Simple tools, honest maths
Adnan Tools is a free library of calculators built for people who want a quick answer and want to understand it.
I started iamadnan.site because most calculator websites are slow, full of pop-ups and never explain where their numbers come from. I wanted the opposite: a page that loads instantly, gives the answer straight away and then shows the formula and a worked example.
Every tool here is checked against the standard formula used by banks, doctors or universities, and each page lists that formula so you can verify it yourself.
What you can expect
New tools every week, starting with finance, health and study calculators. Each one works on a cheap phone with a slow connection, and none of them asks you to sign up.
Contact
Suggest a tool, report a mistake or ask a question by email.
Fast first
Pages are plain HTML with no heavy frameworks, so they open in under a second.
Show the working
Every result comes with the formula, a chart and examples.
Your data stays yours
Calculations run in your browser. Nothing you type is sent to a server.
Always free
The site is supported by a small number of ads that never cover the results.