The SAT's built-in graphing calculator

• A calculator may be used in the Math section, not in Reading and Writing. Calculators are not required.
• Bluebook, the testing app, has a Desmos calculator built in, with a graphing and a scientific option; you can switch between them at any point in the Math section.
• You may bring your own approved handheld calculator instead (no computer algebra system, CAS).
• The College Board suggests practicing with the calculator you will use on test day, for example by taking a practice test in the Bluebook app.

1. Solve by graphing. Type each side of an equation as its own line (y = 3x − 7 and y = 11 − 2x). Tap where they cross: the x-value is the solution.
2. Systems of equations. Type both equations as given; the crossing point is the solution. Parallel lines mean no solution; one line on top of the other means infinitely many.
3. Zeros and vertex. Graph the quadratic and tap it: Desmos marks the x-intercepts and the vertex, with their coordinates.
4. Sliders for unknown constants. Type y = ax^2 + 4x + c and Desmos offers sliders for a and c, so you can see how each one moves the graph.
5. Check an answer choice. Graph the original expression and a choice; if the graphs sit exactly on top of each other, the expressions are equivalent.
6. Statistics. A list such as [4, 8, 15, 16, 23] works with mean(), median() and stdev().

• Reading the question carefully: the calculator answers what you type, not what was asked.
• Questions about what a number means in context (what the slope means, what the y-intercept represents).
• Very simple arithmetic: typing can be slower than thinking.

Owl's SAT player has its own graphing calculator on every math question, written for this site: it graphs up to four expressions, works out plain numbers, marks where two graphs cross and reads any point you tap. It does not have sliders, tables, lists or regression, so practice those in Desmos itself or in Bluebook before test day.

Read on October 29, 2026. Products change; if something here is out of date, write to hello@owltestprep.com and we will fix it.

• College Board: SAT calculator policy
• College Board: full-length practice tests in Bluebook