The Graphing Calculator Comparison Guide: TI, Casio, and HP Models Explained

I still remember standing in a Staples aisle with a student's mom, both of us staring at four calculator boxes that all claimed to be "the one every student needs." She asked me a completely fair question: "If they all graph functions, why does the price range from $60 to $150?" That question is really the heart of this whole guide, so let's actually answer it properly instead of just repeating spec sheets at you.

I've taught with the TI-84 line for years, tutored students on Casio models when that's what their school issued, and spent enough time with an HP Prime to know exactly where it shines and where it doesn't. Below is the detailed, brand-by-brand breakdown I wish someone had handed that mom in the calculator aisle including direct links to each manufacturer's own product pages, so you can verify current pricing and specs yourself rather than trusting a stale number in an article.

Why the Price Gap Is Real, Not Just Branding

Before getting into individual models, it helps to understand what you're actually paying for as the price climbs:

• Display technology monochrome vs. full color vs. touchscreen
• Computer Algebra System (CAS) whether the calculator can solve equations symbolically, not just numerically
• Processing power and memory matters for 3D graphing, larger datasets, and programming
• Exam approval CAS models are barred from several major standardized tests, which affects real-world usability even when the hardware is objectively more powerful

Keep that last point in your back pocket. It ends up being the single biggest factor in which calculator is actually right for you, regardless of which one is technically the most advanced.

Texas Instruments Models

TI-84 Plus CE The Industry Standard

This is the calculator most American math classrooms are structured around, and there's a reason it hasn't been dethroned. The TI-84 Plus CE offers core graphing capabilities in a sleek, 30% slimmer design than its predecessor, built for middle school through college, with a full-color display, rechargeable battery, and MathPrint feature that lets students enter expressions exactly as they appear in a textbook.

Real-world pricing: street price generally lands between $110 to $150 depending on color and retailer, though some bundles include a 4-year subscription to the TI-84 Plus CE online calculator at no extra cost.

It's approved for the PSAT/NMSQT, SAT, and ACT college entrance exams, as well as IB Diploma Programme and AP exams that allow or require a graphing calculator, and it deliberately has no Bluetooth, Wi-Fi, or internet access which keeps students distraction-free during tests.

Official product page: education.ti.com TI-84 Plus CE

Free guidebook: TI-84 Plus CE Guidebooks

TI-84 Plus CE Online Calculator The Budget Alternative

Not everyone knows this exists, and it's genuinely useful for schools or families who don't want to buy hardware outright. TI offers an online version of the same calculator for a flat rate of $20 per year less than $2 a month compatible with Chromebooks, Windows, and Mac, with the same button layouts and menu options as the handheld version. It's not a substitute for the physical calculator on an in-person exam, but it's an excellent way to practice or to have a backup if a handheld gets lost.

Official page: TI-84 Plus CE Online Calculator

TI-Nspire CX II and TI-Nspire CX II CAS The Advanced Tier

The TI-Nspire CX II supports Python programming directly on the calculator, letting students write and run code while exploring math, science, and computer science applications. Meanwhile the CAS version lets students manipulate algebraic expressions, solve equations symbolically, and see exact solutions rather than rounded estimates including symbolic integration and differentiation while keeping answers in exact form.

Real-world pricing: the CAS version typically runs close to $180 MSRP, with the non-CAS version usually a bit less.

Here's the detail that catches people off guard, and it deserves its own callout below: the CAS version of this calculator is not allowed on the SAT or ACT.

Official product page: education.ti.com TI-Nspire CX II / CX II CAS

Full specifications: TI-Nspire Specifications

Casio Models

Casio fx-9750GIII The Value Pick

The fx-9750GIII uses Casio's Natural Textbook Display and an intuitive icon-based menu, with feature highlights including graph plotting, probability distribution, vector arithmetic, and spreadsheets, plus programming in Casio Basic and MicroPython. It's approved for the SAT, PSAT, ACT, and AP tests, and includes an Exam Mode that locks specific functionality for testing purposes and it does not include a CAS.

What I appreciate most about this model is that Casio is refreshingly direct about who it's for. Casio recommends this calculator for pre-Algebra all the way up through advanced statistics coursework and the manufacturer's own suggested course list includes Pre-Algebra, Algebra I, Algebra II, Geometry, Trigonometry, Calculus, AP Calculus, AP Statistics, Biology, Chemistry, Physics, and Finance & Business.

Real-world pricing: typically $60 to $70, making it one of the least expensive fully-featured graphing calculators on the market.

