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Your cart is empty.417 functions, Display: Natural Textbook Display, LCD (dot-matrix), 10 + 2 decimal places, Power supply: Solar & Battery, Basic Mathematical Functions, Table Generation, Base-n calculation, Scientific Constants, Vector, Basic Statistics, Differentiation, Non Graphing, Matrix, Equation, Integration, Complex number calculation, Comes with new slide-on hard case, Size (H x W x D): 11.1 x 77.0 x 161.5 mm, Weight: 95g
Adrian
2025-08-26 15:49:00
If you’re looking into different calculators chances are you’re probably taking advantage STEM classes and your teachers don’t allow graphing calculators or your SAT or ACT may not allow it. Well you’ve come to the right place because this calculator works wonders. I know it might sound odd at first but as someone who’s finishing up an Aerospace Engineering degree I can say that this calculator has come in clutch in more ways than one. Whether you’re solving advanced physics problems, math, or science related problems this calculator has an application. All the different modes that come in this calculator will be able to assist you in many way. It’s easy to use and understand, simply playing will that calculator will show you just how powerful it is. It’s great quality and the value for the price of the calculator is very worth it.
Customer
2025-08-13 15:59:47
Seems like a nice calculator. Had some confusion about certain operations, but reading the instructions pdf set me right. Only thing I'm disappointed with is I wish it had more variable storage including user named variables. So far I haven't been disappointed with the purchase, and I consider this calculator to be a good value for the money. I've had several calcs through the years of this name and only one failed bcs of the battery. I've still got one now I use occasionally and I've had it so long I can't remember when it was purchased(at least 20 yrs. +?)
JE
2025-08-10 16:43:08
Have all that is necessary for any STEM class.
Ski9
2025-07-21 15:08:02
UPDATE: I thought the U.S. version of this was the update to this model, the ClassWiz one with menus replacing some of the printed-on functions. That is indeed an update (but maybe to the EX versions rather than, or in addition to, ES versions? Because EX versions are discontinued). But actually the U.S. version of the 991ES is the Fx-115ES. I had thought that because of its lower number, it was just a lower-grade model. But in fact it is essentially the same as the 991ES with a few more capabilities and white instead of black. I like this calculator a lot so I wanted a "spare" plus it is nice to always have one of the two within easy reach, so I got the U.S. version as well. They are both similar high quality, just different colors. I am very pleased with these calculators.Previous review:I've used RPN HP calculators for years and didn't expect to enjoy or appreciate this non-RPN calculator as much as I do. The main reason I got it was that I found a couple of lovely calculator apps for Android that I figured out were supposed to mimic the 911 series Casio, and so I wanted the real thing. It has been easy and intuitive to figure out how to use. As someone else commented, this seems to be for Indian market so you probably won't have US warranty. But the US version is totally different; you have to access many of the functions through menus and they are not printed on/above the keys. But having them printed instead of having to access through menus is much more efficient once you learn where things are. The US menu version is maybe best for people who want to use the calculator briefly and/or don't want to bother learning it (like people used to a different brand). You might have to go to a non-US Casio site to find the pdf manual for the 991ES. It would have been nice to include a hard copy of the manual but these days that's rare, and I'm fine with this because it keeps prices down. US version is now ClassWiz which sadly replaced the 991 ES and 911 EX. So you have no choice but to get a non-US-market one if you want the ES or EX (but Amazon also sells a copy-cat version of the 911ES/EX from a different brand). As far as the hardware:The calculator has a nice look and feel. The plastic is premium and nice. The upper (smaller) keys feel nicer to me, especially as a (classic) HP user. The bottom (bigger) keys are a bit squishy but that's normal for most calculators. I like that there are no soft rubber keys or other soft parts (because soft plastics often get old and sticky and gross). The case goes on and off smoothly and does not scratch the calculator. I am glad I got this calculator and I'm sad that Casio is switching to a simplified look, menu-driven, version at least for the U.S. market.
James G Varner
2025-06-24 11:40:15
This is an awesome calculator, especially for the price! It has amazing functionality, so much so that I highly recommend reading and understanding the entire manual as there are a lot of details.
Mango
2025-05-16 16:20:46
It’s a nice calculator. It can be a little more difficult to remember all the functions. All in all it’s nice
luis
2025-03-28 09:39:51
Good price and quality
C Mauricio
2025-03-18 11:31:37
This calculator supports a vast array of functions, including basic arithmetic, trigonometry, statistics, and advanced mathematical operations. Whether you’re working on algebra, calculus, or physics problems, this calculator can handle it all. It even has a Matrix and Vector calculation function, which is a nice bonus for higher-level math.It’s compact, lightweight, and built to last, which makes it perfect for carrying around to class or work.Some of the advanced functions might require a little time to get used to, especially if you're not familiar with scientific calculators.
Sahad
2025-03-09 16:12:54
Excelente calculadora.
Customer
2025-03-02 11:35:14
Nice calculator best one yet
Geetika S.
2025-01-04 12:34:33
Macht was es verspricht, hat sehr viele nützliche Funktionen.Perfekt fürs Studium, großer Display und einfache Bedienung. Liegt leicht in der Hand und alle Tasten schön verständlich.Pro: Leicht, simple, großer DisplayContra: keine
Moin Shaikh
2024-12-08 15:36:34
The calculator works fine and it is surely useful for students like me thank you Amazon
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