Casio

Casio FX-991ESPLUS-2WDTV

Name: FX-991ESPLUS-2WDTV
Brand: Casio
SKU: B0846D5CBP
Price: 24.5 JPY
Availability: InStock
Rating: 4.625 (1 reviews)

Rating

Model: FX-991ESPLUS-2WDTV

$24.5(incl. tax)Amazon price as of 2025-09-29

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Product Overview

The Casio FX-991ES Plus-2nd Edition is a scientific calculator featuring a Natural Textbook Display, allowing for easy-to-understand input and output. It has 417 functions, including basic trigonometric and statistical functions, as well as more advanced capabilities like integration, differentiation, and complex number calculations. The calculator is designed for engineering, polytechnic, and science students, and includes a color-coded keypad and a slide-on hard case.

Product Specifications

Display Digits

10 + 2digits

Display Type

LCD (dot-matrix)

Power Source

Solar & Battery

Number of Functions

417

Memory

-locations

Fractions

Yes

Complex Numbers

Yes

Statistics Functions

Yes

Regression Analysis

Unit Conversions

Size & Weight

Weight

3.35 ounces

Hight

0.43 inches

Width

3.03 inches

Depth

6.38 inches

Features

Equation Solver Function

Feature Description

This function allows you to solve for unknown variables in equations directly on the calculator. Instead of manually manipulating equations, you can input the equation and find the solution, saving time and reducing errors, especially useful for complex algebraic problems.

About This Product

The equation solver function allows users to solve complex equations directly on the calculator, saving time and reducing the risk of errors. This is particularly useful for algebra and calculus problems, making it a valuable tool for students and engineers. Simplifies complex calculations.

Matrix Calculation Function

Feature Description

This function enables you to perform operations on matrices, such as addition, subtraction, multiplication, and finding determinants and inverses. Useful for linear algebra calculations in subjects like engineering, physics, and computer graphics.

About This Product

The matrix calculation function enables users to perform operations such as addition, subtraction, multiplication, and finding determinants and inverses. This is beneficial for linear algebra calculations in fields like engineering, physics, and computer graphics. It enhances the calculator's versatility.

Complex Number Calculation Function

Feature Description

This function allows calculations involving complex numbers, including addition, subtraction, multiplication, division, and finding magnitudes and arguments. Simplifies calculations in electrical engineering, quantum mechanics, and other fields involving imaginary numbers.

About This Product

The complex number calculation function simplifies calculations involving complex numbers, including addition, subtraction, multiplication, division, and finding magnitudes and arguments. This is useful in electrical engineering, quantum mechanics, and other fields involving imaginary numbers. It streamlines complex math.

Base-N Calculation Function

Feature Description

This function allows you to perform calculations in different number systems, such as binary, octal, and hexadecimal, in addition to decimal. Useful for computer science and digital electronics, where these number systems are frequently used.

About This Product

The base-N calculation function allows users to perform calculations in different number systems, such as binary, octal, and hexadecimal, in addition to decimal. This is particularly useful for computer science and digital electronics, where these number systems are frequently used. It's great for digital logic.

Statistical Calculation Function

Feature Description

This function enables you to perform statistical analysis, including calculating mean, standard deviation, variance, regression, and distributions. Useful for statistics courses, data analysis, and research projects.

About This Product

The statistical calculation function enables users to perform statistical analysis, including calculating mean, standard deviation, variance, regression, and distributions. This is useful for statistics courses, data analysis, and research projects. It's a great tool for data analysis.

Unit Conversion Function

Feature Description

This function allows you to easily convert between different units of measurement, such as length, mass, volume, and temperature. Saves time and reduces errors when working with different units in physics, chemistry, or engineering problems.

About This Product

While this calculator has many functions, it lacks a dedicated unit conversion function. Users needing this feature may need to use external resources or other tools. However, the wide range of other functions still makes it a valuable tool for various calculations. A minor inconvenience.

SHOPSTAFF Rating Score

Ranked #1 out of 56 products in Category

4.6

Overall Rating

The Casio FX-991ES Plus-2nd Edition is a feature-rich scientific calculator suitable for students and professionals in STEM fields. While it lacks advanced graphing capabilities, it offers a wide range of functions and a user-friendly interface. Durability is high, typical for Casio products.

