Product Comparison: Casio FX-115ES Plus vs Casio FX-991EX

Advertiser Disclosure

This site is a free online resource that strives to offer helpful content and comparison features to its visitors. Please be advised that the operator of this site accepts advertising compensation from certain companies that appear on the site, and such compensation impacts the location and order in which the companies (and/or their products) are presented, and in some cases may also impact the scoring that is assigned to them. The scoring that appears on this site is determined by the site operator in its sole discretion, and should NOT be relied upon for accuracy purposes. In fact, Company/product listings on this page DO NOT imply endorsement by the site operator. Except as expressly set forth in our Terms of Use, all representations and warranties regarding the information presented on this page are disclaimed. The information which appears on this site is subject to change at any time. More info

General Specifications
FX-115ES Plus
About the Product
Casio’s latest and most advanced scientific calculator features new Natural Textbook Display and improved math functionality. FX115ES PLUS has been designed to be the perfect choice for high school and college students learning General Math, Trigonometry, Statistics, Algebra I and II, Calculus, Engineering, Physics.
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.
Size & Weight
6.38 in.
6.52 in.
3.15 in.
3.03 in.
0.44 in.
0.44 in.
3.4 oz.
3.2 oz.
What customers say about "Size & Weight"
Casio FX-115ES Plus Pocket, Battery/Solar, Scientific calculator, Purple, Silver, Plastic
  • Used this for my licensing exam. Calculator works great. Powerful calculator for its size.
  • I needed this calculator for my math course and it works really well and the size of it fits into my bag nicely.
  • The buttons on the keypad are a perfect size so that you will not accidentally select another unintended button.
  • It is simple to use and light weight. Color is good. No place to complain. Thumbs Up.
  • Uncomfortable sizes sometimes make it difficult to carry around.
Casio FX-991EX Engineering/Scientific Calculator, Black (European Version)
  • Together with a basic spreadsheet facility in addition to other useful features which have been around for some time and you really have an incredibly useful little machine!
  • Awesome little calculator that surpasses many similar models.
  • Light and beautiful, this is the calculator that is not ashamed to get out of the backpack.
  • The size is ideal so that this calculator is always with you.
  • The only minor disappoint is the font size is too small.
Display Type
Display Size
96 x 31 pixels
192 x 62
Touch Screen
What customers say about "Display"
Casio FX-115ES Plus Pocket, Battery/Solar, Scientific calculator, Purple, Silver, Plastic
  • Display is nice and roomy for the price unlike most devices within this price range.
  • The way the equations are displayed make it easy to read to ensure the correct information was entered.
  • The display is very simple and clean, you can apply complex/long equations easily like how you would write it on paper.
  • The display is clear and easy to read, and the keys have a nice feel to them with just the right amount of snappiness.
  • It's a scientific calculator. The display is nice and shows equations. There are alot of options for how to display results, decimal vs fraction vs improper fraction vs radians and so on.
Casio FX-991EX Engineering/Scientific Calculator, Black (European Version)
  • The screen is much higher definition, greatly helping legibility.
  • It has an easy-to-read display and I have had no problems with it so far.
  • You get a crystal clear, 'natural' display, with answers presented as surds, or multiples of pi, including fractions, where possible.
  • I was amazed by their high resolution display to allows the calculator to display full text rather than abbreviations.
  • The display is very good and most importantly shows everything in 'textbook' format rather than laid on a single line.
PC Connectivity
Battery Type
LR44 (GPA76) x 1
1 x LR-44
Pre-Loaded Applications
All General Mathematics courses, Pre-Algebra, Algebra I & II, Polar, Statistics I/II Var, Pre-Calculus, Trignonmetry, Chemistry, Physics, Engineering
Calculate, Complex, Base-n, Matrix, Vector, Statistics, Distribution, Spreadsheet, Tables, Equation/Function, Inequality, Ratio
Natural textbook display, Over 280 functions, Built-in solar cell, Simultaneous and polynomial solver, Matrix and vector calculations, Variable memory: 9
Built-in solar cell, Variable memory: 9, Easy and Intuitive operability, Natural textbook display
What customers say about "Features"
Casio FX-115ES Plus Pocket, Battery/Solar, Scientific calculator, Purple, Silver, Plastic
  • This is a really good scientific calculator for any college student in Algebra and Pre-Cal. I found it having the same features but easier to use than the TI-36X Pro.
  • Like any graphing calculator, the Casio lets you store lists of data, fit regression curves, and see 1- and 2-variable stats.
  • It does things that the TI-84 doesn't do, such as finding the inverse regression equation A + B/x for paired (x, y) data.
  • Buttons and UI can be a little overwhelming at first glance if you're used to the simplicity of the TI-XX family.
  • Buttons are very flimsy and cheap. Seems low quality.
Casio FX-991EX Engineering/Scientific Calculator, Black (European Version)
  • The internals have also been upgraded, so certain operations (e.g. numerical integration) are MUCH quicker.
  • The calculator tells you when you're on solar and when you're draining the battery.
  • All in all, an excellent calculator - and the fact that it's dual solar/battery powered is a nice bonus.
  • It has to be the fact that display history is cleared when the calculator is switched off and once you've performed a calculation, you can not go back, edit the history and recalculate.
  • It's not programmable, isn't a true graphical calculator, can't connect to your PC and can't take additional apps, like an fx-9860GII or uprated fx-9750GII.
Warranty / Certifications
Manufacturer Warranty
1 year(s)
1 year(s)
Other Information
19.79 $

Price History

Other reviews