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Calculator Castle
242 free calculators, no signup, answer in one screen
I built this because every calculator site I landed on gave me the
same experience: the answer buried under three ad blocks, a cookie
wall, and a prompt to sign up before it would show me the result.
242 calculators now. The ones I like best are the boring specific
ones — Army body fat, GFR, Weight Watchers points, voltage drop,
stair rise and run. Things where people currently open a PDF chart
or a forum post from 2011.
Most of them show their working rather than just a number. The
mortgage one gives the full amortisation table. The BMI one uses
the CDC percentile charts for children instead of pretending the
adult formula applies to a 7 year old.
Nine of them embed on your own site with one line of HTML, if you
run something where a working calculator would help.
It went up recently and I am still filling gaps, so the useful
thing you can tell me is which calculator you came looking for and
could not find. That is what I build next.
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About Calculator Castle on Product Hunt
“242 free calculators, no signup, answer in one screen”
Calculator Castle was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #104 on the daily leaderboard. 242 free online calculators for money, health, math, and everyday life. No account, no clutter, and most show the formula.
Calculator Castle was featured in Health & Fitness (83.2k followers), Education (79.1k followers) and Finance (6.2k followers) on Product Hunt. Together, these topics include over 68.9k products, making this a competitive space to launch in.
Who hunted Calculator Castle ?
Calculator Castle was hunted by Syed Rupom. 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.
Want to see how Calculator Castle stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
Syed Rupom