Letter Grade to Percentage & GPA Converter
Instantly convert any letter grade (A+ through F) into its corresponding percentage range, exact midpoint, and 4.0 scale GPA equivalent. Use the school selector to apply different standard grading scales.
Conversion Results
Percentage Range
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Exact Midpoint %
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GPA Equivalent (4.0)
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School Custom Grading Scale
You can customize the percentage boundaries below. The changes will be applied automatically when "School-Specific Scale" is selected above.
Full Grading Scale Reference
The table below reflects the currently selected grading scale for quick comparison.
| Grade | Percentage Range | GPA (4.0) |
|---|
Understanding and Using the Letter Grade Converter
Welcome to the definitive guide for converting academic letter grades into numerical percentages and Grade Point Averages (GPA). As academic systems around the world rely on varying scales—from the standard 90-80-70-60 model to detailed plus/minus systems—this converter provides the clarity needed for reporting, transfer applications, and personal tracking. Understanding the precise numerical value of a letter grade is essential for calculating overall performance, particularly in higher education and competitive scholarship applications.
How to Use the Calculator
The process is designed to be straightforward:
- Select Your Grade: Choose the letter grade (A+ to F) from the first dropdown menu.
- Choose Your Scale: Select the grading standard used by your institution (e.g., Plus/Minus Scale). If your school uses unique boundaries, use the "School-Specific Scale" option after adjusting the percentages in the customization section.
- Calculate: Click the "Calculate Conversion" button.
- Review Results: The results area will instantly display three key metrics: the typical percentage range (e.g., 93–96%), the exact midpoint percentage, and the equivalent GPA on the standard 4.0 scale.
Calculation Formulas and Methodology
The core logic of this converter relies on pre-defined, commonly accepted academic grading scales. The calculation formula is primarily a lookup function, but the derived values use simple arithmetic:
Percentage Range Determination
This is determined by the selected grading scale. For example, in the Plus/Minus Scale: $$A = 93\% \text{ to } 96\%$$ $$B+ = 87\% \text{ to } 89\%$$ The system maps the input letter grade to its corresponding minimum and maximum percentage bounds defined in the chosen scale.
Exact Midpoint Percentage
To provide a single, representative numerical score, the calculator uses the midpoint of the percentage range:
$$ \text{Midpoint Percentage} = \frac{\text{Minimum Percentage} + \text{Maximum Percentage}}{2} $$For example, for an A- grade on the Plus/Minus scale (90-92%): Midpoint $= (90 + 92) / 2 = 91\%$. This is often used for simplified comparisons.
GPA Equivalence (4.0 Scale)
The GPA value is also scale-dependent and based on academic standards. The 4.0 scale assigns points as follows (Plus/Minus example): $$ \text{A+} / \text{A} = 4.0 $$ $$ \text{A-} = 3.7 $$ $$ \text{B+} = 3.3 $$ $$ \text{B} = 3.0 $$ This conversion is crucial for calculating cumulative GPA across multiple courses.
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Frequently Asked Questions (FAQ)
The Traditional scale simplifies grades into ten-point blocks (e.g., 90-100% is A, 80-89% is B), often assigning a flat GPA (e.g., B=3.0). The Plus/Minus scale uses finer increments (e.g., A=93-96%, A-=90-92%), which results in more granular GPA values (e.g., B+=3.3, B=3.0, B-=2.7). The Plus/Minus scale is generally considered more precise for academic reporting.
The 4.0 scale is a standard system where a perfect grade (A or A+) equals 4.0 points. Other letter grades are assigned corresponding values (e.g., B=3.0, C=2.0). The conversion is a fixed mapping based on the selected scale. Note that weighted GPAs (for AP or Honors classes) are not calculated here, as this tool focuses on the standard unweighted conversion.
Yes, you can. Use the 'School Custom Grading Scale' section below the main calculator. You can adjust the minimum percentage for each letter grade. Once you apply the custom scale, select 'School-Specific Scale' in the main converter to use your new boundaries for calculations.
The Exact Midpoint Percentage is the average of the minimum and maximum percentages associated with the selected letter grade. For example, if a grade is defined as 83% to 86%, the midpoint is 84.5%. This single value provides a simplified, non-range number often used for internal school data tracking or quick estimates.
Yes, the entire interface, including the input fields, results section, and comparison table, is designed using responsive web development techniques to ensure optimal viewing and usability on mobile phones, tablets, and desktop computers.
