Child support rules are public law, but the math behind them is hard to find and easy to get wrong. SupportDecode runs the real state formulas and shows its work — every rate, cap, and table links to an official source with effective and last-checked dates. It is a free child-support calculator covering all 50 US states plus Washington DC, plus custody-schedule tools, expense-split calculators, and guides for parents, including single parents. What it does: enter income, custody time, and expenses, and SupportDecode calculates an estimated child support amount using the formula for your state. It explains each step, so parents can check the result, understand what changed it, and prepare for a conversation with a lawyer, mediator, or court. Who it is for: parents planning separation or divorce, single parents checking a payment, co-parents agreeing a fair split, and anyone who wants a clear, source-backed estimate before paying for advice. Key features include calculators for all 50 states and Washington DC, custody schedules, expense splitting, and plain-language guides that explain terms such as income shares, percentage-of-income models, and adjustments. Pricing and access: free to use online, with no account needed to run a calculation. SupportDecode is not legal advice; it is a transparent educational tool that helps families understand the numbers behind child support.
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