@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