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CentsMath
15 free, honest finance calculators - no signup, no ads
CentsMath is a growing set of free US finance calculators for the money decisions people actually face - debt payoff, mortgage extra payments, Roth vs Traditional, HYSA vs CD vs Treasury, Coast FIRE, and more. Every tool shows its formula in plain English, cites the primary source (IRS, CFPB, TreasuryDirect), and has its math covered by automated tests. No signup, no paywall, and nothing you type ever leaves your browser.
Hi PH 👋 I'm Tanish, an indie dev, and I built CentsMath because I was tired of finance calculators that are black boxes - numbers in, verdict out, formula hidden - or that wall the good stuff behind a signup.
So I set three rules for every tool: show the formula in plain English, cite the primary source (IRS/CFPB/DOL/TreasuryDirect), and cover the math with automated tests before it ships. A few do things the big sites skip - the Roth vs Traditional one actually invests the tax savings and shows your break-even tax rate; the rent vs buy one will honestly tell you to keep renting when that's the better call.
It's all free, no signup, and nothing you enter leaves your browser. Would genuinely love feedback - especially if any number looks off, since accuracy reports get fixed first. Thanks for taking a look!
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About CentsMath on Product Hunt
“15 free, honest finance calculators - no signup, no ads”
CentsMath was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #144 on the daily leaderboard. CentsMath is a growing set of free US finance calculators for the money decisions people actually face - debt payoff, mortgage extra payments, Roth vs Traditional, HYSA vs CD vs Treasury, Coast FIRE, and more. Every tool shows its formula in plain English, cites the primary source (IRS, CFPB, TreasuryDirect), and has its math covered by automated tests. No signup, no paywall, and nothing you type ever leaves your browser.
CentsMath was featured in Fintech (47.4k followers), Investing (26.7k followers) and Personal Finance (2.9k followers) on Product Hunt. Together, these topics include over 31.8k products, making this a competitive space to launch in.
Who hunted CentsMath?
CentsMath was hunted by Tanish. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Tanish