There is a better way to sum every other row in Excel, and the fact that this user found themselves staring at a formula stretching through row 150 is exactly why we need to talk about this. The original approach, manually adding each range with a plus sign, works in the narrowest sense, but it is fragile, tedious, and frankly, a trap for anyone who doesn't live in spreadsheets daily. This user has a basic understanding of Excel, and they still knew something was off. That instinct is worth honoring.
What they need is a method that does not scale with the number of rows. The classic alternative is an array formula that checks whether a row is even or odd, then sums only the matching rows. Something like `=SUMPRODUCT((MOD(ROW(F31:I51),2)=1)*F31:I51)` would handle the entire range in one clean pass. The MOD function returns the remainder when each row number is divided by two, and the SUMPRODUCT multiplies that logical test by the data itself, summing only the cells where the row number is odd. It is not a new trick, but it is one that transforms a monstrous formula into something you can read at a glance. And because the user is on the latest Microsoft 365 version, they also have access to dynamic arrays, which means even more elegant solutions using `FILTER` or `LET` are available if they want to take it a step further.
The deeper point here is about how we approach tools we do not use daily. It is easy to assume that the first working method is the only method, especially when you are not confident in your formula skills. But the moment you catch yourself copying and pasting a pattern dozens of times, that is the signal to stop and ask if there is a smarter way. This user did exactly that, and they should be credited for it. The real cost of the original formula is not the time spent typing it; it is the risk of missing a row, duplicating a range, or having to update every single term when the data changes. A single structured formula removes all of that fragility.
So if you are the one who has a similar spreadsheet sitting on your desktop, take the extra ten minutes to learn `MOD` and `SUMPRODUCT`, or even just look up how to use `LET` to name your ranges clearly. The payoff is not just a shorter formula; it is a workbook that you can open six months from now and actually understand. That is the real transformation here, not just summing rows, but building confidence in the tools you use. Start with one formula, test it on a small range, and then apply it to the full dataset. You will wonder why you ever did it the long way.