Casio ClassWiz vs TI-84: Why US Students Pay $100 for a $25 Calculator, and Which One Your Exam Actually Allows
Outside the US a ClassWiz costs about $25; inside it, a TI-84 Plus CE runs near $100. We pulled the 2026 NCEES, SAT, ACT and AP calculator rules from the official bodies, including the Casio model name that may fail an NCEES check, and worked out who should buy what.
The gap is roughly four to one, and it is not about the hardware
In August 2026 a Casio fx-991CW ClassWiz was listed at $24.99 at Staples and $24.98 at Walmart. The Casio fx-115ES PLUS 2nd Edition, the US-market sibling, sits under $20 at most office retailers. A TI-84 Plus CE is the standard purchase for an American high school maths class; Texas Instruments does not publish a list price on its product page, and retail listings have hovered near the $100 mark, with a Walmart promotion in July 2025 putting the Python edition at $95.
The TI-84 does more: it graphs on the device, it has a 320x240 backlit colour screen, a rechargeable battery, and TI-Basic plus a Python environment on the Python edition. That is real. But a US student is rarely choosing between graphing and not graphing. They are told which calculator to buy, and the answer is a TI-84. The reason is institutional, not technical.
Why the US is the outlier
Three things lock the American classroom to one brand.
Curriculum and teacher materials. US secondary maths worksheets and lesson plans have TI keystroke sequences written into them. A teacher running thirty students through a stats exercise wants every screen identical, and switching brands means rewriting materials no individual teacher gains from rewriting.
Exam-board lists. College Board maintains an approved graphing calculator list for AP exams, and the TI line is on it in depth. Casio is on it too, but the list is a floor, not a recommendation, and schools default to what their materials already assume.
Installed base. The last year TI broke out its calculator business in its financial reporting was 2007: roughly $526 million in revenue, about $208 million in profit. It stopped reporting the segment separately after 2008, so anything more recent is estimate, not disclosure. Contemporary accounts put TI at around 80% of US graphing calculator sales as of 2009. Treat the margin figures quoted online as secondhand — the underlying disclosures ended nearly two decades ago.
That is a coordination problem nobody has an incentive to solve, and the bill lands on the student.
The exam rules, checked at the source
Policies verified against the official bodies on 16 August 2026. Verify again yourself before test day — these are revised, and a wrong assumption here costs you the exam, not a refund.
NCEES (FE, PE, PS, SE). This is the strictest and the most interesting. The 2026 policy approves only: all Casio fx-115 and fx-991 models, with the explicit rule that a Casio must have “fx-115” or “fx-991” in its model name; the HP 33s and 35s and no others; and all Texas Instruments TI-30X and TI-36X models. That is the whole list. No TI-84. No Casio graphing model. An engineering student who spent $100 on a TI-84 in high school cannot bring it to the FE.
SAT (College Board). A calculator is permitted throughout the Math section and must be stowed during Reading and Writing. Bluebook, the digital testing app, has a Desmos graphing calculator built in with graphing and scientific modes, so no purchase is strictly required. College Board states it no longer maintains a list of permitted graphing calculators and directs you to the prohibited-features list instead: no CAS or symbolic algebra, no QWERTY keyboard, no wireless, Bluetooth or cellular, no camera, no paper tape.
ACT. Calculators are allowed only on the mathematics test — not science. Four-function, scientific and graphing models are all permitted unless prohibited. Prohibited by name: all TI-89 and TI-92 models and the TI-Nspire CAS (the non-CAS Nspire is permitted); HP Prime, HP 48GII, and all HP 40G/49G/50G models; Casio fx-CP400 ClassPad, ClassPad 300/m330, Algebra fx 2.0 and CFX-9970G. QWERTY letter keys, handheld or tablet computers, and phone calculators are out. Online ACT testing includes a built-in Desmos graphing calculator for Math.
AP exams. Graphing calculator required for Part A of Calculus AB, Calculus BC and Precalculus; Statistics expects a graphing calculator with statistical capability. Scientific or four-function permitted for Biology, Chemistry, Environmental Science and Physics 1, 2, C: Mechanics and C: E&M. Four-function only for Macroeconomics, Microeconomics and Business with Personal Finance. Prohibited on everything else, including both Computer Science exams, absent approved accommodations. College Board’s approved graphing list names the Casio FX-9750 series, FX-9860 series, FX-CG50 and FX-CG-100, alongside the TI-84 Plus CE.
Model, approval, price
| Model | NCEES FE/PE | AP graphing exams | SAT / ACT | US price, Aug 2026 |
|---|---|---|---|---|
| Casio fx-115ES PLUS 2nd Ed. | Approved | Not a graphing calculator | Acceptable (scientific) | Under $20 |
| Casio fx-991CW ClassWiz | Approved | Not a graphing calculator | Acceptable (scientific) | ~$25 |
| Casio fx-991EX ClassWiz | Approved | Not a graphing calculator | Acceptable (scientific) | ~$20–25 |
| Casio fx-9750GIII | Not approved | On approved list (FX-9750 series) | Permitted | ~$60 |
| Casio fx-CG50 | Not approved | On approved list (named) | Permitted | ~$94 |
| TI-84 Plus CE | Not approved | On approved list (named) | Permitted | ~$95–100 |
Check Casio fx-991CW ClassWiz on Amazon
One naming trap worth knowing about
Casio’s US site now lists an fx-9910CW, described as the second-generation fx-991CW. NCEES’s Casio rule is written as a string match: the model name must contain “fx-115” or “fx-991”. “fx-9910CW” does not. We could not find an NCEES statement addressing this model specifically, so we are not going to tell you it is banned — but if you are buying a calculator for the FE or PE, buy one whose model name literally reads fx-115 or fx-991, or write to NCEES first. Do not discover this at the door.
