Casio fx-991ES Scientific Calculator - 403 Functions UK's No.1

The UK's No.1 Scientific Calculator Brand — Now in Your Hands.

The Casio fx-991ES Scientific Calculator is the trusted choice of students and professionals worldwide. Recognised as the UK's No.1 Scientific Calculator Brand, it combines powerful functionality with an intuitive design that makes complex maths feel manageable.

With 403 functions, a crisp 2-line display, and a built-in STAT-Data Editor, this calculator handles everything from basic arithmetic to advanced statistics, fractions, and trigonometry. Powered by both solar and battery (Two Way Power), it works reliably in any environment — bright classrooms or dimly lit exam halls.

Key Features

• 403 functions — covering algebra, statistics, trigonometry, and more
• 2-Line Display — see your input and result simultaneously for easy checking
• STAT-Data Editor — enter and edit statistical data with ease
• Natural V.P.A.M. — displays expressions naturally as written in textbooks
• Two Way Power — solar + battery for uninterrupted use anywhere
• Silver and black durable body with clearly labeled keys
• Comes in original Casio green retail box packaging

Trusted by millions. Built for every exam. The Casio fx-991ES is the calculator that never lets you down.