Calculators That You Cannot Used On The Act

Determine if your device is one of the calculators that you cannot use on the ACT test.

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Enter your calculator’s features to see its status.

Checked Features Summary

Your inputs will be summarized here once you check them.

What are ACT Prohibited Calculators?

An ACT prohibited calculator is any electronic device that violates the official ACT calculator policy, designed to ensure fairness and prevent cheating. The policy outlines specific features and models that are among the calculators that you cannot use on the ACT. The most common reason for a calculator to be prohibited is the inclusion of a Computer Algebra System (CAS). These systems can perform symbolic manipulation (like solving for x in an equation), which provides an unfair advantage. Other banned features include QWERTY keyboards, wireless communication, and the need for an external power source. Understanding this policy is crucial for any student preparing for the ACT Math test.

This policy primarily affects students who own high-end graphing calculators. While most scientific calculators and basic graphing calculators (like the TI-84 series) are permitted, advanced models like the TI-89 are explicitly banned. A common misconception is that all graphing calculators are forbidden, but this is untrue. The key is the functionality; if the device can perform tasks that are part of the test questions themselves, it’s likely one of the calculators that you cannot use on the ACT. Always check your specific model against the official ACT guidelines before test day.

The Formula Behind the ACT Prohibited Calculators Check

The “calculation” for determining if a device is an ACT prohibited calculator is not a mathematical formula but a logical one based on a set of rules. The device is flagged as “PROHIBITED” if it meets one or more of the following conditions:

1. The model name explicitly matches a known banned calculator (e.g., TI-89, HP Prime).
2. The device has a Computer Algebra System (CAS).
3. The device features a QWERTY-style keyboard.
4. The device has any wireless, Bluetooth, or internet connectivity.
5. The device is a general-purpose computer like a smartphone, tablet, or laptop.

Our calculator applies these rules in real-time. This logic ensures a clear and immediate answer for students wondering about the eligibility of their device and if it’s one of the calculators that you cannot use on the ACT.

Variables Table

Variable	Meaning	Unit	Typical Range
Model Name	The specific model of the calculator.	Text	e.g., “TI-84 Plus CE”, “Casio fx-9750GII”
Has CAS	Presence of a Computer Algebra System.	Boolean (Yes/No)	Yes or No
Has QWERTY	Presence of a typewriter-style keyboard.	Boolean (Yes/No)	Yes or No
Has Wireless	Presence of communication features.	Boolean (Yes/No)	Yes or No

Explanation of the logical inputs used to determine if a calculator is prohibited.

Practical Examples of ACT Prohibited Calculators

Example 1: The Prohibited Calculator

A student owns a Texas Instruments TI-89 Titanium. They want to know if they can use it on the ACT.

• Input – Model: “TI-89 Titanium”
• Input – Has CAS: Yes
• Output – Status: PROHIBITED
• Interpretation: The calculator is explicitly banned because it contains a Computer Algebra System. The student must find an alternative, approved calculator for the test. This is a clear example of one of the calculators that you cannot use on the ACT.

Example 2: The Permitted Calculator

Another student has a Texas Instruments TI-84 Plus CE. They check its eligibility.

• Input – Model: “TI-84 Plus CE”
• Input – Has CAS: No
• Input – Has QWERTY: No
• Output – Status: LIKELY PERMITTED
• Interpretation: This calculator does not have a CAS, a QWERTY keyboard, or any other prohibited features. It is allowed for use on the ACT. The student can confidently bring this calculator to the test.

How to Use This ACT Prohibited Calculators Checker

Using this tool to check for ACT prohibited calculators is a straightforward process designed to give you peace of mind before your test day. Follow these simple steps:

1. Enter Model Name: Start by typing your calculator’s model name into the first field. Our tool checks this against a list of specifically banned models for an instant result.
2. Answer Feature Questions: Use the dropdown menus to answer “Yes” or “No” to the questions about your calculator’s features, such as whether it has a Computer Algebra System (CAS) or a QWERTY keyboard.
3. Review Instant Results: As you provide information, the result section will update in real-time. A green “LIKELY PERMITTED” means you’re probably safe, while a red “PROHIBITED” indicates your device is one of the calculators that you cannot use on the ACT.
4. Check the Explanation: The tool will provide a brief explanation for the result, telling you exactly why your calculator is or isn’t allowed. This helps you understand the specific rule your device may violate. For more information on exam rules, review the official ACT test rules.

