Every SAT Math Formula You Need to Memorize
The complete list of Digital SAT math formulas to memorize — including what the reference sheet already covers and what it doesn't.
What's on the Reference Sheet
The Digital SAT gives you a reference sheet inside Bluebook with basic area, volume, and circle formulas. You don't need to memorize those — but you should know them well enough that you don't need to look them up under time pressure.
- Area of a rectangle, triangle, circle
- Volume of a cube, rectangular prism, cylinder, sphere, cone, pyramid
- Pythagorean theorem
- 30-60-90 and 45-45-90 triangle side ratios
- Circumference and arc/sector formulas in radians
What to Memorize (Not on the Sheet)
A set of formulas you must memorize because they aren't on the reference sheet but appear repeatedly.
- Slope = (y₂ − y₁) / (x₂ − x₁)
- Distance = √((x₂ − x₁)² + (y₂ − y₁)²)
- Midpoint = ((x₁ + x₂)/2, (y₁ + y₂)/2)
- Quadratic formula
- Vertex form of a parabola: y = a(x − h)² + k
- Exponential growth/decay: y = a(1 + r)^t
- Simple interest and compound interest
- SOH-CAH-TOA for right-triangle trig
Related Posts
- How to Get a 1600 on the Digital SAT
A realistic plan for scoring a perfect 1600 on the Digital SAT, based on what 1600-scorers actually do differently from 1500 scorers.
- How to Use Desmos on the Digital SAT
A tactical guide to using the built-in Desmos graphing calculator on the Digital SAT Math section — the shortcuts that save the most time.
Practice on 1600.now
Apply what you just read. Run the numbers in the SAT score calculator, take a full Digital SAT module, or drill targeted skills in the question bank.
Post 45 of 52 in the 1600.now Digital SAT blog.