Display Type and Readability

4.5

Rating Criteria Explanation

The display is the primary interface for a scientific calculator. Consider the type of display (LCD, LED), the number of lines it shows, and the size of the characters. A multi-line display allows you to see both the input expression and the result simultaneously, which is extremely useful for complex calculations. Good contrast and adjustable brightness are also crucial for readability in various lighting conditions. A clear and easy-to-read display minimizes errors and improves the overall user experience, especially during long calculation sessions.

Rating Comments

The natural textbook display is a great feature, making equations and expressions appear as they would in a textbook. The dot-matrix LCD provides good clarity, which reduces errors and enhances the overall user experience, especially for complex calculations.

Functionality and Number of Built-in Functions

4.8

Rating Criteria Explanation

Scientific calculators come with a wide range of built-in functions, including trigonometric functions (sin, cos, tan), logarithmic functions (log, ln), exponential functions, statistical functions, and more. The number of functions and the ease of accessing them are important factors. Make sure the calculator includes the functions you need for your specific applications, whether it's for school, engineering, or scientific research. Look for calculators that offer quick access to commonly used functions through dedicated buttons or clear menu structures. Having enough functions prevents you from needing external resources during critical tasks.

Rating Comments

With 417 functions, this calculator offers a comprehensive set of tools for various mathematical and scientific tasks. The wide range of functions ensures that users have the necessary capabilities for algebra, trigonometry, calculus, and statistics, making it versatile.

Calculation Accuracy and Precision

4.7

Rating Criteria Explanation

Accuracy is paramount for any scientific calculator. The calculator should perform calculations with minimal rounding errors and provide results with sufficient precision. Check the calculator's specifications for the number of digits it displays and its internal precision. While most calculators offer acceptable accuracy for everyday use, some models are designed for higher precision, which is essential for demanding scientific and engineering applications. Pay attention to reviews and tests that assess the calculator's accuracy in performing various calculations.

Rating Comments

The calculator provides accurate results for a wide range of calculations. Its internal precision is sufficient for most academic and professional applications, ensuring reliable outcomes for both simple and complex problems. It minimizes rounding errors.

Ease of Use and Ergonomics

4.6

Rating Criteria Explanation

A scientific calculator should be easy to use, with a well-organized keyboard layout and intuitive menu navigation. Consider the size and spacing of the keys, the tactile feedback they provide, and the overall comfort of holding and using the calculator. A good ergonomic design reduces fatigue and improves accuracy, especially during extended use. Look for calculators with a logical arrangement of functions and clear labeling of keys. Some calculators also offer features like replay functions to review and edit previous calculations easily. A user-friendly design significantly enhances productivity.

Rating Comments

The color-coded keypad and well-organized layout make this calculator easy to use. The keys provide tactile feedback, and the overall design is comfortable for extended use. The menu navigation is intuitive, allowing users to quickly access different functions.

Power Source and Battery Life

4.5

Rating Criteria Explanation

Scientific calculators typically use batteries (AAA, AA, or button cells) or solar power, or a combination of both. Consider the type of power source and the expected battery life. A calculator with long battery life is essential for users who frequently use it for extended periods. Solar-powered calculators are a good option for environments with ample light, as they reduce the need for battery replacements. Some calculators also have an auto-power-off feature to conserve battery life when not in use. Hybrid models that combine solar and battery power offer the best of both worlds.

Rating Comments

The combination of solar and battery power ensures that the calculator is always ready for use. The solar panel efficiently supplements the battery, extending its life. The auto power-off feature helps conserve battery power when the calculator is not in use.

Durability and Build Quality

4.6

Rating Criteria Explanation

A scientific calculator should be durable enough to withstand everyday use and occasional drops or bumps. Look for calculators made from sturdy materials with a solid construction. A protective cover or case can also help to prevent damage to the display and keys. Consider the environment in which the calculator will be used. If it will be frequently carried in a backpack or used in a harsh environment, a more rugged model is recommended. A durable calculator will last longer and provide a better return on investment.

Rating Comments

The calculator is made from high-quality materials and has a robust construction. The included slide-on hard case provides additional protection, making it suitable for daily use in various environments. It can withstand wear and tear.

Manufacturer Reliability and Warranty

4.9

Rating Criteria Explanation

Opting for a reputable manufacturer generally ensures higher product quality, reliability, and better customer support. Established brands often have a proven track record of producing accurate and durable scientific calculators. Additionally, a good warranty provides peace of mind in case of defects or malfunctions. Check the warranty terms and conditions, including the duration of coverage and the process for claiming warranty service. Reading online reviews and customer feedback can also provide valuable insights into the manufacturer's reliability and customer service quality. A reliable manufacturer and warranty support can save you from potential headaches and expenses in the long run.

