Child Support Calculator
All 50 States, 2026

Free estimates using each state's official formula. Calculator, modification checker, arrears calculator, and 50/50 custody guide — no signup required.

50
States covered
4
Tools per state
250+
Dedicated pages
2026
Last updated

What would you like to calculate?

Detecting your state…

📊
Child Support Calculator
Estimate monthly payments using your state's official formula
📝
Modification Checker
Does your income change qualify for a modification?
💰
Arrears Calculator
Calculate past-due support with interest by state
⚖️
50/50 Custody Guide
Does equal custody eliminate child support?

Browse by State

Select your state to see all child support tools and rules.

Alabama
Income Shares
Ends age 19
Alaska
Percentage of Income
Ends age 18
Arizona
Income Shares
Ends age 18
Arkansas
Percentage of Income
Ends age 18
California
Income Shares
Ends age 18
Colorado
Income Shares
Ends age 19
Connecticut
Income Shares
Ends age 18
Delaware
Melson Formula
Ends age 18
Florida
Income Shares
Ends age 18
Georgia
Income Shares
Ends age 18
Hawaii
Melson Formula
Ends age 18
Idaho
Percentage of Income
Ends age 18
Illinois
Income Shares
Ends age 18
Indiana
Income Shares
Ends age 19
Iowa
Percentage of Income
Ends age 18
Kansas
Income Shares
Ends age 18
Kentucky
Income Shares
Ends age 18
Louisiana
Income Shares
Ends age 18
Maine
Income Shares
Ends age 18
Maryland
Income Shares
Ends age 18
Massachusetts
Income Shares
Ends age 18
Michigan
Income Shares
Ends age 18
Minnesota
Income Shares
Ends age 18
Mississippi
Percentage of Income
Ends age 21
Missouri
Income Shares
Ends age 18
Montana
Melson Formula
Ends age 18
Nebraska
Income Shares
Ends age 19
Nevada
Percentage of Income
Ends age 18
New Hampshire
Income Shares
Ends age 18
New Jersey
Income Shares
Ends age 19
New Mexico
Income Shares
Ends age 18
New York
Percentage of Income
Ends age 21
North Carolina
Income Shares
Ends age 18
North Dakota
Income Shares
Ends age 18
Ohio
Income Shares
Ends age 18
Oklahoma
Income Shares
Ends age 18
Oregon
Income Shares
Ends age 18
Pennsylvania
Income Shares
Ends age 18
Rhode Island
Income Shares
Ends age 18
South Carolina
Income Shares
Ends age 18
South Dakota
Percentage of Income
Ends age 18
Tennessee
Income Shares
Ends age 18
Texas
Percentage of Income
Ends age 18
Utah
Income Shares
Ends age 18
Vermont
Income Shares
Ends age 18
Virginia
Income Shares
Ends age 18
Washington
Income Shares
Ends age 18
West Virginia
Income Shares
Ends age 18
Wisconsin
Percentage of Income
Ends age 18
Wyoming
Income Shares
Ends age 18