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# (Excel examples for Beginners)

In this end-to-end excel example, you will learn – Excel formula for Beginners – How to Sum by week number in Excel.

### Generic formula

`=SUMIFS(sumrange,weekrange,week)`

### Explanation

To sum by week number, you can use a formula based on the SUMIFS function. In the example shown, the formula in H5 is:

`=SUMIFS(total,color,\$G5,week,H\$4)`

where total (D5:D16), color (B5:B16), and week (E5:E16) are named ranges.

### How this formula works

The SUMIFS function can sum ranges based on multiple criteria.

In this problem, we configure SUMIFS to sum amounts in the named range total by week number using two criteria:

1. color = value in column G
2. week = value in row 4
`=SUMIFS(total,color,\$G5,week,H\$4)`

Note \$G5 and H\$4 are both mixed references, so the formula can be copied across the table.

Column E is a helper column, and contains the WEEKNUM function:

`=WEEKNUM(C5)`

Week numbers in row 4 are numeric values, formatted with a special custom number format :

`"Wk "0 // display as Wk 1, Wk 2, etc.`

This makes it possible to match week numbers in row 4 with week numbers in column E.

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