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CalcBadger
Free embeddable calculators with unit-tested formulas
CalcBadger is a growing set of free online calculators and unit converters. Every formula is unit-tested against a named authoritative source (state DOT specs, NIST, USPS), each calculator shows its formula and the worked steps, and every page cites where its constants come from. Any tool can be embedded on your own site with one line of HTML, with a small credit link at the bottom. No signup, no ads inside the tools.
Hi Product Hunt, I'm Owen and I build CalcBadger. It started because most online calculators hide the formula and cite nothing, so you can't tell whether the number is right. Every CalcBadger tool shows the formula and the worked steps, cites the source its constants come from (state DOT specs, NIST, USPS and so on), and its formulas are unit-tested, so a wrong edge case fails a build before it ever reaches you. Each calculator also has an embed version you can drop into a blog post or a school resources page with one line of HTML. No signup, no ads inside the tools. I'd like to hear which calculators you'd want added next, and whether the embed works on your site.
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About CalcBadger on Product Hunt
“Free embeddable calculators with unit-tested formulas”
CalcBadger was submitted on Product Hunt and earned 3 upvotes and 1 comments, placing #83 on the daily leaderboard. CalcBadger is a growing set of free online calculators and unit converters. Every formula is unit-tested against a named authoritative source (state DOT specs, NIST, USPS), each calculator shows its formula and the worked steps, and every page cites where its constants come from. Any tool can be embedded on your own site with one line of HTML, with a small credit link at the bottom. No signup, no ads inside the tools.
CalcBadger was featured in Productivity (661.2k followers) and Education (79.2k followers) on Product Hunt. Together, these topics include over 196k products, making this a competitive space to launch in.
Who hunted CalcBadger?
CalcBadger was hunted by owen zhang. 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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owen zhang