Rating Comments

Casio is a well-known and trusted brand in the calculator market, known for producing reliable and durable products. The 3-year warranty provides peace of mind, ensuring that users are protected against potential defects or malfunctions. Casio has a strong reputation.

Cost Performance

4.4

Rating Criteria Explanation

Evaluate the calculator's features and performance relative to its price. A more expensive calculator may offer advanced features and higher accuracy, but it may not be necessary for all users. Determine your specific needs and budget, and then compare the cost-performance ratio of different models. Read reviews and compare specifications to find a calculator that offers the best value for your money. Consider the long-term cost, including the cost of replacing batteries or repairing the calculator. A calculator that provides the essential features you need at a reasonable price represents good cost performance.

Rating Comments

At $24.5, this calculator offers excellent value for its extensive feature set and reliable performance. It is a worthwhile investment for students and professionals who need a versatile and durable scientific calculator. The price is very competitive.

Brand & Manufacturer Details

Casio

Casio is a multinational electronics manufacturing corporation headquartered in Tokyo, Japan.

Considerations

Avoid dropping the calculator
Keep away from moisture
Replace batteries as needed
Refer to the manual for advanced functions

Recommended For

High school students
College students
Engineers
Scientists

Not Recommended For

Users needing advanced graphing capabilities
Professionals requiring programmable functions
none in particular

Suitable For

Classroom
Office
Homework
Exams

Not Suitable For

Advanced engineering simulations
High-level statistical analysis
Complex financial modeling
none in particular

Frequently Asked Questions (FAQ)

Q.I'm not sure if this calculator is suitable for my engineering studies. Can it handle complex calculations?

A.Yes, according to staff confirmation, this calculator is highly recommended for STEM majors, including those in engineering. It can assist with advanced physics, math, and science-related problems, and it has various modes that can be very helpful. It is also suitable for FE exams.

Q.I'm not sure if this calculator is suitable for my engineering studies. Can it handle complex calculations?

Q.I'm used to a different brand of calculator. Is this Casio difficult to learn?

A.Staff confirmation indicates that this calculator is easy and intuitive to use. By simply playing with it, you can discover how powerful it is. The color-coded keypad also makes it simple to differentiate keys.

Q.I'm used to a different brand of calculator. Is this Casio difficult to learn?

Q.I'm concerned about the quality and durability of this calculator.

A.The manufacturer states that Casio calculators undergo rigorous quality tests to ensure maximum durability. Staff confirmation also mentions the premium feel of the plastic and wear-resistant printing.

Q.I'm concerned about the quality and durability of this calculator.

Q.I'm not sure if this is the right version for me, as I've heard there are different versions for different markets.

A.Staff confirmation notes that this particular model seems to be for the Indian market and may not come with a US warranty. However, the reviewer also points out the advantages of this version, such as having the functions printed on the keys instead of accessing them through menus.

Q.I'm not sure if this is the right version for me, as I've heard there are different versions for different markets.

Q.How is the button tactile?

A.Most of the staff say the buttons are tactile and fast at solving big problems, while one staff said that the button is hard to smoothly click.

Q.How is the button tactile?

A.Most of the staff say the buttons are tactile and fast at solving big problems, while one staff said that the button is hard to smoothly click.

SHOPSTAFF Rating Ranking

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Casio

FX-991ESPLUS-2WDTV

$24.5(incl. tax)Amazon price as of 2025-09-29

Casio FX-991ES Plus-2nd Edition Scientific Calculator with Natural Textbook Display and 417 functions.

Display Digits	10 + 2 digits	Display Type	LCD (dot-matrix)
Power Source	Solar & Battery	Number of Functions	417
Memory	- locations	Fractions	Yes
Complex Numbers	Yes	Statistics Functions	Yes
Regression Analysis	-	Unit Conversions	-

Equation Solver FunctionMatrix Calculation FunctionComplex Number Calculation FunctionBase-N Calculation FunctionStatistical Calculation FunctionUnit Conversion Function

4.6Overall Rating

4.5Display Type and Readability

4.8Functionality and Number of Built-in Functions

4.7Calculation Accuracy and Precision

4.6Ease of Use and Ergonomics

4.5Power Source and Battery Life

4.6Durability and Build Quality

4.9Manufacturer Reliability and Warranty

4.4Cost Performance

View Details Buy on Amazon Report Content Error

View Details Buy on Amazon Report Content Error

Casio

fx-991CW Advanced Scientific Calculator

$19.99(incl. tax)Amazon price as of 2025-09-29

Casio fx-991CW Advanced Scientific Calculator with High-Res 4-Tone Display and 540+ Functions.

