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CalcTray
Fast, free calculators for money, math, and everyday life
CalcTray is a free library of online calculators for finance, health, math, and everyday decisions. Work out a mortgage payment, loan cost, or compound interest. Check your BMI, BMR, or GPA. Solve geometry. Every calculator runs in your browser with no signup and no download, and shows the steps behind the answer so you can check the math yourself. Prefill the inputs, share a link to your result, or embed a calculator on your own site. Fast on any phone, and ready the moment you land.
This started because I got fed up. Every time I googled something like "mortgage payoff" or "BMR calculator" I'd end up on some page that took moments to load and buried the actual calculator under a wall of ads. And even once it loaded, the layout was such a mess I'd have to hunt around for the one number I actually came for. Then it'd spit out a result with no idea how it got there.
So I made CalcTray. It's free, there's no signup, and the answer you want is right there up front, with the math behind it so you can actually check it. Loads fast too since it's just a static site, no tracking junk.
Right now there's around 50 of them (mortgage, loans, compound interest, BMI, BMR, GPA, a bunch of geometry ones) and I keep adding more every week. You can prefill the inputs and share a link to your result, which I use constantly. It also saves recent results for a quick cross-comparison.
Anyway, would love to know which calculator you actually use most. That's probably what I build next. And if something feels off or broken, tell me, I'd rather hear it.
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About CalcTray on Product Hunt
“Fast, free calculators for money, math, and everyday life”
CalcTray was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #71 on the daily leaderboard. CalcTray is a free library of online calculators for finance, health, math, and everyday decisions. Work out a mortgage payment, loan cost, or compound interest. Check your BMI, BMR, or GPA. Solve geometry. Every calculator runs in your browser with no signup and no download, and shows the steps behind the answer so you can check the math yourself. Prefill the inputs, share a link to your result, or embed a calculator on your own site. Fast on any phone, and ready the moment you land.
CalcTray was featured in Productivity (658.2k followers), Education (79k followers) and Finance (6.2k followers) on Product Hunt. Together, these topics include over 190k products, making this a competitive space to launch in.
Who hunted CalcTray?
CalcTray was hunted by Drew Budwin. 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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Drew Budwin