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Casio FX-115ES Plus 2nd Edition vs Texas Instruments TI-36X Pro

Both are strong non-graphing scientific calculators with 4.7 ratings, but they suit different users. The Casio FX-115ES Plus 2nd Edition is the safer pick for high school and college test takers: it is explicitly approved for ACT, SAT, AP and PSAT, has 417 functions, and handles matrices up to 3x3, simultaneous equations and equation solving. The TI-36X Pro has a four-line MultiView display and 16-digit precision, which reviewers and owners favor for engineering and technical coursework. Build is plastic on both; the Casio ships with a hard slide-on case, and the TI carries a one-year limited warranty.

  • Choose the Casio FX-115ES Plus 2nd Edition if you are a high school or college student taking standardized tests and want a proven, test-approved calculator with a hard case.
  • Choose the TI-36X Pro if you are in engineering or technical courses and want a four-line display, 16-digit precision and graphing-calculator-style editing.

Prices

  • Casio FX-115ES Plus 2nd Edition: $9.00 at eBay (last seen Nov 1)
  • Texas Instruments TI-36X Pro: $27.35 at Best Buy (last seen Nov 8)
  • Difference: the Casio FX-115ES Plus 2nd Edition is $18.35 cheaper than the Texas Instruments TI-36X Pro at the latest prices (Nov 1 and Nov 8)
Casio
Casio FX-115ES Plus 2nd Edition Scientific Calculator

Casio FX-115ES Plus 2nd Edition

Casio FX-115ES Plus 2nd Edition Scientific Calculator

4.7(225 ratings)
$9.00at eBayObserved Nov 1, 2026, 12:08 PM
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Pros
  • Approved for ACT, SAT, AP and PSAT
  • 417 built-in functions, including matrices up to 3x3 and simultaneous equations
  • Natural Textbook Display shows formulas as written
  • Hard slide-on case included
  • Long battery life with auto power-off
Cons
  • Only two display lines
  • 10 + 2 digit precision is lower than the TI
  • Plastic keys and body feel basic
  • No graphing capability
Texas Instruments
Texas Instruments TI-36X Pro Scientific Calculator

Texas Instruments TI-36X Pro

Texas Instruments TI-36X Pro Scientific Calculator

4.7(1,000 ratings)
$27.35at Best BuyObserved at 9:55 PM
See all prices and details
Visit Best Buy
Pros
  • Four-line MultiView display shows several calculations at once
  • 16-digit precision
  • MathPrint shows stacked fractions and symbols as in textbooks
  • Toggle key converts fractions and square roots to decimals and back
  • Scroll and edit entries like a graphing calculator
Cons
  • Not stated as approved for ACT, SAT, AP or PSAT
  • Fewer listed functions than the Casio
  • No hard case mentioned in the listing
  • Plastic body

What separates them

Casio FX-115ES Plus 2nd EditionTexas Instruments TI-36X Pro
Display lines2-line Natural Textbook Display4-line MultiView display
Digit precision10 + 2 digits16 digits
Built-in functions417 functionsFewer listed functions, focused on engineering use
Test approvalApproved for ACT, SAT, AP and PSATNot stated as approved for those exams
PowerBattery with solar assist; about 3 years on one batteryBattery with solar; dual power source
Editing and scrollingStandard entry and replayGraphing-calculator-style scroll and edit
Case and warrantyHard slide-on case includedOne-year limited manufacturer warranty
Best fitHigh school and college test takersEngineering and technical courses

Price history

$20.99$9.00
Nov 1Nov 9
  • Casio FX-115ES Plus 2nd Edition: lowest $9.00 on Nov 1 at eBay; $20.99 on Nov 9.
  • Texas Instruments TI-36X Pro: lowest $20.25 on Nov 9 at EAI Education.

