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How to sum every nth row in Excel and Google Sheets
Topic:SUM & aggregationExcel & Google Sheets
=SUMPRODUCT((MOD(ROW(B2:B7)-ROW(B2),3)=0)*B2:B7)Try it with your data
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Step by step
- 1Determine n (e.g. 3 for every 3rd row) and your data range (e.g. B2:B7).
- 2Enter =SUMPRODUCT((MOD(ROW(B2:B7)-ROW(B2),3)=0)*B2:B7). Subtracting ROW(B2) normalises the first data row to position 0, so =0 always picks the first, fourth, seventh… rows.
- 3Change 3 to any other interval (e.g. 4 for every 4th row) and adjust the =0 offset (=1 for the second row in each group, =2 for the third).
Tips
- To sum the second row in each group of 3, change =0 to =1; for the third row change to =2.
- Test with a small range first and verify visually which rows are selected before applying to a large dataset.
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Frequently asked
Can I sum every nth row from a specific starting offset?
Yes — change the =0 in the formula to =1 or =2 to shift which row in each group of n is selected.
Does this work when n does not divide evenly into the range size?
Yes. Rows that fall outside a complete group are handled correctly; the formula simply includes those that match the modulus condition.
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