Calculate number of weeks in a month in MS Excel 2013

Assuming the 1st of the month is entered in A1 as a date then

=DAY(EOMONTH(A1,0))/7

While using the below formula I am getting error.

=INT(DAY(EOMONTH(B2,0))/7) &" weeks"

However, =INT(DAY(EOMONTH(B2,0))/7) is working fine but not getting any result for other months.

This works for me
WEEKS-IN-MONTH.xlsx

01-10-206 isn't a date ...

Well spotted. I didn't use the OP's table.

Thanks. It's working now.

Pleased to help

What was the point of the question?

All months have 4 weeks. Different months then have zero, two or three more days; 28 for Feb, 30 for April, June, September and November; all the rest have 31.

However, if you are counting only WHOLE weeks starting on a particular day, there could be differences.

For example, for the items listed in your table, assuming whole weeks starting on Sunday:

First Sunday in September was 4 September, last Saturday (to give whole weeks) in September is 24 September. 4 Sept to 24 Sept is 3 whole weeks.
October - First Sunday 02 Oct, Last Saturday 29 Oct, gives 4 weeks
November - First Sunday 06 Nov, Last Saturday 26 Nov, gives 3 weeks
December - First Sunday 04 Dec, Last Saturday 31 Dec, gives 4 weeks.

Thanks
Rob H

This formula will give number of whole weeks:

=(IF(WEEKDAY(EOMONTH(N3,0))=7,EOMONTH(N3,0),FLOOR(EOMONTH(N3,0),7))-IF(WEEKDAY(N3,1)=1,N3,CEILING(N3,7)+1)+1)/7

Date in cell N3. The bold 7 assumes week ending Saturday, the bold 1 assumes week starting Sunday.

Looks like you don't need the WEEKDAY check for the last day of the month:

=(FLOOR(EOMONTH(N3,0),7)-IF(WEEKDAY(N3,1)=1,N3,CEILING(N3,7)+1)+1)/7

Prior formula assumes weeks beginning Sunday.

This assumes week beginning Monday, ie whole working weeks:

=(IF(WEEKDAY(EOMONTH(N3,0))=1,EOMONTH(N3,0),FLOOR(EOMONTH(N3,0),7)+1)-IF(WEEKDAY(N3,1)=2,N3,CEILING(N3,7)+2)+1)/7

Thanks
Rob H

Hi @Rob.

Your answer doesn't seem to work when the first of the month is a Sunday.

The corrected formula should be

=(IF(WEEKDAY(EOMONTH(N3,0))=1,EOMONTH(N3,0),FLOOR(EOMONTH(N3,0),7)+1)-IF(WEEKDAY(N3;1)=2;N3;N3+(7-WEEKDAY(N3;2)+1))+1)/7