Skip to content
ENExplore Calculators

Parenting Time/Custody Calculator

Calculate parenting time percentages across a custody schedule.

About Parenting Time/Custody Calculator

Overnights rather than hours are the standard measure because they capture responsibility for meals, bedtime and mornings. Support formulas frequently step at thresholds such as 35 or 40 per cent, so small changes can matter greatly. Because support can change sharply at a threshold, the difference between five and six overnights a fortnight can have financial consequences out of proportion to the time involved.

Formula

Parenting Time/Custody

Share of overnights = annual overnights ÷ 365, the usual basis for support calculations

overnight
The standard unit for parenting time, since it captures full care days
shared care thresholds
Many jurisdictions apply support changes at specific percentages

Worked example

With the default values below, Parenting Time/Custody Calculator returns Parent A Share of Overnights of 41.468%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Overnights per fortnight with parent Aaccepts 0–14
5
Additional holiday nights with parent Aaccepts 0–200
21
Additional daytime hours with parent Aminimum 0 h
8 h

Results

Parent A Share of Overnights
41.468%
Parent A Annual Overnights
151.4 nights
Parent B Annual Overnights
213.6 nights
Parent A Share Including Daytime
43.849%
Arrangement Type
Substantial shared care

Step by step

  1. 1Values used
  2. 2Parenting Time/Custody
  3. 3Parent A Share of Overnights= 41.468
  4. 4Parent A Annual Overnights= 151.4 nights
  5. 5Parent B Annual Overnights= 213.6 nights
  6. 6Parent A Share Including Daytime= 43.849
  7. 7Arrangement Type= Substantial shared care

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • This is a general illustrative estimate and is not legal advice. Laws, formulas and guidelines vary substantially by jurisdiction and change over time, and courts retain discretion. Consult a qualified lawyer in your jurisdiction before relying on any figure here.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

This is a general illustrative estimate and is not legal advice. Laws, formulas and guidelines vary substantially by jurisdiction and change over time, and courts retain discretion. Consult a qualified lawyer in your jurisdiction before relying on any figure here.

Frequently Asked Questions

How is Parenting Time/Custody calculated?

Share of overnights = annual overnights ÷ 365, the usual basis for support calculations Overnights rather than hours are the standard measure because they capture responsibility for meals, bedtime and mornings. Support formulas frequently step at thresholds such as 35 or 40 per cent, so small changes can matter greatly.

Why does Parenting Time/Custody matter?

Because support can change sharply at a threshold, the difference between five and six overnights a fortnight can have financial consequences out of proportion to the time involved.

What values do I need to enter?

This calculator takes 3 inputs: Overnights per fortnight with parent A, Additional holiday nights with parent A, Additional daytime hours with parent A. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

Related Calculators

Parenting Time/Custody Calculator | Calcrivo