Casio FX991MS Scientific  Calculator
    Casio FX991MS Scientific Calculator (12 Digit)

    Casio FX991MS Scientific Calculator  (12 Digit)

    1,630 Ratings & 155 Reviews
    10% off
  • Bank OfferExtra 5% off* on Axis Bank Buzz Credit Cards
  • Bank OfferAdditional 10% Cashback* with Citi Credit and Debit Cards (Credited by 10th Aug, 2017)
  • PhonePe OfferGet 25% Cashback* on Payments via PhonePe (Max Cashback - ₹200)
  • Delivery
    Tip: Verify your pincode for correct delivery details
      From Saved Addresses
      Recent History
    Loginto see your saved addresses
    • Usually delivered in 7-8 days. Enter pincode for exact delivery dates/charges

      Why is there a shipping charge for this item?

      Sellers with Flipkart Assured waive off the delivery charge for Orders over Rs 500. For Orders under Rs 500, a nominal delivery charge is added per item.

      Sellers without Flipkart Assured may or may not add a delivery charge to your Order. This is subject to Seller discretion.

      What is the estimated delivery time?

      Sellers generally procure and ship the items within the time specified on the product page. Business days exclude public holidays and Sundays.

      Estimated delivery time depends on the following factors:

      • The Seller offering the product
      • Product's availability with the Seller
      • The destination to which you want the order shipped to and the Seller's location

      Why does the delivery date not correspond to the delivery timeline of X-Y business days?

      It is possible that the Seller or our courier partners observe a holiday between the day you placed your order and the date of delivery, which is based on the timelines shown on the product page. In this case, we add a day to the estimated date. Some courier partners and Sellers do not work on Sundays and this is factored in to the delivery dates.

      What do the different tags like 'In Stock', 'Available' mean?

      'In Stock'

      Products‘In Stock’ are readily available with seller.


      Products listed as ‘In Stock’ are readily available with seller.

      'Preorder' or 'Forthcoming'

      The product is not released yet. You can however ‘book’ an order for this. Shipping happens only after the product launch.

      'Out of Stock'

      Currently, the item is not available for sale. Use the 'Notify Me' feature to know once it is available for purchase.


      Sometimes, items have to be sourced by Sellers from outside India. These items are mentioned as 'Imported' on the product page and can take at least 10 days or more to be delivered to you.

      'Back In Stock Soon'

      The item is popular and is sold out. You can however 'book' an order for the product and it will be shipped according to the timelines mentioned by the Seller.

      'Temporarily Unavailable'

      The product is currently out of stock and is not available for purchase. The product could to be in stock soon. Use the 'Notify Me' feature to know when it is available for purchase.

      'Permanently Discontinued'

      This product is no longer available because it is obsolete and/or its production has been discontinued.

      'Out of Print'

      This product is not available because it is no longer published and has been permanently discontinued.

      Why does the estimated delivery time vary for each seller?

      Delivery times are influenced by product availability, geographic location of the Seller, your shipping destination and the courier partner's time-to-deliver to your location.

      Please enter your default pin code on the product page to know more accurate delivery times on the product page itself.

      Seller does not/cannot ship to my area. Why?

      Enter your pincode on the product page to know whether the product can be delivered to your location.

      If you haven't provided your pincode until the checkout stage, the pincode in your last used shipping address will be used to check for serviceability.

      Whether your location can be serviced or not depends on:

      • Whether the Seller actually ships to your location
      • Legal restrictions, if any, in shipping particular products to your location
      • The availability of reliable courier partners in your location

      At times Sellers prefer not to ship to certain locations. This is entirely at their discretion.

      More answers in our Shipping FAQs »

    • Scientific Calcualtor
    • 12 Digits Display
    • Powered By Battery and Solar
    • 10 Days Replacement Policy
      ValidityCoversType Accepted
      10 days from deliveryDamaged, Defective, Item not as describedReplacement

      If you have received a damaged or defective product or if it is not as described, you can raise a replacement request on the Website/App/Mobile site within 10 days of receiving the product.

