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Best Casio Scientific Calculator Fx 991ex of 2026
Last updated on 01/04/2026
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1
Casio fx-991CW including a WYNGS protective case in Black - Basic Set
Casio
Why we love it
Reliable calculations for everyday use.
Robust protection for your calculator.
Extended warranty for long-lasting reliability.
Main Highlights
The CALCUSO basic package offers an ideal combination of the powerful Casio fx-991CW and a robust protective case from WYNGS. It is perfect for daily use at school, university, and the office, ensuring reliable calculations and secure protection on the go.
The Casio fx-991CW is a scientific calculator with functions for algebra, trigonometry, statistics and more. With a clear display, user-friendly interface and long battery life, it is ideal for school and college.
Robust WYNGS Protective Case: The protective case offers optimal protection for your Casio fx-991CW. It reliably protects against splashes, shocks, and scratches – ideal for travel, school, or university, and ensures a longer lifespan for your calculator!
Extended Warranty to 5 Years: Benefit from the exclusive CALCUSO warranty extension for the Casio fx-991CW. With 5 years of coverage, you are fully protected – ensuring long-lasting reliability at school, university, and work!
The set includes the Casio fx-991CW, a WYNGS protective case in black for optimal protection, as well as an extended warranty from CALCUSO, providing additional security and reliability. Perfect for school and work!
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9.9
Exceptional
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9.9
Exceptional
Casio
Casio fx-991CW including a WYNGS protective case in Black - Basic Set
Check Price
Show More
Why we love it
Reliable calculations for everyday use.
Robust protection for your calculator.
Extended warranty for long-lasting reliability.
Main Highlights
The CALCUSO basic package offers an ideal combination of the powerful Casio fx-991CW and a robust protective case from WYNGS. It is perfect for daily use at school, university, and the office, ensuring reliable calculations and secure protection on the go.
The Casio fx-991CW is a scientific calculator with functions for algebra, trigonometry, statistics and more. With a clear display, user-friendly interface and long battery life, it is ideal for school and college.
Robust WYNGS Protective Case: The protective case offers optimal protection for your Casio fx-991CW. It reliably protects against splashes, shocks, and scratches – ideal for travel, school, or university, and ensures a longer lifespan for your calculator!
Extended Warranty to 5 Years: Benefit from the exclusive CALCUSO warranty extension for the Casio fx-991CW. With 5 years of coverage, you are fully protected – ensuring long-lasting reliability at school, university, and work!
The set includes the Casio fx-991CW, a WYNGS protective case in black for optimal protection, as well as an extended warranty from CALCUSO, providing additional security and reliability. Perfect for school and work!
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Value for Money
2
Casio fx-991ES Plus 2 Scientific Calculator with 417 Functions and Display, Natural
Casio
Why we love it
Age-approved for younger users.
Natural textbook-style display.
Solar and battery powered.
Main Highlights
Approved for age version
Natural display to insert and display numerical expressions as they appear on textbooks
24 brackets
Regression and correlation coefficient
2023232324 battery.Solar powered and battery.Dimensions: 1. 4 x 7 7 x 16.2 cm
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9.9
Exceptional
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9.9
Exceptional
Casio
Casio fx-991ES Plus 2 Scientific Calculator with 417 Functions and Display, Natural
Check Price
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Why we love it
Age-approved for younger users.
Natural textbook-style display.
Solar and battery powered.
Main Highlights
Approved for age version
Natural display to insert and display numerical expressions as they appear on textbooks
24 brackets
Regression and correlation coefficient
2023232324 battery.Solar powered and battery.Dimensions: 1. 4 x 7 7 x 16.2 cm
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3
Casio fx-991CW+ Scientific Calculator (UK Version) - Upgrade from previous fx-991CW model
Casio
22% Off
Why we love it
Versatile calculation capabilities available.
Comprehensive statistics functionality included.
Powerful solver for all equations.
