California Child Support Calculator
Explore how parental income, parenting time, and the number of children affect California's basic child support formula.
Free • California • Planning EstimateThis is an unofficial educational estimator, not a certified California guideline calculator or a prediction of a court order.
It uses income figures you enter. It does not calculate taxes, all allowable deductions, or every legal adjustment. Actual child support may be substantially different.
View California's Official Guideline Calculator →
Step 1 — Children
💵 Step 2 — Monthly Parental Income
Enter each parent's estimated monthly California guideline net disposable income, not simply gross earnings or paycheck take-home pay.
❓ What is guideline net disposable income?
California starts with gross income and applies deductions permitted under Family Code Section 4059.
These may include actual federal and state tax liabilities, FICA, certain mandatory retirement or union contributions, qualifying health insurance premiums, and other legally permitted deductions.
Your regular take-home paycheck may not equal the income figure required under California's child support guidelines.
Read California Family Code 4059 →📅 Step 3 — Parenting Time
🏥 Step 4 — Additional Child Expenses
These optional costs will be shown separately for budgeting. They are not automatically added to the basic formula estimate.
Actual court-ordered add-ons, expense allocations, and health insurance obligations may differ. Do not enter health insurance premiums here if they are already reflected in your guideline net-income figure.
🔒 No names, addresses, or case numbers are needed. Do not enter identifying details into this calculator.
⚖️ Your Child Support Planning Estimate
This is an illustrative calculation of California's basic statutory formula, based on the inputs you provided. It is not a certified guideline result.
⚠️ Possible Low-Income Adjustment
Qualifying cases may receive a low-income adjustment under California Family Code 4055. The court determines how the adjustment applies.
🏥 Additional Expense Planning
📊 How This Estimate Was Calculated
California's basic statutory formula is:
CS = K × [HN − (H% × TN)]The calculation uses the higher earner's guideline net income, combined parental guideline net income, the higher earner's parenting time, and applicable child-count multiplier.
✅ Verify Your Estimate
For a more complete calculation, including applicable tax treatment, deductions, additional expenses, and other legal adjustments, use California's certified Guideline Calculator.
Open Official California Calculator →Educational estimates only. This tool cannot determine what a judge will order. Consult a qualified family-law professional or Family Law Facilitator for guidance about your circumstances.
📊 Child Support What-If Comparison Compare parenting-time scenarios without changing your original estimate.
⚖️ Compare Different Scenarios
See how changing parenting-time percentages may affect an illustrative California basic-formula child support calculation.
We'll use the number of children and both parents' guideline net incomes from the calculator above.
The first comparison uses your original Parent A parenting-time percentage. Parent B's percentage is the remainder.
📈 Your Scenario Comparison
Illustrative monthly basic-formula amounts before low-income adjustments, add-ons, or other legal deviations.
| Scenario | Parent A Time | Monthly Amount | Payment Direction |
|---|
These scenarios are examples for financial planning, not custody recommendations or court-approved child support amounts.
California's certified calculator can evaluate additional factors not included in these comparisons.
Open Official California Calculator →📅 Parenting Time Percentage Helper Estimate parenting time from a weekly schedule or annual overnights.
Calculate Your Parenting Time Percentage
Not sure what parenting-time percentage to enter in the Child Support Calculator? Use this helper to estimate Parent A's share of parenting responsibility.
California considers the time each parent has primary physical responsibility for the children. Overnight counts alone may not capture every arrangement.
⏰ Weekly Parenting Responsibility
💡 Include time based on actual physical responsibility, not just where the children sleep.
🌙 Annual Overnight Estimate
⚠️ Overnight percentages are only an approximation. They may differ from California's legally relevant parenting-time percentage, especially when a parent has substantial daytime responsibility.
📊 Estimated Parenting Time
⚖️ Important California Guidance
This helper provides an approximate planning percentage. It does not determine legal custody, visitation rights, or the parenting-time percentage a court will use.
If different children have different parenting schedules, or responsibility is disputed, additional analysis may be necessary.
Learn How California Calculates Parenting Time →💵 Monthly Income Helper Convert paychecks to monthly income and organize possible deductions.
Understand Your Monthly Income
California child support calculations use each parent's guideline net disposable income.
This helper converts earnings into monthly amounts and provides a worksheet for organizing possible deductions.
