ACT vs. SAT: which should my child take?

This is one of the first questions families ask, and it's worth answering quickly, because most families spend far too long on it.

The short answer: both tests are accepted everywhere, both measure similar skills, and neither is easier in the abstract. The right test for your child is the one they score better on. The only reliable way to find that out is to have them take a practice version of each.

What the tests cover

The SAT and ACT are more alike than different. Both test reading comprehension, grammar and writing, and math. Both are accepted by every four-year college in the United States. Neither penalizes wrong answers.

The meaningful differences come down to a few things.

Science. The ACT used to have a required Science section. As of September 2025, Science is optional and does not factor into the composite score. The composite is now the average of English, Math, and Reading. If a student does take the optional Science section, they receive a separate STEM score (average of Math and Science), but it doesn't affect the composite. Students applying to competitive engineering or pre-med programs may still want to take it, since some programs view a strong Science score as evidence of data literacy.

Time per question. The SAT gives significantly more time per question than the ACT. Students get about 70 seconds per Reading and Writing question and about 95 seconds per Math question on the SAT. The ACT moves considerably faster across all sections. Students who struggle with pacing tend to notice the difference.

Reading style. The SAT uses shorter passages and requires quick context switching between them. The ACT features longer passages that reward reading stamina. Students who prefer to settle into a passage may find the ACT more comfortable; students who are strong at extracting key information quickly may prefer the SAT.

Math content. SAT Math goes deeper on algebra and data analysis and includes some student-produced response (grid-in) questions. ACT Math is entirely multiple choice and covers a broader range of topics, including more trigonometry and geometry. A student who is strong in algebra but rusty on trig may find the SAT more comfortable.

Format. The SAT is digital and adaptive. Performance on the first module of each section determines whether the student gets a harder or easier second module, which affects the score ceiling. The ACT is available in both paper and digital formats (students choose during registration) and is linear in both cases, meaning every student gets the same questions regardless of performance.

Length. The SAT takes about 2 hours and 14 minutes. The enhanced ACT (without the optional Science section) takes about 2 hours and 5 minutes. With Science, the ACT is closer to 2 hours and 45 minutes.

How to decide

Take a practice test of each. This is the only approach that produces useful information. Assumptions based on a student's subject strengths or which test "feels right" are less reliable than spending a few hours taking a practice exam of each and comparing the results.

You can compare scores across the two tests using the official concordance table. For example, an SAT score of 1390 to 1410 corresponds to an ACT score of 31. If one score is clearly stronger after concordance, that's the test to focus on. See our full SAT-ACT conversion chart.

If the scores come back essentially equal, lean toward the SAT. It has more available prep material, its adaptive format is well-suited to AI-driven practice tools, and it's increasingly the default at selective schools.

The enhanced ACT

The ACT underwent significant changes starting in September 2025. The new version, called the enhanced ACT:

• Made Science optional, removing it from the composite score
• Reduced the number of questions across all sections
• Increased time per question slightly
• Cut the total test time to about 2 hours and 5 minutes (without Science)
• Introduced section retesting, allowing students to retake individual sections rather than the full exam

These changes make the ACT more flexible than it used to be. Section retesting in particular is a meaningful advantage for students who score well in some areas but need to improve one section. The SAT does not offer section retesting.

The question that matters more

Most of the ACT vs. SAT debate is a proxy for a different question: how much can my child improve, and on which test?

A student who scores a 1350 on a cold SAT diagnostic has a different set of considerations than one who scores a 1250. The gap between a baseline score and a realistic target, based on where errors are coming from, how much prep time is available, and how the student learns, matters more than which test they choose.

That's the conversation worth having early. The test choice follows from it.

Sharp is designed for every student, no matter their starting point.