Digital SAT Calculator Rules: What’s Allowed, What’s Banned, and the Best Strategy
Test Preparation
Sep 6, 2025
Understand the Digital SAT calculator rules, the best strategies for usage, and how to choose the right tool for test day success.
Here’s what you need to know about calculators for the Digital SAT:
You can use an approved calculator or the built-in Desmos graphing calculator in the Bluebook app.
Allowed calculators include scientific, basic four-function, and graphing calculators without CAS (e.g., TI-84 Plus CE, Casio fx-115ES Plus).
Banned calculators include models with CAS functionality (e.g., TI-89, TI-Nspire CAS).
The built-in Desmos calculator is available for all test-takers and supports graphing, scientific functions, and statistics.
Smart calculator use matters. Save time by using mental math for simple problems and calculators for complex ones.
Pro tip: Practice using both your physical calculator and the Desmos tool to ensure you're comfortable with both options on test day. Double-check your calculator against the latest College Board rules to avoid surprises.
Desmos Calculator Tips (ep 4): Digital SAT Strategy Guide
Official Digital SAT Calculator Rules
The College Board has clear guidelines on calculator usage for the Digital SAT. These rules specify which types of calculators are allowed and which are not, helping students prepare effectively for test day.
Allowed Calculator Types
You are permitted to use scientific calculators, basic four-function calculators, and graphing calculators without CAS (Computer Algebra System) functionality. Some commonly approved models include:
TI-84 Plus CE
Casio fx-115ES Plus
Each type has its strengths. Scientific calculators, like the Casio fx-115ES Plus, handle trigonometric functions, logarithms, and statistical calculations. Basic four-function calculators are limited to simple arithmetic tasks. Graphing calculators, such as the TI-84 Plus CE, can plot graphs, solve equations, and perform matrix operations, but they lack CAS capabilities, which makes them compliant with the rules.
Banned Calculator Types
Calculators with CAS functionality are not allowed. These devices can solve equations step-by-step and manipulate algebraic expressions symbolically, giving users an unfair advantage. Models that fall into this category include:
TI-89
TI-Nspire CAS
Casio ClassPad series
Be sure to double-check the College Board's calculator policy ahead of time to avoid any issues during the exam.
Built-in Desmos Calculator in Bluebook App
The Digital SAT also provides a built-in option: the Desmos calculator, which is integrated into the Bluebook testing application. This feature ensures that every student has access to a reliable computational tool during the test. The Desmos graphing calculator includes:
Scientific functions
Graph plotting
Statistical calculations
Regression analysis
While the Desmos calculator is comprehensive, it’s not a one-size-fits-all solution. Some problems might be solved more efficiently with a physical calculator or even without one. Still, it serves as a handy backup for students who prefer not to bring their own device or encounter unexpected issues with their calculator.
You are allowed to use an approved handheld calculator alongside the built-in Desmos calculator if you wish. Just keep in mind that the Desmos interface may differ from what you’re used to, so it’s worth practicing with it beforehand to avoid surprises during the test.
How to Use Your Calculator Effectively
Knowing which calculators are allowed is just the beginning. The real test lies in using your calculator wisely to save time and avoid costly mistakes. On the Digital SAT, you can use a calculator throughout the entire Math section. However, savvy test-takers understand that reaching for a calculator isn’t always the best choice.
When to Use Your Calculator
Your calculator is a lifesaver for more complicated calculations. Think of tasks like working with tricky decimals, square roots, or trigonometric functions - things that are tedious or prone to errors if done manually. It’s also helpful for multi-step problems, such as those involving statistics or data analysis. For example, when calculating standard deviation or solving layered equations, the built-in Desmos calculator can streamline the process.
But for simpler math, like adding 15 + 23 or multiplying 8 × 7, mental math is often faster and more efficient. Over-relying on your calculator for basic arithmetic can waste precious seconds and increase the risk of input errors. Similarly, with a little practice, basic fraction operations are often quicker to solve in your head.
When faced with word problems, take a moment to carefully read the question and identify the necessary calculations. Then decide whether grabbing your calculator will actually save time or just complicate things.
Don’t Rely Too Much on Your Calculator
Mental math is your ally for quick, straightforward operations. Many students fall into the trap of using their calculator for every single calculation, even the simplest ones. This habit can eat up valuable time and lead to unnecessary errors.
Strong mental math skills are essential for success on the Digital SAT. Quick estimates - like finding 10% of a number, recognizing perfect squares, or working with common fractions - can save time and double as a way to double-check your calculator’s results.
Avoid experimenting with unfamiliar functions on test day. If you’re not confident using a particular feature, stick to methods you know well, even if they’re a bit slower. It’s better to be accurate than to risk errors with untested shortcuts.
Finally, don’t overlook practical concerns like battery life. Make sure your handheld calculator is fully charged or bring a backup if possible. More importantly, be ready to switch to the built-in Desmos calculator if needed. Being comfortable with both tools will keep you prepared for any situation.
Practice with Both Calculator Options
Familiarity with both your handheld calculator and the built-in Desmos calculator is key to flexibility on test day. Each tool has its advantages.
