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Free · No signup · Available for all 50 U.S. states

Calculate. Estimate. Understand.

Free legal calculators for child support, overtime, alimony, and 24 more legal-related financial calculations — using publicly available rules and formulas from each U.S. state. Not legal advice. Just the math.

  • Formula-based calculations
  • State rules, not national averages
  • See exactly how each number is calculated
No signup requiredCites official statutesUpdated 2026

Child support hubAll U.S. states — find yours →

Child Support · California

Live estimate

California

Income Shares Model · Family Code § 4055

Est. monthly support

$1,625

Calculate for My State →

Estimate only · Based on: $6,500/$4,200 income, 2 children, 0 overnights (Income Shares illustration)

27 tools. All 50 states.

Select a calculator, pick your state, get your estimate.

TheLegalCalc uses state guideline models — not generic national averages — to generate planning estimates you can cross-check against official sources. Each tool documents its legal basis where available. Laws change; verify current rules for your state. No attorney required for a starting number.

Guides

How each calculation works.

Every calculator has a guide explaining the formula, the statute it uses, and when results may differ from a court calculation.

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How We Build Each Calculator

Every TheLegalCalc tool is built around a specific state statute or guideline model. We document the formula, the data sources, the assumptions, and the limitations of each calculation.

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Common questions answered.

Frequently asked questions

Yes, completely. TheLegalCalc is 100% free to use with no account, no signup, and no hidden fees. TheLegalCalc is free to use. We do not charge users for any calculator or guide.

Our calculators apply each state's guideline model — Income Shares, Percentage of Income, or Melson Formula — based on publicly available state statutes. Results are planning estimates. For a court-certified calculation, use your state's official calculator.

No. We do not store, collect, or transmit any of your inputs. Every calculation runs entirely in your browser. When you close the page, the data is gone.

Available for all 50 U.S. states. Each calculator applies the guideline model for your state — Income Shares, Percentage of Income, or the applicable civil rate — based on publicly available statutes. Results are planning estimates, not court calculations.

No. TheLegalCalc results are estimates for informational purposes only and do not constitute legal advice. Courts use more detailed financial information and judge discretion. Always work with a licensed attorney for actual legal proceedings.

Calculators and articles are reviewed when state law changes and at least annually. Confirmed errors are corrected within 2 business days of being reported. If you notice an error or a law has changed, please contact us.

TheLegalCalc provides general legal information for educational purposes only. Results are estimates and do not constitute legal advice. Laws change frequently and vary by jurisdiction. Always consult a licensed attorney in your state before making any legal decisions.

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