What a ClassWiz does that a TI-84 does not
Natural textbook display puts fractions, surds, integrals and summations on screen the way they appear in a book, in both input and output. TI’s classic line renders most of this linearly. For anyone doing algebra by hand, that matters more than colour.
Both the fx-991EX and fx-991CW include a spreadsheet function — a small grid, 5 columns by 45 rows on the CW, for tabulating and running formulas without leaving the calculator — and a scannable-code output that opens the entered expression as a graph or number line in Casio’s browser-based visualiser. The fx-115ES PLUS 2nd Edition, the older ES-series US model, has neither: natural textbook display, matrix and vector work, equation solving, 40 constants and 40 conversions, and that is the point of it.
The CW interface on the fx-991CW is the newer design: a menu-driven home screen and a Catalog key listing every function rather than hiding them behind shift layers. Faster to learn, slower for anyone with a decade of EX muscle memory.
Check Casio fx-115ES PLUS 2nd Edition on Amazon
What the TI-84 does that no ClassWiz scientific does: graph on the device. Store and run programs on the device. Survive a room where phones are confiscated, which is where the scannable-code trick stops working. If your course requires on-device graphing, a scientific calculator is not a substitute at any price.
The honest verdict, by reader
US high-schooler whose class requires a TI-84. Buy the TI-84. There is no workaround; your teacher’s keystrokes will not match your screen. This is where the premium is unavoidable.
Student who needs graphing but is not brand-locked. The Casio fx-9750GIII at roughly $60 is on College Board’s approved list via the FX-9750 series entry and is permitted on the SAT and ACT, at about 60% of the TI price. The fx-CG50 at roughly $94 buys a colour screen but no longer undercuts the TI-84 by much.
Check Casio fx-9750GIII on Amazon
Engineering student sitting the FE or PE. Own an approved calculator and practise on it, not on your TI. An fx-115ES PLUS 2nd Edition or an fx-991CW costs under $25 and is on the 2026 NCEES list. Buy it early; the exam is not the day to learn a new key layout.
Adult self-learner, hobbyist, working technician. Buy the fx-991CW. Natural display, spreadsheet, distributions, a solver up to four unknowns, complex numbers, 47 constants, solar plus battery, and it will cost you a fifth of a TI-84. If you occasionally need a graph, the browser visualiser covers it.
Summary
The US calculator market is structurally overpriced, and the mechanism is boring: exam-board lists, teacher materials and installed base, not silicon. A ClassWiz at $25 does the arithmetic a TI-84 does; it does not graph, and graphing is what the American classroom standardised on.
Let the exam you actually sit drive the purchase. NCEES is the sharpest: only Casio fx-115 and fx-991 models, the HP 33s and 35s, and TI-30X and TI-36X models are approved for 2026, and the $100 calculator in your bag is not among them. SAT and ACT are permissive and both now hand you a Desmos calculator on screen anyway. AP is the one place a graphing calculator is genuinely required, and only for a handful of exams.
Policies stated here were checked on 16 August 2026 at ncees.org, satsuite.collegeboard.org, act.org and apstudents.collegeboard.org. Check them yourself before test day.
For another case of the same US-versus-Japan pricing split, see our Olight Japan vs US guide. For more buying guides, start at the GadgetHub English hub.
Frequently Asked Questions
- Q: Is the Casio fx-991CW allowed on the NCEES FE exam?
- A: NCEES publishes a calculator policy naming approved models, and for 2026 the Casio entry reads: all fx-115 and fx-991 models, with the rule that a Casio calculator must have 'fx-115' or 'fx-991' in its model name. The fx-991CW contains 'fx-991', so it falls inside that rule. Confirm against ncees.org before your exam date, because the list is revised annually.
- Q: Can I use a TI-84 Plus CE on the FE or PE exam?
- A: No. The NCEES 2026 approved list covers only TI models with 'TI-30X' or 'TI-36X' in the name, plus specific Casio fx-115 and fx-991 models and the HP 33s and 35s. The TI-84 Plus CE is not on it. Engineering students who own a TI-84 need a second, cheap, approved calculator for the exam.
- Q: Does the SAT still require you to bring a calculator?
- A: The digital SAT includes a Desmos graphing calculator built into the Bluebook testing app, available throughout the Math section, so you are not forced to buy hardware. You may still bring your own acceptable calculator. College Board states it no longer maintains a list of permitted graphing calculators and instead asks you to check your model against the prohibited features list.
- Q: What makes a calculator prohibited on the ACT?
- A: The ACT bans computer algebra system models by name, including all TI-89 and TI-92 variants, the TI-Nspire CAS, the HP Prime and HP 48GII/40G/49G/50G, and the Casio fx-CP400 ClassPad, ClassPad 300/m330 and Algebra fx 2.0. Calculators with QWERTY letter keys, phones, and handheld computers are also out. Calculators are permitted only on the mathematics test, not on science.
- Q: Is the ClassWiz a graphing calculator?
- A: No. The fx-991CW and fx-991EX are non-graphing scientific calculators. They generate a scannable code that opens a graph or number line in Casio's web-based visualiser on a phone or laptop, which is useful for study but is not a substitute for on-device graphing and will not help you in a room where phones are banned. If your class requires graphing on the calculator itself, you need an fx-9750GIII, fx-CG50 or a TI-84.