yes, to a way
if by "tabs" you mean worksheets (not chart sheets)
let's presume yr "first" worksheet in Sheet1, and Sheet100 is the last
one, ale other woksheets placed between Sheet1 and Sheet100
if A1 cells are unused in each and every tab in yr workbook
select A1
select all your worksheets by right clicking on any of them and
"select all sheets"
insert 1 into A1
then (say) in B1 of Sheet1 insert the formula:
=SUM(Sheet1:Sheet100!A1)
the result will be the number of all worksheets (including hidden) in
the workbook
HIH