Main Highlights
Casio fx-991CW+ UK is the new upgraded version of Casio fx-991CW
CALCULATION: arithmetic, trigonometry, logarithms, exponential, hyperbolic, equivalent ratio, complex number, vectors, matrices
STATISTICS: mean, standard deviation, quartiles, regression
SOLVER: simultaneous linear, polynomial, non-linear, inequalities
FUNCTIONS: table of values (2 functions)
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9.8
Exceptional
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9.8
Exceptional
Casio
Casio fx-991CW+ Scientific Calculator (UK Version) - Upgrade from previous fx-991CW model
22% Off
Check Price
Show More
Why we love it
Versatile calculation capabilities available.
Comprehensive statistics functionality included.
Powerful solver for all equations.
Main Highlights
Casio fx-991CW+ UK is the new upgraded version of Casio fx-991CW
CALCULATION: arithmetic, trigonometry, logarithms, exponential, hyperbolic, equivalent ratio, complex number, vectors, matrices
STATISTICS: mean, standard deviation, quartiles, regression
SOLVER: simultaneous linear, polynomial, non-linear, inequalities
FUNCTIONS: table of values (2 functions)
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4
Casio fx-991CW Advanced Scientific Calculator (UK Version)
Casio
29% Off
Why we love it
Approved for all UK exams.
Best-selling advanced calculator.
Dual powered and reliable.
Main Highlights
Casio fx-991 is the UK’s best-selling ‘advanced scientific’ calculator.
fx-991 CW is the new upgraded version of the fx-991 EX
Allowed in every UK exam where a calculator can be used
Approved for Key stages 3, 4 and 5, recommended for Advanced GCSE, A/AS level and Highers
Dual powered, solar with battery back up and auto power-off
Ideal exam calculator for: GCSE Higher SQA Higher
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9.8
Exceptional
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9.8
Exceptional
Casio
Casio fx-991CW Advanced Scientific Calculator (UK Version)
29% Off
Check Price
Show More
Why we love it
Approved for all UK exams.
Best-selling advanced calculator.
Dual powered and reliable.
Main Highlights
Casio fx-991 is the UK’s best-selling ‘advanced scientific’ calculator.
fx-991 CW is the new upgraded version of the fx-991 EX
Allowed in every UK exam where a calculator can be used
Approved for Key stages 3, 4 and 5, recommended for Advanced GCSE, A/AS level and Highers
Dual powered, solar with battery back up and auto power-off
Ideal exam calculator for: GCSE Higher SQA Higher
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5
Dakexiong FX-991EX Scientific Calculator Multi-Function Calculator Scientific, 552 Functions, 10+2 Screen Displays - Ideal for Students and Teachers, Office, Black
Dakexiong
Why we love it
Clear, sharp display eases readability.
Extensive functions for all calculations.
Durable cover prevents damage effectively.
Main Highlights
High-definition display: 10+2 on-screen display provides a clear, sharp view of your calculations. Whether you're working with complex equations or simple arithmetic, the large screen ensures easy readability and reduces eyestrain during prolonged use.
Powerful: Equipped with 552 functions, FX-991EX Scientific Calculator can handle a wide range of mathematical operations, from basic arithmetic to matrix calculations, statistical functions and vector operations. Its responsive system produces quick results, making it an excellent tool for solving complex problems in a timely manner.
Durable Protection: Scientific Calculator comes with a sliding hard shell cover. The cover not only protects the keys from scratches and damage, but also protects the body of the calculator. Calculator Scientific provides a degree of protection against accidental drops and knocks, ensuring that the calculator stays in perfect condition for a long time.
Reliable buttons: Plastic buttons are designed to provide a responsive touch. Each button is easy to press and has a unique feel, which is essential for accurate input. Additionally, these buttons are highly resistant to wear and tear and retain their functionality even after prolonged use.
Convenient Power: Powered by button batteries for stable and long-lasting power. Batteries can be replaced at any time, eliminating the need for frequent charging or reliance on unstable power sources.
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9.6
Superb
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9.6
Superb
Dakexiong
Dakexiong FX-991EX Scientific Calculator Multi-Function Calculator Scientific, 552 Functions, 10+2 Screen Displays - Ideal for Students and Teachers, Office, Black
Check Price
Show More
Why we love it
Clear, sharp display eases readability.
