Unlock the Magic of Automated Grade Conversion in Google Sheets

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Unlock the Magic of Automated Grade Conversion in Google Sheets! 🧙✨

Tired of manually converting numeric grades to letter grades in your Google Sheets? We’ve got the ultimate solution for you! In our latest video, we’ll introduce you to a custom Google Apps Script that takes the tedium out of grading and automates the process for you.

📈 Here’s what you’ll discover in this video:

✅ The CONVERT_TO_LETTER_GRADE function: Learn how to use this powerful function to convert numeric grades to letter grades for an entire list of students or assignments. ✅ Real-world applications: We’ll demonstrate how this script can be applied in various scenarios, such as grading students’ scores or converting test results. ✅ Customizable grade scales: You can set up your own grade scale to suit your specific grading system or academic institution.

You don’t need to be a coding expert to implement this script; we’ll guide you step by step through the setup process. It’s a game-changer for educators, students, and anyone managing grades in Google Sheets.

Don’t miss this opportunity to simplify your grading and save time! Join us for this essential tutorial.

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CONVERT_TO_LETTER_GRADE

In this example, we’ll create a custom formula that converts a numeric grade into a letter grade using a custom grading scale.

Scenario: You want to create a custom formula that converts a numeric grade into a letter grade using a custom grading scale.

function CONVERT_TO_LETTER_GRADE(numGrades,gradeScale){

const letterGrades = [];

for(let i=0;i<numGrades.length;i++){

const numGrade = numGrades[i];

const letterGrade = getLetterGrade(numGrade,gradeScale);

letterGrades.push([letterGrade]);

}

return letterGrades;

}

function getLetterGrade(numGrade,gradeScale){

for(let i=0;i<gradeScale.length;i++){

if(numGrade>=gradeScale[i][0]){

return gradeScale[i][1];

}

}

return “”;

}

The provided Google Apps Script code defines two functions, CONVERT_TO_LETTER_GRADE and getLetterGrade, which work together to convert numeric grades into letter grades based on a specified grade scale. Below is a detailed explanation of how these functions work:

1. getLetterGrade(numGrade, gradeScale) Function:

This function is responsible for converting a numeric grade (numGrade) into its corresponding letter grade based on the provided grade scale (gradeScale). The function works as follows:

  • It starts by initializing an empty string to store the letter grade.
  • It uses a for loop to iterate through the gradeScale array. The gradeScale array is expected to contain pairs of numeric grade thresholds and their corresponding letter grades.
  • For each iteration, it checks if numGrade is greater than or equal to the numeric grade threshold in the gradeScale. If the condition is met, it returns the corresponding letter grade.
  • If no match is found in the gradeScale after looping through all the thresholds, the function returns an empty string, indicating that no letter grade was found for the given numeric grade.

2. CONVERT_TO_LETTER_GRADE(numGrades, gradeScale) Function:

This function is designed to convert an array of numeric grades (numGrades) into an array of their corresponding letter grades using the getLetterGrade function. The function works as follows:

  • It initializes an empty array called letterGrades to store the resulting letter grades.
  • It uses a for loop to iterate through the numGrades array. For each numeric grade in the array, it calls the getLetterGrade function to obtain the corresponding letter grade based on the provided gradeScale. The letter grade is then stored in the letterGrades array as an element within its own array.
  • Finally, it returns the letterGrades array, which contains the converted letter grades corresponding to the input numeric grades.

In summary, these functions are used to convert numeric grades to letter grades based on a given grade scale. The getLetterGrade function is responsible for finding the appropriate letter grade based on the numeric grade and the provided scale, while the CONVERT_TO_LETTER_GRADE function facilitates the conversion for an array of numeric grades.

Data Table:

Numeric GradeLetter Grade
95A
80B
63C

Custom Grading Scale:

EF
Lower LimitLetter Grade
90A
80B
70C
60D
0F

Step 1: Setting up the Spreadsheet

  • Create a new Google Sheets document.
  • Enter the numeric grades in column A starting from row 2.
  • Leave cells in column B empty for now.
  • Enter the lower limits and corresponding letter grades in columns E and F.

Step 2: Writing the Google Apps Script Code

  • Click on “Extensions” in the top menu, then select “Apps Script”.
  • Delete any default code and replace it with the following script:

// Custom formula to convert numeric grade to letter grade

function CONVERT_TO_LETTER_GRADE(numericGrades, gradeScale) {

  var letterGrades = [];

  for (var i = 0; i < numericGrades.length; i++) {

    var numericGrade = numericGrades[i];

    var letterGrade = getLetterGrade(numericGrade, gradeScale);

    letterGrades.push([letterGrade]);

  }

  return letterGrades;

}

// Helper function to get the letter grade based on the grade scale

function getLetterGrade(numericGrade, gradeScale) {

  for (var i = 0; i < gradeScale.length; i++) {

    if (numericGrade >= gradeScale[i]) {

      return gradeScale[i][1];

    }

  }

  return “”; // Default to empty if grade is not found in scale

}

Step 3: Using the Custom Formula in Google Sheets

  • Go back to your Google Sheets document.
  • In cell B2, enter the following formula:

=CONVERT_TO_LETTER_GRADE(A2:A, E2:F)

Explanation of the Code:

  • The function CONVERT_TO_LETTER_GRADE converts numeric grades to letter grades using a custom grading scale.
  • It takes two parameters: numericGrades and gradeScale.
    • numericGrades: The range of cells containing the numeric grades to be converted.
    • gradeScale: The range of cells containing the lower limits and corresponding letter grades for the grading scale.
  • Inside the function, a loop iterates through each numeric grade.
  • The getLetterGrade helper function is used to determine the letter grade based on the numeric grade and the grading scale.
  • The calculated letter grades are stored in the letterGrades array.
  • The function returns the array of converted letter grades.

Step 4: Testing the Custom Formula

  • Enter numeric grades in column A starting from row 2.
  • Enter the lower limits and corresponding letter grades in columns E and F.
  • Use the custom formula in cell B2 to convert the numeric grades into letter grades based on the custom grading scale.

For example, if you have entered the numeric grades and grading scale as shown in the data table, the corresponding letter grades should appear in column B.

Remember to enable the “Google Apps Script” extension and use the exact function name (CONVERT_TO_LETTER_GRADE) in your formula.