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Casio FX991ES Scientific

(12 Digit)
Price: Not Available

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RetailNet 4.3 / 5
83% positive feedback (1,163 ratings)
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Casio FX991ES Scientific (12 Digit) Price: Rs. 845

Casio Calculators provide quick and easy results and are widely used by businessmen and students around the world. The Casio FX991ES is a scientific calculator with a Full Dot Matrix Natural Textbook Display. The screen is wide and spacious and this calculator has plastic keys, which are designed and engineered for easy operation.

Body and Power

The Casio FX991ES has multiple abilities and is capable of performing 403 functions in all. This calculator has a 10-digit mantissa + 2-digit exponential display with an AAA size R03 battery.

Complex mathematical calculations such as integration, differential equations, matrix and vector calculations, complex number calculation, CALC function, SOLVE function, base-n calculation. Sin, cos and tan functions help solve geometrical problems easily at the click of a few buttons.

Intricate steps to obtain results for other algebraic conversations such as fractions, permutation and combination, standard deviation, table function etc. can be avoided since the user-friendly built of this Casio Calculator makes it easy to get quick results to these operations. Market researchers, data collectors and data analysts can easily carry out paired -variable statistics regression analysis, standard deviation and other operations related to organized collection and preservation of data using this Casio FX991ES. The List-based STAT data editor makes viewing and editing of input data in list format and shows data groups with x-data, y-data and frequency and surrounding data.

The Multi-replay function makes it easy to obtain quick and easy recall of previously executed formulas for editing and re-execution. The Dot Matrix Display features a high-resolution screen, providing beautiful looking graphs every time.

Logarithmic log, table function and logical operations make calculations easy, quick and convenient. This Casio Calculator has 40 stored scientific constants, which come into effect while carrying out these calculations. Data and information is stored on 9 variable memories and there are 20 pairs of metric conversions available.

The two way power system is capable of using battery as well as solar power for the calculator thus making optimum usage. This Casio Calculator comes with a new slide on hard case, which makes working on the calculator convenient and protects it from scratches and other impacts.

With its wide variety of features and specifications, this Casio FX991ES is used extensively by students and other professionals in course of their daily routine. The user-friendly and budget-friendly nature of this Casio Scientific Calculator makes it a good buy.

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Specifications of Casio FX991ES Scientific (12 Digit)

Display (Digits) 12
Type Scientific
Brand Name Casio
Model No FX991ES
Power Source Battery and Solar
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Reviews of Casio FX991ES Scientific (12 Digit)


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Based on 218  ratings

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Sheshadri T R

Dec 18, 2013

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Serves the purpose, too good for me!!

Flipkart's best service and Casio's best product quality.
I bought this for my examination purpose, and this is the highest programmable calculator they had allowed into exam hall that time.

But this calculator has more functionality and its predecessor FX900. Worth the price !!
A s…
(View complete review)


Aug 27, 2012

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Best in class

this is the best calculator an engineer as well a CA aspirant can have..I had a MS990 earlier but when I got this I got amazed of the display. the double line display is good..and the keys are the best in its catagory

Shivani Agarwal

Aug 6, 2012

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Notebook entry display

Useful for students preparing for engineering or other maths based exams. It saves lot of time involved in lengthy calculations. The screen is big having notebook type entry facility.
Can be used as a gift item also.

Shalabh Tayal

Aug 5, 2012

awesome one !!!!

I have been using this calculator for over four years and it had the capacity to do whatever I wanted it to do and more - you name it and that function is there...

the main difference between this calculator and the other is the 'naturaL display'.It lets you enter the fractions ,brackets or…
(View complete review)

S. Chatterjee

Aug 4, 2012

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certified buyer

Awesome is the only word for the complete package

5 start fro the product and for the service provider. Cheaper that anywhere in India. A genuine product will all papers. Unfortunately, the educators in India do not allow usage of these devices in school or collages. They think students will learn the best by doing never-ending manual calculations … (View complete review)

Top reviews

View all top reviews(35)

'Top Reviews' lists the most relevant product reviews only. Show ALL instead?


Debarun Majumdar

Dec 11, 2011

991ES is gr8 calc for engg. students .... its a steal at this price

I have been using the Casio FX991ES for the past 4 yrs. Its a gr8 device for engg. students. The greatest feature is the natural notebook display which allows the user to write fractions and functions in a natural manner.
For just 100-150 bucks more than the 991MS model its a significant improvement with more memory, larger display, gr8tr function(ex:log10 and u can store stat tables) and easy and quick operations (very helpful during exams).
Bottomline: go for it !!!!

Ashok sahu

Nov 22, 2011


Best calculator i have ever used. natural notebook dishplay makes easy to write fraction,solution of equations, matrix,integration, differentiation etc.
user friendly platform
it has memory to store values
must buy

Saurabh Sinha

Nov 23, 2011

Best for Engineering students

I felt that it is the best klc for engineering students @ very affordable price with trust of flipkart.
Its operations are user friendly & provides much graphical interface.
I bought it 4 years before @ 620/-


Vivek Todi

May 3, 2012

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Worth the money.

Now of course Flipkart is always the best! I've been a regular customer and never have they let me down. Rock bottom prices and lightning speed deliveries!

The Casio FX991ES is master piece. Once you start using it to the max, you realize that the returns are many times higher than what you paid to buy it!

The natural number display, the plethora of functions and the smooth finish of the product make you a proud owner of one of the finest pieces of technology.

Must have for most of the students. But beware that official university exams do not permit the use of these models in the examinati

Vamsi Chivukula

May 4, 2012

Paisa Vasool

I've been using this calculator for 2 years and had no issues with it so far. It is an excellent product from casio.
1. textbook display which makes entering fractions very easy.
2. flexible matrix operations.
3. conversion tables provided on the cover panel.

1. Takes time while calculating complex equations. Especially while solving interpolation problems and numerical integration (taylor series, simpsons' rules etc.)
2. max order of the matrix is 3x3.


VamsiMohanKrishna Vadrevu

Aug 5, 2012

An Engineer's life depends on how well his calculator works.

This calculator is like a perpetual motion machine. It never needs a battery! (Although I did get the battery that came with it after six months of purchase). Since then, There has been no battery issue. In first six months of Engineering, we don't use the calculator that much, but the battery needed to be replaced. But after that, I have been using it extensively (to the point of doing calculations like 15+7=22 :P along with the engineering functions

The most useful functions for engineering students are
1. Integration
2. Differentiation (only definite integrals and differentials)
3. Equatio

Biplab Roy

Apr 28, 2012

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extremely useful

purchased this item 2 weeks ago. working fine. the solar charge pannel is really good. no tension for changing the battery. best buy for engineers & technical students. key buttons are hard plastick made & rigid. good stuff overall.

Pratik Patel

Mar 1, 2012

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Best for Engineer..!!!

One of the best calculator in the current market for engineers and I'll give 5 out of 5...!!!
It has enough functions which assist in your examination..!!!
But some of the university and colleges doesn't allow this series calculator in exam..!!!

shihora hardik

Feb 25, 2012

this product is so good

this product is good but this product price is high in my nearer shop. this product is useful of the all engineering students. this calculator is use of to matrix multiplication and matrix diterminets and this products is so good for all engineering students.

Adithya kalliath

Dec 29, 2011

the one for engg students

i have used this calc for the past 3 years...really amazing has easy to use functions like equations,matrices,solve func this makes engg calculations piece of cake....a definite must buy product
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