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The real reasons Excel has 1,048,576 rows and 16,384 columns

Excel's grid feels like an endless canvas until you hit the boundaries of row 1,048,576 or column XFD. These limits aren't random—they're digital walls shaped by history, hardware, and binary logic.
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The simple Excel function that decides if your formula spills or returns one value

If you decide to spill the results, you can then use the spilled range operator (#) to perform a calculation on the spilled range. Simply reference the first cell of the spilled range with a # ...