Convertion of units


I am in the process of creating an online visual experiment on builder view. I am presenting 8 images at equal distances from the centre (i.e. in radius 0.4 height units) and the size (w,h) of each image is (0.1, 0.1) height units. What would the conversion of these two (i.e. radius and image size) be from height units to pixels?
I am asking because I would need to include this methodological details in the report for my experiment.

Thank you

Check your screen resolution and multiply the height in pixels by .1 or .4 as appropriate