate the percentage of time spent with each parent
• Export the calendar as ICS (Google Calendar, Apple Calendar, Outlook)
• Share the schedule with your co-parent

The different types of custody rhythms

Custody Schedule supports all commonly used custody rhythms. Here are the main ones:

Alternating weeks (1 week / 1 week)

The most common rhythm. The child spends one week with one parent, then one week with the other. The switch usually happens on Monday or Friday. Simple, predictable, and easy to visualize. Best suited for children aged 5+ and parents living within reasonable distance.

• Pros: simplicity, stability, long-term visibility
• Cons: a full week without the other parent can feel long for young children
• Ideal for: organized parents, school-aged children, moderate distance between homes

2-2-5-5 rhythm

A 14-day cycle: 2 days with one parent, 2 with the other, 5 with the first, 5 with the second. This alternates short and long periods, so the child never goes too long without seeing either parent, while still having full weeks for stability.

• Pros: balance between presence and continuity, ideal for younger children
• Cons: more complex to remember, more frequent transitions
• Ideal for: preschool / elementary children, parents available for weekday transitions

Alternating weekends + Wednesdays

One parent has the child on weekdays (primary residence), the other picks them up every other weekend and Wednesday. This was the traditional custody model before shared custody became common. Still relevant when parents live very far apart.

• Pros: school stability, fewer transitions
• Cons: unequal parenting time, mental load on the hosting parent
• Ideal for: long distances, teenagers, high-conflict situations

Custom schedule (day by day)

Build your own rhythm, day by day, week by week. Useful for parents with shift work, traveling professions, or medical constraints.

Multi-rhythm with school holidays

The simulator lets you apply a different rhythm during school holidays (e.g., alternating weeks during school time, full months with each parent in summer). Holiday zones for France (A, B, C), Belgium, Switzerland, Luxembourg, and Quebec are integrated automatically.

How to use the Custody Schedule calculator

You don't need to be a scheduling expert. Here are the 4 steps to get your personalized calendar.

Step 1 — Create your household

Go to the simulator and create your household. You can do it alone (draft mode) or invite your co-parent directly. One household = one family, with one or more children.

Step 2 — Set the starting point

Choose the start date, which parent has the child on that date, and the handover time (e.g., Monday at 6 PM). These parameters determine the entire calendar.

Step 3 — Choose and visualize the rhythm

Select the rhythm type (alternating weeks, 2-2-5-5, etc.) and see the result instantly. The calendar uses distinct colors for each parent, plus holidays, school breaks, and exceptions. Navigate by month or by year.

Step 4 — Add school holidays

The simulator automatically imports school holidays based on your selected zone. Choose the holiday alternation mode: full month, two-week blocks, or exact mid-point. The split follows your even/odd year parity or custom configuration.

Rhythm comparison table

Calculating time spent with each parent

The simulator automatically calculates the yearly time split, in days and nights. This information is useful for:

• Verifying the balance of your chosen schedule
• Preparing documentation for court (if needed)
• Estimating eligibility for certain benefits (depending on your country)
• Adjusting exceptions to maintain yearly balance

Note: Custody Schedule provides an estimate. Only a lawyer can advise you on the exact legal implications of your custody split.

Real-life scenarios

Family with 2 children on a 2-2-5-5 rhythm

Sophie and Marc have two children (ages 6 and 9). They chose the 2-2-5-5 rhythm so the kids never go more than 2 days without seeing either parent. Monday and Thursday are transition days. Sophie set up the schedule in October, and Christmas holidays aligned automatically with Zone C. Result: a fair 50/50 split with minimal conflict.

Shared custody + extracurricular activities

Thomas (8) does judo on Wednesdays and swimming on Saturdays. His parents added recurring activities to the calendar. Now each parent knows who picks him up for which activity, even during the other parent's week. No more "I thought it was your turn" arguments.

Traveling parent — recurring exceptions

Julie travels one week per month for work. Her base schedule is alternating weeks, but she creates recurring exceptions for her travel weeks: the child stays with dad those weeks, with a makeup weekend after. All exceptions are pre-programmed for the full year.

FAQs about custody rhythms

Ready to calculate your schedule?

No commitment required. The Custody Schedule simulator is free, with no sign-up needed to explore rhythms. Create a schedule, compare options, and when you're ready, invite your co-parent to review it together.