Can I Use a TI-84 on the ACT?

An instant checker and detailed guide to the official ACT calculator policy.

ACT Calculator Permissibility Checker

The Definitive Guide to Using a TI-84 on the ACT

One of the most common questions students ask before test day is: can I use a TI-84 calculator on the ACT test? The short answer is yes, but the official ACT calculator policy has important details you must know to avoid issues. This guide provides a clear breakdown of the rules, which calculators are allowed, and which are strictly prohibited.

What is the Official ACT Calculator Policy?

The ACT allows examinees to use a calculator on the Mathematics Test section only. The policy is designed to ensure fairness and test security. While most four-function, scientific, and graphing calculators are permitted, there are critical restrictions. The most significant rule is the prohibition of calculators with a built-in or downloaded Computer Algebra System (CAS). CAS functionality allows calculators to solve algebraic equations symbolically, which is considered an unfair advantage. Devices with QWERTY keyboards, cell phones, and laptops are also banned.

TI-84 Models and ACT Rules: A Clear Breakdown

The TI-84 family is one of the most popular for high school math. Here’s how each model fits into the ACT’s rules.

• TI-84 Plus: Fully permitted. This is a standard graphing calculator without a CAS.
• TI-84 Plus CE: Fully permitted. This is a newer version with a color screen but also does not have a CAS.
• TI-84 Plus CE Python Edition: Permitted. While it can run Python programs, it does not have an integrated CAS, making it compliant with ACT rules.

The key takeaway is that the entire TI-84 series is generally safe for the ACT because it lacks the prohibited CAS feature. However, proctors may inspect your calculator, and you must ensure no prohibited programs are stored on it.

Calculator Model ACT Status

Calculator Model	Status	Reason
TI-84 Plus / Plus CE	Permitted	Standard graphing calculator, no CAS.
TI-83 Plus	Permitted	Older graphing calculator, no CAS.
TI-Nspire (non-CAS)	Permitted	Specifically allowed by ACT as it lacks the CAS module.
TI-89 / TI-92	Prohibited	Contains a built-in Computer Algebra System (CAS).
TI-Nspire CAS	Prohibited	The CAS version is explicitly banned.
HP Prime / HP 50g	Prohibited	Contains advanced CAS features.

How to Use This Permissibility Checker

Using the tool is straightforward and designed to give you an immediate answer.

1. Select Your Model: Click the dropdown menu and find your calculator model in the list. The list includes the most common models students ask about.
2. View the Result: The tool will instantly display the calculator’s status: Permitted, Prohibited, or Permitted with Conditions.
3. Read the Explanation: Below the status, a detailed explanation tells you *why* your calculator is or isn’t allowed, usually referencing the core rule about Computer Algebra Systems (CAS).

Key Factors That Affect Calculator Permissibility

Understanding these factors will help you determine if any calculator is allowed.

• Computer Algebra System (CAS): This is the number one reason a calculator is banned. Models like the TI-89, TI-Nspire CAS, and HP Prime are prohibited for this reason.
• QWERTY Keyboard: No calculators with a typewriter-style keyboard are allowed.
• Communication: Calculators cannot have any form of internet or Bluetooth connectivity.
• Stored Programs/Documents: Even on a permitted calculator like a TI-84, you may be asked to clear the memory. Proctors can inspect your device for stored formulas, notes, or programs that offer an unfair advantage.
• Noise and Peripherals: Calculators that make noise must be muted. If it has a paper tape, the tape must be removed.
• Power Source: Your calculator must be battery-operated. You cannot plug it into an outlet during the test.

Frequently Asked Questions (FAQ)

Is the TI-84 Plus CE allowed on the ACT?

Yes, the TI-84 Plus CE is explicitly allowed on the ACT because it does not contain a Computer Algebra System (CAS).

What about the TI-Nspire?

This is a tricky one. The standard TI-Nspire (non-CAS) is permitted. However, the TI-Nspire CAS is strictly prohibited. You must know which version you have.

Do I have to clear the memory on my TI-84?

The official policy states you must remove any programs with CAS functionality. While not always enforced, a proctor has the right to inspect your calculator and ask you to clear its memory. It is best to back up any important files and be prepared to clear your device.

Can I use a calculator on all sections of the ACT?

No, calculators are only permitted for the Mathematics section.

What happens if I bring a prohibited calculator?

You will not be allowed to use it. If you are caught using one during the test, you may be dismissed, and your score will be voided.

Are phone calculators allowed?

No. All phones, tablets, smartwatches, and laptops are strictly forbidden for use as a calculator.

What is a Computer Algebra System (CAS)?

A CAS is a sophisticated program that can manipulate mathematical expressions in a symbolic way. For example, it can solve for variables in an equation (e.g., solve ‘x + 2y = 5’ for ‘x’) or find the derivative of a function symbolically, rather than just computing numbers. This is why it’s banned.

Is every problem on the ACT Math test solvable without a calculator?

Yes, the ACT states that every problem can be solved without a calculator. However, using a familiar, permitted calculator wisely can save significant time.