Can Calculators Be Used On The ACT?

Check if your device is permitted and calculate your time efficiency for the ACT Math section.

What is the ACT Calculator Policy?

The question of can calculators be used on the act is one of the most frequent concerns for high school students. Unlike some other standardized tests, the ACT allows the use of a calculator, but only during the Math section. You cannot use a calculator for the Reading, English, or Science portions of the exam. This policy is strictly enforced by proctors to ensure testing equity across all participants.

Understanding can calculators be used on the act requires knowing the difference between “permitted” and “prohibited” features. The ACT organization maintains a specific list of banned devices, primarily focusing on those that have “Computer Algebra System” (CAS) capabilities. These devices can solve algebraic equations or perform symbolic manipulation, which the ACT aims to test manually. Most graphing calculators, like the TI-84, are perfectly acceptable, while others like the TI-89 are forbidden.

Using the right tool is essential for speed and accuracy. When students ask can calculators be used on the act, they should also consider the physical requirements: your calculator must not have a power cord, make noise, or have a QWERTY-style keyboard. If your device is questionable, proctors are authorized to confiscate it for the duration of the test, leaving you to finish the Math section by hand.

can calculators be used on the act Formula and Mathematical Explanation

While the ACT doesn’t have a formula for “permission,” there is a mathematical way to calculate the efficiency gain of using one. We calculate the Time Savings Index (TSI) using the following variables:

Variable	Meaning	Unit	Typical Range
Tm	Manual Time per Question	Seconds	60 – 120
Tc	Calculator Time per Question	Seconds	30 – 60
Qt	Total Questions	Integer	60
E	Efficiency Gain	Percentage	20% – 60%

The Efficiency Formula:
E = ((Tm - Tc) / Tm) * 100

This formula determines how much time is recovered by automating basic arithmetic and graphing. For example, if a manual solution takes 90 seconds and a calculator-assisted solution takes 45 seconds, the efficiency gain is 50%. This time is crucial because the ACT Math section provides exactly 60 minutes for 60 questions—one minute per question.

Practical Examples (Real-World Use Cases)

Example 1: The TI-84 Plus User

A student uses a TI-84 Plus. Since this device is on the allowed list, the answer to can calculators be used on the act for them is a definite “Yes.”
Inputs: Manual Time = 100s, Calculator Time = 55s.
Output: Time saved over 60 questions = 2,700 seconds (45 minutes).
Interpretation: This student gains a significant advantage by finishing simple arithmetic faster, allowing more time for complex trigonometry problems.

Example 2: The TI-89 CAS Mistake

A student brings a TI-89 Titanium. Because this model features a Computer Algebra System, the answer to can calculators be used on the act is “No.”
Result: Prohibited. If they use it, they risk score cancellation. If they are caught before the test, they must work without a calculator, increasing their average time per question to 110s, making it impossible to finish the 60 questions in 60 minutes.

How to Use This can calculators be used on the act Calculator

1. Select your Model: Start by picking your calculator from the dropdown list. This uses the current ACT official list to determine status.
2. Identify CAS: If your model is not listed, check the faceplate for the letters “CAS.” If they exist, the device is likely prohibited.
3. Enter Your Speed: Input how long it takes you to solve a medium-difficulty problem with and without digital assistance.
4. Review the Efficiency Result: Look at the “Time Saved” value. If this is high, your calculator strategy is effective.
5. Observe the Chart: The visual breakdown shows the ratio of time spent on calculation versus logic.

Key Factors That Affect can calculators be used on the act Results

• CAS Technology: The most significant factor. Any device that can factor polynomials or simplify radical expressions symbolically is banned.
• Keyboard Layout: Calculators with letter keys in a QWERTY format (like a computer) are strictly prohibited.
• Communication Capabilities: Devices that use infrared, Bluetooth, or Wi-Fi to communicate with other devices are not allowed.
• Screen Size and Stylus: Devices that are essentially tablets or have touch-screens with stylus input (like the Casio ClassPad) are usually banned.
• Paper Tape and Noise: If your calculator prints or makes audible beeps, it must be silenced or the printer removed to be used.
• Memory Cleansing: While the ACT doesn’t require clearing memory, programs that store actual test questions or “cheat sheets” are illegal and lead to disqualification.

Frequently Asked Questions (FAQ)

Can calculators be used on the act Science section?
No, calculators are only permitted during the Math section. You must put them away before the Science section begins.

What happens if my calculator is prohibited?
If a proctor sees a prohibited calculator, they will either take it away or dismiss you from the testing center immediately.

Are the TI-84 Plus CE models allowed?
Yes, the TI-84 Plus CE is one of the most popular permitted calculators because it lacks CAS functionality.

Can I use a calculator on my phone?
Absolutely not. Phones, tablets, and wearable technology (like smartwatches) are strictly banned throughout the entire test.

Do I have to clear my calculator’s memory?
The ACT does not require you to clear memory, but you cannot have any prohibited programs or notes stored on the device.

Can I share a calculator with a friend?
Sharing calculators during the exam is strictly prohibited and will result in both students being dismissed.

Are four-function calculators allowed?
Yes, even a basic four-function calculator is permitted, though it may not be as helpful for advanced trigonometry.

What if my calculator has a stylus?
If the calculator uses a stylus or is a pen-input device, it is generally prohibited by ACT policy.

Related Tools and Internal Resources

• Official ACT Calculator Policy Guide – A detailed breakdown of every single rule.
• Top 5 Permitted Calculators for ACT – Which models provide the best advantage.
• ACT Math Speed Strategies – How to solve problems faster with your device.
• TI-84 vs TI-Nspire Comparison – Choosing the right tool for the job.
• Full ACT Practice Exams – Test your calculator skills in a timed environment.
• The Pre-Test Checklist – Don’t let your battery die in the middle of the test.