Try: sin(x), x^2-2, 3x+1, 1/x, 2pi, ln(x), abs(x)
How it works
Type any expression in x. The parser reads it left to right, then the plotter samples it across your x-range and draws the curve. Undefined points (like 1/x at zero) are skipped rather than drawn as false lines.
Supported: + - * / ^, parentheses, implicit multiplication (2x, 3sin(x)), sin cos tan, asin acos atan, sqrt, abs, exp, ln, log, floor, ceil, round, and the constants pi and e.
Functions you can plot
A linear function such as 2x + 1 draws a straight line with a slope of two. A quadratic such as x^2 - 2 draws a parabola, opening upward when the x squared term is positive. A cubic or higher power bends more sharply and can cross the axis several times.
Trigonometric functions such as sin(x) and cos(x) repeat in waves between minus one and one. Because the working angle unit is radians, a full wave spans about 6.28 on the x axis, which is two pi. Exponential functions such as exp(x) grow quickly, while logarithms such as ln(x) grow slowly and are only defined for positive x.
Rational functions such as 1/x show a break at zero, where the value is undefined. The plotter leaves that gap empty instead of connecting the two branches with a false line, so the shape you see is the shape the function really has.
Tips for reading a graph
Where the curve crosses the horizontal axis, the function equals zero, which is useful for spotting roots. Where it crosses the vertical axis, x is zero, so you are reading the constant term. The steepness of the curve at a point is its slope, and a curve that flattens out is approaching a maximum, minimum or plateau.
Frequently asked questions
Is the grapher free? Yes, it is completely free and needs no sign-up. Everything runs in your browser, and nothing you type is sent anywhere.
Why is my curve missing? If the expression cannot be parsed, the error box explains why. Check for a missing parenthesis or an unsupported symbol.
How many points does it plot? It samples hundreds of points across your x-range and connects them, which is smooth enough for everyday work while staying fast.