How to calculate weekly average in Excel?

We have introduced the way to calculate averages per day/month/quarter/hour with pivot table in Excel before, but this method can't calculate the averages per week. Here I will introduce a way to calculate the weekly averages with a help columns in Excel easily.

Calculate weekly averages with Excel functions

Supposing we have a purchase table as following screen shot shown, and we will take this table as an example to describe the way to calculate weekly averages in detail.

Step 1: Besides original purchase table, enter WeekNUM in Cell D1, and then enter the formula =WEEKNUM(A2,2) (Note: A2 is the cell with purchase date in Date/Time column) into Cell D2, and then drag the Fill Handle to the range we need. Now the week numbers are displayed in the WeekNUM column. See screenshot:

Step 2: This step is optional. If the purchase dates cover several years, you may want to calculate the weekly averages in the same year. Enter Year in the Cell E1, and enter the formula =YEAR(A2) (Note: A2 is the cell with purchase date in Date/Time column) into Cell E2, and then drag the Fill Handle to the range we need.

Step 3: In Cell F1 enter Average, and then enter the formula =IF(AND(D2=D1,E2=E1),"",AVERAGEIFS(\$C\$2:\$C\$39,\$D\$2:\$D\$39,D2,\$E\$2:\$E\$39,E2)) into Cell F2, and then drag the Fill Handle to the range we need.

Notes:
(1) If two purchases occurred in the same week of same year, the formula of =IF(AND(D2=D1,E2=E1),"",AVERAGEIFS(\$C\$2:\$C\$39,\$D\$2:\$D\$39,D2,\$E\$2:\$E\$39,E2)) will return blank; if not, it will return the weekly average.
(2) And in this formula, D1 and D2 are cells with week numbers, E1 and E2 are cells with years, \$C\$2:\$C\$39 is the range you will calculate weekly average, \$D\$2:\$D\$39 is the WeekNUM column you will evaluate by week numbers, \$E\$2:\$E\$39 is the Year column you will evaluate by years, and you can change them based on your needs.

(3) If you want to calculate the weekly averages but ignoring years, you can enter the formula =AVERAGEIF(\$D\$2:\$D\$39,D2,\$C\$2:\$C\$39) into Cell F2 and drag the Fill Handle to the range you need. And you will see the weekly averages as below screen shot shown:

Batch calculate all weekly averages with Kutools for Excel

This method will introduce Kutools for Excel's To Actual utility and Advanced Combine Rows utility to batch calculate all weekly averages at ease.

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1. Besides original purchase table, enter Week in Cell D1, and then enter the formula =WEEKNUM(A2,2) (Note: A2 is the date cell in Date/Time column) into Cell D2, and then drag the Fill Handle to the range we need.

2. Select the purchase table with new Week column, and click the Kutools > Content > Advanced Combine Rows.

3. In the opening Combine Rows Based on Column dialog box, you need to (see screenshot below):
(1) Click the Fruit column in the Column list, and click the Combine > Comma;
(2) Click the Amount column, and click the Calculate > Average;
(3) Click the Week column, and click the Primary Key;
(4) Click the Ok button.

So far all weekly averages are calculated with corresponding fruits are listing besides the averages as below screenshot shown:

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