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The advanced Casio FX991ES Plus scientific calculator will see you through both your academic study (suitable for Key Stage 3, 4 and above) and your professional life. With a slide on protective hard case this battery powered scientific calculator fulfils all your basic mathematical functions, whilst also being able to show recurring decimals and prime factors.

- Advanced scientific.
- Natural V.P.A.M. Textbook Display - displays as written in a mathmatical textbook .
- Suitable for GCSE, A level and above.
- 2 line large LCD display.
- 9 data memory.
- Non-stick keys.
- Auto shut-off.
- 417 functions.
- Function menu system.
- Table of function values.
- Recurring decimals.
- Verify function.
- Prime factorisation.
- Algebraic logic.
- Regression analysis.
- Statistical functions.
- Hyperbolic.
- 24 levels of parenthesis.
- Metric conversions.
- Slide-on hard case.
- Dual power source - solar and battery.

General information:

- Batteries required 1 x LR44 (included).
- Manufacturer's 3 year guarantee.
- EAN/MPN/UPC/ISBN: 4971850182276.

Overall rating:

4.8

/ 5

(65 reviews) 48
Rating breakdown 65 reviews

5 Stars

51

4 Stars

12

3 Stars

2

2 Stars

0

1 Star

0

63 of 6597%would recommend to a friend

Sort by
Customer reviews for Casio FX991ES Plus Scientific Calculator.

Review 1 for Casio FX991ES Plus Scientific Calculator.

Overall rating

5
/
5

A MIGHTY LITTLE THING

Posted11 June 2013

By malglu

From:uk

Age:35 to 44

Gender:Female

" this has amazing capabilities, and would be great for a post GCSE student. might be too sophisticated for a GCSE student, and most of the features are unnecessary, so only advise you to buy this as a teenager if you know you want to do further education in maths. that will give you plenty of time to learn how to use this calculator. i am enjoying be able to put in fractions! this is a novelty for me! i think the model under this aslso has this feature.
"

Yes, I recommend this product.

Review 2 for Casio FX991ES Plus Scientific Calculator.

Overall rating

4
/
5

Great for A-Level Maths

Posted08 June 2013

By Sam,

From:West Yorkshire

Age:18 to 24

Gender:Male

" Contains lots of very complex functions that you would never use at A-Level but the inclusion of more letters, in the form of constants, means you can write lots humorous messages and show off to your friends.

Despite its functions not being of much use the ability to integrate and differentiate is a good enough reason to choose this calculator over any other scientific Casio.

The only things I didn't like were the fact that boundaries have to be entered into your integral and an x value is required for the differential.

Other than that the only way this calculator could be any better is if it drew graphs, however bearing in mind it only costs a measly sum you would be expecting a lot.
"

Yes, I recommend this product.

Review 3 for Casio FX991ES Plus Scientific Calculator.

Overall rating

5
/
5

Re :Casio FX991ES Plus Scientific Calculator.

Posted28 May 2013

By Thulani

From:west yorkshire

Age:35 to 44

Gender:Male

" Was a good purchase for me.
"

Yes, I recommend this product.

Review 4 for Casio FX991ES Plus Scientific Calculator.

Overall rating

3
/
5

Scientific?

Posted28 May 2013

By Ntinos

From:uk

Age:18 to 24

Gender:Male

" For that amount of money, I expected something more scientific...
"

No, I do not recommend this product.

Review 5 for Casio FX991ES Plus Scientific Calculator.

Overall rating

5
/
5

Posted23 May 2013

By Calculus

From:England

Age:18 to 24

Gender:Male

" This calculator is very good for polar form matrices and their are tutorials on the Internet to help its very user freaindly aswell I'd defiantly recommend it for higer and lower education
"

No, I do not recommend this product.

Review 6 for Casio FX991ES Plus Scientific Calculator.

Overall rating

5
/
5

Best purchase for 'A' Level Further Maths Student!

Posted08 May 2013

By Caro

From:Dorset

Age:45 to 54

Gender:Female

" I bought this item for my daughter who is studying A level Further Maths - This is the highest spec calculator allowed in exams (graphic calculators not permitted). It has all the functions she needs including a matrices function; she is delighted with it and therefore, so am I!
"

Yes, I recommend this product.

Review 7 for Casio FX991ES Plus Scientific Calculator.

Overall rating

5
/
5

Incredible calculator

Posted08 May 2013

By Kieran

From:UK

Age:17 or under

Gender:Male

" What an amazing piece of equipment! Fast delivery, great price and amazing product!! Anyone doing alevel maths needs one of these!! Especially for the simultaneous equations, quadratics and cubics!!! :)
"

Yes, I recommend this product.

Review 8 for Casio FX991ES Plus Scientific Calculator.

Overall rating

5
/
5

great calculator!