Extensive functions for all calculations.
Durable cover prevents damage effectively.
Main Highlights
High-definition display: 10+2 on-screen display provides a clear, sharp view of your calculations. Whether you're working with complex equations or simple arithmetic, the large screen ensures easy readability and reduces eyestrain during prolonged use.
Powerful: Equipped with 552 functions, FX-991EX Scientific Calculator can handle a wide range of mathematical operations, from basic arithmetic to matrix calculations, statistical functions and vector operations. Its responsive system produces quick results, making it an excellent tool for solving complex problems in a timely manner.
Durable Protection: Scientific Calculator comes with a sliding hard shell cover. The cover not only protects the keys from scratches and damage, but also protects the body of the calculator. Calculator Scientific provides a degree of protection against accidental drops and knocks, ensuring that the calculator stays in perfect condition for a long time.
Reliable buttons: Plastic buttons are designed to provide a responsive touch. Each button is easy to press and has a unique feel, which is essential for accurate input. Additionally, these buttons are highly resistant to wear and tear and retain their functionality even after prolonged use.
Convenient Power: Powered by button batteries for stable and long-lasting power. Batteries can be replaced at any time, eliminating the need for frequent charging or reliance on unstable power sources.
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6
CLIUNT FX-991EX Scientific Calculator, 552 Functions Engineering Scientific Calculator, 10+2 LCD Digits Written Display Math Calculators for School Students, Business, Office
CLIUNT
Why we love it
Extensive 552 scientific functions.
Dual power for convenience.
High-resolution, clear display.
Main Highlights
552 Functions: This fx-991ex scientific calculator provides a total of 552 scientific functions, covering a wide range of mathematical operations, including basic calculations, algebra, fractions, derivatives, integrals, scientific functions and statistical calculations, etc., Engineering scientific calculator allowing you to handle complex calculations with ease calculation.
Dual Power Supply Electronic Calculator: Solar panel + replaceable button battery, dual safe uninterruptible power supply, environmental protection and energy saving advantages, smooth use, long battery life, you can use scientific calculator anytime and anywhere without worrying about battery problems.
High-Resolution Display: The high-resolution Lcd display scientific calculator can be used to view spreadsheets, calculations, and other data,scientific calculator ensuring that numbers, symbols, and graphs are displayed clearly and easy to read, engineering scientific calculator is especially useful when working with complex mathematical expressions and charts.
Natural Textbook Display: The fx-991ex calculator features a natural textbook display that covers most of the scientific functions students from middle school to college need for use in courses and exams. Entering expressions, symbols and arithmetic operations in the same form as written in the textbook ,scientific calculator will help students view the calculation process and results, engineering scientific calculator making it easier for students to understand and verify calculations.
Easy to Carry: The size of this fx-991ex scientific calculator is 16.5*8*1.5cm and the weight is 170g. The compact and lightweight design makes it easy to carry and use anywhere. Engineering scientific calculator is equipped with a sliding hard case for easy portability.
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9.6
Superb
Check Price
9.6
Superb
CLIUNT
CLIUNT FX-991EX Scientific Calculator, 552 Functions Engineering Scientific Calculator, 10+2 LCD Digits Written Display Math Calculators for School Students, Business, Office
Check Price
Show More
Why we love it
Extensive 552 scientific functions.
Dual power for convenience.
High-resolution, clear display.
Main Highlights
552 Functions: This fx-991ex scientific calculator provides a total of 552 scientific functions, covering a wide range of mathematical operations, including basic calculations, algebra, fractions, derivatives, integrals, scientific functions and statistical calculations, etc., Engineering scientific calculator allowing you to handle complex calculations with ease calculation.
Dual Power Supply Electronic Calculator: Solar panel + replaceable button battery, dual safe uninterruptible power supply, environmental protection and energy saving advantages, smooth use, long battery life, you can use scientific calculator anytime and anywhere without worrying about battery problems.