      Successful pick-up of the product is subject to the following conditions being met:

      • Correct and complete product (with the original brand/product Id/undetached MRP tag/product's original packaging/freebies and accessories).
      • The product should be in unused, undamaged and original condition without any scratches or dents.

      Know more about the Return Policy here

    • Cash on Delivery available

      How do I place a Cash on Delivery (C-o-D) order?

      All items that have the 'Cash on Delivery Available' icon are valid for order by Cash on Delivery. Add the item(s) to your cart and proceed to checkout. When prompted to choose a payment option, select 'Pay By Cash on Delivery'. Enter the CAPTCHA text as shown, for validation. Once verified and confirmed, your order will be processed for shipment in the time specified, from the date of confirmation. You will be required to make a cash-only payment to our courier partner at the time of delivery of your order to complete the payment.

      Terms & Conditions

      • e-Gift Vouchers or Store Credit cannot be used for C-o-D orders.
      • Cash-only payment at the time of delivery.

        More answers in our Shipping FAQs »


    Promising you with multiple benefits, this FX991MS Scientific calculator is the most useful tool for calculating your mathematical problems with great ease. An ideal tool for young students and professionals, this 12 digits calculator is designed with innovative technologies.

    401 Functions

    Exclusively designed with multi features, this calculator is a best tool to carry out various mathematical functions such as scientific calculations, metric conversions, statistics and logistic operations.

    2-Line Display

    In the 2 line display of this calculator, you can have a better view and easily understand the entry of data as well as obtained result at the same time.

    10 + 2 Digits

    This scientific calculator has the capacity to display 10 + 2 digits making it easier to carry on more complex calculations.

    STAT Data Editor, Standard Deviation, Normal Distribution Calculations, Regression Analysis

    You can easily solve out various statistical operations relating to standard deviation, regression analysis and also edit the statistical data with the improved technology of this calculator.

    Multi-replay Function

    The special multi-replay feature of this calculator enables you to recall and edit the already executed formula.

    Slide-on Hard Case

    To protect the surface of this calculator from scratches, there is a hard case provided which can also be easily slided and handled.

    Solve Function

    This calculator features a solve function which helps you to solve an equation without much effort.

    Dot Matrix Display

    For a better view and understanding of graphs, this calculator comes with a dot matrix display.

    Plastic Keys

    The plastic keys guarantee easy and quick operation.

    Read More
    • Brand Name
      • Casio
    • Model No
      • FX991MS
    • Type
      • Scientific
    • Key Type
      • Plastic
    • Display (Digits)
      • 12
    • Power Source
      • Battery and Solar
    Special Features
        • Up to 260 Functions
        • Extra Large High Contrast Clear Display
        • Key Operations are Stored in Buffer
        • 9 Variable Memories
        • Matrix Calculations
        • Equation Calculations
        • Vector Calculations
        • Battery Size: AA
    1,630 Ratings
    155 Reviews
    • 5
    • 4
    • 3
    • 2
    • 1
    Most Helpful 
    Most Recent 
    By Certified Buyers 


    I used to have a Casio 9FX Caculator during my college days as most of the other students had. There were two versions of the Casio calculator and the cover used to break by the time you moved to Second year. The richer ones among us used to sport the trendy ones from Texas Instruments. Come to think of it the Calculator was called Calci during those days. I am not sure whether the same slang persists now or not.

    Anyway coming to the product the updated FX991MS model from Casio is the best o...


    Certified Buyer

    30 Jul, 2012

    Report Abuse

    Best for Engineering

    I am a FY IT Student I used one of my friend's Casio FX991MS Scientific Calculator and It's awesome.
    It is Best for engineering students and I think that it is also recommended by teachers also...................
    All I am not a certified buyer cause I don't have this but I have used this and reliable because of its 3 years Casio India warranty ...........So just Trust it because its "CASIO"..................

