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Best Casio Calculator Scientific Fx 991ex of 2026
Last updated on 03/04/2026
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1
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
Show More
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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Value for Money
2
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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3
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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9.7
Exceptional
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9.7
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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4
Casio ClassWiz Standard Scientific Calculators FX-991CW-PK-W-DT
Casio
Why we love it
High-definition and clear display.
User-friendly cursor operations.
Generate QR codes effortlessly.
Main Highlights
High-definition & 4-gradation display
Simple cursor-based operations and a key layout that follows the natural flow of use.
Easily select a calculator app from the Home screen that is suitable for the type of calculation that you want to perform.
Useful for learning statistics, recursive formulas, and more. Handles up to 5 columns x 45 rows (maximum of 170 data items).
Easily generate QR codes of equations input into the calculator. Graphs and other graphics can be displayed on smartphones or tablets.
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9.6
Superb
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9.6
Superb
Casio
Casio ClassWiz Standard Scientific Calculators FX-991CW-PK-W-DT
Check Price
Show More
Why we love it
High-definition and clear display.
User-friendly cursor operations.
Generate QR codes effortlessly.
Main Highlights
High-definition & 4-gradation display
Simple cursor-based operations and a key layout that follows the natural flow of use.
Easily select a calculator app from the Home screen that is suitable for the type of calculation that you want to perform.
Useful for learning statistics, recursive formulas, and more. Handles up to 5 columns x 45 rows (maximum of 170 data items).
Easily generate QR codes of equations input into the calculator. Graphs and other graphics can be displayed on smartphones or tablets.
Show More
5
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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9.6
Superb
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9.6
Superb
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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6
OSALO Scientific Calculator 552 Functions 4 Line Written Display Solar and Battery for School College Math Engineering Calculators Black (OS-991EX CW)
OSALO
Why we love it
Intuitive menu for easy navigation.
High-resolution display enhances clarity.
Designed for students' academic needs.
Main Highlights
【Intuitive Icon Menu & High-Resolution Display】Effortlessly navigate with a user-friendly icon-based menu and manage data via the built-in spreadsheet tool. The 4x higher-resolution display ensures crisp rendering of complex equations like integrals and matrices
【552 Advanced Functions】Master 552 functions including dynamic variable tables for real-time adjustments, matrix/vector operations, and calculus tools. Simplify work with over 50 preloaded scientific constants and unit conversions. No QR Functionality
【Written Display】Input expressions in Written Display format, with a multi-line screen showing input, steps, and results. This feature is convenient for students to check the calculation process and results. The LED backlight enhances visibility in dim environments for stress-free readability
【Perfect for High School and College Students】This scientific calculator caters to students from secondary school to university. Designed for most academic levels, it helps users tackle engineering mechanics, chemical reaction calculations, and biological data analysis with precision
【Answer Memory and Replay Function】With the answer memory feature, you can quickly retrieve and effortlessly reuse or edit previous formulas—whether working with complex equations or common calculations. Say goodbye to repeated input and enjoy a more streamlined, efficient experience
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9.5
Superb
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9.5
Superb
OSALO
OSALO Scientific Calculator 552 Functions 4 Line Written Display Solar and Battery for School College Math Engineering Calculators Black (OS-991EX CW)
Check Price
Show More
Why we love it
Intuitive menu for easy navigation.
High-resolution display enhances clarity.
Designed for students' academic needs.
Main Highlights
【Intuitive Icon Menu & High-Resolution Display】Effortlessly navigate with a user-friendly icon-based menu and manage data via the built-in spreadsheet tool. The 4x higher-resolution display ensures crisp rendering of complex equations like integrals and matrices
【552 Advanced Functions】Master 552 functions including dynamic variable tables for real-time adjustments, matrix/vector operations, and calculus tools. Simplify work with over 50 preloaded scientific constants and unit conversions. No QR Functionality
【Written Display】Input expressions in Written Display format, with a multi-line screen showing input, steps, and results. This feature is convenient for students to check the calculation process and results. The LED backlight enhances visibility in dim environments for stress-free readability
【Perfect for High School and College Students】This scientific calculator caters to students from secondary school to university. Designed for most academic levels, it helps users tackle engineering mechanics, chemical reaction calculations, and biological data analysis with precision
【Answer Memory and Replay Function】With the answer memory feature, you can quickly retrieve and effortlessly reuse or edit previous formulas—whether working with complex equations or common calculations. Say goodbye to repeated input and enjoy a more streamlined, efficient experience
Show More
7
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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9.3
Superb
Check Price
9.3
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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8
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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9.1
Superb
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9.1
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.
