In the modern world of education and technology, the right calculator can make all the difference. Whether you’re solving complex equations, performing matrix operations, or calculating derivatives, accuracy and speed are key. Among the many options available, the Casio FX-991ES Plus-2 Scientific Calculator stands out as a trusted companion for students, engineers, and professionals.
As an upgraded version of Casio’s popular FX-991ES Plus, the Plus-2 model introduces improved performance, a clearer display, and enhanced user comfort—all without sacrificing the reliability that Casio is known for. This calculator bridges the gap between simplicity and power, making it one of the most preferred choices across schools, colleges, and technical institutions worldwide.
Below is a comprehensive review that explains everything you need to know about this advanced calculator, including its features, specifications, usability, pros, and more.
Casio FX-991ES Plus-2 Scientific Calculator: Quick Specifications
| Feature | Description |
| Model Name | Casio FX-991ES Plus-2 |
| Type | Non-Programmable Scientific Calculator |
| Display Type | Natural Textbook Display (Natural-V.P.A.M.) |
| Total Functions | 417 Built-In Scientific & Mathematical Functions |
| Power Source | Dual Power (Solar + Battery) |
| Calculus Support | Integration and Differentiation |
| Matrix/Vector Support | 3×3 Matrices and 3D Vectors |
| Statistical Operations | Standard Deviation, Regression, Probability |
| Dimensions | 11.1 × 77 × 162 mm |
| Weight | Approximately 95 grams |
| Suitable For | Students, Engineers, Teachers, Professionals |
Design and Build Quality
The Casio FX-991ES Plus-2 is designed with both practicality and durability in mind. Its sleek, blue-grey finish gives it a modern and premium appearance. The keys are soft yet responsive, ensuring every press registers accurately. Unlike cheaper alternatives, this model uses engraved key lettering that does not fade over time, maintaining readability for years.
A hard protective cover is included, which slides securely onto the front or back of the calculator to shield it from dust, scratches, and accidental falls. At around 95 grams, it’s light enough to carry anywhere—ideal for daily academic or professional use.
The overall layout is intuitive, with function keys grouped logically for quick access. The mode, shift, and alpha buttons are colored distinctly, minimizing confusion during fast-paced calculations. This design makes the Plus-2 not only reliable but also comfortable for extended use.
Natural Textbook Display: A Game-Changer
One of the standout features of the FX-991ES Plus-2 is its Natural Textbook Display (Natural-V.P.A.M.), which allows mathematical expressions to appear exactly as they do in textbooks. Fractions, square roots, exponents, and logarithmic expressions are displayed in true mathematical form, making it easier to understand and verify your work.
This visual accuracy reduces errors and enhances learning for students who are still mastering the fundamentals. For example, instead of seeing 1/2√3 in a linear form, you’ll see it displayed as a proper fraction and root—just like in your notes. It’s a small but powerful improvement that enhances usability and comprehension.
Functionality and Performance Review
The Casio FX-991ES Plus-2 is built for performance. With 417 functions, it caters to virtually every academic and technical need—from simple arithmetic to advanced scientific computations.
Here’s what makes it so powerful:
- Equation Solver: Solves linear, quadratic, polynomial, and simultaneous equations effortlessly.
- Calculus Support: Performs both definite and indefinite integration and differentiation.
- Complex Number Operations: Handles real and imaginary numbers with precision.
- Matrix & Vector Calculations: Supports up to 3×3 matrices and 3-dimensional vectors—vital for engineering and physics students.
- Statistical Functions: Includes mean, standard deviation, regression analysis, and probability distribution tools.
- Scientific Constants: Pre-loaded physical constants (like Avogadro’s number, speed of light, etc.) for quick access during physics or chemistry studies.
Its upgraded processor ensures faster computation times compared to the previous FX-991ES Plus. You’ll notice smoother transitions between modes and near-instant results even for complex equations.
Advanced Mathematical Capabilities
The FX-991ES Plus-2 isn’t just for basic use—it’s engineered for high-level problem solving.
Let’s explore its advanced capabilities in depth:
- Calculus Functions: Students dealing with integrals and derivatives can use the calculator’s built-in tools to perform real-time differentiation and integration. The ability to solve definite integrals saves time during exams or research work.
- Complex Numbers: For electronics and electrical engineering students, complex number calculations are critical. The calculator can process imaginary numbers (using the ‘i’ symbol) and return results in both polar and rectangular forms.
- Matrix & Vector Operations: The FX-991ES Plus-2 allows you to input and manipulate matrices up to 3×3, perform determinant calculations, inverses, and even solve systems of linear equations. Similarly, vector calculations like dot product and cross product are also supported.
- Statistical Analysis: In subjects like economics or data science, statistical computation is essential. This calculator provides regression analysis (linear, logarithmic, exponential) and measures of central tendency and dispersion with ease.
- Engineering & Scientific Notation: The calculator supports engineering notation, making it easier to handle extremely large or small numbers (like in micro or nano calculations). You can convert between different units seamlessly.
Dual Power System: Solar + Battery Efficiency
The FX-991ES Plus-2 operates on dual power—a built-in solar panel combined with a backup battery. This ensures uninterrupted performance even in low-light conditions.
Casio has also integrated auto power-off technology that turns off the calculator after a period of inactivity, conserving energy. With regular use, the internal battery (LR44 type) lasts around 2–3 years, making it highly economical.
