Scientific Calculator Plus 991

Natural display: Enter expressions exactly as in textbooks—fractions, roots, exponents, and more—see results as written on paper.

Keyboard layout: Matches popular models for familiarity and speed: 115 ES Plus, 991 ES Plus, 300 ES Plus, and 991 EX.

Symbolic and numeric modes: Perform exact fraction calculation or evaluate numerically when needed.

Arbitrary precision integers: Work with very large integers without losing accuracy.

Output types: Choose from fraction, mixed fraction, decimal, repeating decimal, degrees/minutes/seconds, and polar coordinates.

Angle units: Degree, radian, and gradian (grade).

Decimal formatter: Display numbers in normal, engineering, engineering SI, scientific, or fixed formats.

Calculation history: Review and reuse past calculations with ease.

Copy and paste support for fast data entry and sharing.

Algebra calculation: Expansion, factorization, simplification, and more.

Calculus calculator: Derivatives, integrals, and limits of expressions.

Complex number calculation: Arithmetic, polar/rectangular conversion, exponential, logarithm, powers, roots, and full trigonometric functions.

Equation solver: Solve general equations, plus dedicated solvers for quadratic, cubic, and quartic equations.

System of equations solver: Solve systems with 2, 3, or 4 variables.

Inequality solvers: Quadratic, cubic, and quartic inequalities with interval-based solutions.

Operations: Addition, subtraction, multiplication for matrices and vectors.

Advanced tools: Determinant, inverse, transpose, rank, eigenvalues, and eigenvectors.

Statistical calculation: Descriptive stats and regression calculation (including a regression plotter).

Distribution calculation: Normal distribution, binomial distribution, Poisson distribution, t-distribution, chi-square distribution, and F-distribution.

Base N calculation: Effortlessly switch between binary, octal, decimal, and hexadecimal, with arithmetic in each base.

Table Generator: Generate value tables based on any expression and range.

Calculator variables: Store values and reuse them across calculations.

User-defined functions: Create your own functions to streamline repetitive work.

Built-in constants: A rich set of mathematical and physical constants.

Extensive formula collection: Math and Physics formulas, clearly categorized—ideal for secondary school, high school, and university students.

Currency Converter

1000+ unit conversions

Cartesian functions, implicit plots, polar, and parametric.

Tracing, roots, intersections, extrema, derivative, and integral evaluations on graphs.

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