Question

I’m trying to make one formula that calculates:
SUM[ Qi * (P1i - P2i), i=1 to n]

Example:

 Q           X               P1     P2
 100         2,261.00    22.61  22.59
 19,600      200,151.39      10.21  10.18
 10,700      800,008.00      74.77  74.84

[100 * (22.61 – 22.59 )] + [19,699 * (10.21 – 10.18)] + ….

I can do an workaround adding one column with my first calculation and then SUM the column. But i’m just curious if i could do this different.

Answer 1

You could try a SUMPRODUCT (assuming your data starts in A2):

=SUMPRODUCT(A2:A4,(C2:C4-D2:D4))

And extend the 4 to the boundary you want.