Online graphing calculator (plot functions)
Type the function with x, like 2x + 1 or x^2 - 4. The graph appears right away; move your mouse or finger to read the points.
How to useType f(x), see the graph
Move the mouse over the graph to read the points.
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Online graphing calculator (plot functions): what it is for
Type up to four functions of x, with powers (^), implicit multiplication (2x) and functions such as square root, absolute value, sine, cosine, tangent, logarithm and exponential. Adjust the x range and, if you want, the y range.
Move your mouse or finger over the graph to read the points of each function, and download it as PNG or SVG.
How to use
- Type the function with x.
- Adjust the x and y ranges.
- Read the points and download the graph.
When to use it
- Studying linear and quadratic functions.
- Checking homework.
- Graphs for lessons and handouts.
Frequently asked questions
How do I type the function?
Use x as the variable, + - * / for arithmetic and ^ for powers: x^2 - 3x + 2. Multiplication can be implicit (2x, 3(x+1)). Functions: sqrt (square root), abs (absolute value), sin, cos, tan (in radians), ln (natural log), log (base 10) and exp; the constants pi and e work too.
How do I see where the function crosses the x axis?
Move the mouse (or your finger) close to the x axis: the point shows x and y. Where y is 0 is a root. To find it precisely, narrow the x range around that point.
Why does the graph disappear or have gaps?
Because the function does not exist there: the square root of a negative number, the log of zero or a negative number and division by zero have no real value, like 1/x at x = 0. The tangent also jumps. The graph simply does not draw those points.
Is it really free?
Yes, 100% free. No sign-up, no subscription and no usage limits. All Tools123 tools are free and run right in your browser.