Which scientific calculator is best for Engineers? (2021)

Which scientific calculator is best for Engineers? (2021) how to use scientific calculator

A scientific calculator is an essential tool for engineering professionals. It helps in solving complex calculations in seconds. Every engineer faces the dilemma of buying the right type of calculator. Scientific calculators are bought by engineering professionals during their college days, especially most of them buy these scientific calculators in their first year of under graduation (UG).

I am myself a chemical engineer currently in my third year of under graduation. I asked my batchmates, seniors, and juniors of different branches (including both circuit and non-circuit branches) about their views on factors they want in their scientific calculators. The top factors recommended by them are:

  1. Speed and accuracy of calculations
  2. Sleek and stylish design
  3. Light weight
  4. Display
  5. Price (Low cost)
  6. Warranty and after sales services
  7. Features
  8. Ease of use

I bought my first calculator in my Second Year of under graduation. During my first year, I used to borrow calculators from my batchmates while solving numericals and from seniors during my examinations. Most of my batchmates use Casio’s FX-991ES PLUS and FX-991EX CLASSWIZ. Few of the seniors used Texas Instruments TI-36X Pro. So, in my first year, I have used all of these scientific calculators.

Best scientific calculator in India


Casio FX-991ES PLUS is the lower model of Casio’s FX-991EX CLASSWIZ. FX-991EX CLASSWIZ is four times faster than the FX-991ES PLUS. Basically, FX-991EX CLASSWIZ is the upgraded form of FX-991ES PLUS. So, we will be comparing only CASIO’s FX-991EX CLASSWIZ and TEXAS INSTRUMENTS’ TI-36X PRO. This review is completely based on user experiences and suggestions.




Casio scientific calculator

Speed and accuracy of calculations: This calculator performs complex and long calculations quickly and accurately. You can also refer to the video for confirming it.

Sleek and stylish design: Personally, Casio FX-991EX ClassWiz has one of the best designs. The design of this calculator is sleek. Moreover, the metallic keys make them look even more stylish. You can choose between two different colors. This design is pocket-friendly and you can carry it in your pocket. This factor is quite handy.

Light weight: This scientific calculator is quite light weight and can be easily carried around (even in your pockets).

Display: It has a natural textbook display and high resolution. You won’t complain about its display. You can refer to the video for confirmation.

Price: Casio FX-991EX ClassWiz is one of the most cost-effective calculators in the market. For engineers, scientific calculators at this price with such features at such quality is surely a grab. If you’re from a middle-class family then this scientific calculator is for you.

Warranty and after sales services: This scientific calculator is the best in terms of the warranty, after sales services, and reliability. It comes with 3 years warranty. You need to register the scientific calculator online on the Casio website to claim the warranty. Casio FX-991EX ClassWiz again provides a 6 months additional free of cost warranty once you register the product online on http://register.casio.in. This process is quite hassle-free. This calculator hardly faces any issue in terms of technical errors or manufacturing defects. Yet, if there are any then the after sales service of Casio is awesome and hassle-free. Though you might have to submit your calculator for repair purposes.

Features: This scientific calculator comes with more than 552 functions including solving polynomials, matrix, integration, differentiation, and many more. QR code feature is useful for visualization. While you’re practicing, use the QR code feature to generate a graph that will aid in the learning process. You can either use the Casio app or any other Refer to the video for further details.

Others: The best part is that this scientific calculator is environment friendly and uses only recycled plastic. It doesn’t contain harmful metals like Lead, Mercury, and Cadmium which harm the environment.



Features: This scientific calculator has an inability to remember what you’re doing when the screen goes off due to inactivity. Moreover, few people mentioned that it lacks certain functions like LCM, GCD, and Remainder division.





Speed and accuracy of calculations: Even this scientific calculator performs complex and long calculations quickly and accurately. When you compare both these scientific calculators there isn’t much difference in the accuracy and speed.

Sleek and stylish design: TI-36X Pro may not be as stylish as FX-991EX ClassWiz but it is still quite sleek. Even this design is pocket-friendly and you can carry it in your pocket.

Light weight: Even this scientific calculator is also light weight and can be easily carried around (even in your pockets). But according to few users when compared to Casio’s calculator, this calculator is heavier.

Display: Arguably, it has a better display than the Casio one. Also, the display screen size is bigger than Casio’s scientific calculator.

Features: This scientific calculator comes with a number of functions including trigonometric functions, vectors, matrix operations, and many more. You can also find out operation history which is not available in Casio’s calculator.


Price: Texas Instruments TI-36 X Pro is about three times more costly than Casio FX-991EX ClassWiz. So, buy this calculator only if you can afford it.

Features: This scientific calculator lacks a few functions. For example, you cannot perform functions of 4×4 matrices.


I have used both these scientific calculators and asked several engineering graduates and engineering professionals. My personal opinion is that I was quite content and happy with Casio FX-991EX ClassWiz and Texas Instruments TI-36X Pro. I haven’t faced any issues so far with both these calculators but again owing to the cost, I bought a Casio FX-991EX ClassWiz. So, choose which is the best for you and go ahead and buy one for yourself if you’re planning to get your hands on a scientific calculator.

Value Mantra reviews are based on multiple customer reviews and experiences. All of the products we highlight are recommended for their quality, performance and overall reputation regardless of any affiliate relationship. We bring forth their thoughts, ideas and concerns so that you would understand what is best in the market. This post contains affiliate links for your convenience. We may earn a small commission for the endorsement, recommendation, and links to any products or services from this website.

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