---
product_id: 739609094
title: "Casio FX-991CW Engineering/Scientific Calculator - High Resolution Display, Solar Powered, Black"
brand: "casio"
price: "₨1351"
currency: LKR
in_stock: false
url: https://www.desertcart.lk/products/739609094-casio-fx-991cw-engineering-scientific-calculator-high-resolution-display-solar
store_origin: LK
region: Sri Lanka
---

# High-res 2.25" display Solar powered + battery backup 552 advanced functions Casio FX-991CW Engineering/Scientific Calculator - High Resolution Display, Solar Powered, Black

**Brand:** casio
**Price:** ₨1351
**Availability:** ❌ Out of Stock

## Summary

> 🧠 Elevate your calculations—because precision is the new power move.

## Quick Answers

- **What is this?** Casio FX-991CW Engineering/Scientific Calculator - High Resolution Display, Solar Powered, Black by casio
- **How much does it cost?** ₨1351 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/739609094-casio-fx-991cw-engineering-scientific-calculator-high-resolution-display-solar)

## 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

- • **Effortless Navigation:** Intuitive cursor keys and rounded keys make inputting data smooth and error-free—speed up your workflow.
- • **Seamless Digital Sync:** Compatible with ClassPad.net for easy data transfer and enhanced study or work collaboration.
- • **Power That Never Quits:** Solar-powered with LR44 battery backup ensures uninterrupted performance wherever you crunch numbers.
- • **Master of Math Functions:** 552 built-in functions including numeric integration, differentiation, and polynomial solvers for every engineering challenge.
- • **Crystal-Clear Visualization:** High-resolution display shows complex data and 4x4 matrices with textbook-perfect clarity.

## Overview

The Casio FX-991CW is a sleek, solar-powered scientific calculator featuring a high-resolution 2.25-inch LCD that displays textbook-style symbols and numbers. With 552 advanced functions including numeric integration, differentiation, and polynomial solvers, it’s designed for professionals and students who demand accuracy and efficiency. Its intuitive navigation, rounded keys, and compatibility with ClassPad.net make it a must-have tool for mastering complex calculations on the go.

## 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.

## Features

- High Resolution Display to view more data like spreadsheets and 4x4 matrix calculations
- Natural Text book display - symbols and numbers appear just as they do in textbook
- Numeric Integration/Differentiation. 552 functions
- Simultaneous and Polynomial Solver
- Solar Powered with Battery Backup (LR44 Button Cell Battery Included)
- Rounded keys for easier inputs
- 4-tone display makes operation easier
- Intuitive navigation with cursor keys
- Works with ClassPad.net

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Casio |
| Manufacturer | Casio |
| Model | FX-991CW |
| Model Name | FX-991CW |
| Product Dimensions | 16 x 7.62 x 0.25 cm; 94.97 g |
| Batteries | 1 LR44 batteries required. (included) |
| Item model number | FX-991CW |
| Number of items | 1 |
| Standing screen display size | 2.25 Inches |
| Display Type | LCD |
| Power Source | Solar Powered |
| Batteries Included | Yes |
| Batteries Required | Yes |
| Battery cell composition | Alkaline |
| Material | Plastic |
| Does it contain liquid? | No |
| Includes Rechargeable Battery | Yes |
| Manufacturer | Casio |
| Item Weight | 94.8 g |

## Product Details

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

## Images

![Casio FX-991CW Engineering/Scientific Calculator - High Resolution Display, Solar Powered, Black - Image 1](https://m.media-amazon.com/images/I/716Qoq3t58L.jpg)
![Casio FX-991CW Engineering/Scientific Calculator - High Resolution Display, Solar Powered, Black - Image 2](https://m.media-amazon.com/images/I/71cqAki4GuL.jpg)
![Casio FX-991CW Engineering/Scientific Calculator - High Resolution Display, Solar Powered, Black - Image 3](https://m.media-amazon.com/images/I/81hAm7XjKcL.jpg)
![Casio FX-991CW Engineering/Scientific Calculator - High Resolution Display, Solar Powered, Black - Image 4](https://m.media-amazon.com/images/I/61gxxLY81kL.jpg)
![Casio FX-991CW Engineering/Scientific Calculator - High Resolution Display, Solar Powered, Black - 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.

## 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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**Shop now:** [https://www.desertcart.lk/products/739609094-casio-fx-991cw-engineering-scientific-calculator-high-resolution-display-solar](https://www.desertcart.lk/products/739609094-casio-fx-991cw-engineering-scientific-calculator-high-resolution-display-solar)

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*Product available on Desertcart Sri Lanka*
*Store origin: LK*
*Last updated: 2026-02-23*