NCalc app icon

NCalc for iPhone, iPad & Mac

Scientific Calculator Plus 991

A natural-display scientific calculator, advanced math tools, a full graphing module, a large formula library and a unit & currency converter — designed for students, engineers and anyone who loves math.

  • Free download
  • In-app purchases
  • iOS 15 or later
Scientific Calculator — powerful, reliable, scientific: a calculator showing a natural-display integral Equation Solver — solve any equation in a second: a graph and a solved cubic equation

Features

Everything a scientific calculator does — and a lot more.

The familiar keys of a classic scientific calculator, with math tools that go far beyond it.

Algebra Calculation on iPad: a natural-display expression with fractions, roots, logarithms and an integral

Natural display, just like your textbook

Enter fractions, roots, exponents and more exactly as they appear in print — and see results written the way you would on paper.

  • Keyboard layouts that match the 115 ES Plus, 991 ES Plus, 300 ES Plus and 991 EX
  • Exact fractions in symbolic mode, or numeric evaluation when you need it
  • Arbitrary-precision integers — work with huge numbers without losing accuracy
  • Degree, radian and gradian modes, calculation history, copy and paste
Algebra Calculation: equations, integrals, derivatives and matrices in natural display Equation Solver in the dark theme, solving x to the fourth minus 9 equals 0

Solve any equation in a second

A general equation solver plus dedicated solvers for quadratic, cubic and quartic equations — no matter how complex the equation is.

  • Systems of equations with 2, 3 or 4 variables
  • Quadratic, cubic and quartic inequalities with interval-based solutions
  • Expansion, factorization and simplification of expressions
Graphing Calculator on iPad plotting several trigonometric curves

Graphing, as on an 83/84 calculator

Plot function, polar and parametric graphs, then find intersections, roots and critical points right on the curve.

  • Cartesian functions, implicit plots, polar and parametric graphs
  • Trace to find roots, intersections and extrema
  • Evaluate derivatives and integrals directly on the graph
Calculation details: a result explained with the equation solver and a graph Alternative forms: one result shown as a mixed fraction, in degrees-minutes-seconds, as a prime factorization and as a continued fraction

Every answer, in the form you need

Calculation details explain math concepts in a visual way, with the equation solver, graph and simplification one tap away.

  • Fraction, mixed fraction, decimal, repeating decimal, DMS and polar results
  • Alternative forms including prime factorization and Roman numerals
  • Normal, engineering, engineering SI, scientific and fixed number formats

And much more

A complete math toolkit in your pocket.

Algebra & calculus

Expand, factor and simplify expressions. Derivatives, integrals and limits.

Complex numbers

Arithmetic, polar and rectangular conversion, exponentials, logarithms, powers, roots and full trigonometry.

Matrices & vectors

Add, subtract and multiply, plus determinant, inverse, transpose, rank, eigenvalues and eigenvectors.

Statistics & distributions

Descriptive statistics and regression with a plotter. Normal, binomial, Poisson, t, chi-square and F distributions.

Base-N

Switch between binary, octal, decimal and hexadecimal, with arithmetic in each base.

Tables & custom functions

Generate value tables for any expression and range, and define your own functions.

Variables & constants

Store values and reuse them across calculations, with a rich set of math and physical constants.

Formula library

Math and physics formulas, clearly categorized for secondary school, high school and university.

Unit & currency converter

More than 1,000 unit conversions, plus a currency converter.

Screenshots

Take a closer look

iPhone

  • Scientific Calculator — powerful, reliable, scientific
  • Equation Solver — solve any equation in a second
  • Algebra Calculation — equation solver, integrals, derivatives, limits, complex numbers, statistics, matrices and vectors
  • Graphing Calculator — function, polar and parametric graphs; intersections, roots and critical points
  • Calculation details — explains math concepts in a visual way
  • Alternative Forms — decimal, fraction, mixed fraction, DMS, polar, prime factor and Roman numeral
  • Equation Solver — solve any equation, no matter how complex it is
  • Built-in manual — examples included

iPad

  • Scientific Calculator on iPad
  • Algebra Calculation on iPad
  • Graphing Calculator on iPad

Mac

  • NCalc on Mac in the light theme with the extended keyboard and result format panel
  • NCalc on Mac in the dark theme with the extended keyboard and result format panel
  • NCalc on Mac in the dark theme
  • NCalc on Mac in the light theme

Help

Learn it fast. Get help when you need it.

Get NCalc for free

Download Scientific Calculator Plus 991 on the App Store for iPhone, iPad and Mac.

Download on the App Store

Requires iOS 15, iPadOS 15 or macOS 12 or later. Offers in-app purchases.