About CasCalc

CasCalc is a free online computer algebra system (CAS) and graphing calculator. It gives exact answers such as 2√2 or x = 2, x = 3, shows the decimal value next to them, and draws a graph of anything that depends on x. It runs entirely in your browser, with no sign-up.

Solving equations

Type an equation and press Enter. x^2 - 5x + 6 = 0 gives x = 2, x = 3, and the roots are marked on the graph. For a system, separate the equations with commas: x + y = 10, x - y = 4.

Simplify, expand and factor

Type an expression, then choose Simplify, Expand or Factor in the toolbar. For example, factoring x^2 - 9 gives (x - 3)(x + 3), and simplifying (x^3 - 1)/(x - 1) gives x^2 + x + 1.

Derivatives and integrals

Choose Derivative or Integral to differentiate or integrate with respect to x. For definite integrals write defint(x^2, 0, 1, x), and for limits write limit(sin(x)/x, x, 0).

Variables and functions

Store a value with a := 3 or define a function with f(x) := x*sin(x). Later lines can use them, and $3 reuses the result of line 3.

Graphing

CasCalc graphs functions (y = x^2 - 4), polar curves (r = 4cos(2θ)), parametric curves ((3cos(t), 2sin(t))), curves in x and y (x^2 + y^2 = 16) and shaded inequalities (y < x/2 - 5). Hover over or tap a curve to trace it. Zeros, maximums, minimums and intersections are marked so you can read them off exactly. The Table tab lists x and y values with any start and step you choose.

Step-by-step math guides

New to a topic? Read the math guides for worked explanations of quadratic equations, factoring, systems of equations, derivatives and integrals. Every example opens in the calculator with one click.

Can I use it on exams?

CasCalc is a study and homework tool. Standardized tests such as the SAT, ACT and AP exams set their own calculator rules, so check those before test day.

Privacy

Your worksheet is stored only in your own browser. See the privacy policy for details, including how advertising works on this site.