---
product_id: 639197219
title: "Casio fx-991CW– Advanced Scientific Calculator with High-Res 4-Tone Display | Natural Textbook Display | 540+ Functions, Numeric Calculus, Matrix Solver | Ideal for Engineering, Science & Exams"
brand: "casio"
price: "€ 4.11"
currency: EUR
in_stock: false
reviews_count: 13
url: https://www.desertcart.sk/products/639197219-casio-fx-991cw-advanced-scientific-calculator-with-high-res-4
store_origin: SK
region: Slovakia
---

# 540+ advanced functions solar powered + long-lasting memory 4-tone high-res display Casio fx-991CW– Advanced Scientific Calculator with High-Res 4-Tone Display | Natural Textbook Display | 540+ Functions, Numeric Calculus, Matrix Solver | Ideal for Engineering, Science & Exams

**Brand:** casio
**Price:** € 4.11
**Availability:** ❌ Out of Stock

## Summary

> 📐 Elevate your calculations—where precision meets professional edge.

## Quick Answers

- **What is this?** Casio fx-991CW– Advanced Scientific Calculator with High-Res 4-Tone Display | Natural Textbook Display | 540+ Functions, Numeric Calculus, Matrix Solver | Ideal for Engineering, Science & Exams by casio
- **How much does it cost?** € 4.11 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/639197219-casio-fx-991cw-advanced-scientific-calculator-with-high-res-4)

## Best For

- casio enthusiasts

## Why This Product

- Trusted casio brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Crystal Clear Visuals:** High-resolution 4-tone LCD enhances visibility and cursor tracking for seamless editing.
- • **Powerhouse Performance:** 540+ advanced functions including numeric calculus, matrix operations, and spreadsheet-style data.
- • **Smart Memory & Catalog:** Store up to 9 variables persistently and access 87 constants & conversions instantly.
- • **See Math Like Never Before:** Natural Textbook Display mirrors textbook equations for flawless comprehension and fewer errors.
- • **Exam-Ready Durability & Connectivity:** Non-slip case, rounded keys, plus QR code graphing to sync with ClassPad.net.

## Overview

The Casio fx-991CW is a solar-powered advanced scientific calculator featuring a high-resolution 4-tone natural textbook display, over 540 functions including numeric calculus and matrix solving, persistent memory for up to 9 variables, and QR code connectivity for graphing on ClassPad.net. Designed for engineering, science, and exam use, it combines durability with cutting-edge tech to boost accuracy and efficiency.

## Description

A high performance scientific calculator with high resolution display increasing the amount of information displayed and super fast calculation speed for testing or performing the most advance mathematics. High resolution LCD screen allows viewing of more information like spreadsheets and 4x4 matrix calculations. This calculator has a comprehensive set of advanced calculations for integration & differential calculus, along with vector and inequality calculations. For middle school, high school and college math courses.

Review: Excellent calculator with great features - The Casio fx-991CW is an excellent calculator with very good performance and a wide range of useful features. It is easy to use, fast, and well designed, making it perfect for students and professionals who need reliable calculations. The display is clear and the overall build quality feels solid and durable. I also want to highlight that the desertcart delivery time was reasonable, especially considering that this was an international transaction. The product arrived well packaged and in perfect condition. Overall, I am very satisfied with this purchase and would definitely recommend this calculator.
Review: This product is excellent - These calculators are excellent. my wife and I are engineering students and decided to try them. they are excellent for classes and exams, with so many functions, like vectors, equations, inequations... so we totally recommend them. They are very easy to learn how to use. and they offer great value for the price.

## Features

- NATURAL TEXTBOOK DISPLAY – View equations, fractions, and symbols exactly as they appear in textbooks for better comprehension and reduced errors.
- HIGH-RESOLUTION 4-TONE DISPLAY – Enhanced screen with quad-tone shading improves visibility and makes cursor tracking easy when writing and editing expressions.
- MEMORY & MATH CATALOG – Store and recall up to 9 variables containing integers, computations, and functions. Memory persists between sessions—an educator-requested feature. Access 47 constants, 40 conversions, advanced math functions, and more through the intuitive Math Catalog.
- 540 ADVANCED FUNCTIONS – Perform numeric integration and differentiation, 4x4 matrix operations, spreadsheet-style data viewing, and more.
- QR FUNCTIONALITY & DURABLE DESIGN – Scan QR codes to graph results on ClassPad.net; includes rounded keys and a non-slip hard case for classroom or exam use.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BSJ33C4R |
| Best Sellers Rank | #85,488 in Office Products ( See Top 100 in Office Products ) #88 in Scientific Calculators |
| Brand | Casio |
| Calculator Type | Engineering/Scientific |
| Color | Black |
| Customer Reviews | 4.7 out of 5 stars 2,187 Reviews |
| Display Type | LCD |
| Enclosure Material | Plastic |
| Item Dimensions L x W | 6.3"L x 3"W |
| Item Type Name | Casio Advanced Scientific Calculator |
| Item Weight | 3.35 ounces |
| Manufacturer | Casio |
| Mfr Part Number | FX-991EX |
| Model Name | FX-991CW |
| Model Number | FX-991CW |
| Number of Batteries | 1 LR44 batteries required. (included) |
| Power Source | Solar Powered |
| Screen Size | 2.25 inches |
| UPC | 889232615011 |
| Unit Count | 1 Count |
| Warranty Description | 1 year limited manufacturer |

