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5 Best Casio Fx 991ex Scientific Calculators of 2025

Last Updated - 2025/07/16

1
Best Choice

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

ROATEE

991EX 552 Functions Desktop ROATEE Scientific Calculator Rechargeable & Solar Power, Multiview 6-Line Display with Erasable LCD Writing Tablet for High School College Graduate Student and Researchers

ROATEE

CA$46.99

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Main highlights
- What Will You Get?: 991EX scientific calculator*1,instructions*1,exquisite packing box*1,packing case*1
- Scientific Calculator with Notepad: This scientific calculator for school and business intergrates calculation and notebook with a stylus pen. The lcd writing tablet enables you to take notes during the calculation, which do great help for study and work. 👉NOTE!Only Unlock the LOCK KEY will the writing area and the erase button work
- Multiview: Display shows 6 calculations at the same time on screen, greatly improves computational efficiency
- Dual Power Solar Panel & Rechargeable: The rechargeable battery is built in this scientific calculator, reduces battery replacement frequency, eco-friendly. It is also powered by solar energy so you don't need to worry about battery depletion
- Conversion of Fraction and Decimal: You can change the results through the key 'CHG'; Or you can configure calculator setting: 1. Press the button 'SHIFT'. 2. Press the button Function'. 3. Choose 1 and set the mode of fraction or decimal. 【MthIO for fraction, LineIO for decimal】
- Anti-Drop Body and Portable: The body of this scientific calculator is constructed using ultrasonic bonding technology, resulting in an almost seamless integration of the casing. It has also undergone rigorous quality testing to ensure its reliability and performance. Due to the design of anti-drop body, no need to worry about the damage by accidentally falling and it has only weighs 5 ounces can be easily put in your pocket, which is convenient for business and school
- 991EX Scientific Calculator: ROATEE business and school scientific calculator have 552 functions, deal for: General math and science, Pre-Algebra, Algebra 1 and 2, Geometry, Statistics and regressioncal culations, Calculus, fractions, decimals, Calculations involving specificnumber systems (BASE-N, binary,octal, decimal,hexadecimal), Complex number calculations, EQN, Matrix calculations, TABLE, VECTOR, SOLVE, Biology, Chemistry so on and it has memory function calculation more user-friendly
CA$46.99
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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

DUPOTA

DUPOTA OA-991EX Plus Scientific Calculator 552 Functions 2-Line 10+2 Digits Written Display Solar Battery - Ideal for Middle High School Students and Teachers, Black

DUPOTA

CA$44.54

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Main highlights
- 【Ultra-light & Portable】Advanced scientific calculators is designed to be lightweight (about 125g), suitable for carrying around. The button layout is clear, and the anti-slip material enhances the operation feel. It has various function keys to simplify complex calculations, including a "CHG" button for switching between fractions and decimals, making precise value calculations easy.
- 【Long Battery Life & Durable】Fraction calculator has a dual power system of solar and button battery for long-lasting operation. It automatically shuts down after 8 minutes of inactivity. Sliding back cover protects the calculator body, making it pressure-resistant and durable, meeting the needs of high-intensity study and outdoor use, providing peace of mind in exam scenarios.
- 【High-Efficiency Calculator】Scientific calculators has an integrated spreadsheet mode that supports data input and formula calculation; advanced operations such as 4×4 matrix and vector operations, with a quad-core processor to enhance calculation speed, making it faster to solve high-order equations and perform matrix operations, meeting the needs of efficient calculation.
- 【High Resolution & Multi-line Display】991ex scientific calculator is equipped with a high-resolution multi-line display that supports natural display of mathematical formulas and fractions, presenting expressions intuitively and showing the calculation process and results simultaneously. Adjust the screen contrast according to your preference for a clear and comfortable experience.
- 【552 Calculation Functions】Scientific calculators 991ex features 552 functions, including spreadsheet, exponential, matrix calculation, statistics, integration, algebra, complex number calculation, standard deviation, and more, suitable for handling complex equations and statistical data. From beginner to advanced courses, its practicality can meet the needs of various digital fields.
CA$44.54
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Best Value
10% Off

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

iPepul
10% Off

Scientific Calculator, IPepul Calculatrice Scientifique 991EX Type-C Rechargeable 552 Functions, Desktop Math Calculator with Notepad, School Supplies for Middle High School/College

iPepul

CA$35.99

CA$39.99
(10% Off)

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Main highlights
- The Best School Supplies: Scientific calculator with writing pad, this is an essential school supplies for middle/high school and college students, making it the perfect gift for your family to enhance their learning experience and foster a joyful learning environment.
- Secure Locking Key: This scientific calculator, equipped with a notepad, facilitates simultaneous calculation and note-taking, thereby enhancing efficiency. The writing screen features a locking key to prevent accidental deletion of written content; unlocking the key allows for screen erasure.
- Rechargeable Battery and Solar Power: Utilizing solar power and Type-C charging, the calculator remains powered anytime, anywhere, eliminating the need for button battery replacements. Suitable for elementary, middle, and high school students, as well as college students, engineers, nurses, and teachers, it ensures uninterrupted usage over extended periods.
- Multifunctional Keyboard: The calculator is equipped with a keyboard containing scientific symbols and function keys, enabling easy execution of various calculations. Particularly beneficial for professionals such as teachers, engineers, and students who frequently engage in scientific computations, this calculator enhances calculation efficiency.
- 522 Calculation Functions: IPEPUL scientific calculator boasts 522 different calculation functions, spanning trigonometric, exponential, logarithmic, calculus, statistical, and algebraic domains. It supports calculations involving complex numbers, matrices, and vectors, meeting a wide array of scientific and engineering needs.
CA$35.99
CA$39.99 (10% Off)
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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Casio

Casio Scientific Calculator FX-991ES Plus 2 Black 12-Digit Display

Casio

CA$37.40

More Details
Main highlights
- CASIO SCIENTIFIC CALCULATOR FX 991ES PLUS 2 BLACK 12-DIGIT DISPLAY
CA$37.40
5

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Casio

Casio FX-991CW Scientific Calculator, 540 Functions and Natural Display

Casio

CA$42.90

More Details
Main highlights
- Spreadsheet to study statistics
- Solving equations and systems up to 4 equations and matrix calculation 4 x 4
- Scientific calculator with over 540 functions designed for school
- QR code for continuing calculations on PC
- High resolution natural LCD display with 192 x 63 pixels and icon menu
CA$42.90

5 Best Casio Fx 991ex Scientific Calculators of 2025

991EX 552 Functions Desktop ROATEE Scientific Calculator Rechargeable & Solar Power, Multiview 6-Line Display with Erasable LCD Writing Tablet for High School College Graduate Student and Researchers

DUPOTA OA-991EX Plus Scientific Calculator 552 Functions 2-Line 10+2 Digits Written Display Solar Battery - Ideal for Middle High School Students and Teachers, Black

Scientific Calculator, IPepul Calculatrice Scientifique 991EX Type-C Rechargeable 552 Functions, Desktop Math Calculator with Notepad, School Supplies for Middle High School/College

Casio Scientific Calculator FX-991ES Plus 2 Black 12-Digit Display

Casio FX-991CW Scientific Calculator, 540 Functions and Natural Display

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