Free Parenting Time Calculator

A parenting time calculator is a free tool that converts a co-parenting schedule into custody percentages and overnight counts. You enter your repeating schedule (for example, 50/50 week-on/week-off, 2-2-3, or every other weekend) and the calculator returns each parent's share of the year, average days per month, and total overnights, which is the metric most family courts use to evaluate custody.

Custody percentage is calculated by counting overnights. Take the number of nights a child spends with each parent in the repeating cycle (usually 14 days), divide by the total nights in the cycle, and multiply by 100. Most courts and child support guidelines use overnights rather than total hours because overnights are easier to verify and less ambiguous than partial-day visits.

A 50/50 parenting schedule splits time equally between two co-parents, giving each parent about 182-183 overnights per year. Common 50/50 patterns include week-on/week-off, 2-2-3 (alternating short blocks with a three-day weekend), 2-2-5-5, and 3-4-4-3. The right pattern depends on the child's age, the parents' work schedules, and how close the two homes are.

Yes. Most US states factor parenting time into child support calculations, and some apply a discount or shared-parenting adjustment when one parent has more than a threshold number of overnights (often around 73, 92, or 128 nights per year, depending on the state). The exact formula varies, so check your state's guidelines or talk to a family law attorney for advice on your situation.

The simplest way is to map your schedule onto a repeating 14-day cycle and count the overnights for each parent, then multiply by 365/14 to get an annual total. Use this calculator to do the math automatically, then keep a shared calendar (Google Calendar, Cozi, OurFamilyWizard, or a paper planner) to log any deviations like makeup days or holiday swaps.