This dual system ensures you never face downtime during critical exams or project work.
User Experience and Practical Usage
From a user’s perspective, the casio fx-991es plus-2 scientific calculator feels exceptionally smooth. The key response is quick and comfortable, preventing fatigue during long sessions. Casio fx-991es plus-2 scientific calculatorThe Replay Function allows users to scroll through previous calculations, edit values, and recompute without starting over—a huge time-saver during tests.
The clear high-resolution display ensures visibility in different lighting environments, while the compact form factor makes it ideal for carrying in backpacks or exam kits.
For teachers and professors, this calculator is also an excellent tool to demonstrate classroom concepts thanks to its clarity and precision.
Casio FX-991ES Plus vs Casio FX-991ES Plus-2
| Feature | FX-991ES Plus | FX-991ES Plus-2 |
| Display Type | Natural Textbook Display | Enhanced Natural Display (Higher Contrast) |
| Functions | 417 | 417 (Same, Faster Processing) |
| Design | Classic Grey Body | Sleek Blue-Grey Modern Design |
| Button Feedback | Medium Firmness | Softer, More Responsive Keys |
| Processing Speed | Normal | Improved for Quicker Calculations |
| Power System | Dual Power | Dual Power (Optimized Efficiency) |
| User Experience | Good | Excellent |
The FX-991ES Plus-2 refines the experience by improving display clarity, processing speed, and design ergonomics. While both models share similar functionality, the Plus-2 feels more fluid and modern, making it the better choice for 2025 and beyond.
Academic and Professional Applications
The Casio FX-991ES Plus-2 is not just for students—it’s a reliable tool across multiple fields:
- 🎓 Students: Perfect for high school, college, and university levels, covering subjects like algebra, calculus, and statistics.
- 🧑🔬 Engineers & Scientists: Ideal for quick field computations, formula solving, and data analysis.
- 🧮 Teachers: Helps in demonstrating equations, formulas, and mathematical concepts in class.
- 🧑🏫 Researchers: Accurate enough for advanced computations and academic publications.
From physics labs to engineering projects, this calculator handles everything from basic trigonometric functions to complex matrix transformations.
Pros and Cons
Pros
- 417 functions suitable for all academic levels
- The dual power system ensures long life
- Enhanced display for clearer results
- Exam-approved (non-programmable)
- Compact, lightweight, and durable
- Faster processing and intuitive replay function
- Affordable price for high-end performance
Cons
- ❌ No graphing or programming feature
- ❌ Limited display for extremely long equations
- ❌ Battery replacement required after a few years
Despite minor drawbacks, the overall performance makes it one of the best calculators in its category.
Price, Availability & Warranty
The Casio FX-991ES Plus-2 is widely available across global online stores like Amazon, Flipkart, and local electronics outlets.
- Price in India: ₹1,000 – ₹1,500
- Price Internationally: Around $15 – $25 USD
Casio typically offers a 1-year manufacturer’s warranty, covering manufacturing defects. The device’s robust build ensures it often lasts several years without any issues.
User Reviews and Feedback
Students and professionals across the globe have praised the Casio FX-991ES Plus-2 for its accuracy, speed, and simplicity.
Many users report that it feels smoother than the older Plus model and appreciate the upgraded button design. casio fx-991es plus-2 scientific calculator. The clear display and textbook-style layout are also common highlights.
On academic forums, engineering students frequently recommend this model for its ability to handle real-world problem-solving efficiently. Teachers, too, value its reliability during exam supervision since it’s non-programmable and approved for most testing boards.
The Casio FX-991ES Plus-2 Scientific Calculator is a perfect balance of innovation, accuracy, and value. It takes everything great about the FX-991ES Plus and refines it with smoother performance, a better display, and an ergonomic design.
Whether you’re solving complex integrals, performing vector operations, or analyzing data sets, this calculator ensures you can focus on learning instead of worrying about manual errors. Its dual power, portability, and exam-safe nature make it a long-term investment for every student and professional.
FAQs
Q1. Is the Casio FX-991ES Plus-2 allowed in exams?
Ans: Yes, it’s a non-programmable calculator and approved by most educational boards, including engineering and university exams worldwide.
Q2. What makes the Casio FX-991ES Plus-2 better than the older model?
Ans: It features an enhanced display, faster processing speed, and better button design for improved comfort and reliability. Casio fx-991es plus-2 scientific calculator
Q3. Does this calculator support integration and differentiation?
Ans: Absolutely. Casio fx-991es plus-2 scientific calculator. You can calculate definite integrals and derivatives directly using built-in calculus functions.
Q4. Can it handle matrix and vector problems?
Ans: Yes, it supports 3×3 matrix and 3D vector calculations, allowing operations like addition, multiplication, and cross products.
Q5. How long does the battery last in the Casio FX-991ES Plus-2?
Ans: The LR44 battery typically lasts 2–3 years, and the solar panel ensures the calculator functions even when the battery runs low.
Final Thoughts
The Casio FX-991ES Plus-2 Scientific Calculator is more than just a mathematical device—it’s a symbol of precision, reliability, and academic excellence. Built for students, engineers, and educators, it delivers professional-grade functionality at a student-friendly price.
Its 417 functions, natural display, dual power, and ergonomic design make it a timeless tool for those who value both performance and simplicity. Whether you’re preparing for exams or solving real-world engineering challenges, this calculator ensures you’re always a step ahead.