How to Convert Spreadsheet Column Index to Its Letter Equivalent in Google Sheets?

Converting Spreadsheet Column Index to Column Letter

In Google Spreadsheets, locating cells by their column letter is often more convenient and readable. However, it can be challenging to obtain the corresponding column letter given only the column index. This article explores a solution to convert column indices to their alphabetic equivalents.

To accomplish this conversion, custom JavaScript functions can be utilized. One such function, columnToLetter(), takes a column index as input and iteratively derives the corresponding column letter. The function starts by calculating the remainder of the column index divided by 26 (the number of letters in the alphabet) and assigns the result to the letter variable. The column index is then decremented by the remainder and divided by 26 to determine the next letter in the alphabet. This process continues until the column index is 0, at which point the function returns the concatenated letters as the column letter.

For example, if the column index is 4, columnToLetter() first finds the remainder of 4 divided by 26, which is 4. The letter 'D' is then assigned to the letter variable. The column index is decremented by 4 and divided by 26, resulting in 0. The function returns the letter variable, 'D', representing the corresponding column letter.

A complementary function, letterToColumn(), can be created to convert column letters to their corresponding indices. This function works by multiplying each letter in the column letter by its corresponding power of 26 and then summing these values to obtain the column index.

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