Choosing the best calculator for SAT and ACT tests can feel overwhelming, especially when you’re already juggling so much to help your child succeed. You want to make sure they have every advantage possible, but with so many options and changing policies, it’s hard to know what’s truly necessary versus what’s just marketing.
The good news? The calculator your child chooses matters less than how well they know it. Whether you’re looking at a $17 scientific calculator or a $130 graphing model, the key is finding one that fits your budget and your child’s comfort level, then giving them plenty of practice time.
Here’s what you need to know about calculator policies, top recommendations, and strategies that actually help students feel confident on test day.
What Calculator Policies Changed in 2025?
The biggest change happened in August 2025: the College Board banned all CAS (Computer Algebra System) calculators from the SAT. This means popular models like the TI-89 Titanium and TI-Nspire CAS are no longer allowed, bringing SAT policy in line with the ACT’s longstanding rules.
If your child has been using one of these calculators in school, don’t panic. The digital SAT now includes a built-in Desmos graphing calculator, so students can actually take the test without bringing any calculator at all. However, many students still prefer bringing their own familiar device.
Both the SAT and ACT now prohibit calculators with CAS functionality, QWERTY keyboards, wireless or Bluetooth connectivity, and audio recording capability. Quick way to check: if “CAS” appears in the model name, it’s banned.
Which Calculator Should Your Child Actually Use?
The best calculator for your child isn’t necessarily the most expensive one. The best calculator is the one they’ll feel confident using under pressure. Here are the top choices by budget and needs:
Budget-Friendly Scientific Calculators ($10-$20)
Experts specifically recommend TI-30XS MultiView ($17) for its four-line display and ability to show equations as they appear in textbooks. It handles the vast majority of SAT and ACT calculations efficiently. The Casio fx-300ES Plus ($10-15) is also a great choice. It is incredibly affordable and covers all the essential functions students need.
Most SAT and ACT math can be done with basic scientific functions. These calculators are intuitive, have fewer buttons to confuse students, and won’t tempt them into over-relying on advanced features.
Mid-Range Graphing Calculator ($60)
Casio fx-9750GIII ($59-60) provides graphing capability at half the price of a TI-84. It includes a natural textbook display and sufficient memory for all standardized test applications. The tradeoff is a less intuitive interface than Texas Instruments models.
Premium Choice: TI-84 Plus CE ($118-130)
The TI-84 Plus CE remains the gold standard; the calculator most high school math teachers use and recommend. It is consistently called “the industry standard” for good reason. Features include high-resolution color display, the ability to show equations as they appear in textbooks, rechargeable battery lasting up to a month, extensive support resources and tutorials available, and approval for SAT, ACT, AP, PSAT, and IB exams.
When Should Your Child Use a Calculator vs. Mental Math?
Calculator over-reliance can become a problem, particularly if you’re not aware of where the boundaries lie. Both the College Board and ACT state that all math problems can be solved without a calculator. The key is knowing when to reach for it and when to trust mental math.
Mental math is faster for simple percentages like finding 15% of 80, basic operations like 24 ÷ 3, and order of operations problems that can be solved left-to-right. Students who practice these skills save valuable time on test day.
Calculators save time on complex multi-digit multiplication, multi-step fraction calculations, graphing to find intersections, and statistical analysis. The rule of thumb is that if it’s something you can’t easily do on a basic scientific calculator, it’s probably worth the graphing calculator’s time.
Note: It is often recommended to bring a backup calculator on test day, even if it is a simple $10 scientific model.
Should You Choose Graphing or Scientific?
For most students, the decision comes down to budget and familiarity rather than test performance. The $100+ price difference between a scientific and graphing calculator doesn’t translate to proportional score improvements for students who practice sufficiently with either device.
Graphing calculators excel at visualizing function behavior and finding intersection points without algebraic manipulation. Scientific calculators cost significantly less, have simpler interfaces, and remain fully approved for all standardized tests.
The digital SAT’s built-in Desmos essentially provides free graphing capability to all test-takers, reducing the advantage of bringing an expensive graphing calculator. For students taking both SAT and ACT, the TI-84 Plus CE represents the safest investment.
Ready to Give Your Child the Confidence They Need?
While having the right calculator helps, true test success comes from understanding the underlying math concepts and building genuine confidence. If your child is struggling with test prep or feeling anxious about standardized tests, personalized tutoring can make all the difference.
At Tutor Doctor, we build the skills and confidence they need to tackle any challenge. Our tutors work one-to-one with your child, matching their learning style and personality to create a supportive environment where they can truly thrive. Contact Tutor Doctor today to learn how personalized tutoring can transform their approach to learning and test-taking.
