Please wait

Recently added Close

You have no items in your basket.

Casio FX-991ES Plus Scientific Calculator

Was £16.99

Now £15.99 Inc VAT

Availability: In stock

Casio FX-991ES Plus Scientific Calculator

Price display Inc VAT : change
Save £1

Was £16.99

Now £15.99 Inc VAT

Availability: In stock

Code: 1201042079

* Required Fields

Delivery options available:
Free Next Day Delivery when you spend £30 or more
Free Delivery to Store
Standard delivery
Next day delivery
Named day delivery
Saturday delivery
Click & Collect
Free Delivery to store. 1-5 days*
*Click here for your store delivery time


The Casio FX991ESPLUS is Casio's most advanced scientific calculator with 417 mathematical functions. Recommended for Advanced GCSE, A/AS level and Highers. This ever popular model is now available with Random Integers and an improved equation mode.

The large Natural Textbook Display (Natural-V.P.A.M.) shows mathematical expressions like roots and fractions as they appear in your textbooks which increases comprehension because results are easier to understand.

Main Points

Recommended for Advanced GCSE, A/AS level and Highers.
Large 10+2 Natural V.P.A.M. Textbook Display - displays as written in a mathmatical textbook .
Dual power source - solar and battery with Auto power shut off
417 functions.
Easy function menu system.
Slide-on protective hard case.
Random Integers, new Equation mode with solver
Calculation with complex numbers
40 Physical constants and 20 pairs of values for metric conversion
Numerical integral and differential calculus
9 data memory.
Table of function values.
Algebraic logic.
Regression analysis.
Statistical functions.
24 levels of parenthesis.
Metric conversions.
Batteries required 1 x LR44 (included).
3 year guarantee

Alternative models

If you require an even more powerful and more advanced calculator, the Casio Graphic calculator range provides dynamic graphing; capable of calculating and displaying graphs, charts, spreadsheets and statistics. The Casio range includes the FX-9750GII, FX-9860GII


Standard delivery charges apply to this product
N.B Charges apply to the whole order, not per product.

Enjoy FREE Standard and Next Working Day courier delivery on all orders over £30 (inc VAT)

For orders under £30, delivery is just…

Standard £2.90

Next Day £3.40

Named Day £6.95

Saturday Delivery £8.95

Alternatively you can choose to have your order delivered for FREE to a Ryman Store of your choice for delivery within 5-7 days.

The Extras You Need to Know…

For Next Day Delivery orders must be received by 3pm to guarantee next day delivery.

Some of our products are sent directly from our suppliers, and can take a little longer to arrive. Look out for the van symbol next to the product image and the delivery advisory in the product description to easily identify these products.

If you’re outside of England, Scotland and Wales, your delivery prices may change a little. See our complete Delivery Policy here for more information.

If you still have questions, our Customer Services Team would love to hear from you. Just call 0800 801 901.


Think you might change your mind?

Don’t worry! If you change your mind for any reason or in the rare event there is a fault with your product we are more than happy to offer you a full refund*.

Simply ensure the goods are returned within 28 days of delivery and in a re-saleable condition and we’ll take care of the rest.

*For our full returns policies please see our General Policy.

If you still have questions, our Customer Services Team will be happy to help. Just call them on 0800 801 901

Rely on Ryman

With over 230 stores nationwide and over 120 years of retailing experience you can Rely on Ryman for all your home, office and convenience needs.

We pride ourselves on our continued commitment to quality, value, reliability and service. We’ve developed and nurtured these values for over 120 years and we think they make Ryman the acknowledged leader in its field.

Such high regard for customer care and specialist knowledge have allowed Ryman to build and retain a very loyal and happy customer base, so whether you’re a new customer or you’ve come back to see us we’re ready to welcome you on board.


Need some help?

Our customer services team would love to hear from you if you need help with some product advice or have any other query, please call 0800 801 901. Overseas please call 00441270442900 (9am to 7pm Monday to Friday, 9am to 5pm Saturdays)

For high street store related queries please contact your nearest store. Please use our store finder for contact details or call our branch liaison team on 01270 530650 (8am to 6.30pm Monday to Friday)

For Business Account enquiries please email or call 01270 530635 (8:30am to 5:00pm Monday to Friday, 9am to 6pm Saturdays and 10am to 4pm on Sundays)

Related items