Your handheld calculator likely feels intuitive and allows for quick input, thanks to its physical buttons. It’s great for rapid calculations when time is tight. On the other hand, the Desmos calculator shines when it comes to graphing or solving more advanced statistical problems. Its visual interface makes it easier to spot patterns and confirm your answers.
Best Calculator Models for the Digital SAT
Picking the right calculator can make a big difference on test day. A dependable device not only speeds up calculations but also provides a sense of familiarity and confidence many students rely on.
Top Calculator Models
The TI-84 Plus CE is a standout choice for the SAT. This graphing calculator easily handles everything from simple arithmetic to advanced statistical functions. Its color display, rechargeable battery, and user-friendly interface make graphing and data visualization quick and clear.
For those who prefer a scientific calculator, the Casio fx-115ES Plus is an excellent option. Its natural textbook display shows fractions and radicals just as they appear in textbooks, which helps minimize errors during calculations.
Another strong contender is the TI-36X Pro, which combines features of both scientific and graphing calculators. It supports matrix operations, calculus functions, and statistical calculations, all within a compact design. The multi-line display lets you see both your inputs and results at the same time, making it easier to spot mistakes.
Here’s a quick comparison of their features and price ranges:
Calculator Feature and Price Comparison
Calculator Model | Type | Display | Battery | Key Features | Price Range |
|---|---|---|---|---|---|
TI-84 Plus CE | Graphing | Color, backlit | Rechargeable lithium-ion | Programming, apps, USB connectivity | $120–$150 |
Casio fx-115ES Plus | Scientific | Natural textbook display | Dual power (solar + battery) | 280+ functions, equation solver | $15–$25 |
TI-36X Pro | Scientific | Multi-line | Battery (AAA × 1) | Matrix operations, calculus functions | $20–$30 |
The price range reflects the varying capabilities of these calculators. While the TI-84 Plus CE is more expensive, its advanced features and durability often make it worth the investment, especially for students planning to tackle higher-level math in college.
Check for Calculator Rule Updates
Once you’ve chosen a calculator, make sure it complies with the latest SAT policies. The College Board regularly updates its list of approved calculators, which you can find on their website at collegeboard.org. It’s a good idea to check this list at least two weeks before your test date to confirm your model is still allowed.
Be mindful of any firmware or software requirements for your calculator. Some models need specific operating system versions to remain compliant, and certain features - especially on programmable calculators - might need to be disabled before the exam. Understanding these details can save you from unnecessary stress on test day.
To stay informed, consider signing up for College Board updates. This way, you’ll be notified of any policy changes in advance, giving you time to adjust your preparation if needed. A little preparation now can go a long way toward ensuring a smooth test experience.
Conclusion: Get Ready for Digital SAT Success
Your choice of calculator and how you use it can play a big role in your performance on the Digital SAT. By now, you’ve got a clear understanding of the rules - what’s allowed, what’s not, and how the built-in Desmos calculator in the Bluebook app can be a helpful tool during the test.
But remember, success isn’t just about having the right calculator. It’s about using it wisely. Not every question calls for a calculator, and in some cases, relying on mental math or quick calculations might save you valuable time. Stick with a device you know well, one that’s permitted and fits your comfort level, so you can focus on solving problems with confidence.
FAQs
What type of calculator can I use on the Digital SAT, and how do I make sure it’s allowed?
If you're planning to use a calculator on the Digital SAT, make sure it aligns with the College Board’s rules. Only models without CAS (Computer Algebra System) functionality are allowed. Starting in August 2025, calculators with built-in or programmable CAS features will no longer be permitted.
Before test day, confirm your calculator is on the approved list and ensure it's functioning properly. This way, you'll be ready to handle math problems without any hiccups.
What are the benefits of using the built-in Desmos calculator instead of a physical calculator on the Digital SAT?
The Desmos calculator built into the Digital SAT brings some clear advantages over using a physical calculator. Since it’s integrated directly into the test interface, you can pull it up instantly without wasting time switching between tools. This seamless access can be a real time-saver during the exam. Plus, it’s equipped to handle advanced calculations like exponential, logarithmic, and trigonometric equations, giving you the ability to tackle complex problems more effectively.
What really sets Desmos apart is its visualization capabilities. You can graph equations to see how variables interact, which can deepen your understanding and help you solve problems more accurately. With regular practice, you’ll likely find that Desmos helps you work more efficiently, make fewer mistakes, and potentially boost your math score. Getting comfortable with it before test day is a smart move to ensure you’re making the most of this resource.
What’s the best way to balance mental math and calculator use on the Digital SAT?
To excel on the Digital SAT, it's smart to strike a balance between mental math and calculator use. Use mental math for quick, simple calculations like basic addition, subtraction, or estimating values. This saves valuable time. For more complicated problems, turn to your calculator, but don’t waste time using it for tasks you can easily handle in your head.
Preparation matters. Get comfortable with your calculator’s functions and shortcuts well before test day. Practice under timed conditions to build confidence and speed. By pairing mental math for quick solutions with your calculator for precision, you’ll work more efficiently and minimize mistakes during the test.