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Casio Classwiz FX 991EX Non Programmable Scientific Calculator

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Features overview

The ClassWiz series with high-resolution LCD and many other extras 

The Classwiz series offers a new high-resolution LC display with 192×63 pixels and a resolution that is four times higher than that of the familiar displays of the FX-ES Plus series. In addition, the new ClassWiz series boasts new hardware with a faster processor and double the memory size.

Functions & general information


There is also a spreadsheet which allows the user to perform basic spreadsheet calculations on a scientific calculator for the first time. In addition, results can be viewed on a smartphone or tablet thanks to the newly available QR code¹ function.

Detailled Specification:

  • High-resolution LC display with 192 x 63 pixels
  • Natural-V.P.A.M. – Natural display
  • 552 functions
  • Icon menu
  • Spreadsheet
  • QR code function¹
  • Solving equations and systems of up to four equations
  • 4X4 matrices
  • Vector calculations
  • Integration calculations
  • Differential calculations
  • Probability distribution
  • Calculation with technical symbols
  • Undo-Function
  • Complex number calculation
  • Base-N calculations
  • Equation calculations
  • Inequality calculation
  • SUM calculation
  • 47 wcientific constants
  • 40 metrixc conversions
  • Automatic parenthesis
  • 24 Parentheses level
  • Variable memory (9)
  • Trigonometric and invers trigonometric functions
  • Hyperbolic and invers hyperbolic functions
  • Power / Power Root calculations
  • logarithmic calculations
  • Exponential calculations
  • Root calculations
  • Combinatoric and Permutation
  • Prime factorization
  • Random Integer
  • Conversion of polar coordinates into rectangular coordinates and invers
  • Fraction (two modes)
  • Conversion of sexagesimal into decimal and invers
  • Calculates in Degree, Grad and Radian
  • SCI/FIX/ENG function
  • List based statistics
  • 1-variable statistics
  • Standard deviation
  • 2-variable statistics (Regressions)
  • Percentage calculation
  • Non-natural input
  • Output with √ form
  • Output with Π form
  • Function table

General specifications

  • 552 functions
  • Display: „Natural Textbook Display“ Natural V.P.A.M.
  • High-Resolution LC-Display, 63 x192 dots, 16/10 + 2 digits
  • Energy supply: Solar + Battery (1xLR44)
  • Comes with new slide-on hardcase
  • Dimensions (H x W x L): 77 x 165,5 x 11,1 mm
  • Weight: 90g


Casio was established in April 1946 by Tadao Kashio, an engineer specializing in fabrication technology. Kashio's first major product was the yubiwa pipe, a finger ring that would hold a cigarette, allowing the wearer to smoke the cigarette down to its nub while also leaving the wearer's hands free.

Today, Casio is best known for its wide range of digital cameras, its durable and fashionable watches and its array of electronic keyboards.

However, other loved Casio products include calculators, cash registers, illuminators, laptop and sub-notebook computers, mobile phones, PDAs, electronic dictionaries, Digital Diaries, computer printers, clocks, and portable televisions.