=SUMPRODUCT((LEFT(A1:D1)="S")*(MID(A1:D1,2,20)))
best wishes
--
Bernard Liengme
Microsoft Excel MVP
http://people.stfx.ca/bliengme

"Trevor Little" <Trevor wrote in message
...
Is it possible to use the Sumif function to add numbers with a specific
designator in front of it?

Eg.
A row contains strings like: S8, S10, V5, S5

Is there a formula that can total the S's? (Total would be 23)