How to calculate sum of multiplied rows in Excel

Question

Please kindly help me to examine this sheet:

My current formula at cell C3 is C3=D3*F3+E3*G3+H3*J3+I3*K3 I would like to know if there is any better formula because the real sheet has around 30 projects.

Thanks in advance,

Answer 1

Assuming your 30 projects span from D3:DS3, try this formula:

=SUM($D$3:$DS$3*(MOD(COLUMN($D$3:$DS$3),4)=0)*$F$3:$DU$3*(MOD(COLUMN($F$3:$DU$3),4)=2))+
SUM($E$3:$DT$3*(MOD(COLUMN($E$3:$DT$3),4)=1)*$G$3:$DV$3*(MOD(COLUMN($G$3:$DV$3),4)=3))

You need to enter it as array formula, i.e. instead of pressing Enter at the end, press Ctrl-Shift-Enter!

Answer 2

You can use sumproduct formula to complete this task if you are using excel 2007 or above.

Answer 3

Just put in the first cell address and last cell address, using the product expression

C3 = PRODUCT(D3:K3)