I use the same system: same drinking glass for measurement purposes, and the scale, and enter it all on the chronometer app. I'm getting pretty efficient with all that. I'm getting enough calcium without supplements most days. My current supplement, Osteo Sustain, a McCormick product, has a small amount, about 165 mg calcium per tablet, along with other nutrients, designed to be taken 3 times a day. I'm currently trying to figure out how to tease all those apart to get what I need without the added calcium. It is definitely simpler just to take the one.