Desmos Calculator College Board Version Explained

The Desmos calculator College Board version is the official, pre-approved Desmos graphing calculator embedded directly into the SAT, PSAT, and AP exams. You do not download or install it; it appears on-screen within the testing application, and it is the only calculator allowed for the digital SAT math sections.

Formula

The formula used by the calculator above is for a rectangular volume: Volume (yd³) = Length (ft) × Width (ft) × Depth (in) ÷ 324. The 324 comes from converting feet and inches into cubic yards: 1 yard = 3 feet, so 1 cubic yard = 27 cubic feet, and 1 foot = 12 inches, so 1 cubic foot = 1728 cubic inches. Dividing by 324 (which is 27 × 12) converts a volume expressed in ft²·in directly to cubic yards.

For the second output, Volume (ft³) = Length (ft) × Width (ft) × Depth (in) ÷ 12, because each inch of depth is 1/12 of a foot.

Worked Example

Using the default values: Length = 40 ft, Width = 25 ft, Depth = 3 in.

1. Compute the volume in cubic feet: 40 × 25 × (3 ÷ 12) = 40 × 25 × 0.25 = 250 ft³.
2. Convert to cubic yards: 250 ÷ 27 = 9.259 yd³.
3. Using the direct formula: 40 × 25 × 3 ÷ 324 = 3000 ÷ 324 = 9.259 yd³.

The calculator shows 9.26 yd³ and 250 ft³, matching the step-by-step result.

What Is the College Board Version?

The College Board version of Desmos is a locked-down build of the standard Desmos graphing calculator. It includes the same core features: graphing functions, plotting points, sliders, tables, statistics, and regression. What it excludes are features that could give test-takers an unfair advantage, such as saving graphs to the cloud, accessing the public gallery, or using the 3D or geometry tools. The interface is simplified to show only what is needed for the exam.

This version is available on the digital SAT, PSAT/NMSQT, PSAT 8/9, and most AP math and science exams that allow calculators. The College Board and Desmos worked together to create a tool that is both powerful and secure, and it is the same for every student regardless of device (Windows, Mac, iPad, or Chromebook).

How to Access It

On the digital SAT, the calculator is built into the Bluebook testing application. You do not need to switch windows or open a separate app. During the math sections, a calculator icon appears in the top toolbar; clicking it opens the Desmos window, which you can move, resize, or close as needed. The same applies to AP exams that use the digital format.

If you want to practice with the exact same tool before test day, the College Board provides a free practice version on its website, and Desmos also hosts a dedicated Desmos for Testing page. The practice version behaves identically to the one in the exam, so you can build muscle memory without surprises.

Key Features You Can Use

• Graphing: Plot up to 10 functions at once, with adjustable colors and line styles.
• Sliders: Explore how changing a parameter (like slope or intercept) affects the graph.
• Tables: Enter data points and plot them, or generate a table from a function.
• Statistics: Compute mean, median, standard deviation, and even perform linear regressions.
• Scientific functions: Trigonometry, logarithms, exponentials, absolute value, and more.
• Inequalities: Shade regions that satisfy inequalities, which is often tested on the SAT.

You cannot use the Desmos calculator for the no-calculator portion of the SAT (though the digital SAT now allows it on both math sections, the no-calculator section was eliminated in 2024). For AP exams, check your specific subject’s calculator policy, as some allow a graphing calculator and others do not.

Differences from the Public Desmos

The most noticeable difference is the absence of the menu bar and the “+� button for adding folders, images, or notes. The College Board version also disables the ability to share graphs via a link, and it does not save your work after you close the exam. There is no undo button in the same location, and some keyboard shortcuts are disabled to prevent cheating.

Functionally, the math engine is identical. If you can solve a problem on the public Desmos, you can solve it on the test version. The only real difference is the user interface and the lack of cloud features.

Common Mistakes and Misconceptions

A frequent mistake is assuming the calculator can do everything for you. For example, the SAT often gives a word problem and asks for the number of solutions to a system of equations. You can graph both equations and count intersections, but if the lines are parallel or coincident, you need to interpret the graph correctly. The calculator shows no intersection for parallel lines, but it may be hard to tell if they are truly parallel or just nearly parallel—zoom in to check.

Another misconception is that the calculator is “smart� enough to solve equations like a CAS (Computer Algebra System). It is not. It will not give you an exact symbolic answer like x = √2; it gives a decimal approximation. For multiple-choice questions, this is usually fine, but for grid-in questions, you must round correctly.

Also, note that the calculator does not handle units. If you type 40 ft × 25 ft × 3 in, it will not convert units for you—you must do that manually, as shown in the worked example above.

How to Choose Between Desmos and a Handheld Calculator

On the digital SAT, you can bring your own approved handheld calculator, but the on-screen Desmos is always available. Many students find Desmos faster for graphing and regression, but a handheld is better for quick arithmetic if you are faster with physical buttons. There is no penalty for using Desmos, and it is the same for everyone, so there is no “unfair advantage� either way.

For AP exams, the policy varies: some allow both, some only allow a handheld, and some allow Desmos only if the exam is digital. Always check the College Board’s official calculator policy for your specific subject before test day.

Frequently Asked Questions

Is the Desmos College Board version free?

Yes, it is completely free. You do not need to purchase anything, and it is included in the testing app. The practice version is also free on the College Board and Desmos websites.

Can I use Desmos on the SAT if I bring my own calculator?

Yes, you can use both. The on-screen Desmos is always available, and you may also use an approved handheld calculator. Many students use the handheld for arithmetic and Desmos for graphing, depending on the problem.

Does the College Board version have all the functions of the regular Desmos?

It has all the essential graphing and statistical functions, but it lacks the 3D, geometry, and online sharing features. The math engine is identical, so any problem you can solve on the regular Desmos can be solved on the test version.

Can I save my Desmos graphs during the exam?

No, you cannot save or export graphs. The calculator is reset when you exit the exam, and there is no cloud storage. This is a security measure to prevent sharing answers.

What if I make a mistake in the Desmos calculator during the test?

You can clear the input line and start over. There is no undo button, but you can delete individual characters or use the “clear� option. If you close the calculator window, your work is lost, so be careful.

Is the Desmos calculator allowed on all AP exams?

No, it depends on the subject. For example, AP Calculus and AP Statistics allow graphing calculators, but AP Biology does not. Always check the official College Board calculator policy for your specific AP exam.

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in l | Lawn length | ft | 40 | 0 | 100000
in w | Lawn width | ft | 25 | 0 | 100000
in d | Depth | in | 3 | 0 | 120
out yd | Volume | yd³ | l * w * d / 324 | 2
out ft3 | Volume | ft³ | l * w * d / 12 | 1