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@mustadirmahmood,
The dataPoints in a chart are plotted based on pixel coordinates. You can convert millimeter to pixel value by multiplying it by 3.7795. Please find the code snippet below.
function convertMillimeterToPixel(mm) { return (mm * 3.7795); }
Please take a look at this JSFiddle for an example on setting chart width & height in millimeters. You can use legendText to display the scale-ratio.
— Thangaraj Raman Team CanvasJS