High-Resolution Display: The high-resolution Lcd display scientific calculator can be used to view spreadsheets, calculations, and other data,scientific calculator ensuring that numbers, symbols, and graphs are displayed clearly and easy to read, engineering scientific calculator is especially useful when working with complex mathematical expressions and charts.
Natural Textbook Display: The fx-991ex calculator features a natural textbook display that covers most of the scientific functions students from middle school to college need for use in courses and exams. Entering expressions, symbols and arithmetic operations in the same form as written in the textbook ,scientific calculator will help students view the calculation process and results, engineering scientific calculator making it easier for students to understand and verify calculations.
Easy to Carry: The size of this fx-991ex scientific calculator is 16.5*8*1.5cm and the weight is 170g. The compact and lightweight design makes it easy to carry and use anywhere. Engineering scientific calculator is equipped with a sliding hard case for easy portability.
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7
Casio FX-991CW Classwiz Non-Programmable Scientific Calculator
Casio
Why we love it
Better resolution for clarity.
Natural display for formulas.
Inbuilt QR Code function.
Main Highlights
Newer Version of Casio 991 EX & 4-times better resolution than Casio 991ES Plus for easier viewing of long expressions
Natural Textbook Display- Input and display fractions, powers, logarithms, roots, and other mathematical formulas and symbol just as they appear in textbooks
Scientific Calculator with inbuilt QR Code function --Calculator can generate QR Code -- Useful from graphical visualization & accessing user manual using your smart phone
Faster than any previous Casio Non-Programmable Scientific Calculator
Up to Four Degree Simultaneous and Polynomial Solver, Numerical Integration, Differentiation, Statistics, Matrix, Vector Calculation
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9.4
Superb
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9.4
Superb
Casio
Casio FX-991CW Classwiz Non-Programmable Scientific Calculator
Check Price
Show More
Why we love it
Better resolution for clarity.
Natural display for formulas.
Inbuilt QR Code function.
Main Highlights
Newer Version of Casio 991 EX & 4-times better resolution than Casio 991ES Plus for easier viewing of long expressions
Natural Textbook Display- Input and display fractions, powers, logarithms, roots, and other mathematical formulas and symbol just as they appear in textbooks
Scientific Calculator with inbuilt QR Code function --Calculator can generate QR Code -- Useful from graphical visualization & accessing user manual using your smart phone
Faster than any previous Casio Non-Programmable Scientific Calculator
Up to Four Degree Simultaneous and Polynomial Solver, Numerical Integration, Differentiation, Statistics, Matrix, Vector Calculation
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8
FX-991EX Scientific Calculator with 552 Functions, Advanced Scientific Calculator with 10+2 Screen Displays for Students, School, Office, Business Home Daily Use (Black)
KEGOZ
8% Off
Why we love it
Clear large display screen.
Extensive range of functions.
Durable design with protection.
Main Highlights
【Extra-Large Screen】This FX-991EX scientific calculator is equipped with a large and high-resolution display screen that can show numbers very clearly. Whether dealing with complex equations or simple summation, the results are obvious. Reduce eye fatigue during prolonged use and provide a more comfortable computing experience.
【Powerful Functionality】This FX-991EX scientific calculator is equipped with 552 functions, covering everything from basic arithmetic to advanced operations, including statistics, matrices, and vectors. Its powerful system can quickly provide accurate results, ensuring high efficiency.
【Durable Protection】This FX-991EX scientific calculator includes a sliding hard cover that effectively prevents scratches and accidental impacts, keeps the buttons intact, and ensures that the calculator remains in its original state over time.
【Exceptional Battery Life】This FX-991EX scientific calculator is powered by button batteries and features low power consumption and stable power supply, eliminating battery anxiety. It is very suitable for exams or for use anytime, anywhere.
【Responsive Buttons】The plastic buttons on this FX-991EX scientific calculator provide responsive tactile feedback. Each button is easy to press and feels unique, which is crucial for accurate input. These buttons have high strength and wear resistance, and can maintain their function even after prolonged use.
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9.3
Superb
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9.3
Superb
KEGOZ
FX-991EX Scientific Calculator with 552 Functions, Advanced Scientific Calculator with 10+2 Screen Displays for Students, School, Office, Business Home Daily Use (Black)
8% Off
Check Price
Show More
Why we love it
Clear large display screen.
