Graphing Calculator guide
Graphing Calculator: Plot Functions Online for Free
Use our free online graphing calculator to plot up to four functions, zoom, drag and read exact values. Includes tips for plotting trig, quadratic and exponential graphs.
By the AllCalculator editorial teamUpdated 15 October 20262 min read
A graph turns an equation into a picture, so you can see where it crosses the axes, where it turns and how it behaves. Our Graphing Calculator plots up to four functions at once in your browser, with no download or sign-up.
How to use the calculator (Graphing Calculator)
- Type a function of x in each box, for example sin(x) or x^2 − 3.
- The graph appears straight away, with each function in its own colour.
- Drag the graph left or right, or use Zoom in and Zoom out.
- Hover or tap to read the exact value of each function at that x.
- Set the x range yourself, or press Reset to go back to −10 to 10.
The y-axis scales automatically to fit the curves, ignoring short spikes near asymptotes.
What you can type
- Powers: x^2, x^3, 2^x
- Roots: sqrt(x), cbrt(x)
- Trigonometry in radians: sin(x), cos(x), tan(x)
- Logs and exponentials: ln(x), log(x), exp(x), e^x
- Constants: pi and e
- Implied multiplication: 2x, 3sin(x), x(x − 1)
Things to try
- Compare transformations: plot x^2, (x − 2)^2 and x^2 + 3 together to see shifts.
- Find intersections: plot two lines and hover where they cross.
- See asymptotes: 1/x and tan(x) break at vertical asymptotes, and the graph lifts the pen there.
- Spot roots: where a curve crosses the x-axis, its value is 0.
For 3D surfaces, try our 3D Graphing Calculator. To find the gradient at a point, use our Derivative Calculator, and for the area under a curve, our Integral Calculator.
Frequently asked questions
Does the graphing calculator use degrees or radians?
Radians, as most graphing tools do. To use degrees, multiply by pi/180, for example sin(x × pi / 180).
Can I plot more than one function?
Yes. You can plot up to four at once, each in its own colour.
Can I use it on my phone?
Yes. It works on phones and tablets: tap the graph to read values and use the zoom buttons.
Graphs make algebra easier to understand. Try the Graphing Calculator with your next homework question.
Sources and further reading
Links open official and independent websites in a new tab.
This guide is general information to help you understand your options. It isn't financial, tax, legal or building advice and doesn't take your personal circumstances into account. Figures were checked when the guide was last updated and can change, so confirm anything important with GOV.UK, HMRC, a regulated adviser or a qualified tradesperson.