The ACT permits the use of certain calculators during the mathematics section. A permitted device typically includes basic scientific, graphing, and four-function calculators. However, calculators with Computer Algebra System (CAS) functionality are generally prohibited. For example, a TI-84 Plus is usually allowed, while a TI-89 Titanium is not.
Adherence to the calculator policy ensures fairness and standardization across all test-takers. Previously, regulations regarding permitted calculators were less stringent, but evolved to prevent unfair advantages based on sophisticated calculator capabilities. Using an approved calculator streamlines problem-solving, allowing students to focus on mathematical concepts rather than complex calculations.