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About This Tool
Free Online Scientific Calculator
A powerful scientific calculator inspired by the Casio fx-991CW, packed with 540+ functions — all running directly in your browser with no downloads required.
Calculator Modes
- Calculate — Full scientific computation with trigonometric (sin, cos, tan), hyperbolic, inverse functions, logarithms (log, ln), powers, roots, factorial, permutations (nPr), combinations (nCr), and constants (π, e). Supports DEG/RAD/GRAD angle modes, SHIFT for inverse functions, and memory storage (MS/MR).
- Equation Solver — Solve linear systems (2×2, 3×3, 4×4), polynomial equations (quadratic, cubic, quartic), and general equations using Newton's method.
- Matrix — Matrix operations up to 4×4: determinant, inverse, transpose, addition, and multiplication.
- Complex Numbers — Arithmetic with complex numbers in rectangular (a + bi) form. Supports addition, subtraction, multiplication, division, magnitude, conjugate, polar conversion, and powers.
- Base-N — Convert between decimal, binary, octal, and hexadecimal. Includes logical operations: AND, OR, XOR, NOT, bit shifts.
- Statistics — Enter data sets and compute count, sum, mean, population and sample standard deviation, variance, min, max, median, quartiles, and range.
- Scientific Constants — 47 searchable physical constants including speed of light, Planck constant, Avogadro number, gravitational constant, and more. Click any constant to insert it into your calculation.
Key Features
- Full keyboard support — type numbers, operators, Enter, Escape, and Backspace
- Calculation history — scroll through past calculations and click to reuse
- Number formatting with comma separators
- Responsive design — works on desktop, tablet, and mobile
- 100% client-side — no data sent to any server