California Child Support Calculator
A free estimate based on California's statewide guideline formula. The same inputs DCSS and family courts use.
About this calculator
California uses a single statewide guideline formula, set in Family Code §4055, to determine the presumptive child support amount in every county. This calculator runs that formula with the inputs DCSS and the courts use.
The result is an estimate. A judge can order a different amount in some cases, and costs like uninsured medical bills and work-related childcare are typically split on top of the guideline number.
For background on how the program works in California, see our complete guide to California child support. DCSS also publishes its official guideline calculator.
Frequently asked questions
How is California child support calculated?
California uses a single statewide guideline formula, set in Family Code §4055. It combines both parents’ net disposable income and the percentage of time each parent has primary physical responsibility for the child. Every county and every judge starts from the same number.
What if a parent is unemployed?
The court can impute earning capacity to a parent who is voluntarily unemployed or underemployed, based on their ability and opportunity to work. Quitting a job rarely lowers a support amount on its own.
How is custody time counted?
It is the percentage of time the parent has primary physical responsibility for the child. Most California courts measure this in overnights per year, but local rules vary. If you and the other parent share custody 50/50, your timeshare is 50%.
Can the parents agree to a different amount?
Yes, with court approval. The court will only sign off when both parents have full information, the agreement is voluntary, and the children’s needs are met.
How often can child support be modified?
There is no minimum waiting period. Either parent can ask for a review whenever there has been a material change in circumstances.
Is this calculator legally binding?
No. It produces an estimate using the guideline formula. Only a judge or commissioner can issue a binding child support order.
Disclaimer
This calculator produces an estimate based on California's statewide guideline formula. It is not legal advice and is not a substitute for an attorney or a court order. Only a judge or commissioner can issue a binding child support order. Inputs you supply are sent to the calculator app and are not stored on this page.