Free Online Graphing Calculator

Q: What can I graph?

Functions y = f(x), inequalities such as y > x^2, vertical lines x = a, polar curves r = f(θ), and points like (2, 3). You can plot up to 8 entries at once.

Plot y = f(x), inequalities, vertical lines, polar curves and points. Drag to pan, scroll or pinch to zoom. Use a, b and c as adjustable parameters. Analysis finds roots, intercepts, turning points and intersections.

y = { x}^{2}-2~ x-3

y = 2~ x+1

Up to 8 rows. Each row can be a function (x^2 - 1), an inequality (y >= 2x + 1, x < 3), a vertical line (x = 2), a polar curve (r = 1 + cos(theta)), or points ((1, 2), (3, -1)). Use parameters a, b, c with the sliders. Drag to pan, scroll or pinch to zoom. Keyboard: arrows pan, + / − zoom, 0 resets.

Parameters

abc

Examples

Analysis

Analyze entry

Visible window: x from -10 to 10. Values are computed numerically from your function and rounded to 6 significant figures.

Roots (x-intercepts): x = -1, x = 3
y-intercept: (0, -3)
Turning points: (1, -4) local minimum
Intersections with entry 2: (-0.828427, -0.656854), (4.82843, 10.6569)

Show derivative

Shade integral

Graphing Calculator · Calculators

Frequently asked questions

What can I graph?

Functions y = f(x), inequalities such as y > x^2, vertical lines x = a, polar curves r = f(θ), and points like (2, 3). You can plot up to 8 entries at once.

How do parameters a, b and c work?

Type expressions that use a, b or c (for example y = a*x^2 + b*x + c) and move the sliders. The graph updates immediately.

Does the analysis find exact roots?

Roots, intercepts, turning points and intersections are computed numerically in the visible window and rounded to 6 significant figures. Zoom in for finer detail.

Can I share a graph?

Yes. Use Copy share link to put the functions, view and parameters into the URL hash. Anyone opening the link sees the same graph.