---
product_id: 63118167
title: "Casio FX-991ES / FX-991-ES-PLUS Calculator"
brand: "casio"
price: "฿311"
currency: THB
in_stock: false
reviews_count: 8
url: https://www.desertcart.co.th/products/63118167-casio-fx-991es-fx-991-es-plus-calculator
store_origin: TH
region: Thailand
---

# Casio FX-991ES / FX-991-ES-PLUS Calculator

**Brand:** casio
**Price:** ฿311
**Availability:** ❌ Out of Stock

## Quick Answers

- **What is this?** Casio FX-991ES / FX-991-ES-PLUS Calculator by casio
- **How much does it cost?** ฿311 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/63118167-casio-fx-991es-fx-991-es-plus-calculator)

## Best For

- casio enthusiasts

## Why This Product

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

## Description

Casio fx-991es scientific pocket calculator

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Casio |
| Brand | Casio |
| Model Number | 271239 |
| Product Dimensions | 8 x 16.4 x 1.22 cm; 105 g |
| Batteries | 1 Lithium Ion batteries required. (included) |
| Colour | silver |
| Material Type | Plastic |
| Binding Edge | office_product |
| Number of Items | 1 |
| Manufacturer Part Number | FX-991ES |
| Item Weight | 105 g |

## Product Details

- **Brand:** Casio
- **Colour:** silver
- **Calculator Type:** Engineering/Scientific
- **Power source:** Battery Powered
- **Number of batteries:** 1 Lithium Ion batteries required. (included)
- **Model name:** FX-991ES
- **Material:** Plastic
- **Compatible devices:** Any device with display or input capability
- **Display type:** LCD
- **Global Trade Identification Number:** 04971850167037

## Images

![Casio FX-991ES / FX-991-ES-PLUS Calculator - Image 1](https://m.media-amazon.com/images/I/61brq8LPK2L.jpg)
![Casio FX-991ES / FX-991-ES-PLUS Calculator - Image 2](https://m.media-amazon.com/images/I/61fhnkp0JDL.jpg)

## Questions & Answers

**Q: Does the FZ-991ES PLUS have anything over this model? I prefer the way this model looks.**
A: I think it is better to ask this question on the FZ-991ES PLUS page instead of here? Users with this model don't tend to own the Plus model.

**Q: can you use in edexcel exams?**
A: I used this in GCSE, A level and degree exams.

**Q: Does this have Base-N mode?**
A: Yes the Casio FX-991ES has  base-N Mode. You can download the instruction booklet in PDF format (Google it) and check before you commit.

**Q: Will this calculator solve quadratics? By this I mean will the calculator factorise quadratics? Thanks!**
A: yes

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excellent Product
*by A***N on 27 February 2011*

This is an excellent calculator for the price. It offers great value for money as it has a wide range of options. I would have preferred it if there were more generic modes e.g. as opposed to having a mode for complex numbers and a separate mode for general computation however that is the only real fault I can find, but you get used to skipping through the menus soon enough. Recommended for A levels to uni work.

### ⭐⭐⭐⭐⭐ YES Best calculator for A level Maths, Physics, Further maths
*by L***S on 7 June 2014*

Best calculator for A level Maths, Physics, Further maths, I use it all the time, It is great for imaginary numbers, On Edexcel AS, FP1 you can practically use the calculator to answer a question,(Warning mathsy talk ahead..)It has been useful to me for:- Finding imaginary number Times and division- Modulus of an imaginary number- Argument of an imaginary number- Solving quadratic and cubic equations- Integrating between boundsAnd more! Great for the leap between GCSE and A level.

### ⭐⭐⭐⭐ low cost, high features
*by C***A on 12 December 2008*

What a bargain! this calculator does so much for so little outlay. you have to spend a small fortune to get an HP calc to do the same thing. Solar powered, with battery back up. This calc can work on equation input as well as conventional notation, it will also do matrices and solve differentials and integral (I think). I have yet to explore everything, but it does a lot of what I need, and I design jet engines for a living. It looses one point due to cheap plastics and an awkward case, but it acceptable given the price. Also the manual is rather poor compared to the spiral bound tomes that come with an HP, but again this reflects the price.

## Frequently Bought Together

- Casio FX-991ES / FX-991-ES-PLUS Calculator
- Casio fx-991ES Plus 2 Scientific Calculator with 417 Functions and Display, Natural
- (Spanish Version) Casio FX-991ES Plus-2nd Edition Scientific Calculator

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**Shop now:** [https://www.desertcart.co.th/products/63118167-casio-fx-991es-fx-991-es-plus-calculator](https://www.desertcart.co.th/products/63118167-casio-fx-991es-fx-991-es-plus-calculator)

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*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-03-07*