Quick utilities every student reaches for: a fast unit & measurement converter, a number-system converter for binary, octal, decimal and hexadecimal, and a handy reference of SI prefixes and physical constants. Everything runs right in your browser — free, no sign-up, and it keeps working offline.
🎁 100% free · no sign-up · works offline.
Computer-science students can convert between binary, octal, decimal and hexadecimal in one place, with every base shown side by side. There is also a reference card of SI prefixes (kilo, centi, milli, micro and the rest) and common physical constants such as the speed of light, standard gravity and Avogadro’s number — the things you keep looking up mid-problem. Need the working explained too? Try the full AI maths tutor and science tutor.
Free study tools for students. No ads, no sign-up, works offline.
🧮 Open Study Tools →