Extensive range of functions.
Durable design with protection.
Main Highlights
【Extra-Large Screen】This FX-991EX scientific calculator is equipped with a large and high-resolution display screen that can show numbers very clearly. Whether dealing with complex equations or simple summation, the results are obvious. Reduce eye fatigue during prolonged use and provide a more comfortable computing experience.
【Powerful Functionality】This FX-991EX scientific calculator is equipped with 552 functions, covering everything from basic arithmetic to advanced operations, including statistics, matrices, and vectors. Its powerful system can quickly provide accurate results, ensuring high efficiency.
【Durable Protection】This FX-991EX scientific calculator includes a sliding hard cover that effectively prevents scratches and accidental impacts, keeps the buttons intact, and ensures that the calculator remains in its original state over time.
【Exceptional Battery Life】This FX-991EX scientific calculator is powered by button batteries and features low power consumption and stable power supply, eliminating battery anxiety. It is very suitable for exams or for use anytime, anywhere.
【Responsive Buttons】The plastic buttons on this FX-991EX scientific calculator provide responsive tactile feedback. Each button is easy to press and feels unique, which is crucial for accurate input. These buttons have high strength and wear resistance, and can maintain their function even after prolonged use.
Show More
9
Wxeadu FX-991EX Scientific Calculator, A Level Maths Calculator with 552 Functions, 10+2 Digits Written Display, Portable Scientific Calculator for Students, Business, Office, Engineering (Black)
Wxeadu
17% Off
Why we love it
Master complex calculations effortlessly.
Clearly displays formulas and results.
Durable design for prolonged use.
Main Highlights
📚 Universal 552 Functions: Mastering complex calculations has never been simpler! FX-991EX scientific calculator features an impressive 552 built-in functions, comprehensively covering everything from basic arithmetic to university-level matrix, statistical, and vector operations. It serves as the ideal companion for A-Levels, engineering studies, and professional examinations
🖥️ High-Definition Large-Format Display: No more squinting at your calculations! The 10+2 digit large screen clearly displays both formulae and results simultaneously, significantly reducing input errors. FX-991EX scientific calculator design makes extended use more comfortable, markedly boosting learning efficiency
🛡️ Included Dedicated Sliding Hard Case: FX-991EX scientific calculator's rigid casing snugly protects the body, effectively preventing scratches and accidental key presses. Easily slips into a schoolbag or pencil case, suitable for classrooms, laboratories, and mobile office scenarios
⚡ Responsive, durable keys: FX-991EX scientific calculator employs high-quality plastic keys offering sensitive actuation and clear feedback. Its robust, fatigue-resistant design ensures stable performance even under prolonged, high-frequency use, standing up to exams and demanding workloads
🔋 Button Cell Power: Utilises the universal CR2025 button battery for long-lasting, stable power with effortless replacement. Independent of light or sockets, it operates reliably in exam halls, libraries, or outdoors. FX-991EX scientific calculator eliminates battery anxiety
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9.3
Superb
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9.3
Superb
Wxeadu
Wxeadu FX-991EX Scientific Calculator, A Level Maths Calculator with 552 Functions, 10+2 Digits Written Display, Portable Scientific Calculator for Students, Business, Office, Engineering (Black)
17% Off
Check Price
Show More
Why we love it
Master complex calculations effortlessly.
Clearly displays formulas and results.
Durable design for prolonged use.