Show More
9
KBIBCK FX-991EX Scientific Calculator, 552 Functions Engineering Calculator Scientific with 10+2 Screen Displays, Portable Calculators for School Office Business Home Daily Use (Black)
KBIBCK
Why we love it
Powerful functionality for complex calculations.
High-resolution display enhances readability.
Durable design for long-lasting use.
Main Highlights
【Powerful Functionality】FX-991EX scientific calculator has 552 functions, capable of handling a wide range of tasks from basic arithmetic to complex matrix calculations, statistical analysis, and vector operations. Its responsive system delivers swift, accurate results, making it ideal for solving intricate problems efficiently at A-level, university, or professionally.
【High-Resolution Display】This FX-991EX scientific calculator features a 10+2 digit screen display, supporting the simultaneous display of multi-step formulas. You can verify data without frequently flipping through pages, ensuring that numbers, symbols, and graphs are clear and easy to read, presenting your calculation results clearly and sharply. The large screen improves readability and reduces eye strain, delivering a comfortable calculation experience.
【Durable Protection】The FX-991EX scientific calculator comes with a sturdy sliding hard case that not only protects the keys from scratches and damage, but also protects the calculator body, ensuring that the calculator remains in good condition for a long time. The plastic buttons are designed to be sensitive and comfortable to the touch, ensuring accurate input. Furthermore, these buttons are highly durable and will retain their functionality even after prolonged use.
【Convenient Power Supply】FX-991EX scientific calculator runs on readily replaceable button batteries (LR44 type included), providing stable and long-lasting power. Its compact and lightweight design makes it easy to carry and use anytime, anywhere, making it an ideal choice for students and professionals, especially suitable for carrying in a bag or on a desk.
【Wide Application】Whether it's algebra, physics, geometry, or related subjects such as GCSE, engineering calculator provides strong support and plays an important role in solving complex equations and performing statistical analysis. FX-991EX scientific calculator are ideal for efficiently solving complex problems in A-level exams, university studies, or professional fields.
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9.0
Superb
Check Price
9.0
Superb
KBIBCK
KBIBCK FX-991EX Scientific Calculator, 552 Functions Engineering Calculator Scientific with 10+2 Screen Displays, Portable Calculators for School Office Business Home Daily Use (Black)
Check Price
Show More
Why we love it
Powerful functionality for complex calculations.
High-resolution display enhances readability.
Durable design for long-lasting use.
Main Highlights
【Powerful Functionality】FX-991EX scientific calculator has 552 functions, capable of handling a wide range of tasks from basic arithmetic to complex matrix calculations, statistical analysis, and vector operations. Its responsive system delivers swift, accurate results, making it ideal for solving intricate problems efficiently at A-level, university, or professionally.
【High-Resolution Display】This FX-991EX scientific calculator features a 10+2 digit screen display, supporting the simultaneous display of multi-step formulas. You can verify data without frequently flipping through pages, ensuring that numbers, symbols, and graphs are clear and easy to read, presenting your calculation results clearly and sharply. The large screen improves readability and reduces eye strain, delivering a comfortable calculation experience.
【Durable Protection】The FX-991EX scientific calculator comes with a sturdy sliding hard case that not only protects the keys from scratches and damage, but also protects the calculator body, ensuring that the calculator remains in good condition for a long time. The plastic buttons are designed to be sensitive and comfortable to the touch, ensuring accurate input. Furthermore, these buttons are highly durable and will retain their functionality even after prolonged use.