Posted24 April 2013

By maki

From:hertfordshire

Age:17 or under

Gender:Male

" I got this for A level maths and it helps a GREAT deal. The other calculators that say 'suitable for GCSE/As level' usually don't have many things that are very useful in As/A level and so i would highly recommend getting this calculator - there are summing series buttons, matrices mode, complex mode, calculus buttons and many other buttons that are great.
"

Yes, I recommend this product.

Review 9 for Casio FX991ES Plus Scientific Calculator.

Overall rating

4
/
5

6th form number cruncher

Posted16 March 2013

By Mac

From:Sunderland

Age:17 or under

Gender:Male

" This calculator was recommended to me by my tutor after my school calculator suddenly took to providing wrong answers (even after changing batteries). It is far superior and is exactly the right tool for advanced mathematics.

I only hope it lasts more than the two years my old school calculator did. :P "

I only hope it lasts more than the two years my old school calculator did. :P "

Yes, I recommend this product.

Review 10 for Casio FX991ES Plus Scientific Calculator.

Overall rating

5
/
5

Great Calculator

Posted06 March 2013

By Mike

From:West Sussex

Age:45 to 54

Gender:Male

" A great calculator, suitable for 'A' level or beyond. Does everything you're ever likely to need it to do. However, some functions need multiple button presses to access, so keep the manual handy!
"

Yes, I recommend this product.

Review 11 for Casio FX991ES Plus Scientific Calculator.

Overall rating

5
/
5

Casio fx991es+ calculator

Posted06 March 2013

By Sam

From:Uk

Age:17 or under

Gender:Male

" Excellent calculator for my A'level further maths. Excellent, rapid service
"

Yes, I recommend this product.

Review 12 for Casio FX991ES Plus Scientific Calculator.

Overall rating

5
/
5

Great calculator

Posted06 February 2013

By AliV

From:Ceredigion

Age:25 to 34

Gender:Male

" Need this for my OU course, and it's excellent
"

Yes, I recommend this product.

Review 13 for Casio FX991ES Plus Scientific Calculator.

Overall rating

4
/
5

fairly good

Posted20 January 2013

By princess

Age:17 or under

Gender:Female

" does have quite few more things added on from the previous version but the price is almost doubled.

- quite slow. when pressing 'solve' it takes quite some time for some answers to display.also integration takes time too.

(a-level student studying further mathematics)
"

Yes, I recommend this product.

Review 14 for Casio FX991ES Plus Scientific Calculator.

Overall rating

5
/
5

God's gift to the A level mathematician

Posted16 January 2013

By Zeus

" Does everything you could ask for within the AS/A2 specification of calculator capabilities. Seems very reliable and a familiar layout of keys despite the additional functions.
"

Yes, I recommend this product.

Review 15 for Casio FX991ES Plus Scientific Calculator.

Overall rating

5
/
5

Plenty of functions

Posted30 October 2012

By SC

From:London

" It has so many functions. Would recommend for GCSE and AS Level.
"

Yes, I recommend this product.

Review 16 for Casio FX991ES Plus Scientific Calculator.

Overall rating

4
/
5

Excellent Scientific Calculator

Posted03 October 2012

By Vikram

From:Tyne and Wear

Age:25 to 34

Gender:Male

" Excellent choice for students, especially for Engineering students. Lots of function choices.
"

Yes, I recommend this product.

Review 17 for Casio FX991ES Plus Scientific Calculator.

Overall rating

5
/
5

good price

Posted25 July 2012

By gudgeon

From:Derbyshire

Age:55 to 64

Gender:Male

" Excellent value for capability. As an engineering lecturer for 40+ years I think Casio is the best type choice for a student
"

Yes, I recommend this product.

Review 18 for Casio FX991ES Plus Scientific Calculator.

Overall rating

4
/
5

Good calculator

Posted27 June 2012

By indra

From:uk

Age:17 or under

Gender:Male

" This calculator is an excellent tool to use for A Level maths and other subjects. I highly recommend this ahead of other calculators for use in studies.

I cannot give a 5* rating as when I got it, the battery was faulty and I had to replace it myself. I have had no problems other than that. "

I cannot give a 5* rating as when I got it, the battery was faulty and I had to replace it myself. I have had no problems other than that. "

Yes, I recommend this product.

Review 19 for Casio FX991ES Plus Scientific Calculator.

Overall rating

5
/
5

Very Good

Posted07 June 2012

By Andy

From:UK

Age:18 to 24

Gender:Male

" Best tool to get A* in GCE Maths

You can do integration and differentiation on this, allow you to check you answers. "

You can do integration and differentiation on this, allow you to check you answers. "

Yes, I recommend this product.

Review 20 for Casio FX991ES Plus Scientific Calculator.

Overall rating

5
/
5

Excellent for school

Posted24 May 2012

By Teresa

From:Bournemouth

Age:55 to 64

Gender:Female

" Seriously, if you have a child studying for their GCSE or A levels, he/she will benefit from buying this calculator! My son has said that the time it saves you is invaluable, especially during exam times!
"

Yes, I recommend this product.