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CASIO FX-991MS-2 - C77

Scientific Calculator for Education with 40 Scientific ConstantsMrp 1,095  1,040(5% off)Inclusive of all taxes
10 + 2 digits
401 Functions
Sleek Design with curved edges which makes it compact & easy to carry.
Drop resistant body with water Resistant printing on Keys
40 Scientific Constants
Statistics (STAT-data editor, Standard deviation, Regression analysis)
Matrix & Vector Calculation
Comes with slide-on hard case
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Display TypeS-V.P.A.M. (Super Visually Perfect Algebraic Method). All the features of the existing V.P.A.M. series plus a new 2-line display and a useful Replay function. All this helps to make mathematics easier to use and easier to understand than ever before.
Power SupplyBoth Solar and Battery powered. Solar powered when light is sufficient, battery powered when light is insufficient.
Plastic KeyDesigned and engineered for easy operation.
Number Of Functions401 Functions
Basic Function• 10 + 2 digits
• Statistics (STAT-data editor, Standard deviation, Regression analysis)
• Matrix and Vector calculations
• Metric Conversions
• 40 Scientific constants
• Complex number calculations
• Integration/differential calculations
• 9 variables
• Exponent functions, Logarithmic functions
• Power functions (square root, cubic root, square, power)
• Coordinate conversion (Pol, Rec)
• Combination/Permutation (nCr, nPr)
• Factorial, Inverse, Random numbers, Random sampling of an existing list, Fractions
• Logical operations
• Hyperbolic functions, Inverse hyperbolic functions
• Base-n calculations/conversions
• Angle unit, Angle unit conversion (Deg, Rad, Gra)
• Trigonometric functions, Inverse trigonometric functions
Hardware• Battery - Solar and Battery
• Plastic keys
• Comes with slide on hard case
• Sleek Design with curved edges which makes it compact & easy to carry.
• Drop resistant body with water Resistant printing on Keys
Coordinate ConversionDedicated keys to convert polar coordinates to rectangular coordinates and vice versa.
Angle Unit Degree Radian GradianSpecifies degrees, radians, grads as the angle unit for value input and calculation result display.
Minute Degree SecondsAids in sexagesimal calculations with respect to decimal conversion.
Warranty Years3 years
Dimension161.5×77×11.1mm (D × W × H)
Country Of OriginThailand
ImporterCasio India Co., Private Limited A-41, First Floor, Mohan Cooperative Industrial Estate, Mathura Road, New Delhi - 110044
Weight G95

Key Features

Number of Functions : 401

401 Functions for easy and fast Calculations for all your mathematical and engineering problems

Trigonometrical Calculations

Calculator can perform all trigonometrical and hyperbolic functions.

Differential and Integral Calculations

Dedicated key to solve definite  differential and integral problems.

Statistical & Regression Calculations

Calculator can easily perform statistics,  regressions and distribution  problems.


Key Features

Matrix & Vector Calculation

Solve up to 3 by 3 matrix and 3-dimensional Vector problems

Multiple Mode

Single Key to change mode for Matrix, Statistics, Regression calculation etc.

SHIFT/Alpha keys for easy operation

Some functions are written in Yellow and Red colors. Use Shift key to execute yellow colored functions and Alpha key for red colored functions.

Sleek and Stylish Body

Calculator has sleep design with curved edges which makes it compact, attractive, and easy to carry. The functions are printed with water resistant printing. 


Key Features

Dual Power

This calculator works on battery and solar power both, hence it goes on for long without the need of changing battery.

Japanese Trusted Quality

Casio Calculators comply with ISO 14001, and ROHS policies and abolish usage of harmful substances like lead (Pb), mercury (Hg), cadmium (Cd), hexavalent chromium (CrVI), polybrominated biphenyls (PBB) and polybrominated diphenyl ethers (PBDE) for an effective environmental management system (EMS).  Casio pride itself for delivering high quality products and services while being environmentally conscious.

Made by Recycled Plastic

The calculator body is made by recycled plastic support green environment.

3-Year Warranty

Casio Scientific Calculator comes with 3-year of warranty (given by manufacture).


Casio Computer Co., Ltd. is a Japanese multinational consumer electronics and commercial electronics manufacturing company headquartered in Shibuya, Tokyo, Japan. Its products include calculators, mobile phones, digital cameras, electronic musical instruments, and analogue and digital watches. It was founded in 1946, and in 1957 introduced the world's first entirely electric compact calculator. It was an early digital camera innovator, and during the 1980s and 1990s, the company developed numerous affordable home electronic keyboards for musicians along with introducing the world's first mass-produced digital watches.
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