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Casio ClassWiz CW fx-991CW vs Casio fx-9750GIII Graphing Calculator

Buy the fx-991CW for exam-day science and engineering work where graphing is banned or unnecessary: it is lighter, runs on solar with a backup battery, and its four-tone display and OK/Back keys are easier to use under time pressure. Buy the fx-9750GIII if you need to plot functions, work with matrices, or write MicroPython, since the fx-991CW cannot graph or program. Owners praise the CW's clearer screen and simpler layout; the fx-9750GIII's 4.2 rating reflects solid graphing for the money but a steeper learning curve and four AAA batteries to manage.

  • Choose the Casio ClassWiz fx-991CW if you need a non-graphing scientific calculator for exams, want solar power and a lighter body, and value an easy-to-read four-tone screen over graphing.
  • Choose the Casio fx-9750GIII if your course requires graphing, matrices, or Python programming, or your exam rules allow a graphing calculator.

Prices

  • Casio ClassWiz CW fx-991CW: $22.50 at Continental Photo (last seen Nov 8)
  • Casio fx-9750GIII Graphing Calculator: $45.99 at eBay (last seen Nov 8)
  • Difference: the Casio ClassWiz CW fx-991CW is $23.49 cheaper than the Casio fx-9750GIII Graphing Calculator at the latest prices (Nov 8)
Casio
Casio ClassWiz CW fx-991CW Scientific Calculator

Casio ClassWiz CW fx-991CW

Casio ClassWiz CW fx-991CW Scientific Calculator

$22.50at Continental PhotoObserved Nov 8, 2026, 12:55 PM
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Pros
  • Solar power with battery backup means fewer battery changes
  • Light and slim at 95 g
  • Four-tone display shows which part of the entry is active
  • OK and Back keys speed up menu navigation
  • 540 functions cover most science and engineering courses
Cons
  • Cannot graph functions or inequalities
  • No programming or Python support
  • Smaller display than a graphing model
  • Not suited to courses that require plotting
Casio
Casio fx-9750GIII

Casio fx-9750GIII Graphing Calculator

Casio fx-9750GIII

4.2(40 ratings)
$45.99at eBayObserved at 9:53 PM
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Pros
  • Graphs rectangular, polar, parametric functions and inequalities
  • MicroPython programming with 3MB flash storage
  • Matrix operations up to 6x6 and conics analysis
  • Accepted on SAT, ACT, AP, IB and PSAT
  • Slide-on hard case protects the screen
Cons
  • Runs on four AAA batteries, no solar
  • Bulkier and heavier than a scientific model
  • Icon menus take time to learn
  • Monochrome screen with no shading of active entry

What separates them

Casio ClassWiz CW fx-991CWCasio fx-9750GIII Graphing Calculator
GraphingNo graphing; scientific functions onlyGraphs rectangular, polar, parametric functions and inequalities
ProgrammingNo user programmingMicroPython plus 3MB flash storage
PowerSolar cell with LR44 backup batteryFour AAA batteries, no solar
Weight and size95 g, 10.7 x 77 x 162 mmLarger body, roughly 3.6 x 7.25 in, with slide-on hard case
DisplayFour-gradation LCD that shades the active entryMonochrome 64 x 128 pixel, 21 x 8 characters
Key layoutDedicated OK and Back keys, convex easy-push keysPlastic keys with icon menu and soft function menus
Exam suitabilityFits most non-graphing exam rulesAllowed on SAT, ACT, AP, IB and PSAT where graphing is permitted
Learning extrasMathBox practice mode and ClassPad.net linkingIcon menu, matrix mode up to 6x6, conics and recursion

Price history

$45.99$22.50
Nov 1Nov 9
  • Casio ClassWiz CW fx-991CW: lowest $22.50 on Nov 8 at Continental Photo.
  • Casio fx-9750GIII Graphing Calculator: lowest $45.99 on Nov 9 at eBay.

Prices at every store

Casio ClassWiz CW fx-991CW

  • University of Alabama Supply StoreNew

    In stock

    $27.99+ $5.99 shippingObserved Nov 8, 2026, 12:55 PM
    Visit University of Alabama Supply Store
  • WalmartNew

    In stock

    $29.98+ $6.99 shippingObserved Nov 8, 2026, 12:55 PM
    Visit Walmart
  • Continental PhotoNew

    Availability unknown

    $22.50Observed Nov 8, 2026, 12:55 PM
    Visit Continental Photo
  • eBayNew

    Availability unknown

    $29.99Observed Nov 8, 2026, 12:55 PM
    Visit eBay

Also available at

  • TeciSoftCheck price at TeciSoft
  • WalmartCheck price at Walmart

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Casio fx-9750GIII Graphing Calculator

