Element size question

[KimB3384]

Is there a way to tell what size an element is? 

For context, I'm creating a water bottle for a client. I want to have circles spaced on the design so that people can get a sticker badge for completing a course, and I want them to have a guideline spot to place it. The stickers are going to be 1.5" in diameter, but for the life of me I can't figure out how to tell the size of the circles I'm creating on the template. I could even create the entire background as an Illustrator file and upload it, but I would have no idea what size to make it since there are no specs provided, other than the product dimensions. 

Has anyone done anything similar and had luck?

[BKMuir]

1. Which size of stainless steel water bottle are you designing.
    a. the clear bottles only have 8"x2.125" labels
    b. the stainless steel come in 2 sizes with design areas of approx. 5"x8" and 3.75"x*" (measurements guessed at using the SETTINGS/SHOW GRID LINES)

Here is my attempt on the smaller 18 oz. bottle One might be able to get another row of 5 aligned circles, or at least 4 staggered circles, on the larger bottle.

Even distribute of circles stainless steel water bottle
by bkmuir