Artificial grass measuring is relatively simple and straightforward. Artificial turf is manufactured similarly to household carpet in rolls of 4m and 2m wide.
First step is to measure the area in metres just the width and depth, which you would like to cover in artificial grass i.e. 4m by 20m
Divide the area into 4m width and then you can work out the length required
Curves can be accommodated easily, by simply cutting the grass with a stanley knife