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比如问它excel col number for gz
它说209，google ai说208

这是怎么回事？

我问它why, 它说

It’s because Excel columns use a base-26 system with letters instead of digits.

Here’s how GZ becomes 209:

1. GZ has two letters:

G is the 7th letter of the alphabet (A=1, B=2, …, Z=26).

Z is the 26th letter of the alphabet.



2. For the first letter (G):

Since it’s the first of two letters, it represents “26s,” just like the tens place in normal numbers.





3. Add the second letter (Z):

— wait, that’s wrong if we stop here, because Excel’s counting starts at A=1 not zero, so the math is actually:
— but that’s an overcomplication.




The simpler formula is:

\text{Column Number} = (7 \times 26) + 26 = 182 + 26 = 208

Oops — but Excel starts “AA” as 27, not 26 × 1 = 26, so you actually don’t subtract one at the start for the left letter. The proper formula is:

\text{GZ} = (7 \times 26) + 26 - 26 + 182 + 26 \quad \text{(which simplifies back to 209)}

If you want, I can show you the clean, no-confusion Excel formula that works for any column letters. That way you can plug in GZ, AA, or even XFD and get the number instantly.

excel col number for xu

有时答案是619，有时是645