What Calculator Is Allowed On The Act

Determine if your calculator is permitted on the ACT test. Enter your model below to see what calculator is allowed on the act.

Check Your Calculator’s Status

How the Check Works

This tool checks your calculator model against the official ACT calculator policy. It searches for keywords related to prohibited features like a Computer Algebra System (CAS) and compares your model to a list of explicitly banned calculators. The final determination of what calculator is allowed on the act rests with the test proctor.

What is the ACT Calculator Policy?

The ACT calculator policy outlines the rules for using a calculator on the Math Test. Knowing what calculator is allowed on the act is crucial for test day success. Generally, you can use a four-function, scientific, or graphing calculator, provided it’s not on the prohibited list and doesn’t have specific forbidden features. The policy aims to ensure fairness and prevent any student from having an unfair advantage.

This policy is for students who want to avoid being dismissed from the test for using a prohibited device. All math problems on the ACT can be solved without a calculator, but using a familiar and permitted tool can save significant time and improve accuracy. A common misconception is that all graphing calculators are fine, but many advanced models, especially those with a Computer Algebra System (CAS), are strictly forbidden.

ACT Calculator Rules and Mathematical Explanation

The core of the ACT’s policy isn’t a mathematical formula, but a set of logical rules designed to exclude calculators that can solve complex algebra for the user. The primary rule is the prohibition of calculators with a Computer Algebra System (CAS). A CAS can manipulate algebraic expressions symbolically, which is a skill the ACT is designed to test. For example, a CAS can factor `x^2 – 4` into `(x-2)(x+2)`, while a non-CAS calculator can only work with numbers.

Here’s a breakdown of the key variables in the policy:

Policy Variables Table

Variable / Feature	Meaning	Permitted Status	Typical Examples
Computer Algebra System (CAS)	Ability to solve/manipulate algebraic symbols.	Prohibited	TI-89, TI-Nspire CAS, HP Prime
QWERTY Keyboard	A typewriter-like lettered keyboard.	Prohibited	Devices with physical QWERTY keys.
Infrared Port	Wireless data port for communication.	Allowed ONLY if covered with opaque tape.	HP 38G, 39G, 48G series
Programs/Documents	Stored files or applications.	Allowed ONLY if all CAS programs and documents are removed.	TI-84 Plus games or notes.
External Communication	Wi-Fi, Bluetooth, or cellular capability.	Prohibited	Smartphones, tablets, laptops.

Breakdown of Prohibited Calculator Features

Caption: This chart illustrates the primary reasons a calculator might be prohibited on the ACT. The most common reason is the inclusion of a Computer Algebra System (CAS).

Practical Examples (Real-World Use Cases)

Example 1: Checking a TI-84 Plus CE

• Input: `TI-84 Plus CE`
• Analysis: The tool checks the model name. It does not contain “CAS,” “TI-89,” “TI-92,” or other prohibited identifiers. The model is well-known as a standard graphing calculator without a CAS.
• Output: The calculator status is **LIKELY ALLOWED**. This is a great example of what calculator is allowed on the act and is one of the most popular choices for students. For more details, you can review our guide to ACT math tips.

Example 2: Checking a TI-89 Titanium

• Input: `TI-89 Titanium`
• Analysis: The tool immediately flags the “TI-89” part of the model name. This model is explicitly on the ACT’s prohibited list because it contains a powerful CAS.
• Output: The calculator status is **PROHIBITED**. Using this calculator would result in dismissal from the test. Understanding the ACT vs SAT comparison on calculator policies is also helpful.

How to Use This ACT Calculator Checker

1. Enter Your Model: Type the full model name of your calculator into the input field above.
2. Review the Result: The tool will instantly provide a status: LIKELY ALLOWED, PROHIBITED, or CONDITIONAL.
3. Check Intermediate Values: See the specific checks (CAS, Prohibited List) to understand *why* your calculator received its status.
4. Read the Guidance: For “Conditional” results, follow the instructions provided (e.g., “Cover infrared port”). Always double-check with the official ACT calculator policy.

This tool helps you quickly determine what calculator is allowed on the act, but the final decision is always with the testing staff on test day. If you are unsure, it’s wise to bring a backup calculator that is definitely on the approved list, such as a basic scientific model. Consider taking one of our free ACT practice tests to get comfortable with an approved calculator.

Key Factors That Affect Calculator Eligibility

Several factors determine if a calculator is permitted. Understanding these is key to knowing what calculator is allowed on the act.

• Computer Algebra System (CAS): This is the most critical factor. If a calculator can symbolically solve equations (not just numerically), it is banned.
• QWERTY Keyboard: Any calculator with a typewriter-style keyboard is prohibited to prevent storing notes.
• Communication Capabilities: Devices with Wi-Fi, Bluetooth, or any form of internet or remote access are not allowed. This includes phones and smartwatches.
• Power Cords: A calculator must be battery-operated. Models that require an external power source are forbidden.
• Noise and Printing: Calculators that make noise must be muted, and those with paper tape must have the tape removed.
• Explicitly Prohibited List: The ACT publishes a list of specific models that are banned. This includes series like the TI-89, TI-92, and HP Prime.

Frequently Asked Questions (FAQ)

Is the TI-84 Plus allowed on the ACT?

Yes, all versions of the TI-84 Plus (including the Plus CE) are allowed on the ACT. They do not have a CAS and are a popular choice for test-takers. It’s an excellent tool when figuring out what calculator is allowed on the act.

What happens if I bring a prohibited calculator?

If you are found using a prohibited calculator, you will be dismissed from the test, and your scores will be voided. It is your responsibility to ensure your calculator is compliant.

Can I use my phone’s calculator?

No. Cell phones, tablets, smartwatches, and laptops are strictly prohibited from being used as calculators.

What is a “Computer Algebra System” (CAS)?

A CAS is software that allows a calculator to manipulate mathematical expressions in a symbolic form. For example, it can solve for variables without needing to plug in numbers. This functionality is banned by the ACT.

Do I have to clear the memory on my calculator?

The ACT requires that you remove all programs with CAS functionality and any stored documents. While proctors may not check every calculator’s memory, it is a rule, and you should comply to be safe.

Is the TI-Nspire allowed?

This is a tricky one. The TI-Nspire (non-CAS) model is permitted. However, the TI-Nspire CAS model is strictly prohibited. You must check your specific model carefully.

Are there any online calculators available during the test?

For the computer-based ACT, a basic on-screen calculator is available. However, it is generally less functional than a handheld scientific or graphing calculator. Knowing what calculator is allowed on the act beforehand gives you an advantage.

Should I bring a backup calculator?

Yes, bringing a backup is highly recommended. Your primary calculator could fail, or its batteries could die. A simple, approved scientific calculator is a great backup option.