SAT or ACT? The 90-minute way to decide

Your sophomore needs to pick a test by the end of the year, and every comparison you’ve read ends with “it depends on the student.” The way to decide between the SAT and the ACT is a 90-minute session at your kitchen table: two shortened official sections of each test under the real per-question clock, scored and put on one scale with the published concordance, with a short time-pressure profile to break a tie.

This is a protocol rather than a list of pros and cons, because pros and cons describe tests, and you’re trying to describe a student. Run it once, on a Saturday morning, and you’ll have your answer by lunch.

Why the usual advice doesn’t help

The standard comparison says the ACT is faster and more straightforward and the SAT is slower and trickier, with a Science section on one side and an adaptive format on the other. All of that is true. None of it tells you which test your student will score higher on, because the student is the variable and the descriptions are of the tests.

The other common approach is to take both official tests and compare. That works, at the cost of two Saturdays, two fees and the month of waiting in between. It also compares a cold sitting of one against a cold sitting of the other, which is a noisy measurement of exactly the thing you care about.

The protocol below gets the same comparison in one morning using official practice material from both test makers, which is free. It is not a substitute for a full-length test of the chosen exam later. It is how you choose which full-length test to take.

What you’ll need

Two official sources and a timer. For the SAT, the Bluebook app from College Board, which has full-length official practice tests; the test structure is published at satsuite.collegeboard.org. For the ACT, the free official practice test PDF from act.org. Print the ACT sections; the SAT sections stay on screen, because that’s how the real test is delivered. Match the real formats.

The two tests give the student different amounts of time per question, and that gap is a large part of what you’re measuring. The figures below come from each test maker’s published structure.

The SAT is also adaptive by module: the second module in each section is harder or easier depending on how the student did on the first. The ACT is not adaptive and comes on paper or online. For the protocol you’ll use first-module SAT questions only, so adaptivity doesn’t enter the measurement.

The 90-minute protocol

Run it at 9 a.m. on a Saturday, phone out of the room, with a parent or sibling keeping the clock. Four blocks, two per test, alternating so fatigue falls evenly. Keep the per-question pace exactly as published, because pace is half of what you’re measuring.

Block 1: SAT Reading and Writing, 14 questions in 16 minutes

Open Bluebook Practice Test 1, Reading and Writing module 1, and have the student answer the odd-numbered questions only (1, 3, 5, through 27). Odd-numbered questions keep the module’s spread of question types and difficulty, since College Board orders each module by type and then easy to hard. Sixteen minutes, then pencils down regardless.

Block 2: ACT English, 25 questions in 17 minutes

The first 25 questions of the printed ACT English section, which is the first two passages. Seventeen minutes, then stop. Note how many questions were left blank, then take five minutes with no phones before Block 3.

Block 3: SAT Math, 11 questions in 17 minutes

Bluebook Practice Test 1, Math module 1, odd-numbered questions (1, 3, through 21). The built-in Desmos calculator is allowed, as on the real test. Seventeen minutes.

Block 4: ACT Reading, 18 questions in 20 minutes

The first two passages of the printed ACT Reading section, 18 questions. Twenty minutes. Again, count the blanks.

Total testing time is 70 minutes. The remaining 20 go to scoring and the profile below.

Scoring: put both on one scale

Score each block as a percentage correct, counting blanks as wrong. You now have four numbers. Average the two SAT blocks and the two ACT blocks separately, so you have one SAT percentage and one ACT percentage.

Percentages aren’t scores, and raw-to-scaled conversion differs by test and by form, so don’t try to turn 72% into a 1300. Instead, compare the percentages against each other, then use the concordance below as the lens for how large a gap actually matters.

ACT and College Board jointly publish a concordance table that maps scores between the tests. The table was built on the paper SAT, and College Board states the digital SAT reports on the same scale, so the mapping still applies; confirm the current table on either organization’s site. A few anchor points, all [verify] against the published table:

Notice how coarse the ACT scale is. One ACT point spans roughly 30 to 40 SAT points, so a difference of 2 ACT points or about 60 SAT points is the smallest gap worth calling real. In percentage terms on the shortened blocks, a gap under about 8 to 10 points is a tie. Above that, the higher test wins and you can stop reading.

The time-pressure profile

Most families get a tie. That’s expected, because a sophomore’s reading and algebra are the same on both tests, and the tests differ mostly in how they package time and difficulty. The tie-breaker is how the student experienced the clock, and you collect it in five minutes right after Block 4, while the feeling is fresh. Ask these and write the answers down.

• How many questions were blank at the end of each ACT block? Zero blanks at 42 seconds a question is a strong ACT signal. Four or more blanks on 25 English questions is a strong SAT signal.
• On the SAT blocks, were there questions the student understood but found slow, dense or “tricky”? Count them. Students who dislike the SAT usually dislike it for this reason, not for pace.
• In which blocks did the student look at the clock? Once or twice is normal. Constantly is a profile.
• Which test’s Reading felt more natural: the SAT’s one-question passages or the ACT’s long passages with ten questions each?
• Did the Desmos calculator help or distract?

A student who left nothing blank, finished early and found the SAT’s questions irritatingly indirect is an ACT student. A student who ran out of time on both ACT blocks, didn’t mind the SAT’s density and liked having 95 seconds for a Math question is an SAT student. A student with no clear profile either way should take the SAT, for the plain reason that the free practice material is deeper, the adaptive format rewards accuracy, and the two-hour-fourteen-minute test is shorter than the ACT with Science.

What to do with the answer

Pick one test and stop looking at the other. Choose one and commit. Preparing for both is the most common mistake we see in families who did the research carefully: the hours split, the strategies conflict (the ACT rewards speed; the SAT rewards first-module accuracy), and both scores land below where either would have alone.

Then build the calendar backward from a test date. For a student choosing the SAT in spring of sophomore year, the natural plan is a fall or spring test in junior year with 14 weeks of preparation in front of it; our backward-planned calendar lays out the dates. The ACT runs its own calendar on act.org, and the same backward planning applies.

For Texas families the choice carries no admissions penalty either way. UT Austin requires a test score from every applicant again and accepts either test; Texas A&M is test optional for fall 2027 entry and has said it intends to require scores again for 2028 entry if its regents approve [verify], and it too takes both. Rice and the other private schools in the state accept both as well. Score tiers for merit aid at schools such as Texas Tech are published with an SAT band and an equivalent ACT band side by side, so no money is left on the table by the choice itself.

One more thing the protocol gives you, which the decision itself obscures. The four blocks are a diagnostic. Whichever test the student picks, the blocks already show where the misses are, and a tutor can read them. The free first hour at Giant Prep can include a short diagnostic set of each test with Rick reading the results with you, which is the same protocol with a 99th-percentile scorer doing the profile.

Rick’s note: I run a version of this in the first hour when a family comes in undecided, and I’d say the ACT-versus-SAT part takes fifteen minutes. The rest of the hour goes to what the blocks revealed about the student, which is the part that moves the score.

What to do this week

1. Download Bluebook and print the official ACT practice test. Set the protocol for Saturday at 9 a.m.
2. Run the four blocks exactly as timed: 16, 17, 17 and 20 minutes, with a five-minute break after Block 2.
3. Score each block as a percentage, average by test, and compare. A gap under 8 to 10 points is a tie.
4. Collect the time-pressure profile the same morning, in writing, while the student remembers how each block felt.
5. Pick one test. Write it down. Build the prep calendar backward from a junior-year date. If you’d like Rick to read the four blocks with you, bring them to a free first hour.