# Average price depending on the day of the week

#### Patrick69

##### New Member
Hi All,
Long time reader but first time poster...
I have been searching everywhere for a simple solution to get the average fuel cost depending on which day of the week it is. In other word, how much does fuel cost on Mondays, Tuesdays, etc.
This is my unsuccessful attempt:
=SUMIF(A1:A100,"Monday", B1:B100)/COUNTIF(A1:A100,"Monday")
Where column A has dates and B has the prices I paid per gallon on that day.
I also tried using a 3rd column with just the day of the week (using =A1 and formating to return the day only) but no luck. #DIV/0! Using just SUMIF doesn't work either.
My problem I think is the day...
I am using Excel 2003.
Patrick

### Excel Facts

Enter current date or time
Ctrl+: enters current time. Ctrl+; enters current date. Use Ctrl+: Ctrl+; Enter for current date & time.

#### AlphaFrog

##### MrExcel MVP
Put this in column C to get the day of the week from the dates in column A

=TEXT(A1, "dddd")

Then use this to Average the Mondays

=SUMIF(C1:C100,"Monday", B1:B100)/COUNTIF(C1:C100,"Monday")

This works as well....
C1
=Weekday(A1)

=SUMIF(C1:C100, 2, B1:B100)/COUNTIF(C1:C100, 2)

Day of the week, with numbers 1 (Sunday) through 7 (Saturday)

Last edited:

#### Peter_SSs

##### MrExcel MVP, Moderator
Welcome to the MrExcel board!

You could also try these. Each is an array formula so should be confirmed with Ctrl+Shift+Enter, not just Enter. If confirmed correctly, Excel will insert {} around the formula.

=AVERAGE(IF(WEEKDAY(A1:A100)=2,B1:B100))

=AVERAGE(IF(TEXT(A1:A100,"ddd")="Mon",B1:B100))

#### Patrick69

##### New Member
AlphaFrog, this works a treat. Many thanks!

#### Patrick69

##### New Member

Peter SSs, I can't make this solution work???
Will it work with Excel 2003?
Excel is not placing the {} and the result is #VALUE!
My A column is formatted to show 19-Aug-2010. Would that make a difference?
Thanks,
Patrick

#### Patrick69

##### New Member
Mmmmm. Just done it on a new sheet and it works fine... It fails because some days I did not record the date and have placed "???" in the cell. I know there is a way to disregard cells. I will try to find out how. The formula might get ugly though.
Patrick.

#### AlphaFrog

##### MrExcel MVP

This array formula will ignore the cells with ??? or any other text

=AVERAGE(IF(ISERROR(WEEKDAY(A1:A100)),"",IF(WEEKDAY(A1:A100)=2,B1:B100,"")))

Again, this is an array formula. So enter it with Ctrl+Shift+Enter

#### Patrick69

##### New Member
Here is my final solution:
Column A is formatted as ddd, dd mmm yyyy
No need for a separate day of the week column
=AVERAGE(IF(TEXT(A1:A100,"ddd")="Mon",B1:B100)) is used
And a blank or any other text cell like my ??? are automatically ignored.
Et voilà! A very big thanks to both of you.
Patrick

#### Peter_SSs

##### MrExcel MVP, Moderator
Here is my final solution:
Column A is formatted as ddd, dd mmm yyyy
No need for a separate day of the week column
=AVERAGE(IF(TEXT(A1:A100,"ddd")="Mon",B1:B100))
Yep, that was suggested back in post #3.

Note though that formatting column A as "ddd, dd mmm yyyy" is not necessary for the formula to work. Column A just needs to be Dates.

#### Patrick69

##### New Member
Interesting! I had assumed (should never do that) that the actual text needed to be present. So following that principal, I assume (will verify as you should never...) that =AVERAGE(IF(WEEKDAY(A1:A100)=2,B1:B100)) would also work as is? But I do prefer your 2nd suggestion as it does not have the risk of getting the wrong day. (Intuitively for me, 1 is Monday).

I need to read about array formulas. I have a feeling that I experimented before unsuccessfully possibly because I had no idea about this array formula thing. Should I be able to see the {}? And if yes, where? Although all is working I do not see them?

Regards, Patrick

Replies
8
Views
105
Replies
18
Views
318
Replies
1
Views
82
Replies
5
Views
120
Replies
7
Views
762

1,127,554
Messages
5,625,474
Members
416,109
Latest member
TripleA00123

### We've detected that you are using an adblocker.

We have a great community of people providing Excel help here, but the hosting costs are enormous. You can help keep this site running by allowing ads on MrExcel.com.

### Which adblocker are you using?

1)Click on the icon in the browser’s toolbar.
2)Click on the icon in the browser’s toolbar.
2)Click on the "Pause on this site" option.
Go back

1)Click on the icon in the browser’s toolbar.
2)Click on the toggle to disable it for "mrexcel.com".
Go back

### Disable uBlock Origin

Follow these easy steps to disable uBlock Origin

1)Click on the icon in the browser’s toolbar.
2)Click on the "Power" button.
3)Click on the "Refresh" button.
Go back

### Disable uBlock

Follow these easy steps to disable uBlock

1)Click on the icon in the browser’s toolbar.
2)Click on the "Power" button.
3)Click on the "Refresh" button.
Go back