Measuring multiple ROIs at once

If I’ve selected multiple ROIs in different colours, when I measure it, I only get 1 area instead of one for each ROI. How do I get the separate measurements for each ROI?

If you add the ROI’s to the ROI Manager you can measure selected ROI’s (or all if none is selected) with the “Measure” command, see:

https://imagej.nih.gov/ij/docs/guide/146-30.html#sub:ROI-Manager