Can I Use a Calculator While Taking the ACT Test?

An essential guide and policy checker for test day.

ACT Calculator Policy Checker

Use this tool to determine if your calculator is likely allowed on the ACT. Check any features your calculator has that are listed below.

This is common on models like the TI-89, TI-Nspire CAS, and HP Prime.

Any calculator with a typewriter-like keyboard is prohibited.

No devices that can communicate wirelessly are allowed.

These electronic devices are strictly forbidden.

Calculators must be battery-operated.

What is the ACT Calculator Policy?

The official policy for whether you can use a calculator while taking the ACT test is designed to ensure fairness and test security. You are allowed to use a calculator on the Mathematics Test only, not on any other section like Reading, English, or Science. While you can use a wide range of calculators, including most four-function, scientific, and graphing models, there is a specific list of prohibited features and devices.

The core idea is to prevent any student from having an unfair advantage. This means any calculator that can perform symbolic algebraic manipulation (through a Computer Algebra System or CAS), communicate wirelessly, or access the internet is strictly forbidden. The questions on the ACT are designed to be solvable without a calculator, but using a familiar and permitted one can help you save time and check your work efficiently.

Permitted vs. Prohibited Calculators: The Key Differences

Understanding what makes a calculator prohibited is key. The ACT is very specific about certain models and types of functionality that are not allowed in the testing room. Our policy checker above simplifies this, but the rules boil down to a few main points.

Calculators with any of the following are strictly prohibited:

• Computer Algebra System (CAS): This is the most common reason a graphing calculator is banned. CAS can solve algebraic equations, simplify expressions, and perform calculus operations symbolically, which undermines what the test is designed to measure.
• QWERTY Keyboards: Any device with a lettered keyboard like a computer is not allowed.
• Wireless Communication: Devices with Wi-Fi, Bluetooth, or infrared ports that aren’t covered are banned.
• External Power Needs: Calculators requiring an electrical outlet are not permitted.
• Phones, Tablets, and Computers: No smart devices of any kind can be used as a calculator.

Examples of Permitted and Prohibited Calculators

Commonly Permitted	Strictly Prohibited
Most TI-83 and TI-84 models (Plus, CE, etc.)	Texas Instruments TI-89 and TI-92
TI-Nspire (non-CAS version only)	TI-Nspire CAS
Most Casio and Sharp scientific calculators	HP Prime and HP 50G
Any standard four-function calculator	Any smartphone, tablet, or laptop

Practical Examples

Example 1: Checking a TI-84 Plus

A student has a Texas Instruments TI-84 Plus. They use the checker above and confirm it does not have a CAS, a QWERTY keyboard, or wireless capabilities. The result is “Likely Permitted.” This is correct, as the entire TI-83/TI-84 series is one of the most popular and widely accepted calculators for the ACT.

Example 2: Checking a TI-89 Titanium

Another student has a TI-89 Titanium. When they use the checker, they must check the box for “Does it have a Computer Algebra System (CAS)?”. The tool immediately flags it as “Prohibited”. The reason is that the TI-89’s built-in CAS functionality gives an unfair advantage by solving algebraic problems automatically, which is against ACT policy.

How to Use This ACT Calculator Checker

Using our calculator policy tool is simple and provides instant feedback:

1. Identify Features: Look at your calculator and compare it to the checklist. Does it have a “CAS” button or logo? Does it have a full alphabet keyboard?
2. Check the Boxes: Select the checkbox for each prohibited feature your calculator has. The result will update in real-time.
3. Review the Result: The box at the bottom will turn green for “Likely Permitted” or red for “Prohibited,” along with a brief explanation.
4. Disclaimer: Always remember that the final decision rests with the test proctor on test day. Our tool interprets the official policy, but a proctor can disqualify any device they deem suspicious.

Key Factors That Affect Your Calculator Choice

• Familiarity is Key: Don’t buy a powerful new calculator right before the test. Use one you are comfortable with to avoid wasting time figuring out its functions.
• Battery Life: Make sure your calculator has fresh batteries. A dead calculator is the same as no calculator. Bringing a spare set of batteries is a great idea.
• No Sharing Allowed: You cannot share a calculator with another student during the test.
• Proctor Discretion: The test center staff have the final say. If your calculator has been modified (e.g., tape over an infrared port), make sure it’s done neatly to avoid questions.
• Memory Resets: Some proctors may ask you to clear the memory on your graphing calculator before the test begins to ensure no formulas or notes are stored.
• Digital Test Version: If you are taking the digital ACT, an on-screen graphing calculator (Desmos) will be available, but you can still bring your own approved handheld calculator.

Frequently Asked Questions (FAQ)

What happens if I bring a prohibited calculator to the test?

If a proctor discovers you are using a prohibited calculator, you may be dismissed from the test, and your scores will be voided.

Is the TI-Nspire allowed on the ACT?

It depends on the model. The standard TI-Nspire is permitted. However, the TI-Nspire CAS is strictly prohibited because of its Computer Algebra System.

Can I use my phone’s calculator if it’s in airplane mode?

No. All phones, smartwatches, and other “smart” devices are banned, regardless of their settings.

Do I really need a graphing calculator for the ACT?

No. The ACT states that every single math problem can be solved without a calculator. A scientific calculator is often sufficient, but a graphing calculator can be faster for certain problems if you know how to use it.

What is the best calculator for the ACT?

The “best” calculator is the one you are most familiar with that is also permitted. The TI-84 Plus series is a very popular and safe choice.

Is the calculator policy the same for the SAT?

No, the policies are similar but not identical. You should always check the specific policy for each test you are taking. For example, the SAT has a “calculator” and “no-calculator” math section, while the ACT allows a calculator for its entire math test.

What does “CAS” mean?

CAS stands for Computer Algebra System. It’s a sophisticated software that can manipulate mathematical expressions in a symbolic way, like solving for variables or factoring polynomials, which is not allowed.

Are there any modifications I need to make to my calculator?

Sometimes. If your calculator has an infrared data port (like some older HP models), you must cover it with opaque tape. If it makes noise, the sound must be turned off.