On the digital ACT you can use an approved handheld calculator and the on-screen Desmos graphing calculator in the same Math section. What is allowed is in the calculator policy.
Pick the faster tool
Arithmetic, fractions, and stored values are often faster on the handheld. Graphs, tables, and messy algebra are often faster in Desmos, in Desmos on the ACT. Type the given equation as written, in type it as written.
Set degree or radian mode once, in the settings wrench.
The bottom line
Two calculators are allowed. Use the one that finishes the item sooner.
Start practicing
Start with a free diagnostic, then drill your weak spots with 15-question quizzes and track how you're doing across Reading, English, and Math. Compare plans whenever you're ready to go further.
This article offers general ACT prep guidance. The ACT can change from year to year, including its format, scoring, policies, test dates, and fees, so always confirm the latest details on the official ACT website at act.org before you make decisions. ACT® is a registered trademark of ACT, Inc. thirty-six is not affiliated with, endorsed by, or sponsored by ACT.