Your paycheck take-home pay is not necessarily your California guideline net disposable income.
This worksheet does not calculate tax liabilities, determine deduction eligibility, or establish official guideline net income.
👤 Parent A — Income Worksheet
➖ Organize Possible Monthly Deductions
Enter monthly amounts only. Do not double-count any deductions. Eligibility depends on California law and individual circumstances. These entries are not verified by this worksheet.
👤 Parent B — Income Worksheet
➖ Organize Possible Monthly Deductions
Only amounts actually permitted under the applicable guidelines belong in an official support calculation. These entries are for organizing information.
📊 Monthly Income Worksheet Results
Parent A
Parent B
These worksheet remainders are NOT certified California guideline net disposable income figures. They simply subtract your entered deductions from your converted monthly gross income.
✅ Use Verified Guideline Net Income
Once you have obtained appropriate California guideline net disposable income figures, enter them here to transfer them into the main Child Support Calculator.
⚖️ California Income Guidelines
California Family Code Sections 4058 and 4059 establish rules for gross income and net disposable income.
For self-employment, variable income, unusual tax circumstances, or disputed deductions, additional review may be necessary.
Open Official California Calculator →🔒 This worksheet does not request names, Social Security numbers, employer information, or case numbers.
🖨️ Printable Child Support Planning Summary Generate a printable report of your financial assumptions and estimated child support results.
📋 Prepare Your Child Support Summary
Create a printable planning worksheet using the information entered into your California Child Support Calculator.
The summary includes the basic-formula estimate, entered income assumptions, parenting-time percentages, and additional expenses.
This report contains financial information. Print or save it only on a device you trust.
This is an unofficial educational planning estimate, not a certified California child support calculation, legal advice, or a court document.
California Child Support Planning Summary
MyCruncher.com
Prepared: —
This summary does not determine a court-ordered child support amount. All figures depend on the accuracy and completeness of the information entered by the user.
1. Calculation Assumptions
| State | California |
|---|---|
| Number of Children | — |
| Parent A Monthly Guideline Net Income | — |
| Parent B Monthly Guideline Net Income | — |
| Parent A Parenting Time | — |
| Parent B Parenting Time | — |
2. Basic-Formula Child Support Estimate
—
This amount is an educational basic-formula estimate before applicable adjustments, add-ons, and other legal considerations.
3. Additional Expense Planning
| Monthly Work-Related Childcare | — |
|---|---|
| Monthly Uninsured Child Healthcare | — |
| Total Additional Expenses Entered | — |
These expenses are listed separately and have not been automatically added to the basic-formula support amount. Actual court-ordered allocations may differ.
4. Adjustments and Limitations
The estimate may require additional adjustments and official verification.
Differences in tax liabilities, allowable deductions, parenting schedules, health insurance, additional expenses, and other legal requirements may materially change the support amount.
Low-income adjustments may apply in qualifying cases and are not automatically included in this simplified planning estimate.
5. Before Using the Official Calculator
- Confirm both parents' California guideline net disposable income figures.
- Review parenting-time responsibility and schedules.
- Verify childcare, insurance, and uninsured healthcare expenses.
- Review applicable deductions, low-income adjustments, and other special circumstances.
- Compare this planning estimate with California's certified guideline calculation.
🔗 Share This Calculator
Share this free California Child Support Calculator, copy its link, or share your estimated results with someone you trust.
🔒 Confirm Before Sharing Financial Information
Your Share Result link will contain the values entered into the Child Support Calculator, including:
- Both parents' monthly net incomes
- Number of children
- Parenting-time percentage
- Entered childcare expenses
- Entered uninsured medical expenses
Anyone receiving this link can view the included financial figures. The link may also be retained in browser history, messages, or services used to share it.
If you only want to share the calculator without financial details, use Share Calculator or Copy Link.
Your Favorites and Recently Used lists save only the calculator name and page address in your browser — not the financial inputs or calculated amounts.
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About the Creator
MyCruncher — Founded by Bobby Dues
MyCruncher provides free online calculators designed to make everyday calculations easier to understand and use.
Meet Bobby Dues →California Child Support Calculator: How Child Support Is Estimated
Understanding California child support can be complicated. Both parents' incomes, parenting-time arrangements, the number of children, and certain additional expenses may influence the amount of support.