## Product Details

- **Brand:** Casio
- **Calculator Type:** Engineering/Scientific
- **Color:** Black
- **Power Source:** Solar Powered
- **Screen Size:** 2.25 Inches

## Images

![Casio fx-991CW– Advanced Scientific Calculator with High-Res 4-Tone Display | Natural Textbook Display | 540+ Functions, Numeric Calculus, Matrix Solver | Ideal for Engineering, Science & Exams - Image 1](https://m.media-amazon.com/images/I/716Qoq3t58L.jpg)
![Casio fx-991CW– Advanced Scientific Calculator with High-Res 4-Tone Display | Natural Textbook Display | 540+ Functions, Numeric Calculus, Matrix Solver | Ideal for Engineering, Science & Exams - Image 2](https://m.media-amazon.com/images/I/71cqAki4GuL.jpg)
![Casio fx-991CW– Advanced Scientific Calculator with High-Res 4-Tone Display | Natural Textbook Display | 540+ Functions, Numeric Calculus, Matrix Solver | Ideal for Engineering, Science & Exams - Image 3](https://m.media-amazon.com/images/I/81hAm7XjKcL.jpg)
![Casio fx-991CW– Advanced Scientific Calculator with High-Res 4-Tone Display | Natural Textbook Display | 540+ Functions, Numeric Calculus, Matrix Solver | Ideal for Engineering, Science & Exams - Image 4](https://m.media-amazon.com/images/I/61gxxLY81kL.jpg)
![Casio fx-991CW– Advanced Scientific Calculator with High-Res 4-Tone Display | Natural Textbook Display | 540+ Functions, Numeric Calculus, Matrix Solver | Ideal for Engineering, Science & Exams - Image 5](https://m.media-amazon.com/images/I/81IcKs9I-IL.jpg)

## Questions & Answers

**Q: Can it handle complex numbers in matrix ?**
A: Yes. .or say within reason. Download the manual from Casio, its free and you dont need to buy calculator.. Look at page 114 and 107. Make sure you download fx-991CW...not fx-991.

**Q: ¿Este artículo tiene garantía?**
A: Good afternoon,

I bought the calculators without a guarantee, but I really don't know if the product has a guarantee, although they should have a guarantee.

Regards,
AC.

**Q: when you turn off the calculator, the calculation history is deleted or not?**
A: The data is deleted when you turn it off.  It's the only thing that keeps it from being the perfect scientific calculator for me.

**Q: is there a ohms law calculator?**
A: Well any calculator can "do" Ohms law. If ypur worried about remembering it, any programming calculator can store formulas for you...Calculated Industries (yellow calculators) makes 2 Electrical calculators, pretty sure both have Ohms law function key.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excellent calculator with great features
*by F***O on December 29, 2025*

The Casio fx-991CW is an excellent calculator with very good performance and a wide range of useful features. It is easy to use, fast, and well designed, making it perfect for students and professionals who need reliable calculations. The display is clear and the overall build quality feels solid and durable. I also want to highlight that the Amazon delivery time was reasonable, especially considering that this was an international transaction. The product arrived well packaged and in perfect condition. Overall, I am very satisfied with this purchase and would definitely recommend this calculator.

### ⭐⭐⭐⭐⭐ This product is excellent
*by S***S on February 6, 2026*

These calculators are excellent. my wife and I are engineering students and decided to try them. they are excellent for classes and exams, with so many functions, like vectors, equations, inequations... so we totally recommend them. They are very easy to learn how to use. and they offer great value for the price.

### ⭐⭐⭐⭐⭐ Casio classwiz fx-991CW in University Life
*by A***R on February 2, 2025*

A semester in the calculator works well, buttons are tactile and responsive. The main quality of life improvements u notice is the surd function and fractional answers, the fact u can modify the display to suit ur eyes, accuracy is a plus and its durability. The calculator interface is refreshing, readability is eased . Its great value given the graphing function although accessed through ur phone on a website with the QR. The school use is exceptional, and relevant to my Pre Engineering classes and would be using it for my further degree. However in exam time they did call my casio calculator a semi-programmable, had to pull out my sharp and dust off the codes and functions I memorized. The examiners allowed the older model casio class Wiz which is more button oriented than this one which is screen oriented. 🤔 given a university scenario I did have my doubts on that exam certified. If anything I'll invest in the older model casio class wiz. As well

## Frequently Bought Together

- Casio fx-991CW– Advanced Scientific Calculator with High-Res 4-Tone Display | Natural Textbook Display | 540+ Functions, Numeric Calculus, Matrix Solver | Ideal for Engineering, Science & Exams
- Texas Instruments TI-36X Pro Engineering/Scientific Calculator | 9.7 Inch | Black.

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-08-10*