What it does

One mobile-first calculator covering the everyday jobs: quick arithmetic, a full scientific keypad, plotting a function, solving equations, and matrix maths — without installing an app or signing in.

The five modes

• Standard — a clean keypad for everyday sums, with a running history you can tap to reuse.
• Scientific — trigonometry (with a DEG/RAD toggle and inverse functions), natural & base-10 logs, powers and roots, factorial, π and e, and memory keys.
• Graph — type up to three y = f(x) and a range to plot static, colour-coded curves with axes and gridlines.
• Solve — linear and quadratic equations (real or complex roots, with discriminant and vertex), plus 2- and 3-unknown simultaneous systems.
• Matrix — determinant, inverse, transpose, and A+B / A−B / A×B for matrices up to 4×4.

How it computes

Expressions, graphs, simultaneous systems and matrix operations are evaluated by math.js, loaded only on this page and built as a trimmed instance with just the functions the calculator needs. Quadratics use the standard formula (complex roots when the discriminant is negative). Degrees are converted to radians for trig so sin(90°) = 1.

Private by design

Everything runs locally in your browser; your history and settings are saved only in this browser’s storage. Nothing you type is ever uploaded.