MyCruncher's free California Child Support Calculator provides an educational starting point for exploring the state's basic child support formula.
You can estimate basic monthly support, compare parenting-time scenarios, organize income information, and print a planning summary before using California's official calculator.
How to Use the California Child Support Calculator
- Select the number of children. Choose the number of children covered by the calculation between the two parents.
- Enter both parents' monthly guideline net disposable incomes. These figures may differ from gross wages or ordinary paycheck take-home pay.
- Enter Parent A's parenting time. Use the percentage of time that parent has primary physical responsibility for the children.
- Enter optional child expenses. Include estimated work-related childcare and uninsured healthcare costs for separate budget planning.
- Click Calculate Child Support Estimate. Review the illustrative basic-formula result and any adjustment warnings.
- Explore the additional tools. Compare scenarios, estimate parenting time, organize monthly income, or print a planning summary.
💡 Tip: The Reset button clears the main calculator inputs and hides the previous support results.
How Is Child Support Calculated in California?
California uses a statewide guideline established under Family Code Section 4055.
Unlike a simple flat percentage of one parent's paycheck, the basic formula considers both parents' guideline net disposable incomes and the higher earner's share of parenting time.
Basic child support amount before applicable adjustments and additional allocations.
Income allocation factor, determined using combined guideline net income and parenting time.
Higher earner's monthly guideline net disposable income.
Higher earner's approximate percentage of primary physical responsibility for the children.
Combined monthly guideline net disposable income of both parents.
In addition, California applies statutory multipliers when calculating basic support for more than one child. Depending on the circumstances, the result may also require adjustments and add-ons.
California's guideline formula was updated effective September 1, 2024. The basic formula alone does not reproduce every determination made by certified guideline software.
California Child Support Calculation Example
Consider a hypothetical family with one child and the following assumed guideline net incomes.
Combined monthly guideline net income is $8,500. For this illustration, the statutory K factor is 0.325.
This is an example of the basic statutory formula, not a certified child support determination. The actual guideline amount may differ because of deductions, add-ons, adjustments, and other case-specific information.
What Income Counts Toward California Child Support?
Income is one of the most important factors in child support calculations.
Under California Family Code Sections 4058 and 4059, guideline net disposable income is determined from legally relevant income and allowable deductions.
Gross Income May Include
- Wages and salaries
- Applicable overtime earnings
- Bonuses and commissions
- Self-employment income
- Certain investment or rental income
- Other income recognized under California law
Potentially Relevant Deductions
- Applicable federal and California income tax liabilities
- Required payroll contributions
- Certain mandatory retirement contributions
- Qualifying health insurance premiums
- Other deductions allowed under California Family Code Section 4059
However, not every deduction shown on a paycheck is allowable for child support purposes. For example, actual tax liability may differ from the amount withheld from a paycheck.
Use the Monthly Income Helper
MyCruncher's expandable Monthly Income Helper converts weekly, biweekly, twice-monthly, monthly, and annual earnings into monthly amounts.
It also provides a worksheet for organizing possible deductions. The preliminary worksheet remainder is not automatically a legally correct guideline net disposable income figure.
How Parenting Time Affects California Child Support
Parenting time can make an important difference in the basic guideline calculation.
California generally considers the percentage of time a parent has primary physical responsibility for the children.
The legally relevant percentage isn't necessarily the percentage of overnight stays. Daytime responsibility, school schedules, holidays, and other circumstances can matter.
Parenting Time Percentage Example
Suppose Parent A is responsible for the children for approximately 48 hours of a typical 168-hour week.
This is a planning approximation. Actual responsibility may vary during school breaks, vacations, holidays, or other arrangements.
Use the Parenting Time Helper
The expandable Parenting Time Percentage Helper lets you estimate percentages using weekly hours or annual overnights.
You can then transfer the approximate percentage into the main calculator without retyping it.
Compare Child Support With Different Parenting-Time Scenarios
What happens when you change the parenting-time percentage while keeping both parents' income assumptions the same?
MyCruncher's What-If Comparison lets you explore three scenarios side by side.
| Parent A Time | Illustrative Monthly Amount |
|---|---|
| 30% | $796 |
| 40% | $560 |
| 50% | $281 |
This example illustrates how the mathematical result changes when parenting time changes.
