Scientific Calculator

By the FastFreeTools Editorial Team · Last reviewed: May 2026 · See our Editorial Policy for methodology, sourcing, and disclaimers.

Full-featured scientific calculator with sin, cos, tan, log, ln, sqrt, exponents, π, and e.

About this tool

A scientific calculator extends basic arithmetic with trigonometric functions (sin, cos, tan), logarithms (base-10 and natural), square roots, exponentiation, and mathematical constants (π and e). Our expression parser handles complex nested calculations with correct operator precedence (PEMDAS).

How to use Scientific Calculator

Click buttons or type expressions.
Use function buttons for advanced ops.
Use parentheses for complex expressions.
Press '=' to evaluate.

Tips & best practices

Trig functions use radians, not degrees.
'log' = base 10; 'ln' = natural log.
Press 'C' to clear.
Chain operations after results.

Common use cases

Solving physics equations.
Computing trig values.
Evaluating logarithmic expressions.
Quick scientific calculations.

Privacy

This tool runs entirely in your browser. We do not upload, store, log, or process your input on any server. Open your browser's DevTools Network tab to verify — there is no outbound request with your data. See our Privacy Policy for details.

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