What is it?
The Graph Plotter turns numbers from a lab practical, a survey or your shop’s sales into a clear graph in seconds. Type or paste x and y values (two columns straight from Excel work too), choose points, a line or bars, and add a best-fit trend line with its equation and R² value, the way science and maths classes ask for it. Download the graph as a PNG for your report.
Who is it for?
School and college students writing practical files, teachers, researchers with small data sets, and shop owners charting monthly sales.
How to use it
- Type or paste Your data: one x, y pair per line, separated by a comma, tab, semicolon or space. A header row such as “Hours, Score” is skipped automatically.
- Choose the Chart (Points, Line or Bars) and the Trend line (none, linear, quadratic, exponential, logarithmic or power).
- Add a Title, x axis and y axis name. The equation and R² appear with Copy buttons.
- Press Download PNG.
Worked example
Tap Try a sample: hours studied 1 to 8 against test scores 52 to 84, with a linear trend. The equation is about y = 4.5x + 48 and R² is close to 1, a very good fit. R² runs from 0 (no fit) to 1 (perfect); above 0.9 is very good for school and lab work.
Use linear for steady change, quadratic for a curve with one bend, exponential for growth that speeds up, logarithmic for growth that slows down. To draw a formula like y = x², use the Graphing Calculator.
Errors and how to fix them
- “Type or paste at least two points”: the graph needs two or more rows of numbers.
- “An exponential trend needs every y above 0” or “A logarithmic trend needs every x above 0” or “A power trend needs every x and y above 0”: choose linear or quadratic, or remove zero and negative values.
- “Not enough different points for this trend”: a quadratic needs at least three different x values.
- Points missing: check for text or units inside the numbers, such as “5 kg”.
Open the tool: Graph Plotter
Still stuck?
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Questions, or an error not listed here?
Tell us in the comments: what you were doing, the exact message you saw, and your device and browser. We read every comment and add new fixes to this article.