Description
Reviews
| Brand | - |
| Category | Stationery, Educational Electronics & Office Supplies / Calculators |
| Origin | - |
| Brand | Casio |
| Model Number | FX-991CN X / CW |
| Display Type | High-resolution LCD with Natural Textbook Display |
| Power Source | Solar + Battery (LR44) |
| Number of Functions | 552+ |
| Memory Slots | 9 Variables + Independent Memory |
| Language Support | Chinese and English Menu |
| Dimensions | 165.5 x 77 x 11.1 mm |
| Weight | Approx. 105g (with battery) |
| Warranty | 1 Year Manufacturer Warranty |
Anonymous
Mar 22, 2026
Rating: 5/5
Best investment for grad school
As a graduate student in economics, I need reliable tools. This Casio model never fails me. The spreadsheet function is surprisingly powerful for quick data analysis without needing a laptop.
Anonymous
Mar 19, 2026
Rating: 5/5
Essential for Chemistry Competitions
Used this during a national chemistry competition. The statistical features and unit conversions saved me so much time. It's robust and fits comfortably in the hand during long exam sessions.
Anonymous
Mar 17, 2026
Rating: 4/5
Good value, steep learning curve
The calculator does everything advertised, but the icon-based menu requires some practice if you are coming from older button-heavy models. Once mastered, it is incredibly efficient. Build quality feels premium.
Anonymous
Mar 11, 2026
Rating: 4/5
Solid upgrade from the old model
The transition from the X series to the CW took a little time because the interface is different, but the functionality is superior. It solves integrals and derivatives quickly. Just wish the manual was more detailed in English.
Anonymous
Mar 09, 2026
Rating: 5/5
Perfect for CPA Exams
This calculator is approved for the CPA exam and handles complex financial calculations effortlessly. The menu system in the CW version is very intuitive once you get used to it. Highly recommended for accounting students.
Anonymous
Mar 04, 2026
Rating: 5/5
Great for University Physics
I bought this for my engineering physics course. The matrix and vector operations are fast, and the display is crisp enough to read complex equations clearly. Battery life is excellent thanks to the solar panel.
Q: Can it solve systems of linear equations with 4 variables?
A: Yes, the Equation/Func mode supports solving simultaneous linear equations with up to 4 unknowns, as well as polynomial equations up to the 4th degree.
Q: What is the difference between the X and CW versions mentioned in the title?
A: The 'X' refers to the previous generation (FX-991EX) which uses a traditional button menu, while the 'CW' (ClassWiz) is the newer generation with an icon-based navigational interface and higher resolution display. Both share similar calculation capabilities, but the user interface differs significantly.
Q: Is this calculator allowed in the CFA or CPA exams?
A: Yes, the Casio FX-991CN X/CW is generally permitted in CPA exams. However, CFA Institute has a specific list of approved models; please verify the current year's policy as they often require specific non-programmable models. This model is non-programmable and usually compliant for most standard accounting boards.
Q: How long does the battery typically last with regular daily use?
A: With regular daily use in a well-lit environment, the combination of solar power and the backup LR44 battery typically lasts over 2 to 3 years. If used primarily in low-light conditions, the battery may need replacement sooner, approximately every 1-2 years.
Q: Does the package include a protective hard case?
A: The standard package includes a slide-on hard protective case that covers the screen and keypad when not in use. A separate carrying pouch is not included but can be purchased separately.
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