so, do you want to see weight loss between each interval, or just at the end?

If just at the end, you really don't need to know each week, just beginning
and end.

If you want a weekly amount, I would insert a column to the right starting
with.. =B3-B4. copy to bottom and you have your interval amounts. Then, sum
at bottom for total.

"KatJones" wrote:

I am trying to track weight loss for 4 friends over 13 weeks. (Cells B3-B15,
C, D, E)

B17 is where I want my results. What formula do I need? I think I'm thinking
about it too much!