Attributes

Brand	-
Category	Stationery, Educational Electronics & Office Supplies / Calculators
Origin	-
Brand	Casio
Model Number	FX-991CN CW II
Display Type	High-resolution LCD with Natural Textbook Display
Power Source	Solar Panel with Button Battery Backup
Number of Functions	552+
Memory Registers	9 Variables + Independent Memory
Dimensions	165.5 x 77 x 11.1 mm
Weight	Approx. 105g
Warranty	1 Year Manufacturer Warranty
Country of Origin	Thailand

6 reviews

Anonymous

Mar 27, 2026

Rating: 5/5

Best upgrade from the FX-991ES

I upgraded from the ES model and the difference in display clarity is night and day. Solving systems of equations and vector calculations is intuitive. The build quality feels sturdy and the keys have a nice tactile feedback.

Anonymous

Mar 23, 2026

Rating: 5/5

Clear screen and fast processing

The screen resolution is fantastic, especially when viewing fractions and calculus symbols. It processes long calculations instantly without lag. Very happy with this purchase for my chemistry lab work.

Anonymous

Mar 23, 2026

Rating: 4/5

Great features, slight learning curve

This calculator is powerful and approved for most entrance exams. The icon-based menu is modern but requires some time to memorize where specific functions are located. Once you learn it, it's very fast. Battery life seems excellent so far.

Anonymous

Mar 16, 2026

Rating: 5/5

Essential for Graduate Studies

As a grad student in statistics, I need reliable computation tools. This Casio model handles probability distributions and regression analysis effortlessly. The QR code function to visualize graphs on a smartphone is a neat bonus feature.

Anonymous

Mar 13, 2026

Rating: 4/5

Solid performer for exams

Bought this for my son's university entrance prep. It is non-programmable so it complies with strict exam rules. The only downside is that the manual could be more detailed regarding the new CW interface, but online tutorials help.

Anonymous

Mar 04, 2026

Rating: 5/5

Perfect for University Physics

The new menu interface takes a little getting used to compared to the older ES Plus models, but the high-resolution screen makes reading complex equations much easier. It handles matrix calculations and integrals smoothly. Highly recommended for engineering students.

5 FAQ

Q: Is this calculator allowed in SAT and AP exams?

A: Yes, the Casio FX-991CN CW II is generally permitted for SAT, ACT, and AP exams as it is a non-programmable scientific calculator. However, we always recommend checking the specific regulations of your testing center before the exam day.

Q: Can it solve differential equations symbolically?

A: No, this model performs numerical integration and differentiation but does not support symbolic algebra (CAS) capabilities. It provides numerical approximations for derivatives and integrals.

Q: What is the difference between this and the FX-991EX?

A: The CW II features a newer icon-based menu system and a higher resolution LCD screen compared to the EX model. It also has updated internal processing for faster calculations and an improved user interface design.

Q: How do I reset the calculator if the menu gets confusing?

A: You can initialize the settings by pressing [Home], selecting [Settings], then [Reset], and choosing 'Initialize All Data'. Please note this will clear all stored variables and memory contents.

Q: Does it come with a protective hard case?

A: The package typically includes a slide-on hard protective case designed specifically for the FX-991CN CW series to protect the screen and buttons during transport.

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