Is Your TI-84 Calculator Allowed on the ACT?

A quick and easy tool to determine if your specific calculator model is permitted for use on the ACT exam.

ACT Calculator Eligibility Checker

What is the ACT Calculator Policy?

The ACT has a specific policy detailing which calculators are allowed and which are prohibited during the math portion of the test. The main goal of this policy is to ensure fairness and prevent any student from having an unfair advantage. While you can solve every problem on the ACT without a calculator, using an approved one like a TI-84 Plus can significantly improve your speed and accuracy. The core of the policy is to ban calculators that can perform complex algebraic manipulations (through a Computer Algebra System or CAS) or that have features resembling a computer, like a QWERTY keyboard. [1, 6]

Understanding whether you can use your TI-84 calculator on the ACT is crucial. Generally, most models in the TI-84 family are permitted, but it’s essential to confirm your specific model and ensure it doesn’t have any prohibited software installed. [2, 5]

The ACT Calculator “Formula”: A Checklist for Compliance

There isn’t a mathematical formula to determine if you can use your TI-84 calculator on the ACT, but there is a clear logical one. You can think of it as a checklist. If your calculator fails any of these checks, it is not allowed. This calculator automates this checklist for you.

Key Variables for ACT Calculator Eligibility

Variable	Meaning	Allowed Value / State	Typical Range
CAS Feature	Computer Algebra System	Must be ‘No’ / Not Present	Present on models like TI-89, TI-Nspire CAS
Keyboard Style	Letter input method	Must not be QWERTY	Prohibited on some older devices
Power Source	How the device is powered	Must be battery-operated	Devices requiring an outlet are banned
Model Name	Specific product name	Must not be on the prohibited list	e.g., TI-84 Plus (Allowed), TI-89 (Banned)

Practical Examples

Let’s see how the policy applies to common calculator models.

Example 1: The Standard Approved Calculator

• Inputs: Model = “TI-84 Plus CE”, Has CAS = No, Has QWERTY = No, Needs Power = No.
• Units: These are boolean checks (Yes/No).
• Result: ALLOWED. The TI-84 Plus CE does not have a CAS, a QWERTY keyboard, or require external power, making it perfectly fine for the ACT. [5]

Example 2: The Prohibited CAS Calculator

• Inputs: Model = “TI-89 Titanium”, Has CAS = Yes, Has QWERTY = No, Needs Power = No.
• Units: Boolean checks (Yes/No).
• Result: NOT ALLOWED. The TI-89 series is explicitly banned because it contains a Computer Algebra System (CAS). [4, 6]

How to Use This ACT Calculator Policy Checker

Using this tool is straightforward and gives you an instant answer about your calculator’s eligibility.

1. Enter Your Calculator Model: Type the model name exactly as it appears on your device (e.g., “TI-84 Plus”).
2. Answer the Feature Questions: Check the boxes if your calculator has any of the listed prohibited features. If you’re unsure if your calculator has a CAS, a quick online search for your model name + “CAS” will usually provide an answer. For a TI-84, the answer is no.
3. Check Eligibility: Click the “Check Eligibility” button.
4. Interpret the Results: The tool will provide a clear “ALLOWED,” “NOT ALLOWED,” or “REVIEW REQUIRED” status along with an explanation based on the official ACT Calculator Policy.

Key Factors That Affect ACT Calculator Eligibility

Several factors determine whether you can use a TI-84 or another calculator on the ACT. Here are the six most critical ones:

• Computer Algebra System (CAS): This is the most common reason for a calculator being banned. A CAS can solve algebraic equations symbolically, which the ACT considers a significant advantage. The TI-89 and TI-Nspire CAS are classic examples. [4]
• QWERTY Keyboard: Any calculator with a keyboard laid out like a computer (QWERTY) is prohibited. This prevents the use of devices that are more like pocket computers. [1]
• Wireless Communication: Calculators with Wi-Fi, Bluetooth, or any other form of wireless communication are strictly forbidden.
• Need for an Electrical Outlet: All calculators must be battery-powered. You cannot use a device that needs to be plugged in during the test.
• Noise and Printing: If your calculator makes noise, it must be muted. If it has a paper tape printing function, the tape must be removed before the test. [7]
• Prohibited Model List: The ACT explicitly lists certain models as prohibited. It is always wise to check your model against the latest official list from ACT’s website. You can learn more about ACT approved calculators to be safe.

Frequently Asked Questions (FAQ)

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

Yes, the TI-84 Plus CE is allowed on the ACT. It is one of the most popular and recommended calculators for the test because it is a powerful graphing calculator without a prohibited CAS. [5]

2. How do I know if my TI-84 has a CAS?

Standard TI-84 models (Plus, Silver Edition, CE) do not come with a built-in CAS. The prohibited Texas Instruments models are typically the TI-89, TI-92, and the TI-Nspire with “CAS” in its name. If you are unsure, you should clear your calculator’s memory before the test, as some prohibited programs could be installed. [9, 10]

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

No, calculators are only permitted on the Mathematics section of the ACT. You may not use a calculator on the English, Reading, or Science sections. [2]

4. What happens if I bring a banned calculator?

If a test proctor discovers you have a prohibited calculator, you may be dismissed from the test, and your scores could be canceled. It is your responsibility to ensure your calculator is compliant. [6]

5. Do I have to clear the memory on my TI-84 before the test?

It is a highly recommended practice. Proctors may inspect your calculator, and they can require you to clear the memory to ensure no prohibited programs or data are stored. Back up anything important before test day. [9]

6. Can I share my calculator with another student?

No, sharing calculators is not permitted under any circumstances during the test. You should also bring a backup calculator or extra batteries just in case. [2, 8]

7. What’s the difference between a TI-84 and a TI-89?

The main difference relevant to the ACT is that the TI-89 has a built-in Computer Algebra System (CAS), while the TI-84 does not. This is why the TI-89 is banned and the TI-84 is allowed.

8. Can I use a calculator app on my phone or watch?

Absolutely not. All cell phones, smartwatches, laptops, tablets, or any other communication devices are strictly prohibited from being used during the test. [3]