Graph Plotter

Plot up to four functions of x, zoom and pan, and read exact values along each curve.

Runs entirely in your browser. Nothing you type or paste is sent anywhere.

Functions of x

f₁(x) =
f₂(x) =
f₃(x) =

Graph

Hover over the graph, tap it, or focus it and use the arrow keys to read values.

x from

x to

y from

y to

Drag to move around; scroll or pinch to zoom. With the graph focused, ← and → trace along x, Shift+← → and ↑ ↓ move the view, + and − zoom, 0 resets.

Where the curves cross the axes

f₁(x) = x^2 - 2
x-intercepts in view (y = 0)
y-intercept (x = 0)
y = −2
f₂(x) = 2sin(x)
x-intercepts in view (y = 0)
y-intercept (x = 0)
y = 0
f₃(x) = x/2 + 1
x-intercepts in view (y = 0)
y-intercept (x = 0)
y = 1

How it’s calculated: each curve is sampled about once per pixel, with extra samples where it’s steep. It breaks where the function is undefined or jumps, like tan(x) at π/2. An x-intercept is where the sign changes, narrowed down by repeated halving (bisection).

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