About This Item

The Casio fx-991ES PLUS-2 is a powerful scientific calculator designed for students, teachers, engineers, and professionals who require advanced mathematical capabilities in a reliable and easy-to-use device. Featuring 417 built-in functions and Casio's Natural Textbook Display, mathematical expressions appear exactly as they do in textbooks, making calculations easier to understand and reducing input errors.

Designed for advanced education, it supports complex calculations including matrices, vectors, integration, differentiation, simultaneous equations, statistics, complex numbers, logarithms, trigonometry, base-n conversions, scientific constants, and engineering notation. The calculator also includes CALC and SOLVE functions, table generation, random integer generation, and support for nine variables, making it suitable for a wide range of STEM subjects.

Powered by both solar and battery, the fx-991ES PLUS-2 provides dependable performance in classrooms, laboratories, and professional environments. Its slim lightweight design, fast two-key rollover input, durable slide-on hard case, and long battery life make it an excellent everyday companion for mathematics, engineering, physics, chemistry, and examination use.

Our goal is for every customer to be totally satisfied with their purchase. If this isn't the case, let us know and we'll do our best to work with you to make it right.

3-Year Warranty

We will work quickly to ship your order as soon as possible. Once your order has been shipped, you will receive an email with further information. Delivery times vary depending on your location.

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Category	Specification
Product Features	Non Programmable, Non Graphing, Number of Functions: 417
Product Type	Non Programmable, Non Graphing
Digits	10 + 2 digits
Display Type	Natural textbook display, Dot matrix display
Key Material	Plastic keys
Key Functions	Fast-typing function (2-key rollover), Negative Sign, Power Off
Memory	Variables: 9, Independent Memory (M / M+ / M-), Answer Memory, Memory Protection, Reset Function
Power Supply	Solar & Battery
Battery Life	Approximate battery life: Main 3 years
Auto Power Off	Yes
Dimensions (D × W × H)	161.5 × 77 × 11.1 mm
Weight	95 g
Accessories	Hard Case
Display Settings	Number Format: Fix, Number Format: Sci, Number Format: Norm, Engineering Notation, Toggling Calculation Results
Basic Calculation Functions	Basic Calculation, Bracket Calculation, Fraction Calculation, Degree, Minute, Secound (Sexagesimal) Calculations, Reciprocal Calculation, Percent Calculation (scientific calculator function), Factorial Function, π, Calculation with √ and π, Rounding Function
Advanced Calculation Functions	Transcendental number: e, Base-n calculation, Logical Operators, Complex number calculation, Matrix calculations, Vector calculations, Differential calculation, Integration calculation
Applied Calculation Functions	Multi-statement Command (:), Continuous Calculation, Replay Function, Multi-replay Function, CALC Function, SOLVE Function
Basic Function Features	Basic Mathematical Functions, Number of Functions: 417, Absolute Value Calculation, Power Function (Square), Power Function (Cube), Power Function, Power Function (Square Root), Trigonometric Function, Inverse Trigonometric Function, Hyperbolic / Inverse Hyperbolic Function, Exponential Calculation, Logarithmic Calculation, Log not base 10, Coordinate Conversion, Combination / Permutation, Random Number Generation, Random Integer Generation, Summation
Other Functions	Equation, Physics- and chemistry-related functions, Scientific Constants, Metric conversion function
Statistical Functions	List based STAT-data editor, Statistical calculation, Statistics Function, Basic Statistics