SAT vs. ACT: Which to Take, and When

Both major U.S. college admissions tests went through real changes in the last two years, not just small tweaks, so advice from even a few years ago is partly out of date. The SAT moved fully to a digital, adaptive format in 2024. The ACT introduced an "Enhanced" version in 2025 that made its science section optional and shortened the overall test. This guide covers what's actually different between the two today, and a reasonable way to think about which one to take and when.

Which test, in brief

Neither test is more prestigious or more widely accepted than the other, every school that considers test scores accepts both equally. The real differences are about format and pacing: the digital SAT is adaptive (the second module of each section adjusts in difficulty based on how you did on the first) and gives you more time per question. The Enhanced ACT is a fixed-form test (every question is set in advance, not adjusted to you), moves faster, and lets you choose whether to include a Science section at all. Which one suits you better usually comes down to whether you do better with more time to think per question or with a faster pace and more total questions, and that's worth testing directly rather than guessing.

What changed, specifically

• The SAT is now fully digital and adaptive. Since 2024, the SAT is taken on a computer (or school-provided device), runs shorter than the old paper version, and uses an adaptive format: your performance on the first part of a section determines whether the second part is more or less difficult, which in turn affects scoring. A calculator is allowed throughout the entire math section now, a change from the old paper SAT's no-calculator portion.
• The ACT introduced an "Enhanced" format with optional Science. As of the 2025-2026 testing year, the ACT composite score is calculated from English, Math, and Reading only. Science is now a separate, optional section: take it if you want, and it's reported as its own score rather than folded into your composite. Students can choose from four configurations (Core only, Core plus Science, Core plus the optional Writing essay, or all four sections), and the ACT is now available in both digital and paper formats, identical content either way.
• Both tests now commonly superscore. Superscoring means a college combines your best section scores across multiple test dates into one composite, rather than only looking at your single best full sitting. Most colleges that consider test scores now superscore both the SAT and the ACT, which changes the retake calculus: a strong Math score from one sitting and a strong Reading/Verbal score from another can combine into a better composite than either sitting alone produced. Always confirm a specific school's superscoring policy directly, since it isn't universal.

Content differences that actually affect which test fits you

• Pacing. The ACT is the faster-paced of the two, more questions in less time per question, which rewards students who read and solve quickly and confidently. The digital SAT gives more time per question and leans more on reasoning through fewer, often more layered questions.
• Math scope. The ACT's math section covers a slightly broader range of topics, including some trigonometry, and allows a calculator throughout. The digital SAT's math section is somewhat more reasoning-and-algebra focused and also allows a calculator throughout.
• Reading passages. The digital SAT uses short, single-paragraph passages with one question each. The ACT uses longer, traditional passages with multiple questions attached to each one, closer to the reading format most students are already used to from school.
• Science, if you want it. Only the ACT offers a dedicated Science section, and it's optional. It's less about scientific knowledge and more about reading graphs, tables, and experimental data quickly and accurately. If that kind of data-interpretation work is a genuine strength, including it can round out your profile a little, but skipping it has no real downside since it's reported separately from your composite either way.

A reasonable timeline

1. Fall of junior year: take a full-length practice test of each, under real timing, and compare how each one actually felt, not just the practice scores. Free official practice tests are available directly from the College Board and ACT, and this is a more reliable signal than general advice about which test is "easier."
2. Winter/spring of junior year: take your first official sitting of whichever test fit better (or both, if you're unsure after practice tests, though most students settle on one).
3. Summer before senior year: review your results and decide whether a retake is worth it. Because of superscoring, a retake focused specifically on your weaker section can meaningfully help, rather than needing to improve everything at once.
4. Early fall of senior year: a final sitting, if needed, timed to arrive before your earliest application deadlines (Early Decision/Early Action deadlines are typically in early-to-mid November, see our guide to ED vs. EA vs. Regular Decision for how those timelines work).

Don't lose sight of whether you need either one at all

A large share of four-year colleges remain test-optional, and some are test-blind entirely, though a handful of highly selective schools have reinstated testing requirements in the past couple of admissions cycles. Policies vary school by school and change year to year, so check each school on your list directly rather than assuming. Our guide to test-optional, test-blind, and test-required policies walks through exactly what each policy actually means for your application.

SAT is a trademark of the College Board. ACT is a trademark of ACT, Inc. MajorAtlas isn't affiliated with or endorsed by either organization, and current test format and policy details should always be confirmed directly from each organization's official site.