Refresh the page

Casio FX 991 EX

Special Offer
€23.30 without VAT

Casio FX 991 EX

A top-of-the-line scientific calculator, which will also be appreciated by high school and college students. It offers 552 mathematical functions that cover the whole school curriculum and more. The calculator features a 192 x 63 pixel multi-digit display. On top of that, the calculator has a new hardware with a faster processor and double the memory, when compared with a previous model. For the first time, the calculator is capable of performing basic spreadsheet calculations. You can view the results on your smartphone or tablet with the new QR code feature.

Key features

  • 552 mathematical functions
  • High-resolution display
  • The possibility of basic spreadsheet calculations
  • 40 metric conversions
  • 24 levels of automatic parentheses
  • Memory storing 9 variables 

Powered by both battery and solar panel

The undisputed advantage of the calculator is its dual power system. The calculator can work on the built-in battery, but also economically through the built-in solar panel. A solid sliding case is also included with the calculator.


  • 552 features
  • Trigonometric and inverse trigonometric functions
  • Hyperbolic and inverse hyperbolic functions
  • Exponential and nth root calculations
  • Logarithmic calculations
  • Exponential calculations
  • nth roots
  • Combinatorics and permutations
  • Convert polar coordinates to orthogonal and backwards
  • Fractions (two modes)
  • Convert from the base 60 system to the decimal and back
  • Calculates in degrees, gradients and radians
  • and many others...
69 customers rated
2 000+
customers have purchased
90 %
customers recommend
All ratings



Calculator type Scientific

Power supply

Type of power source Both solar and battery powered
Batteries CR44 / LR44 (Button cell)


Equipment Protective case, Automatic turn-off, QR-code generation
Keyboard type Platic
Mathematic function number 557 functions


Basic funtions Root
Science functions Trigonometric functions Sin, Cos, Tan, Cotg, Fractions, Logarithmic functions, Complex numbers, Derivatives and integrals, Calculations in DEC, BIN, OCT, HEX, PEN, Calculations with matrices and vectors, Solving linear equation systems, Numeric formulas, Graphic illustration, Statistics of two variables, Physical Constants, Table of function values, Natural-looking calculation display, Unit conversions


Display Dot
Code:  QS770y4
Warranty: 24 months
Product Number:  FX 991 EX
Links: Manufacturer's Website: