Function Grapher — Plot y = f(x) Online (Free)
Use this free function grapher to plot y = f(x) right in your browser. Type a function such as x^2-3 or sin(x), optionally add a second function and set the x-range, and the tool draws a clean, auto-scaled graph — no software to install.
How to use the function grapher
- Type a function of x (you can use +, −, *, /, ^, parentheses, and functions like sin, cos, sqrt, ln, log).
- Optionally add a second function and choose the x-range.
- Press Calculate to see the curve, a table of sample values, and the plot.
Reading the graph
The grapher samples the function across your x-range, auto-scales the y-axis to fit, and draws the curve over a labeled grid. Points where the function is undefined are simply skipped, so you always get a clean plot.
Frequently asked questions
What functions can I graph?
Any expression in x using +, −, *, /, ^, parentheses, and sin, cos, tan, sqrt, ln, log, abs and exp, plus the constants pi and e.
Can I plot two functions at once?
Yes — enter a second function g(x) and both curves are drawn together in different colors so you can compare them.
How is the y-axis scaled?
Automatically: the grapher samples your function over the x-range and fits the y-axis to the values it finds.
Read the full lesson: learn the method step by step.
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