Percentage to GPA Converter: US Letter Grade Scale with Cutoff Comparison

Match the percentage to a letter grade using your school’s cutoffs, then look up the GPA value for that letter grade. Enter the percentage in the calculator above and it performs both steps instantly. Avoid the linear formula (pct / 100 times 4) which is mathematically inaccurate for US GPA because it ignores the threshold-based structure of letter grades. A 78% and an 89% are both B+ under most plus/minus conventions despite their 11-point difference, and both earn exactly 3.3 GPA, not 3.12 and 3.56 as the formula would predict.

An 85% is a B on the standard plus/minus 4.0 scale, earning 3.0 GPA. The B range runs from 83-86% under the standard convention. Under a relaxed convention where B starts at 80% or a liberal convention, 85% is still a B at 3.0. Under a strict convention where B starts at 84%, 85% remains a B at 3.0. So across most common conventions, 85% reliably produces 3.0 GPA. On the simple scale without plus/minus, 85% is a B at 3.0 as well.

A 90% earns 3.7 GPA (A-) on the standard plus/minus scale where A starts at 93% and A- starts at 90%. On the simple scale, 90% is a full A worth 4.0 because there are no minus grades to distinguish within the A range. Under a strict convention where A- starts at 91%, a 90% is a B+ at 3.3. Under a relaxed convention where A- starts at 87%, a 90% is a full A at 4.0. The exact result depends significantly on which convention your school uses.

No. This formula is mathematically inaccurate for US GPA because it assumes a continuous linear relationship between percentage and GPA, but US GPA is based on discrete letter grade thresholds. Under the formula, 80% produces 3.2 and 89% produces 3.56, neither of which exists in any real US grading system. The correct values are 2.7 (B-) for 80% and 3.3 (B+) for 89% under the plus/minus scale. The formula was designed for converting international percentage grades and is frequently misapplied to US domestic grades by offshore websites.

A 95% earns 4.0 GPA (A) on all standard US scales. On the plus/minus scale, 95% falls in the A range (93-96%), which earns 4.0. On the 4.3 scale, 95% is still 4.0 because A+ requires 97% or above. On the simple scale, 95% is an A at 4.0. Under all four common grading conventions, 95% unambiguously earns a 4.0, making it one of the safest scores in terms of GPA outcome regardless of which convention your teacher uses.

A 3.5 GPA does not correspond to a single percentage because it falls between letter grade values on the plus/minus scale: B+ is 3.3 (87-89%) and A- is 3.7 (90-92%). A 3.5 GPA is a weighted average that combines different letter grades across multiple courses. In a single course, you cannot earn exactly 3.5 GPA because no letter grade has that value. The Reverse GPA section in this calculator shows you the percentage ranges that produce each specific GPA value. For 3.5, it would indicate that no single grade produces 3.5 exactly.

Different schools and professors set different percentage cutoffs for each letter grade. The most common threshold sets A at 90% or above, but many institutions use 91%, 93%, or even 94% for a full A. A student scoring exactly 90% earns 4.0 under a relaxed convention but 3.3 (B+) under a strict convention requiring 91% for even an A-. The convention comparison table in this tool shows your exact grade under all four major conventions simultaneously, so you can see how much variation to expect across different classroom policies.

Switch to Batch Entry mode, add a row for each course, enter the percentage and credit hours, and click Calculate GPA. The tool converts each percentage to a letter grade using your selected convention and scale, multiplies the grade points by credit hours to get quality points, and divides total quality points by total credit hours. This weighted average is your cumulative GPA. The batch tool supports up to fifteen courses and shows the letter grade, GPA, and quality points breakdown for every course entered.

A simple scale assigns whole numbers to five letter grades: A=4.0, B=3.0, C=2.0, D=1.0, F=0.0. Every percentage from 90-100% earns the same 4.0 and every percentage from 80-89% earns 3.0, regardless of where in that range you fall. A plus/minus scale introduces finer distinctions: A is split into A+ (4.0), A (4.0), and A- (3.7), and B into B+ (3.3), B (3.0), and B- (2.7). Most US colleges use the plus/minus scale, which produces more accurate cumulative GPA values that reflect true performance differences within the same letter grade band.

An 80% is 2.7 GPA (B-) on the standard plus/minus scale, since B- covers 80-82%. On the simple scale, 80% is a B worth 3.0. The difference between 2.7 and 3.0 for the same 80% score highlights how much the choice of scale affects GPA. Under a relaxed or liberal convention where B- starts at 77%, 80% earns a full B at 3.0. This is a boundary score where the convention choice matters significantly.

This calculator is designed for US domestic grading where percentage scores map directly to US letter grades. Using it for foreign percentage grades would produce incorrect results because international systems grade very differently. A UK 70% earns a First Class Honours degree, but under US thresholds it would be a C. If you are applying to a US institution from abroad, contact the admissions office for their official international grade equivalency process, which will use institution-specific conversion tables rather than a simple threshold system.

A 70% is 1.7 GPA (C-) on the standard plus/minus scale, since C- covers 70-72%. On the simple scale, 70% is a C worth 2.0. Under a strict convention where C- starts at 71%, a 70% falls into D+ territory at 1.3 GPA. A 70% is near the minimum passing threshold at most US institutions and is close to the point where some programs no longer count the course toward major requirements. Always check whether your major requires a minimum passing grade above the institutional minimum.

The threshold method used here is how US GPA is actually calculated, making it as accurate as knowing which convention your school and professor use. Select the convention that matches your syllabus and the results will match what your registrar would compute. The only source of inaccuracy is mismatching the convention: if your professor uses A = 91% and you have Standard (A = 90%) selected, a 90% will show as A- (3.7) in the calculator but appear as B+ (3.3) in your official gradebook. Always verify the specific thresholds from your course syllabus.

An A minus (A-) covers 90-92% under the standard plus/minus convention, 91-93% under the strict convention, and 88-89% under the relaxed convention. It earns 3.7 GPA on all plus/minus scales regardless of convention, since the GPA value for each letter grade is fixed once the grade is assigned. A- is 3.7 on both the 4.0 and 4.3 scales, and on the weighted 5.0 AP scale, A- earns 4.7. On the simple scale without plus/minus distinctions, an A- is treated the same as a plain A at 4.0.

The convention comparison table shows how your entered percentage maps to different letter grades and GPA values depending on which of four common US grading conventions applies. The four conventions differ in where they place the A threshold: Standard at 90%, Strict at 91-94%, Relaxed at 87-90%, Liberal at 85-88%. For most percentages in the solid middle of a letter grade range, all conventions produce the same result. For percentages near a letter grade boundary, the conventions diverge significantly. The highlighted row shows your currently selected convention.

On the standard plus/minus scale, 93% or above earns an A at 4.0. Scores from 90-92% earn only A- at 3.7. On the simple scale, 90% or above earns 4.0. Under a strict convention requiring 94% for A, you need at least 94% for a 4.0. On a relaxed convention where A starts at 90%, 90% is enough. This means the minimum percentage for a 4.0 depends on your school’s specific policy, ranging from 88-90% under liberal conventions to 93-94% under strict ones. Always check your syllabus.