SAT & ACT Calculator Policy Checker

Your expert guide to the official rules for calculators used on the SAT and ACT.

Is Your Calculator Allowed?

What are the rules for calculators used on the SAT and ACT?

The policies for calculators used on the SAT and ACT are sets of rules established by the College Board (for the SAT) and ACT, Inc. (for the ACT) to ensure fairness and prevent academic dishonesty during the exams. These rules specify which types of calculators are permitted, which are explicitly prohibited, and any modifications required for approved devices. While a calculator is not strictly necessary to solve any problem on either test, using a familiar and approved tool can significantly improve speed and accuracy on the math sections. The primary goal is to prevent students from using devices with unfair advantages, such as those with Computer Algebra Systems (CAS), internet access, or QWERTY keyboards.

Calculator Policy Logic and Explanation

Instead of a mathematical formula, the eligibility of a calculator is determined by a logical “formula” based on its features. Test makers evaluate a calculator’s hardware and software capabilities to classify it as either ‘Permitted’ or ‘Prohibited’.

The core principle for both tests is that calculators must be standalone, battery-operated devices used for computation only. They must not connect to the internet, make noise, or have features that provide an unfair advantage. One of the biggest distinctions is the prohibition of calculators with a Computer Algebra System (CAS). CAS can perform symbolic manipulation (like factoring ‘x²-1’ into ‘(x-1)(x+1)’), which is a skill the tests are designed to measure. You can find more details in our guide to the ultimate guide to graphing calculators.

Key Policy Variables

This table outlines the key features that determine a calculator’s test eligibility.

Variable (Feature)	Meaning	Unit / Type	Typical Impact on Eligibility
Computer Algebra System (CAS)	Ability to manipulate symbolic algebraic expressions.	Boolean (Yes/No)	Prohibited on SAT. Prohibited on ACT.
QWERTY Keyboard	A typewriter-style keyboard.	Hardware Feature	Prohibited on both tests.
Graphing Capability	Ability to plot functions on a coordinate plane.	Software Feature	Generally Permitted (if non-CAS).
Internet/Wireless Connectivity	Wi-Fi, Bluetooth, or any data communication.	Hardware Feature	Strictly Prohibited.
Power Source	How the calculator is powered.	Hardware Feature	Must be battery-operated. No power cords allowed.
Noise / Printing	Does the calculator make sounds or have a paper tape?	Hardware Feature	Must be silent. Paper tape must be removed.

Practical Examples

Example 1: Checking a TI-Nspire CX II CAS

• Input Model: “TI-Nspire CX II CAS”
• Analysis: The model name explicitly contains “CAS”.
• SAT Result: Prohibited. The SAT calculator policy bans all calculators with CAS functionality.
• ACT Result: Prohibited. The ACT also prohibits calculators with CAS.

Example 2: Checking a TI-84 Plus

• Input Model: “TI-84 Plus”
• Analysis: This is a standard graphing calculator without CAS. It is one of the most common models used by students.
• SAT Result: Allowed. The TI-84 Plus is on the approved list for the SAT.
• ACT Result: Allowed. The TI-84 Plus is permitted on the ACT.

How to Use This Calculator Policy Checker

Using our tool is simple and gives you instant peace of mind before test day. Understanding whether your device is an ACT approved calculator or compliant with the SAT calculator policy is crucial.

1. Enter Your Calculator Model: Type the model name as accurately as possible into the input field above. For example, “TI-84 Plus CE” or “Casio fx-9750GII”.
2. Click “Check Status”: Our tool will process the model against the latest SAT and ACT policy databases.
3. Interpret the Results: The tool will display a clear “Allowed,” “Prohibited,” or “Unknown/Check Manually” status for both the SAT and ACT. It will also provide a brief reason for the classification, such as identifying a prohibited feature like CAS.
4. Reset if Needed: Click the “Reset” button to clear the fields and check another model.

Key Factors That Affect Calculator Eligibility

Several factors determine whether a calculator is allowed. Being aware of these can help you choose the right tool for your test preparation and for the actual exam. Make sure to review your test day checklist to ensure you have everything you need.

• Computer Algebra System (CAS): This is the most common reason for a calculator to be banned. CAS-enabled calculators can solve algebraic equations symbolically, which test-makers consider an unfair advantage.
• QWERTY Keyboards: Any device with a lettered keyboard in the standard QWERTY layout is prohibited to prevent test-takers from typing and storing notes.
• Communication Capabilities: Calculators with Wi-Fi, Bluetooth, infrared ports, or any other method of communicating with other devices are strictly forbidden.
• External Power: Devices that need to be plugged into an electrical outlet are not allowed in the testing room. Your calculator must be battery-powered.
• Noise and Printing: Calculators that make noise or print to a paper tape are prohibited unless the sound is turned off and the tape is removed.
• Non-calculator Functionality: Devices that are also cell phones, tablets, laptops, or smartwatches are not permitted, even if you only intend to use their calculator function.

Frequently Asked Questions (FAQ)

What is the main difference between the SAT and ACT calculator policies?

The policies are very similar. Both prohibit calculators with Computer Algebra Systems (CAS) and QWERTY keyboards. The lists of specifically prohibited models are nearly identical. Historically, the ACT has had slightly more specific rules about modifications (e.g., taping over an infrared port), but the core principles are the same. Always check the official websites for the most current lists before your test.

Can I use the calculator built into the testing software?

Yes, for the digital SAT, a Desmos-powered graphing calculator is built into the testing application (Bluebook) and is available for the entire math section. For the digital ACT, an on-screen calculator is also available. You are still allowed to bring your own approved handheld calculator if you prefer.

What happens if I bring a prohibited calculator?

If you are found with a prohibited calculator, you may be dismissed from the test, and your scores will be canceled. It is your responsibility to ensure your calculator is on the approved list.

Is a TI-84 Plus a good calculator for the SAT and ACT?

Yes, the TI-84 Plus (and its variants like the CE) is one of the most popular and recommended graphing calculators. It is permitted on both the SAT and ACT, powerful enough for all the problems, and widely used in high school math classes. It is often considered the best calculator for SAT prep.

Do I need a graphing calculator, or is a scientific one enough?

A scientific calculator is sufficient to solve all problems. No question on either test *requires* a graphing calculator. However, a graphing calculator can be a powerful tool for quickly solving systems of equations, finding roots of functions, and analyzing graphs, which can save valuable time.

What does “CAS” mean and why is it banned?

CAS stands for Computer Algebra System. This software enables a calculator to perform symbolic math, like factoring `(x^2 – y^2)` into `(x-y)(x+y)` or solving for variables in an equation. This is banned because it tests a calculator’s ability to do algebra, not the student’s.

Can I bring a backup calculator?

Yes, both the SAT and ACT allow you to bring a backup calculator. It must also be an approved model and will be stored under your desk. You must get permission from the proctor before swapping calculators.

Should I buy a new calculator just for the test?

It’s best to use a calculator you are already familiar with. If your current calculator is prohibited, you should acquire an approved one well in advance of the test to practice with it. The digital SAT has an excellent built-in calculator, which is a great option if you don’t want to purchase a new device. Making the right choice is an important part of the ACT vs SAT, which is right for you? decision process.