Introducing the Scientific Calculator — Trig, Logs, and Powers in Your Browser

Sometimes the four-function calculator on your phone just isn’t enough. The moment a problem involves a sine, a logarithm, or something raised to a power, you need a proper scientific calculator. Today we’re launching one that runs entirely in your browser: the Scientific Calculator.

What it does

Instead of pressing one operation at a time, you type a whole expression — sin(45) + sqrt(2) * 3 — and press equals. The calculator evaluates it with the correct order of operations: parentheses first, then powers, then multiplication and division, then addition and subtraction. Powers are right-associative the way maths textbooks define them, so 2^3^2 correctly returns 512.

The function set covers the essentials: sin, cos, tan and their inverses; natural log ln and base-10 log; sqrt, exp, abs, factorials with !, modulo with %, and the constants π and e. A DEG/RAD toggle controls how trig functions read their input, so your answers always match the context you’re working in.

Why we built it

Most free online calculators either evaluate things one keystroke at a time — losing track of precedence — or quietly use the browser’s eval, which is both a security risk and a source of surprising bugs. We wanted something that parses your expression properly, returns the same answer every time, and fails loudly with a clear message when you type something malformed like a stray operator or unbalanced brackets.

If you want to understand the functions themselves — what DEG vs RAD really means, why 2^3^2 is 512, or how logarithms work — our complete guide to using a scientific calculator walks through all of it with worked examples.

Pairs well with

For everyday percentages, the Percentage Calculator is faster, and when you need to convert between units, reach for the Unit Converter. The scientific calculator is the one to open when the maths gets genuinely advanced.

Try it

It’s free, runs in your browser, stores nothing, and supports full keyboard input. Open the Scientific Calculator and run your first expression.