Official product page: casioeducation.com fx-9750GIII

Casio fx-CG50 (PRIZM) Casio's Flagship Color Model

If the fx-9750GIII is Casio's answer to the TI-84, the fx-CG50 is closer to a step above it. The fx-CG50 PRIZM supports students from middle school through college with Natural Textbook Display, an intuitive icon menu, 3D graphing, and an improved catalog function for greater engagement with real-life applications. Like the fx-9750GIII, it's approved for the SAT, PSAT, ACT, and AP tests with Exam Mode included, and it does not feature a CAS.

One genuinely distinctive feature: it includes an image plot application that lets you analyze photos and video directly on the calculator useful for physics-style motion analysis projects that most other graphing calculators simply can't do.

Real-world pricing: typically $100 to $115.

Official product page: casioeducation.com fx-CG50

HP Prime G2 The Touchscreen Outlier

The HP Prime doesn't show up in many U.S. classrooms, but it's a genuinely capable machine that deserves a fair look, especially for college-level and professional use. It runs on a fast ARM Cortex-A9 processor with a 3.5-inch multitouch color display, and includes an advanced CAS for solving symbolic equations, simplifying expressions, and performing calculus operations.

What makes it feel different in your hands isn't just the CAS it's the interface. The HP Prime was among the first graphing calculators with a color touchscreen, letting students manipulate complex graphs and geometric images intuitively rather than navigating everything through button presses. Graphs and charts can be moved directly with a finger, and geometric constructions feel closer to drawing on paper than operating a traditional calculator menu.

Real-world pricing: typically $140 to $160.

It is approved for major standardized exams with a secure exam mode that lets teachers set duration, disable specific features, and lock configurations to meet compliance requirements but as with any CAS-equipped calculator, always verify against the specific exam you're taking before assuming it's allowed.

Official datasheet: HP Prime G2 Datasheet (PDF)

Full Comparison Table

Model	CAS?	Display	Typical Price	SAT/ACT Approved?
TI-84 Plus CE	No	Full color	$110 to $150	Yes
TI-84 Plus CE (Online)	No	Full color (software)	$20/year	Practice only, not for in-person exams
TI-Nspire CX II	No	Full color	~$160 to $170	Yes
TI-Nspire CX II CAS	Yes	Full color	~$180	No
Casio fx-9750GIII	No	Monochrome	$60 to $70	Yes
Casio fx-CG50 (PRIZM)	No	Full color	$100 to $115	Yes
HP Prime G2	Yes	Color touchscreen	$140 to $160	No

Prices are approximate street prices at the time of writing and vary by retailer, color, and bundle. Always check the manufacturer or retailer page linked above for current pricing.

The Exam Approval Rule That Actually Matters

If you only remember one thing from this entire guide, make it this: check whether "CAS" appears in the model name before you buy a calculator for a standardized test. Both the SAT and ACT prohibit calculators with computer algebra system functionality, which rules out the TI-Nspire CX II CAS, the HP Prime, the TI-89, and similar models.

For the official, always-current rules rather than a secondhand summary, go straight to the source:

• College Board's official SAT calculator policy
• ACT's official calculator policy
• TI's own exam-approval reference

Policies do change the SAT's CAS ban, for instance, only took effect in 2025 so treat any article (including this one) as a starting point and confirm against the official page before test day.

Which One Should You Actually Buy?

Here's how I'd walk a student or parent through the decision, in order:

1. Check what your school or teacher requires first. If your class is built around one specific model, matching it makes following along in class dramatically easier you can copy keystrokes exactly as the teacher demonstrates them.

2. If you're prepping for a standardized test, rule out anything with "CAS" in the name unless you've separately confirmed it's allowed for your specific exam.

3. If you're choosing freely and want the safest, most broadly supported option, go with the TI-84 Plus CE. It fits algebra through statistics, has the largest base of free tutorials and teacher familiarity, and is approved everywhere that matters.

4. If budget is the deciding factor, the Casio fx-9750GIII covers nearly identical coursework for roughly half the price.

5. If you're already deep into college-level math or engineering and your coursework explicitly calls for CAS, the TI-Nspire CX II CAS or HP Prime G2 are both strong, capable choices just plan on potentially needing a second, non-CAS calculator for standardized testing.

Try Before You Buy

If you want to get a feel for the TI-84 Plus CE's actual workflow the Y= editor, WINDOW and ZOOM menus, graphing, and statistics tools before spending money on hardware, you can test it directly through our free TI-84 Plus CE calculator online. It runs the same interface described throughout this guide, right in your browser, so you can decide if it's the right fit before you commit to buying one.

Whichever calculator you land on, the model matters less than most people assume. A student who's spent real time learning their TI-84's menus will consistently outperform a student holding a fancier calculator they've barely touched. Pick the one that fits your coursework and your exam rules, then actually learn it that's the part that pays off.