Welcome to the Guideline Calculator

The California Guideline Child Support Calculator is based on California Child Support Guidelines and can be used to estimate the amount of child support that may be ordered in your case.

The Court Commissioner or Family Law Judge has the final authority to determine the amount of a child support order. This calculator provides only an estimate and is not a guarantee of the amount of child support that will be ordered. Other factors may affect the amount of child support awarded.

If you have any questions about the child support guidelines, you should talk with a lawyer or contact a family law facilitator.

Guideline Calculator Links

Qualified Business Income Deduction (QBID) Calculator

The Qualified Business Income Deduction (QBID) calculator is an Excel tool provided by DCSS to assist Guideline Calculator users in determining the amount of any QBID they may need to enter in the Monthly Deduction Information section of the Guideline Calculator. The QBID calculator provides only an estimated amount of QBID based on the information entered by the user. Do not use the QBID calculator for tax return preparation or for any purpose other than support calculations. Only the original Excel tool available through this link should be relied upon by the users. Any version downloaded and presented by others may have altered formulas affecting the result. The QBID calculator was developed by the Ventura County Local Child Support Agency and has been certified by an independent CPA.