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Calculator Castle
242 free calculators, no signup, answer in one screen
242 free online calculators for money, health, math, and everyday life. No account, no clutter, and most show the formula.
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.
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.
On the analytics side, Calculator Castle competes within Health & Fitness, Education and Finance — topics that collectively have 168.5k followers on Product Hunt. The dashboard above tracks how Calculator Castle performed against the three products that launched closest to it on the same day.
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.
For a complete overview of Calculator Castle including community comment highlights and product details, visit the product overview.
Syed Rupom