You may use your calculator only while you are working on the Mathematics Test. At all other times, it must be turned off and put away.
You may use only the mathematics functions of your calculator—if your calculator has other functions (such as games) you may not use those functions
ACT is very strict on the types of calculators that are permitted and when the calculators may be used. If testing staff find that you are using a prohibited calculator or are using a calculator on any test other than the Mathematics Test, you will be dismissed and your answer document will not be scored. If ACT determines later that you used a prohibited calculator or that you used a calculator on a test other than the Mathematics Test, your scores will be cancelled.
Using the TI-89 is the most common reason students are dismissed from the ACT for prohibited calculator use.
You may use any four-function, scientific, or graphing calculator, except for the following:
Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.
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