How to Convert Between Google Sheets Column Index and Letter?

Convert Column Index to Corresponding Column Letter

Google Sheets provides a convenient way to represent data in a tabular format. Each cell within a spreadsheet is assigned a specific coordinate consisting of a row and column. The column is typically indicated using a letter (e.g., "A", "B", "C", etc.).

Converting Column Index to Column Letter

In certain scenarios, converting a numeric column index to its corresponding letter value becomes necessary. For instance, if you wish to reference a specific cell within a formula or script, it's essential to use the appropriate column letter.

The provided JavaScript functions offer a solution to this problem:

columnToLetter(column): This function converts a column index to its corresponding letter value. For example, 4 will return "D", 1 will return "A", and 6 will return "F".

letterToColumn(letter): This function performs the reverse operation, converting a column letter to its corresponding index. For example, "D" will return 4, "A" will return 1, and "F" will return 6.

Implementation

function columnToLetter(column) {
  var temp, letter = '';
  while (column > 0) {
    temp = (column - 1) % 26;
    letter = String.fromCharCode(temp + 65) + letter;
    column = (column - temp - 1) / 26;
  }
  return letter;
}

function letterToColumn(letter) {
  var column = 0, length = letter.length;
  for (var i = 0; i < length; i++) {
    column += (letter.charCodeAt(i) - 64) * Math.pow(26, length - i - 1);
  }
  return column;
}

Usage

These functions can be utilized as follows:

console.log(columnToLetter(4)); // "D"
console.log(columnToLetter(1)); // "A"
console.log(columnToLetter(6)); // "F"
console.log(letterToColumn("D")); // 4
console.log(letterToColumn("A")); // 1
console.log(letterToColumn("F")); // 6

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