Display Digits	- digits	Display Type	High-Resolution 4-Tone
Power Source	Solar Powered	Number of Functions	540+
Memory	9 locations	Fractions	Yes
Complex Numbers	-	Statistics Functions	Yes
Regression Analysis	-	Unit Conversions	Yes

Equation Solver FunctionMatrix Calculation FunctionComplex Number Calculation FunctionBase-N Calculation FunctionStatistical Calculation FunctionUnit Conversion Function

4.6Overall Rating

4.5Display Type and Readability

4.8Functionality and Number of Built-in Functions

4.7Calculation Accuracy and Precision

4.4Ease of Use and Ergonomics

4.3Power Source and Battery Life

4.6Durability and Build Quality

4.9Manufacturer Reliability and Warranty

4.5Cost Performance

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fx-115ES Plus 2nd Edition Advanced Scientific Calculator

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Casio

fx-115ES Plus 2nd Edition Advanced Scientific Calculator

$16.99(incl. tax)Amazon price as of 2025-09-29

Casio fx-115ES Plus 2nd Edition: Advanced scientific calculator with Natural Textbook Display and 280+ functions.

Display Digits	16 digits	Display Type	LCD
Power Source	Solar Powered	Number of Functions	280
Memory	9 locations	Fractions	Yes
Complex Numbers	Yes	Statistics Functions	Yes
Regression Analysis	Yes	Unit Conversions	Yes

Equation Solver FunctionMatrix Calculation FunctionComplex Number Calculation FunctionBase-N Calculation FunctionStatistical Calculation FunctionUnit Conversion Function

4.6Overall Rating

4.5Display Type and Readability

4.7Functionality and Number of Built-in Functions

4.6Calculation Accuracy and Precision

4.4Ease of Use and Ergonomics

4.5Power Source and Battery Life

4.3Durability and Build Quality

4.8Manufacturer Reliability and Warranty

4.7Cost Performance

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TI-36X Pro Engineering/Scientific Calculator

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Texas Instruments

TI-36X Pro Engineering/Scientific Calculator

$20(incl. tax)Amazon price as of 2025-09-24

TI-36X Pro: Engineering/Scientific calculator with MultiView display, ideal for high school through college.

Display Digits	- digits	Display Type	LCD
Power Source	Battery Powered	Number of Functions	-
Memory	- locations	Fractions	Yes
Complex Numbers	No	Statistics Functions	Yes
Regression Analysis	Yes	Unit Conversions	Yes

Equation Solver FunctionMatrix Calculation FunctionComplex Number Calculation FunctionBase-N Calculation FunctionStatistical Calculation FunctionUnit Conversion Function

4.5Overall Rating

4.5Display Type and Readability

4.3Functionality and Number of Built-in Functions

4.7Calculation Accuracy and Precision

4.4Ease of Use and Ergonomics

4.6Power Source and Battery Life

4.5Durability and Build Quality

4.8Manufacturer Reliability and Warranty

4.6Cost Performance

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View Details Buy on Amazon Report Content Error

Texas Instruments

TI-30XIIS Scientific Calculator

$21(incl. tax)Amazon price as of 2025-09-29

TI-30XIIS: A fundamental two-line scientific calculator for high school math and science with solar and battery power.

Display Digits	12 digits	Display Type	LCD
Power Source	Solar & Battery	Number of Functions	-
Memory	5 locations	Fractions	Yes
Complex Numbers	No	Statistics Functions	Yes
Regression Analysis	Yes	Unit Conversions	Yes

Equation Solver FunctionMatrix Calculation FunctionComplex Number Calculation FunctionBase-N Calculation FunctionStatistical Calculation FunctionUnit Conversion Function

4.5Overall Rating

4.5Display Type and Readability

4.0Functionality and Number of Built-in Functions

4.5Calculation Accuracy and Precision

4.3Ease of Use and Ergonomics

4.7Power Source and Battery Life

4.5Durability and Build Quality

4.8Manufacturer Reliability and Warranty

4.7Cost Performance

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Casio FX-991ESPLUS-2WDTV

Product Overview

Product Images

Product Specifications

Size & Weight

Features

SHOPSTAFF Rating Score

Brand & Manufacturer Details

Considerations

Recommended For

Not Recommended For

Suitable For

Not Suitable For