Which calculator is best for engineering students?

Choosing the right scientific calculator is essential for engineering students, given the complexity and range of calculations required in their coursework. CASIO, a leading brand in the market, offers several models tailored to meet the needs of students and professionals alike. Among the most popular models are the CASIO FX-991 ES Plus (both 1st and 2nd editions) and the CASIO FX-991 EX-Classwiz. This article provides a detailed comparison of these calculators, covering their features, functions, design, warranty, and price to help you make an informed decision.

1. Casio FX-991 ES Plus: 1st and 2nd Edition

Features and Functions

1st Edition:

  • Natural Textbook Display: This feature allows expressions and results to be displayed as they appear in textbooks, making it easier to understand and follow calculations.
  • 417 Functions: Includes complex number calculations, matrix and vector calculations, integration and differentiation, and more.
  • Solar and Battery Power: Ensures long-lasting performance with dual power sources.
  • Equation Solver: Helps solve polynomial and simultaneous equations.
  • 10+2 Digit Display: Offers a clear view of large numbers and complex expressions.

2nd Edition:

  • Enhanced Display: Improved display quality for better readability.
  • Additional Functions: Includes improved computational capabilities and more functions compared to the 1st edition.
  • Same Core Features: Retains all the features of the 1st edition, including natural textbook display and dual power.


Both editions of the FX-991 ES Plus feature a sleek, ergonomic design with a sturdy plastic body. The keys are well-spaced and designed for ease of use, ensuring comfortable and efficient data entry.


CASIO offers a standard 3-year warranty on the FX-991 ES Plus, covering manufacturing defects and ensuring reliable performance.


  • 1st Edition: Generally priced around $20-$25.
  • 2nd Edition: Slightly higher, around $25-$30, due to enhanced features and improved display.

2. Casio FX-991 EX-Classwiz

Features and Functions

  • High-Resolution LCD: Provides a clearer and more detailed display of calculations.
  • 552 Functions: A broader range of functions, including advanced statistical distribution, probability calculations, and QR code generation for graphing on smartphones.
  • Natural Textbook Display: Similar to the ES Plus series, allowing expressions and results to be displayed as they appear in textbooks.
  • Faster Processor: Significantly faster than the ES Plus models, ensuring quicker calculations.
  • Improved Memory: Enhanced memory capacity for handling more complex calculations.
  • QR Code Functionality: Allows users to generate QR codes for graphs and access detailed solutions and visualizations via smartphones.
  • Dual Power: Solar and battery power for extended usage.


The FX-991 EX-Classwiz features a modern, professional design with a high-resolution display. The interface is intuitive, with clearly labeled keys and a user-friendly layout. The calculator is slightly more robust than the ES Plus models, reflecting its advanced capabilities.


CASIO provides a 3-year warranty for the FX-991 EX-Classwiz, similar to the ES Plus models, ensuring dependable performance and support.


  • Generally priced around $30-$35, reflecting its advanced features and superior performance.

3. Which One is Good for You?

Casio FX-991 ES Plus (1st and 2nd Editions)


  • Affordable and reliable.
  • Comprehensive functions suitable for a wide range of engineering calculations.
  • Natural textbook display aids in understanding complex expressions.
  • Dual power ensures long-lasting use.


  • Slightly lower display resolution compared to the Classwiz.
  • Slower processing speed for complex calculations.

Ideal For:

  • Engineering students looking for a budget-friendly, reliable calculator with all essential functions.
  • Those who prefer a traditional calculator layout and design.

Casio FX-991 EX-Classwiz


  • High-resolution display for clearer and more detailed calculations.
  • Faster processing speed for quick and efficient calculations.
  • Broader range of functions, including advanced statistical and probability calculations.
  • QR code functionality for enhanced learning and visualization.
  • Modern, professional design.


  • Slightly higher price point compared to the ES Plus models.

Ideal For:

  • Engineering students who require advanced features and faster processing speeds.
  • Those who benefit from additional functionalities like QR code generation for graphing and enhanced memory capacity.
  • Students willing to invest a bit more for a superior display and performance.


Choosing between the CASIO FX-991 ES Plus and the FX-991 EX-Classwiz depends on your specific needs and budget. The FX-991 ES Plus is a reliable, affordable option with all the essential functions for engineering students. It is particularly suitable for those who prefer a traditional calculator design and are looking for a cost-effective solution.

On the other hand, the FX-991 EX-Classwiz offers advanced features, a high-resolution display, and faster processing speeds, making it ideal for students who require more robust capabilities and are willing to invest a bit more for enhanced performance and additional functionalities.

Ultimately, both calculators are excellent choices for engineering students, and your decision should be based on your individual preferences and requirements.


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