SAT Calculator Policy 2026: Bluebook, Desmos, and Prohibited Features

For the 2026 SAT, you may use the Desmos scientific or graphing calculator embedded in Bluebook throughout Math, or bring a permitted handheld calculator. The crucial current restriction is that handheld calculators with computer algebra system (CAS) functionality are not allowed. Do not use a phone, separate tablet, browser-based calculator, smartwatch, or external app as a calculator.

College Board's live SAT Calculator Policy controls test day. Check it again for your administration because College Board says calculator guidelines can be updated as often as annually.

The August 2025 CAS change that matters in 2026

Beginning with the August 2025 SAT Weekend administration and the October 2025 in-school SAT/PSAT testing window, College Board no longer permits calculators with CAS functionality on SAT Suite tests. That rule remains the key 2026 difference from older calculator lists and prep articles.

A calculator likely has CAS functionality if it:

• includes “CAS” in the model name; or
• can manipulate algebraic expressions symbolically, such as factoring or expanding them rather than only evaluating a numerical input.

Do not assume that a calculator once accepted for an older SAT is still acceptable. AP calculator policy is also separate: a model permitted on a particular AP Exam is not automatically permitted on the SAT.

Bluebook Desmos is allowed—external Desmos is not the testing tool

Bluebook provides both scientific and graphing Desmos options. College Board's Bluebook testing-tools page explains that the calculator can be moved on screen; Bluebook also includes the timer, reference sheet, annotation tools, option eliminator, and question menu.

The permitted calculator is the one built into the secure test app. Opening desmos.com in a browser, switching to another application, or using Desmos on a phone would leave Bluebook and violate testing rules. Practice inside Bluebook so the approved interface—not a full browser session—is familiar.

Useful embedded Desmos moves include:

SAT Math task	Desmos move	Required human check
Solve a system	Graph both equations and locate the intersection	Report the requested x- or y-coordinate
Find quadratic zeros	Graph the function or enter both sides	Confirm domain and which zero the question asks for
Explore a model	Use a table or regression when appropriate	Interpret coefficients with units
Check an equation	Substitute the proposed solution	Make sure it satisfies every condition

Desmos is not a CAS loophole. It is an approved embedded tool with the functions College Board makes available in Bluebook.

Handheld calculator features that create problems

The official policy should be checked by model and feature, but the prohibited categories include calculators that:

• have CAS functionality;
• use a computer-style QWERTY keypad;
• accept pen input or use a stylus;
• require an electrical outlet rather than operating as a handheld battery-powered device;
• make noise, use paper tape, or otherwise disrupt testing;
• are built into or run on a phone, smartwatch, tablet, laptop, or another communication device.

Students may not share calculators. Testing rules also prohibit using a calculator to communicate, copy questions, or retain test content. If you bring a programmable non-CAS model, follow the staff directions and current rules about clearing stored formulas before testing.

What “prohibited features” does not mean

Several common assumptions are wrong:

1. “All graphing calculators are banned.” False. Non-CAS scientific and graphing calculators can be allowed; check the current policy.
2. “If my handheld is prohibited, I cannot take Math.” False. Bluebook includes approved Desmos tools.
3. “CAS is fine because an old web page listed my model.” False for current SAT Suite testing. The CAS restriction took effect in 2025.
4. “AP and SAT use the same calculator list.” False. College Board explicitly maintains separate policies.
5. “I can use a second device only for Desmos.” False. The built-in Bluebook calculator is the approved digital option.

A 48-hour calculator audit

Two days before

• Find the full model name on the calculator body or settings screen.
• Search the live College Board policy for the model and prohibited features.
• Confirm that “CAS” is not in the model name and that it cannot symbolically manipulate expressions.
• Replace or charge batteries; bring backup batteries if the model allows them.
• Remove prohibited accessories and disable sounds.

The day before

• Complete Bluebook exam setup on the actual testing device.
• Open the Bluebook practice environment and locate scientific and graphing Desmos.
• Solve one system, one quadratic, and one table/model problem using the interface.
• Pack the handheld only if it clearly satisfies the current rule.

At the test center

• Follow the proctor's storage and calculator instructions.
• Never access a phone, watch, or other electronic device, including during breaks.
• If staff question a calculator, use embedded Desmos rather than arguing during the administration.

Choose tools by math, not by habit

A calculator can slow down a two-step arithmetic problem. Estimate first, then decide whether graphing, a table, or algebra is shorter. If Desmos returns an intersection (3, 11) and the prompt asks for the y-coordinate, the answer is 11; copying the first visible number is a reading error, not a calculator failure.

Review Makon's broader SAT calculator policy guide, practice legitimate shortcuts with SAT Desmos tricks, and learn what the built-in reference sheet does not cover in SAT math formulas. The safest 2026 setup is simple: Bluebook ready, embedded Desmos rehearsed, and any handheld verified as non-CAS on the current official page.