About

HuanLog Math Tools is a collection of free online calculators for linear algebra, calculus, statistics and number theory. It was built by a computational mathematics researcher who got tired of ad-stuffed calculator sites that are slow, wrong on edge cases, or demand an account before showing a single number.

Design principles

• Correct first. Gaussian elimination with partial pivoting, adaptive Simpson quadrature, Richardson extrapolation, bisection-refined roots — standard methods, tested edge cases.
• Private by construction. Every computation runs in JavaScript on your own device. The site is static files; there is no backend to send your numbers to. See the privacy page.
• Fast and light. No frameworks, no tracking scripts, no font downloads. Pages work offline once loaded and are fully usable on phones.

What's inside

Nine tools today: matrix calculator, linear system solver, function plotter, derivative calculator, numerical integration, quadratic equation solver, polynomial root finder, statistics calculator and a number theory toolkit — all sharing one tested math kernel (math.js).

Found a bug or want a tool? The site is a living project — more calculators are added regularly.