Ethan Zhang

Free US mortgage & tax calculators

About

Indie developer building simple, free financial calculators for US households — mortgage, tax, and retirement. I care about clarity over complexity. Currently building Calchorus.

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Calchorus

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Maker History

CalchorusFree financial calculators that show every step of the math
Oct 2026

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Joined Product HuntOctober 6th, 2026

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4h ago

Calchorus - Free financial calculators that show every step of the math

Calchorus is 19 free financial calculators for US taxpayers, freelancers, and homeowners — 1099 and self-employment tax, quarterly estimates, Roth IRA, mortgages, and debt payoff. Every tool shows the full breakdown, not just a final number: each line of the math, the 2026 brackets behind it, and why the result moves when you change an input. Mortgage tools pull the 30-year fixed rate weekly from FRED instead of a stale figure. No account, no email, no paywall — just your answer.