The New Classroom Standard With High-resolution LCD Technology

ClassWiz has intuitive operability and high performance functions, so ideal for education.


  • GCSE/AS/A LevelGCSE/AS/A Level
  • Number of Functions : 552Number of Functions : 552
  • Natural textbook displayNatural textbook display
  • Solar & BatterySolar & Battery


SKU: FX-991EX Category: Tag:
  • Description
  • Casio Centre


High-resolution LCD

The new ClassWiz features a high-resolution display
– making it easier to view numerical formulas and symbols.

■New Icon display

ClassWiz Series
*The photo shows the fx-991EX

ES PLUS Series

    • ■Innovative input method

    • ■List display

    The new ClassWiz makes it possible to display on the screen twice the number of characters in normal size and six times the number in small size compared with previous models.

    High-resolution LCD drives further evolution!

    Higher resolution increases the amount of information that can be displayed and improves usability. In addition, ClassWiz is equipped with a basic spreadsheet function for creating spreadsheets with up to 5 columns and 45 rows (maximum of 170 data items).

    ClassWiz technology has the power to change mathematics classroom


Superb usability that takes full advantage of the improved display capabilities makes the interface easy to use in classrooms

■Intuitive icon display

The use of icons on the menu screen improves viewability.
Selection of the desired function is quick and easy.

ClassWiz Series
*The photo shows the fx-991EX

ES PLUS Series

■Unabbreviated English display

Nearly all English words are displayed on the screen in unabbreviated form.

ClassWiz Series
*Messages are spelled out (not abbreviated)

ES PLUS Series

 ■Interactive format

Interactive menu display realizes more intuitive operation.

  • ■Natural Textbook Display

    Input and display fractions, powers, logarithms, roots, and other mathematical formulas and symbols just as they appear in textbooks.

MS Series

Newly designed body for the best use of calculation

Featuring intelligent design and an elegant texture

Comes with slide-on hard case
  • Special surface processing

    A special surface process applied to the body results in an elegant texture and design.

  • Metallic keys
    (fx-991EX/570EX only)

    The stylish look and feel of metal imparts a sense of luxury.

  • Key functions arranged by color

    The functions assigned to keys are color-coded to facilitate key operation.

  • Easy-to-understand key notation

    The key notation, like the display format, uses signs and symbols like those found in mathematics textbooks. This natural interface makes input fast and easy.

  • Thin rounded body

    The thin, smoothly rounded body fits the hand perfectly.


A High-performance processor and twice the memory of previous models
ensure speedy operation and superior computational power.

High performance effective for education

  • ■High-resolution display

    192 × 63-dot display.
    Clear display of equations and messages

  • ■High-speed calculation

    Fast calculation for smooth performance in class or during examinations

  • ■Data capacity for Statistics

    Capacity to process 160 statistical data items

  • ■High-performance functions

    • Use of spreadsheets
    • 4 × 4 matrix calculation

List display function for thorough, speedy learning

Variables and statistical calculation results stored in memory can be displayed in lists. There’s no need to recall and confirm individual values as with previous models.

High computational competence for performing even advanced mathematics

ClassWiz contains calculation functions that support even advanced mathematical operations, including spreadsheet calculations, 4 X 4 matrix calculations, calculation of simultaneous equations with four unknowns and quartic equations, and advanced statistical distribution calculations.

Effective learning for
Advanced Mathematics

Even advanced mathematical calculations are simple to perform and
functions that take advantage of previous unavailable display capabilities
are now possible

  • ■Spreadsheet calculations


    The spreadsheet function can be used for studying statistics which has become important in mathematics classes


    In addition, the spreadsheet function makes it possible to enter recursive formulas

    Riemann Integral

    Calculation using advanced Riemann functions is also possible

    The spreadsheet function makes it easy to use real-world data even in the classroom, enabling students to effectively study statistical processing

  • ■Advanced statistical distribution calculations

    This function makes it possible to perform several different types of distribution calculations such as binomial probability.

    Binomial probability

  • ■Matrix calculations

    This function makes it possible to perform matrix calculations of up to 4 rows by 4 columns.

    4×4 Matrix calculation

    • ■Other newly realized calculations

      ClassWiz supports other advanced mathematical operations including

      • Simultaneous linear equations in 2 to 4 unknowns
      • High-degree equations of second to fourth degree
      • Second-degree to fourth-degree inequalities

    Online Visualization
    Service Using QR Code

    The input formula and data are converted into a QR Code matching the settings on the calculator, then displayed on the calculator screen.
    Display numerical formulas and graphs and use them in study by reading QR Codes with an application on a smartphone, tablet, or other similar device. (fx-991EX/570EX only)

    Convert the numerical formula into a QR Code!
    • Visualization with graphs
      • Input formula
      • Table
      • QR Code
      • Display Graph

      Makes formulas visually understandable

    • Easy formula input
      • Input formula
      • Calculation Result
      • QR Code
      • Display formula

      Promotes fast, efficient report writing

    • Quick user manual call-up
      • Display the menu
      • QR Code
      • Display the manual

      Makes learning to operate the calculator fast and easy

      A comprehensive set of advanced functions unique to CASIO scientific calculators

      • Spreadsheet calculations

        Useful for learning statistics. Up to 5 columns × 45 rows (maximum of 170 data items)

      • Matrix calculations

        Perform calculations with matrices of up to 4 rows and 4 columns.

      • Vector calculations

        Perform calculations using up to four third-order vectors stored in memory.

      • Multiline display

        Formulas are automatically wrapped to multiple lines.* *In linear input mode

      • Integration calculations

        Perform integration calculations in advanced mathematics.

      • Differential calculations

        Perform differential calculations in advanced mathematics.

      • Equation calculations

        Calculation of simultaneous equations in 2 to 4 unknowns and high-degree equations of second to fourth degree

      • Inequality calculations

        Solve second-degree to fourth-degree inequalities.

      • Advanced statistical distribution calculations

        Perform calculations involving normal distributions, binomial distributions, and Poisson distributions.

      • Ratio calculations

        Perform ratio calculations such as A:B=X:D.

      • Metric conversions

        Select units from the Metric Conversion Command List.

      • Scientific constants

        Select scientific constants from the Scientific Constant Table.

      • Variables list

        One-touch list display

      • Statistics list

        Displays six rows at once.

      • Digit separator

        Separation every three digits makes even large numbers easy to read.

      • Engineering symbols

        Perform engineering calculations that include symbols such as k, M, m, and n.

      Main functions

      • Variables list
      • Prime factorization
      • Random integers
      • Coordinate transformation
      • Power calculation
      • Trigonometry
      • Fraction calculations
      • Combination and permutation
      • 9 variables
      • Statistics (List-based STAT data editor, Standard deviation, regression analysis, Statistics list)
      • Table function
      • UNDO
      • Digit separator
      • Multiline display

      Additional functions

      • Spreadsheet calculations
      • Integration calculations
      • Differential calculations
      • CALC function
      • SOLVE function
      • Complex number calculations
      • Base-n calculation
      • Equation calculations
      • Matrix calculations
      • Vector calculations
      • Scientific constants
      • Metric conversions
      • Advanced statistical distribution calculations
      • Inequality calculations
      • Ratio calculations
      • QR Code
      • Engineering symbol calculations