Prices at every store

Casio FX-115ES Plus 2nd Edition

  • QuillNew

    In stock

    $20.99Observed at 9:53 PM
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  • SchoolMartNew

    In stock

    $21.99Observed at 9:53 PM
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  • QuillNew

    In stock

    $20.99+ $5.99 shippingObserved at 11:01 PM
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  • eBayNew

    Availability unknown

    $9.00Observed Nov 1, 2026, 12:08 PM
    Visit eBay

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Texas Instruments TI-36X Pro

  • Best BuyNew

    In stock

    $27.35Observed at 9:55 PM
    Visit Best Buy

Also available at

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Prices and history →

Specs compared

SpecCasio FX-115ES Plus 2nd EditionTexas Instruments TI-36X Pro
Display TypeLCD DisplayLCD
Power SourceBatteryBattery-powered/Solar powered
Number of Display Lines24
colorWhitefalse
Calculator TypeScientific, Handheld—
PrintingNo—
Display Digit Count10 + 2 digits—
Display Line Count2—
Alphanumeric DisplayYes—
Battery SizeLR44—
Rechargeable BatteryYes—
Included ItemsCover—
Show all 40 specsShow fewer specs
SpecCasio FX-115ES Plus 2nd EditionTexas Instruments TI-36X Pro
Dimensions6.4 in (Length)—
Educational LevelHigh school, College—
Typical UsersStudents—
Skill LevelAdvanced—
Age RangeAdult—
Key TypePlastic keys—
Body MaterialPlastic—
USB PortNo—
KeysRegular size—
TypeCalculator

What reviewers say

Casio FX-115ES Plus 2nd Edition

  • 4.7 / 5225 ratings

Owners rate it highly, praising its natural display and the breadth of functions for the price. Complaints center on the learning curve for its modes and the limited two-line screen.

What people mention
  • DisplayMixedOwners like the natural textbook entry but find two lines too few for long expressions.
  • FunctionsPraisedReviewers value the calculus, matrix and vector features at this price.
  • Ease of useMixedThe mode menus take practice before they feel quick.
  • BuildMixedThe plastic body and keys are durable but feel light and small.

Texas Instruments TI-36X Pro

  • 4.7 / 51,000 ratings

Reviewers rate it very highly and treat it as the best non-graphing scientific calculator TI makes. Engineering students and professionals praise the textbook-style display and the breadth of functions. Complaints center on the learning curve and the crowded keypad.

What people mention
  • DisplayPraisedOwners like seeing stacked fractions and radicals exactly as written in textbooks.
  • FunctionsPraisedReviewers value matrices, vectors, complex numbers and conversions in a non-graphing body.
  • Learning curveMixedSome say the extra functions take practice to find and use fluently.
  • KeypadCriticised

Questions and answers

Which is better for the SAT or ACT?
The Casio FX-115ES Plus 2nd Edition. It is explicitly approved for ACT, SAT, AP and PSAT, while the TI-36X Pro is not stated as approved for those exams. Check your test's current policy before test day.
Which is better for engineering students?
The TI-36X Pro. Its four-line display, 16-digit precision and graphing-style editing suit engineering and technical coursework, which is what TI positions it for.
Which has more functions?
The Casio lists 417 built-in functions, including matrices up to 3x3, simultaneous equations and equation solving. The TI-36X Pro lists fewer functions but adds a four-line display and higher precision.
Is the TI-36X Pro worth stepping up to over the Casio?
Step up if you want the four-line display, 16-digit precision and easier editing. Stay with the Casio if you need test approval or a hard case.
Which lasts longer?
Both run on battery with solar assist. The Casio is rated for about three years on one battery with auto power-off; the TI carries a one-year limited warranty.
Do either graph functions?
No. Both are non-graphing scientific calculators. Choose a graphing model if you need plots.

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More comparisons

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  • Casio fx-991CW Advanced Scientific Calculator vs Texas Instruments TI-36X Pro Scientific Calculator

Buying guides that pick them

  • Best calculators under $100
—
Width (")56.0—
Weight (oz)7.0—
Height (")9.1—
FeaturesStatistical Functions, Solar Powered, Battery O…—
Depth (")1.0—
No. of Batteries (pcs)1—
Battery Life (h)26298.0—
Display Characters per Line12—
Battery TypeLR44—
DisplayMonochrome—
Multipack Quantity1—
size.38" x 3" x 6.38"—
Solar Powered—Yes
Function—Scientific
Digit Count—16 digits
Brand—Texas Instruments
Model Number—36PRO/TBL/1L1/A
Warranty - Parts—Manufacturer's limited one-year warranty.
Some find the keys small and the labels crowded on the compact body.