⚖️ These scenarios are not custody recommendations or guaranteed support amounts. Parenting arrangements should reflect the children's circumstances and applicable law.
Childcare, Healthcare, and Additional Child Support Expenses
Basic child support is not always the complete financial obligation.
California law addresses certain additional support expenses, including qualifying work-related childcare and reasonable uninsured healthcare costs.
Other expenses may be addressed depending on the circumstances and applicable court orders.
Potentially qualifying childcare expenses related to employment or other circumstances recognized under California law.
Reasonable medical or healthcare costs for children that are not covered by insurance.
For clarity, MyCruncher displays entered childcare and uninsured healthcare expenses separately from the basic-formula result. However, it does not determine how a court would allocate those expenses.
California Child Support Low-Income Adjustment
California provides a low-income adjustment mechanism for qualifying parents with limited ability to pay.
For 2026, the threshold is $2,929 per month in the paying parent's guideline net disposable income.
When the paying parent's income is below the applicable threshold, a presumptive adjustment may reduce the basic support amount. The presumption can be rebutted under applicable law.
MyCruncher identifies when its entered income suggests the low-income adjustment may apply, but it does not automatically calculate that adjustment.
Use California's certified Guideline Calculator to evaluate the applicable support calculation and any adjustment range.
The threshold is year-specific. Review the current California guideline before relying on a calculation in a later year.
Print and Compare Your Child Support Planning Results
The Printable Child Support Planning Summary creates a report based on the calculation you've completed.
It includes the income assumptions, number of children, parenting-time percentages, monthly and annual basic-formula amounts, and separately listed additional expenses.
You can print the summary or use your browser's Save as PDF option.
Financial Privacy When Sharing
Share Calculator and Copy Link provide the ordinary page URL without financial input values.
Share Result creates a link that can include the income figures and other calculation inputs. MyCruncher requires an explicit privacy confirmation before creating that link.
🔒 Anyone with a Share Result link may be able to read the included financial figures. Use fictional values for testing and share sensitive information carefully.
California Child Support Calculator FAQs
How is child support calculated in California?
California uses a statewide guideline formula that considers parental guideline net disposable income, parenting time, and the number of children. Other adjustments and expenses may also apply.
Is California child support based on gross income or net income?
The basic formula uses guideline net disposable income, determined under California law. This is not necessarily the same as gross earnings or take-home pay.
Does 50/50 custody mean no child support?
No. Equal parenting time does not automatically eliminate child support. Differences in parental income and other circumstances may still produce a support obligation.
Does California consider both parents' incomes?
Yes. Both parents' guideline net disposable incomes are relevant to the statewide basic child support formula.
Does child support increase for additional children?
The statutory formula includes child-count multipliers for multiple children. The final result may also depend on each family's circumstances.
Are bonuses and overtime included in child support?
Some bonuses, overtime, commissions, and other earnings may count as income under California law. Their treatment depends on the relevant circumstances.
Can childcare expenses affect a child support order?
Yes. Qualifying childcare and other expenses may be addressed through additional support provisions.
How do I calculate parenting time percentages?
Estimate the percentage of time a parent has primary physical responsibility for the children. Weekly hours can provide a planning starting point, but the legally relevant percentage depends on the circumstances.
Is MyCruncher's California Child Support Calculator official?
No. MyCruncher provides an unofficial educational estimator. California's certified Guideline Calculator should be used for more complete verification.
Can I change an existing child support order?
A parent may be able to request modification of an existing support order when applicable circumstances change. The court or local child support agency can provide information about the appropriate process.
Can I print my child support estimate?
Yes. MyCruncher's Printable Planning Summary organizes the entered assumptions and basic-formula result for personal financial planning.
Where can I get help understanding California child support?
California Courts offers child support self-help resources, and Family Law Facilitators can provide information about court processes and guideline support calculations.
Official California Child Support Resources
Use these resources when you need to verify a support estimate or understand the legal process.
MyCruncher.com is not a law firm or government child support agency. This calculator and guide are provided for general education and financial planning only.
Results may differ materially from California's certified guideline calculations, negotiated agreements, and court orders. Laws, thresholds, and individual financial circumstances can change.
For case-specific guidance, consult a qualified family-law professional, California's official calculator, or a Family Law Facilitator.