Quick Child Support Calculator

Not legal advice. Use this 3-minute estimate to prep questions for your attorney or mediation.

Household inputs

Each state has unique formulas. This gives directional math using income share + parenting time approach.
Estimated support due $0
Enter details to begin.

Breakdown

Parent A Parent B
Monthly income$0$0
Income share %0%0%
Parenting time %0%0%
Adjusted obligation$0$0

Where does the formula come from?

It mirrors income-share models used by most U.S. states as of 2026: combined income × base percentage (based on # of kids) adjusted by parenting time.

Can I change tax filing or deductions?

Use gross monthly income before taxes. For more precision, talk to counsel about allowable deductions in your state.

What about college or medical extras?

Add them to the "extraordinary" line. The calculator splits them using the same income percentages.

Is this legally binding?

No. Judges, mediators, and state worksheets control the final number. This is purely for planning.

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Frequently Asked Questions

What is a custody calculator?

Parenting time is usually expressed as a percentage. 50/50 custody = each parent has 50%. 70/30 = one parent has the child 70% of overnight stays per year.

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