    Awesome Agrawal

    Certified Buyer

    11 Sep, 2012

    Report Abuse

    The best and most eonomical choice for any science student

    I have been using this for the past year and it has worked perfectly.
    The form factor is just amazing. It is very thin and light as compared to the ones available a few years back. The solid cover is very useful as it prevents the calculator itself from getting damaged. It has everything that a science as well as engineering student will ever need (to do on a calculator ;))

    This does not have the notebook display, which however, i dont feel is very helpful. If you plan on using this calcula...

    Asheesh Ranjan

    Certified Buyer

    12 Jan, 2012

    Report Abuse


    Working Good. Original. The 991-ms is good for matrix multiplications -3X3 being maximum( I prefer it for that), doesnot support 4X4 matrix. If you need to multiply 4X4 or more go for Graphing Calc(Graphing Calc are not cheap). An alternate solution to graphing calc would be Phone/Tablet Apps which are available on play store and windows phone store as well.

    Bhavan Shah

    Certified Buyer

    22 Dec, 2014

    Report Abuse

    Excellent Scientific Calculator

    Haven't bought this from flipkart, but from the market. Price at flipkart is very good.

    Pro: Good build quality. 2 line display, both lines quite large and legible. Reasonably large buttons for easy use. Runs on LR44 cell as backup when light is not sufficient for solar panel to work. Very sleek. Scroll up-down to look at previous calculations. Speedy processor (I use 69! - 69 factorial - as a good calculation to check speed in any calculator).

    Con: Very few and probably very minor. Just wo...

    Aalap Shah

    Certified Buyer

    29 Nov, 2012

    Report Abuse


    I am a M.Tech student at IITD, and using it since last 5 years.
    Believe me it is the Best calculator a Science Student can have, it can do whatever mathematical operation you want to perform....
    and plz do NOT buy lower models, as this one makes calculations Super FAST as compared to lower versions..


    Nikhil Sharma

    Certified Buyer

    1 Apr, 2012

    Report Abuse

    Awsem Delivery service

    Got this product in just 2 days from the date of order.
    Awsem condition.
    coming to the product the updated FX991MS model from Casio is the best of the lot. The cover is a slider type and can fit as top cover or can be used for support as bottom cover.

    The calculator has got all the functions required to tackle all subjects of Engineering be it Maths, Theory of Machines, Heat and Mass Transfer, Thermodynamics, Fluid Machines, Machine Desgin et al...yes I am a Mechanical Enginner and I purcha...


    Certified Buyer

    18 Dec, 2012

    Report Abuse

    Best Calculator

    I have been using this for the past year and it has worked perfectly.
    The form factor is just amazing. It is very thin and light as compared to the ones available a few years back. The solid cover is very useful as it prevents the calculator itself from getting damaged. It has everything that a science as well as engineering student will ever need (to do on a calculator ;))

    This does not have the notebook display, which however, i dont feel is very helpful. If you plan on using this calculat...

    Aakash Samuel Lall

    Certified Buyer

    15 Jun, 2012

    Report Abuse

    A good Calculator for Engineers

    I am an Engineering student and I bought this calculator when I was in 12th standard. I have used the calculator for 5 years now seamlessly and is still in good condition without any need for battery replacement. This calculator is ergonomic and is highly functional in performing calculations varying from different mathematical domains. Highly useful and a must buy for engineers and engineering students.

    Girish M

    Certified Buyer

    10 Apr, 2012

    Report Abuse

    Review after using the calculator over 6 years

    I have used the calculator since 2004.That time it is the best calculator available at Kolkata. It has almost everything but now-a-days you get more better calculator with graphic display. So, I don't think anyone like to buy this calculator.

    Sourav Debnath

    Certified Buyer

    9 Dec, 2011

    Report Abuse
    View all 155 reviews
    Safe and Secure Payments. Easy returns. 100% Authentic products.
    You May Also Be Interested In
    All Categories
    Back to top