Main Highlights
📚 Universal 552 Functions: Mastering complex calculations has never been simpler! FX-991EX scientific calculator features an impressive 552 built-in functions, comprehensively covering everything from basic arithmetic to university-level matrix, statistical, and vector operations. It serves as the ideal companion for A-Levels, engineering studies, and professional examinations
🖥️ High-Definition Large-Format Display: No more squinting at your calculations! The 10+2 digit large screen clearly displays both formulae and results simultaneously, significantly reducing input errors. FX-991EX scientific calculator design makes extended use more comfortable, markedly boosting learning efficiency
🛡️ Included Dedicated Sliding Hard Case: FX-991EX scientific calculator's rigid casing snugly protects the body, effectively preventing scratches and accidental key presses. Easily slips into a schoolbag or pencil case, suitable for classrooms, laboratories, and mobile office scenarios
⚡ Responsive, durable keys: FX-991EX scientific calculator employs high-quality plastic keys offering sensitive actuation and clear feedback. Its robust, fatigue-resistant design ensures stable performance even under prolonged, high-frequency use, standing up to exams and demanding workloads
🔋 Button Cell Power: Utilises the universal CR2025 button battery for long-lasting, stable power with effortless replacement. Independent of light or sockets, it operates reliably in exam halls, libraries, or outdoors. FX-991EX scientific calculator eliminates battery anxiety
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10
Peixiong FX991-EX Battery & Solar Powered Scientific Calculator with 4.4 Inches LCD Pad, FX-991EX Advanced Engineering/Scientific Calculator-552 Function with Notepad for School, Office (Black)
Peixiong
Why we love it
Eco-friendly solar power usage.
Versatile for various calculations.
Includes convenient writing tablet.
Main Highlights
Solar Scienticfic Calculator with LCD Writing Tablet: This scienticfic calculator has a built-in solar panel and durable battery, which can be used continuously for many years in indoor and outdoor environments, reducing the frequency of battery replacement and making it more economical. Come with a 4.4 inch writing tablet and a stylus pen, which allows you to take notes while calculating. You can press the delete button to erase the notes, repeat writing.
Powerful: This advanced scientific calculator has a total of 552 calculation functions with two-line display, easy to read and use, meets the needs of math, algebra, fractions, statistics, accounting and other aspects of the calculation; This portable professional scientific calculator helps you explore math and science concepts more easily.
Attentive design: This advanced scientitc calcuilator uk version has a solid sliding protective cover to protect buttons and device bodies; The button are made of plastic material, soft and easy to tap, and the digital font is clear. Our functional calculator are equipped with batteries, so you don't need to prepare the batteries before ordering.
Widely applicated: This note pad with calculator can meet the needs of most secondary and college level math courses, and can give better assistance in daily study; It can also be used for exams and can be given as a adorable gift to your children or friends, they will love it.
Package includes: 1X Black Scientific Calculator(batteries included) with 4.4 inch lcd writing pad, 2 pieces of instruction.
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9.1
Superb
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9.1
Superb
Peixiong
Peixiong FX991-EX Battery & Solar Powered Scientific Calculator with 4.4 Inches LCD Pad, FX-991EX Advanced Engineering/Scientific Calculator-552 Function with Notepad for School, Office (Black)
Check Price
Show More
Why we love it
Eco-friendly solar power usage.
Versatile for various calculations.
Includes convenient writing tablet.
Main Highlights
Solar Scienticfic Calculator with LCD Writing Tablet: This scienticfic calculator has a built-in solar panel and durable battery, which can be used continuously for many years in indoor and outdoor environments, reducing the frequency of battery replacement and making it more economical. Come with a 4.4 inch writing tablet and a stylus pen, which allows you to take notes while calculating. You can press the delete button to erase the notes, repeat writing.
Powerful: This advanced scientific calculator has a total of 552 calculation functions with two-line display, easy to read and use, meets the needs of math, algebra, fractions, statistics, accounting and other aspects of the calculation; This portable professional scientific calculator helps you explore math and science concepts more easily.
Attentive design: This advanced scientitc calcuilator uk version has a solid sliding protective cover to protect buttons and device bodies; The button are made of plastic material, soft and easy to tap, and the digital font is clear. Our functional calculator are equipped with batteries, so you don't need to prepare the batteries before ordering.
Widely applicated: This note pad with calculator can meet the needs of most secondary and college level math courses, and can give better assistance in daily study; It can also be used for exams and can be given as a adorable gift to your children or friends, they will love it.
Package includes: 1X Black Scientific Calculator(batteries included) with 4.4 inch lcd writing pad, 2 pieces of instruction.
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