California Child Support Calculator

Based on Cal. Fam. Code § 4055. Uses the algebraic K-factor formula with net income computed from gross per § 4059. Step-by-step breakdown included.

Children & Custody

Parent A

Parent B

Add-ons

Start with the basics

Tell us how many children are covered by this order and how custody time is split.

How many children?

Percentage of time children spend with Parent A

Enter 0–100. Equal sharing = 50. Used to compute the K-factor under § 4055.

Equal custody (50/50)

This is a default proceeding

The other parent did not appear in court. H% will be set to 0 per § 4055(b)(6).