lookup serch term and return sum of all values

[soilcon1]

I have a spreadsheet that has (among many other things) three columns of data
for one farm. (see abbreviated example below) One is a field identifier, the
next the practice occuring on that field, and the next the size of the field.
At the end of the ACRES column, there is a total of acres for the whole
farm. I want a function that will identify all of the same practice and give
me the total of acres for that practice so that I can find what percentage of
the practice is occuring over the whole farm. For example, I want a function
that will identify all the 441 practices and tell me that there are 19.8
acres of that practice in total. I have tried VLOOKUP to find 441 and return
values in the 3rd row, but I could not figure out how to find all the 441's
and return the total of acres for that practice. Any ideas?

FIELD PRACTICE ACRES
a 441 2.1
b 442 13.2
c 443 12.8
d 441 0.5
e 441 17.2
f 443 11.1
TOTAL 56.9

 

[bpeltzer]

What you described is what SUMIF does... =sumif(b2:b10,441,c2:c10). The
second argument is what to look for, the first is where to look for it, and
the third is what to add upon finding it.

 

[soilcon1]

That is awsome! Thanks so much, that's exactly what I needed.