More Than Your Phone’s Calculator
Your phone’s built-in calculator does addition and multiplication fine. But the moment you need sin(45°), or log(2500), or you want to confirm that 2^16 is actually 65536 before committing it to your code, you’re reaching for something better.
This calculator handles trig functions (sin, cos, tan), logarithms (log for base 10, ln for natural), square roots, exponents via the ^ operator, factorials with !, and the constants pi and e. Type expressions directly or use the buttons. It keeps a history of your previous calculations so you can click any result to pull it back in.
Try These
sin(3.14159)→ approximately 0 (sin of pi)sqrt(144)→ 122^10→ 1024 (useful when you’re thinking in powers of two)5!→ 120 (the number of ways to arrange five items)log(1000)→ 3 (because 10³ = 1000)ln(e)→ 1
You can nest functions, use parentheses freely, and mix operations. The parser handles operator precedence correctly, multiplication before addition, exponents before multiplication, parentheses override everything. It follows standard math rules, not left-to-right evaluation.
A Note on Security
A lot of online calculators use JavaScript’s eval() to process expressions, which is a security risk. This one doesn’t. It uses a recursive descent parser that evaluates expressions safely and predictably. You won’t notice the difference in results, but your browser will appreciate it.
Who Uses This
Students burning through physics problem sets where every other equation has a trig function or a natural log. Engineers doing back-of-envelope sanity checks. Programmers verifying that their bit-shift math is correct. Anyone who needs something between a pocket calculator and Wolfram Alpha.
The expression history is genuinely useful when you’re working through a multi-step calculation, click a previous result instead of retyping it.
For binary arithmetic and bitwise operations, the Binary Calculator is purpose-built. For solving full equations (linear, quadratic, 2x2 systems), the Equation Solver is faster. The Percentage Calculator covers the everyday stuff.
Works on any modern browser, Chrome, Firefox, Safari, Edge, across desktop, tablet, and mobile. Everything runs locally.