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How to sum numbers from 1 to n in Excel worksheet?

In Excel worksheet, we can use the SUM function to calculate a list of numbers quickly and easily. However, when you want to sum numbers from 1 to n, do you have any good formula to solve this task?

Sum numbers from 1 to n with formula in Excel

Sum numbers from 1 to n with formula in Excel

For example, I will sum numbers from 1 to 150, the following formula can do you a favor, please do as this:

Enter this formula: =SUMPRODUCT(--(ROW(INDIRECT(B1&":"&B2)))) into a blank cell where you want to get the calculated result, and then press Enter key, the numbers from 1 to 150 have been added up as following screenshot shown:

Note: In the above formula, B1 and B2 are the first and last number that you want to sum from.

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Comments (2)
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This comment was minimized by the moderator on the site
What does the "--" in the formula: =sumproduct(--Row(Indirect(B1&":"B2))) do to the formula?
This comment was minimized by the moderator on the site
I just used this formula and was able to remove the double negative. Having 1 negative, made the result negative, having 2, made it positive -- so not sure why it is there, but afaik, its not needed.
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