What Is The Best Calculator For Trigonometry?

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Trigonometry leans on graphs, the unit circle, and a lot of sine, cosine, and tangent, so the right calculator makes the whole subject clearer. A graphing model is ideal here, though a strong scientific calculator covers the essentials. Here are the best calculators for trigonometry in 2026.

At a glance

Calculator	Best for	Type	Screen	Approved
TI-84 Plus CE	Best overall	Graphing	Color	SAT, PSAT, ACT, AP	Check price →
TI-Nspire CX II	Most powerful	Graphing	Color	SAT, PSAT, ACT, AP	Check price →
HP Prime	Best with CAS	Graphing (CAS)	Color touch	SAT, PSAT, AP, IB	Check price →
Casio fx-CG50 PRIZM	Best color for less	Graphing	Color	SAT, ACT, AP	Check price →
TI-30XS MultiView	Best budget scientific	Scientific	4-line	SAT, ACT	Check price →

1. TI-84 Plus CE – Best overall

The TI-84 Plus CE is the calculator most students reach for first. It’s approved for the SAT, PSAT, ACT, and AP exams, the color screen makes graphs easy to read, and since it’s the model most classrooms use, your teacher can always help you with it. It’s thin, holds a charge for weeks, and handles algebra through calculus and statistics.

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What’s good:

Approved on the SAT, PSAT, ACT, and AP exams
Clear color screen
The model most classes already use
Rechargeable battery
Endless apps and tutorials

Worth knowing:

One of the pricier picks

2. TI-Nspire CX II – Most powerful

If you want the most capable calculator that’s still test-legal, this is it. The TI-Nspire CX II does everything the TI-84 does and adds spreadsheets, Python, and the trick of showing a graph, your notes, and a data table on one screen. This is the non-CAS version, so it’s fine for the ACT too. A great choice for a future STEM major.

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What’s good:

Allowed on the SAT, PSAT, and ACT (non-CAS)
Handles advanced math easily
Python built in
Bright, sharp screen
Rechargeable battery

Worth knowing:

Takes longer to learn than a TI-84
Premium price

3. HP Prime – Best with CAS

The HP Prime is the power user’s pick. It has a full-color touchscreen you can pinch and swipe, a built-in computer algebra system, and serious programming tools, yet it’s slim and fast. Note the CAS means it isn’t allowed on the ACT, but it’s approved for the SAT, PSAT, and many AP and IB exams. If you love tinkering, it’s a joy to use.

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What’s good:

Color multi-touch screen
Built-in CAS for symbolic math
Strong programming (PPL and Python)
Approved on SAT, PSAT, AP, and IB
Rechargeable, very slim

Worth knowing:

CAS means no ACT
Different workflow if you grew up on TI

4. Casio fx-CG50 PRIZM – Best color for less

Casio’s fx-CG50 gives you a big color screen and even 3D graphing for noticeably less than the Texas Instruments models. It’s approved for the SAT, ACT, and AP exams, the menus are easy to navigate, and it shows fractions and roots the way they look in your textbook. A smart pick if you want graphing power without the TI price.

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What’s good:

Approved on the SAT, ACT, and AP exams
Large color screen
Can draw 3D graphs
Cheaper than TI graphing models
Textbook-style display

Worth knowing:

Smaller user community
Runs on AAA batteries

5. TI-30XS MultiView – Best budget scientific

The TI-30XS MultiView is the scientific calculator a huge number of classrooms standardize on. The four-line display shows fractions and exponents like your textbook, it runs on solar and battery, and it costs only a few dollars. It’s allowed on the SAT and ACT and it’s tough to wear out.

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What’s good:

Approved on the SAT and ACT
Costs only a few dollars
Four-line textbook display
Solar and battery power
Light and durable

Worth knowing:

No graphing
Not enough alone for higher math

How to choose

Always confirm the official calculator policy for your test first, then decide whether you need graphing or a scientific model, and pick one you can practice with ahead of time. A color screen and rechargeable battery are nice extras.

For trig, the TI-84 Plus CE is the best all-rounder, while the HP Prime and TI-Nspire CX II add power if you want it (just remember the HP Prime’s CAS isn’t allowed on the ACT). On a budget, the TI-30XS handles the basics.

Frequently asked questions

Do you need a calculator for trigonometry?

For most trigonometry courses, yes. You can find exact values like sin 30° = 1/2 or tan 45° = 1 by hand using special triangles and the unit circle, but angles such as 37° need a calculator. A scientific calculator covers sine, cosine, tangent and their inverses, while a graphing calculator also lets you see the shape of trig functions.

What mode should a calculator be in for trigonometry?

Use degree mode when angles are given in degrees and radian mode when they are in radians, such as π/6. Mixing them up is the most common trig calculator mistake: sin(30) gives 0.5 in degree mode but about −0.988 in radian mode. On TI calculators, press the mode key and choose DEG or RAD, and check the setting before every test.

How do you use a scientific calculator for trigonometry?

Check the angle mode first, then press the trig key followed by the angle. For example, in degree mode press sin, type 30, close the parenthesis and press enter to get 0.5. To find an angle from a ratio, use the inverse function: press 2nd then sin, enter 0.5, and the calculator returns 30°. Closing every parenthesis keeps the function applied to the right value.

What is a trigonometry calculator?

A trigonometry calculator is any calculator, handheld or online, that can evaluate sine, cosine and tangent and their inverses, and usually switch between degrees and radians. Most scientific calculators, including the TI-30XS MultiView, do this. Graphing models such as the TI-84 Plus CE can also plot functions like y = sin x, which helps you see amplitude, period and the repeating unit circle pattern.