This is basically what I did, and posted it in the other loop sizing thread. But, what I did was print out the sizing chart, make sure to get that right. Then, I connected my nike sport band together to the loop I use for a slightly snug fit. I layed it down ON the picture with the top of the strap (connected together appropriately) at the base of the watch face image on the page. It layed down on the page below and the other end of my connected strap indicated which size to buy. It was the same number as when I tried to use the cut out to wrap around my wrist. Frankly, this type of sizing measurement would be much better for most (assuming they already have a sport band to try it with)