This array formula (Ctrl+Shift+Enter) also seems to work provided the first
cell (A1) is not empty and no cells in the range contain error value:

=SUM(LEN(A1:A10))-SUM(IF(ISERROR(--(MID(A1:A10,COLUMN(INDIRECT("1:"&LEN(A1:A10))),1)) ),0,1))

Regards,
KL


"KL" <lapink2000(at)hotmail.com wrote in message
...
Iviio,

Try this:

=SUMPRODUCT(LEN(A1:A10))-SUMPRODUCT((LEN(A1:A10)<LEN(SUBSTITUTE(A1:A10,{"
",0,1,2,3,4,5,6,7,8,9},"")))*(LEN(A1:A10)-LEN(SUBSTITUTE(A1:A10,{"
",0,1,2,3,4,5,6,7,8,9},""))))

or this

=SUMPRODUCT((LEN(A1:A10)<LEN(SUBSTITUTE(UPPER(A1: A10),{"A","B","C","D","E","F","G","H","I","J","K", "L","M","N","O","P","Q","R","S","T","U","V","W","X ","Y","Z"},"")))*(LEN(A1:A10)-LEN(SUBSTITUTE(UPPER(A1:A10),{"A","B","C","D","E", "F","G","H","I","J","K","L","M","N","O","P","Q","R ","S","T","U","V","W","X","Y","Z"},""))))

Regards,
KL


"Iviio" wrote in message
...
I can use formulas to calculate numbers or figures. How do I sum up
letters
in a range of cells?