Drag to move. Scroll or pinch to zoom. Move the mouse or tap on a graph to read its x and y.
About the graphing calculator
This is a free online graphing calculator. Type a formula such as x^2 - 4 and see its graph at once. You can plot up to six functions together, each in its own colour, and look at where they cross.
Drag the graph to move it. Scroll the mouse wheel or pinch with two fingers to zoom. Point at a curve, or tap it on a phone, to read the exact x and y. Under the graph, a table lists the zeros, the y-intercept, the highest and lowest points, and the places where two graphs meet.
There is nothing to install and no sign-up. Your formulas stay on your device.
Features
- Six graphs at once — each row has a colour dot to show or hide it, and a button to remove it
- Your own formula reader — type x^2, 2x, 3(x+1), sin(x), sqrt(x) and more, no special syntax
- Drag and zoom — mouse, wheel, pinch, or the zoom buttons; "Reset view" brings the start window back
- Point reader — move the mouse or tap to see (x, y) on the nearest curve
- Special points table — zeros, y-intercept, local minimum and maximum, and crossings with other graphs, to 4 decimals
- Safe lines — tan x and 1/x are cut at the gap, with no false line across it
- Vertical lines — type x = 3 to draw a vertical line
- Radians or degrees — one switch for all trigonometry
- Save as PNG — one click saves the graph as a picture
How to use it
- Type a formula in the first row, for example x^2 - 4. You can write y = x^2 - 4 too
- Press "Add a graph" to plot another one, or try an example chip
- Use the buttons for x, ^, square root, pi and absolute value if you are on a phone
- Drag the graph, and scroll or pinch to zoom
- Move the mouse over a curve, or tap it, to read x and y
- Select a row to see its special points in the table below the graph
- Press "Save as picture (PNG)" to keep the graph
What you can type
| You type | It means |
|---|---|
x^2, 2^x | powers; 2^3^2 is 2^(3^2) = 512 |
2x, 3(x+1) | multiplication without a sign |
-x^2 | minus of x squared |
sqrt(x), cbrt(x), abs(x) | square root, cube root, absolute value |
ln(x), log(x), log2(x), exp(x) | natural log, log base 10, log base 2, e to the power x |
sin, cos, tan, asin, acos, atan | angles in radians or degrees |
sinh, cosh, tanh | hyperbolic functions |
floor, ceil, round, sign | rounding and sign |
min(a, b), max(a, b) | smaller or larger value |
pi, e | the constants 3.14159... and 2.71828... |
x = 3 | a vertical line |
How to graph y = x^2
Type x^2 in the first row. A parabola opens up with its lowest point at (0, 0). The table shows a zero at 0 and a local minimum at 0. To move the parabola, try (x-2)^2 + 1. To make it narrower, try 3x^2.
Find the intersection of two graphs
Type two formulas, for example x^2 in f1 and x + 2 in f2. Select f1 by clicking its row. The table lists "Crosses f2" with the two x values, -1 and 2, and the y value at each point. Select another row to see the crossings from that side.
Only points inside the window are listed. Zoom out to find more.
Frequently asked questions
Is this graphing calculator free?
Yes. It is free and needs no account. It runs in your browser.
Can I use it instead of Desmos or GeoGebra?
It is a simple, quick option for plotting functions of x, finding zeros and crossings, and saving a picture. It does not do 3D graphs, sliders, tables of data or regressions. Those names belong to their owners and we are not connected with them.
Why is there a gap in the graph of tan x or 1/x?
These graphs have places where the value goes to infinity. The line should not join the two sides, so the calculator lifts the pen there. This is correct, not an error.
Can I graph a circle?
A circle is not a function of x, so write the top half and the bottom half as two graphs: sqrt(4 - x^2) and -sqrt(4 - x^2). The "Circle" example does this for you.
Does it work in degrees?
Yes. Press "Degrees" and sin, cos and tan use degrees. Press "Radians" to go back. The switch changes all graphs at once.
Are my formulas sent anywhere?
No. The formulas are read and drawn on your device. The last graph is kept in your browser, so it is there when you come back.
Good to know
- Only functions of x are supported: y = f(x) and vertical lines x = a. Polar and parametric graphs are not included
- The special points are found in the window you see, so zoom out to find more
- On a phone, drag with one finger on the graph to move it; scroll the page by touching outside the graph
- The saved PNG is 1200 pixels wide with a white background
Related tools
- Scientific Calculator — work out single values with sin, log and powers
- Statistics Calculator — mean, median and spread of your numbers
- Fraction Calculator — add, subtract and simplify fractions
- Percentage Calculator — quick percent answers
- Online Protractor — measure angles on the screen
