Alternately you could use

=SUMPRODUCT((A2:A10="Yvonne")*(B2:B10=4),C2:C10)

Joining conditions with "*" does the same thing as prefixing each
condition with "--"; it converts the boolean condition array to 0's and
1's. Which form is preferable is largely a matter of taste. I prefer
this form because
- it reduces the formula length by 2 characters per condition
- IMHO it is easier for a new user to understand (some will disagree)
- It generalizes to more complicated combinations of conditions. Use
"+" instead of "*" to join the conditions with OR instead of AND. If
you combine more than two conditions, some with "*" and some with "+",
you can use parentheses to control the order of evaluation.

Jerry

Simon wrote:

Hi I need to do a function, I have the following columns and some sample data

Name Week Number. Estimated Hours
Yvonne 4 2
Yvonne 4 3
Simon 4 5
Yvonne 5 1

What i want to do is, for each person i want to some their total estimated
hours for week 4.
So in pseudocode im trying to do this:
SUM the estimated hours where the name = Yvonne and the week number = 4.
The answer should be 5 for this example

Can someone please help me to do this, im struggling.

Thanks.
Simon