---
product_id: 639197219
title: "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: "€ 41.56"
currency: EUR
in_stock: true
reviews_count: 8
category: "Casio"
url: https://www.desertcart.gr/products/639197219-fx-991cw-advanced-scientific-calculator-with-high-res-4-tone
store_origin: GR
region: Greece
---

# 540+ advanced functions solar powered + battery backup 4-tone high-res display 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:** € 41.56
**Availability:** ✅ In Stock

## Summary

> 📐 Elevate your calculations with precision and style—because your work deserves the best.

## Quick Answers

- **What is this?** 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?** € 41.56 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/639197219-fx-991cw-advanced-scientific-calculator-with-high-res-4-tone)

## 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

- • **QR Code Graphing:** Scan and visualize results on ClassPad.net—next-level interactive learning.
- • **Memory & Math Catalog:** Store up to 9 variables and access 87 constants & conversions instantly.
- • **540+ Advanced Functions:** From numeric calculus to matrix solving, master complex problems effortlessly.
- • **Natural Textbook Display:** See equations exactly as in your textbooks—no more guesswork or errors.
- • **High-Resolution 4-Tone Display:** Quad-shade screen enhances clarity and cursor tracking for seamless editing.

## Overview

The Casio fx-991CW is a top-tier scientific calculator featuring a crisp 4-tone high-resolution display and over 540 advanced functions including numeric integration, differentiation, and matrix operations. Designed for engineering, science, and exam use, it offers a natural textbook display for intuitive input, memory storage for up to 9 variables, and QR code functionality for graphing on ClassPad.net. Lightweight, solar-powered with battery backup, and built with durable materials, it’s the trusted choice for students and professionals aiming for 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: Sooo many functions and very low price - I bouught this for College Chemistry for Health Professions as a back-up to the first one (same exact one) I just bought within the past week. I LOVE this so much! It has so many functions and is so lightweight. Someone said the weight makes it feel cheap, but it is definitely NOT a cheap type of calculator. You would also think that it's "cheap", due to the low price, but this is the best scientific calculator I've ever had (and I've bought those TI ones in the past that were almost $100).

## 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 | #3,860 in Office Products ( See Top 100 in Office Products ) #9 in Scientific Calculators |
| Brand | Casio |
| Calculator Type | Engineering/Scientific |
| Color | Black |
| Customer Reviews | 4.8 out of 5 stars 1,939 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 |
| Model Name | FX-991CW |
| Number of Batteries | 1 LR44 batteries required. (included) |
| Power Source | Solar Powered |
| Screen Size | 2.25 Inches |
| UPC | 889232615011 |
| Unit Count | 1.0 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

![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)

## 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.

### ⭐⭐⭐⭐⭐ Sooo many functions and very low price
*by A***. on January 19, 2026*

I bouught this for College Chemistry for Health Professions as a back-up to the first one (same exact one) I just bought within the past week. I LOVE this so much! It has so many functions and is so lightweight. Someone said the weight makes it feel cheap, but it is definitely NOT a cheap type of calculator. You would also think that it's "cheap", due to the low price, but this is the best scientific calculator I've ever had (and I've bought those TI ones in the past that were almost $100).

### ⭐⭐⭐⭐⭐ Great for physics and Algebra
*by M***R on November 10, 2025*

Great calculator, easy to understand, amazing functions, im uding it fot mu physics class and it is perfect for it.

## 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 Greece*
*Store origin: GR*
*Last updated: 2026-02-01*