Key Factors That Affect Calculator Eligibility

Several factors determine whether a device is classified among the calculators that you cannot use on the ACT. Understanding these will help you choose the right tool for test day.

1. Computer Algebra System (CAS)

This is the most critical factor. A CAS allows a calculator to perform symbolic algebra (e.g., factor, expand, and solve equations with variables). The ACT prohibits these because they solve the exact types of problems found on the math test, providing an unfair advantage. Checking for CAS is the first step in verifying any graphing calculator.

2. QWERTY Keyboard

Calculators with a typewriter-style (QWERTY) keyboard are banned. This rule prevents the use of devices that could be used to store notes or communicate, blurring the line between a calculator and a pocket computer.

3. Communication Capability

Any device with wireless, Bluetooth, cellular, or internet connectivity is strictly prohibited. This is a security measure to prevent any form of external communication or data access during the exam. This is a core reason why smartphones are on the list of calculators that you cannot use on the ACT.

4. Stylus or Pen-Input

Devices that use a stylus or are pen-based, such as tablets or some advanced Casio models, are generally forbidden. This prevents the use of devices that could function as electronic writing pads. An important part of your test day checklist is ensuring your calculator is button-operated.

5. Power Source

Calculators needing to be plugged into an electrical outlet are not allowed. Your calculator must be battery-operated to ensure it can function in the testing environment without access to power cords.

6. Specific Model Lists

The ACT explicitly names certain models as prohibited. These lists, which include calculators like the TI-89, TI-92, and HP Prime, serve as a definitive guide to the most common calculators that you cannot use on the ACT.

Frequently Asked Questions (FAQ)

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

Yes, all versions of the Texas Instruments TI-84 Plus family (including the Plus, Plus C Silver Edition, and Plus CE) are permitted on the ACT, as they do not contain a Computer Algebra System (CAS).

2. Why is the TI-89 on the list of calculators that you cannot use on the ACT?

The TI-89 is prohibited because it has a built-in Computer Algebra System (CAS), which can solve algebraic equations symbolically. This functionality is against the ACT’s rules to ensure a fair testing environment.

3. Can I use my smartphone’s calculator app?

No. All smartphones, tablets, smartwatches, and laptop computers are banned from the testing room. They are considered ACT prohibited calculators due to their communication capabilities and ability to store information.

4. What happens if I bring one of the calculators that you cannot use on the ACT?

If a test proctor finds you are using a prohibited calculator, you may be dismissed from the test, and your score will be voided. It is your responsibility to ensure your calculator is compliant before the test begins.

5. Is the TI-Nspire allowed?

It depends. The standard TI-Nspire (non-CAS) model is allowed. However, the TI-Nspire CAS model is explicitly prohibited. You must check your calculator’s casing to see if the letters “CAS” are present.

6. Do I need to clear my calculator’s memory before the test?

While the ACT policy states that calculators with programs or documents must be cleared, enforcement can vary. The safest approach is to clear any stored programs or notes to avoid any issues with the proctor. Following an ACT math prep guide can help you know what to study instead of what to store.

7. Are scientific calculators allowed on the ACT?

Yes, almost all standard scientific calculators are allowed. They do not have the advanced graphing or symbolic features that are found on ACT prohibited calculators, making them a safe choice for the exam.

8. What if my calculator is not on the official prohibited list but has a banned feature?

The list is not exhaustive. The rules about features (like CAS or QWERTY keyboards) take precedence. If your calculator has a prohibited feature, you cannot use it, even if the specific model number is not listed.