childsupport.app is a free, comprehensive tool designed to help parents estimate child support payments across all 50 US states and Washington, D.C.

Why We Built This

Navigating child support can be stressful and confusing. Every state has different guidelines, formulas, and factors. We built this calculator to give parents a quick, easy way to get a ballpark estimate of what child support might look like — without needing to hire an attorney just for a rough number.

All 50 States + DC

Every state's guidelines covered in one place

3 Calculation Models

Income Shares, Percentage of Income, and Melson Formula

100% Private

All calculations happen in your browser — nothing stored

What We Offer

Child Support Calculator — Estimate monthly payments based on your state's formula
Alimony Calculator — Estimate spousal support obligations
Modification Estimator — See how changes in income or custody affect support
Arrears Calculator — Calculate past-due support with interest
State-by-State Guides — Detailed breakdowns for each state's guidelines
Multi-Language Support — Available in English, Spanish, and Russian

Important Note

This tool provides estimates only. Actual child support is determined by courts and can vary based on many factors not captured here. Always consult a licensed family law attorney in your state for legal advice.