【Convenient Power Supply】FX-991EX scientific calculator runs on readily replaceable button batteries (LR44 type included), providing stable and long-lasting power. Its compact and lightweight design makes it easy to carry and use anytime, anywhere, making it an ideal choice for students and professionals, especially suitable for carrying in a bag or on a desk.
【Wide Application】Whether it's algebra, physics, geometry, or related subjects such as GCSE, engineering calculator provides strong support and plays an important role in solving complex equations and performing statistical analysis. FX-991EX scientific calculator are ideal for efficiently solving complex problems in A-level exams, university studies, or professional fields.
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10
Jonuin FX-991EX Scientific Calculator, Scientific Calculator with 552 Functions, 10+2 Screen Displays, Scientific Calculators for Students Exams School Office Business Home Daily Use (Black)
Jonuin
10% Off
Why we love it
Versatile 552 functions.
Clear high-res display.
Protective sliding cover.
Main Highlights
【552 Functions Scientific Calculator】The FX-991EX scientific calculator features 552 functions, easily handling a full range of mathematical needs from basic arithmetic to matrix calculations, statistical analysis and vector operations. Its high-speed response system delivers fast results, efficiently solving various complex mathematical problems with strong practicality.
【High-resolution Display】Our FX-991EX scientific calculator features a 10+2 digit large screen display, presenting a clear calculation view with high resolution. The large screen enhances data readability, effectively relieves eye strain, and creates a comfortable and hassle-free user experience for various scenarios such as daily calculation, study and exam preparation.
【Come with Protective Cover】This FX-991EX scientific calculator is equipped with a sliding hard protective cover, which not only effectively shields the keys from scratches and damage but also protects the calculator body. It defends the entire calculator against injuries caused by accidental drops and impacts, providing all-round protection to keep the calculator in perfect condition for a long time and extend its service life.
【Sensitive Buttons】This FX-991EX scientific calculator features plastic keypad design with sensitive touch and smooth pressing, providing a reliable guarantee for accurate input. The keys are wear-resistant and maintain excellent operational performance even with long-term use, ensuring long durability.
【Convenient Power Supply】This FX-991EX scientific calculator is powered by button batteries (LR44 included). Battery replacement is simple, no frequent charging or solar power dependency required, ensuring a stable and long-lasting power supply for hassle-free and convenient daily use.
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9.0
Superb
Check Price
9.0
Superb
Jonuin
Jonuin FX-991EX Scientific Calculator, Scientific Calculator with 552 Functions, 10+2 Screen Displays, Scientific Calculators for Students Exams School Office Business Home Daily Use (Black)
10% Off
Check Price
Show More
Why we love it
Versatile 552 functions.
Clear high-res display.
Protective sliding cover.
Main Highlights
【552 Functions Scientific Calculator】The FX-991EX scientific calculator features 552 functions, easily handling a full range of mathematical needs from basic arithmetic to matrix calculations, statistical analysis and vector operations. Its high-speed response system delivers fast results, efficiently solving various complex mathematical problems with strong practicality.
【High-resolution Display】Our FX-991EX scientific calculator features a 10+2 digit large screen display, presenting a clear calculation view with high resolution. The large screen enhances data readability, effectively relieves eye strain, and creates a comfortable and hassle-free user experience for various scenarios such as daily calculation, study and exam preparation.
【Come with Protective Cover】This FX-991EX scientific calculator is equipped with a sliding hard protective cover, which not only effectively shields the keys from scratches and damage but also protects the calculator body. It defends the entire calculator against injuries caused by accidental drops and impacts, providing all-round protection to keep the calculator in perfect condition for a long time and extend its service life.
【Sensitive Buttons】This FX-991EX scientific calculator features plastic keypad design with sensitive touch and smooth pressing, providing a reliable guarantee for accurate input. The keys are wear-resistant and maintain excellent operational performance even with long-term use, ensuring long durability.
【Convenient Power Supply】This FX-991EX scientific calculator is powered by button batteries (LR44 included). Battery replacement is simple, no frequent charging or solar power dependency required, ensuring a stable and long-lasting power supply for hassle-free and convenient daily use.
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