  • eBayNew

    In stockSold by bullseye_deals

    $45.99Observed at 9:53 PM
    Visit eBay
  • WalmartNew

    In stockSold by Momo Quick Ship

    $49.00Observed at 9:53 PM
    Visit Walmart
  • TargetNew

    In stock

    $69.49Observed at 9:53 PM
    Visit Target
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $69.49Free shippingObserved at 9:53 PM
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Specs compared

SpecCasio ClassWiz CW fx-991CWCasio fx-9750GIII Graphing Calculator
ColorGrayMulticolor
Dimensions10.7 (H) × 77 (W) × 162 (D) mmRegular (Display Size)
Display typequadruple graded LCD displaymonochrome
Power requirementsBuilt-in solar cell; button battery LR44 × 1—
Battery life2 years (based on one hour of operation per day)—
Operating temperature0°C to 40°C (32°F to 104°F)—
Dimensions (imperial)7/16” (H) × 3 1/16” (W) × 6 3/8” (D)—
Weight95 g (3.4 oz) including the battery—
Scientific constants47—
Measurement conversions40—
Variable storageup to nine variables—
Display resolution—64 x 128 pixel
Show all 37 specsShow fewer specs
SpecCasio ClassWiz CW fx-991CWCasio fx-9750GIII Graphing Calculator
Flash memory—3MB Flash ROM
Programming language—MicroPython
Display characters—21 x 8
Power source—Battery
Battery type—AAA
Size—3.6 x 7.25
Case—Slide-On Hard Case
RAM—62KB RAM
Battery count—four AAA batteries
Calculator Type

What reviewers say

Casio ClassWiz CW fx-991CW

Owners generally rate the fx-991CW as a capable, exam-friendly upgrade with a clearer screen and easier menus, though some long-time ClassWiz users miss the older key layout and fraction entry.

What people mention
  • DisplayPraisedOwners like the grey-tone 4-gradation screen for showing which part of an expression is selected.
  • Key layoutMixedThe new OK and Back keys and streamlined layout help beginners but frustrate users used to the fx-991EX.
  • Fraction entryCriticisedSome owners say entering and reading stacked fractions is less intuitive than on earlier ClassWiz models.
  • BatteryPraisedThe solar cell plus LR44 backup is reported to last a long time with normal use.

Casio fx-9750GIII Graphing Calculator

  • 4.2 / 540 ratings

Owners rate it well as a capable, affordable graphing calculator that handles coursework and exams. Reviewers like the Python support and the clear menu system, while some find the monochrome screen and key feel dated next to color models.

What people mention
  • DisplayMixedOwners say the monochrome screen is clear for graphs but lacks the color and sharpness of rival models.
  • PythonPraisedReviewers like having MicroPython on a calculator at this level for learning to code.
  • BatteryMixedUsers note it runs on four AAA batteries rather than a rechargeable pack, so they keep spares on hand.

Questions and answers

Which is better for the SAT or ACT?
The fx-9750GIII is accepted on the SAT, ACT, AP, IB and PSAT, and its graphing helps on coordinate geometry. The fx-991CW is fine where graphing calculators are allowed or banned, but check your test's rules first.
Can the fx-991CW graph?
No. It is a scientific calculator with 540 functions but no plotting. If you need graphs, matrices or Python, step up to the fx-9750GIII.
Which lasts longer on a set of batteries?
The fx-991CW runs mainly on its solar cell, with an LR44 backup rated about two years at one hour a day. The fx-9750GIII uses four AAA batteries, so expect to replace them more often.
Is the fx-9750GIII worth stepping up to?
Yes if your course needs graphing, matrices or programming. If you only need arithmetic, trig, stats and constants, the lighter fx-991CW does the job with a clearer screen.
Which is easier to use in an exam?
The fx-991CW. Its OK and Back keys and four-tone display make menu work faster. The fx-9750GIII's icon menus are more powerful but slower to navigate.

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Buying guides that pick them

  • Best calculators under $100
—
Graphing, Handheld
Printing—No
Display Digit Count—10 + 2 digits
Display Line Count—8
Alphanumeric Display—Yes
Battery Size—AAA
Rechargeable Battery—No
Included Items—Hard case
Educational Level—High school, College
Typical Users—Students
Skill Level—Entry-level
Age Range—Adult
Key Type—Plastic keys
Body Material—Plastic
USB Port—Yes
Keys—Over 2900 (Number of Functions)
  • Exam usePraisedBuyers report it is accepted for SAT, ACT, AP and IB exams and dependable in test settings.