GPA to Letter Grade Converter

Type a GPA value (4.0 or 5.0 scale) and read the matching letter grade and percentage band. Type a letter grade and the conversion runs the other way. Both directions support plus/minus modifiers (B+, A−, C+) and the corresponding decimal weights.

Useful when applying to schools that publish percentages while your transcript reports a 4.0 GPA, or when translating between US, UK, and IB grading conventions.

The defaults assume a US 4.0 unweighted scale. Switch the scale selector for weighted (5.0) high school GPAs, IB diploma points, or UK class-of-degree mappings — each has its own table.

The scales differ across systems and the conversions are not interchangeable. US 4.0 unweighted: A = 4.0, A− = 3.7, B+ = 3.3, B = 3.0, etc., down to F = 0. US 4.0 with plus/minus and weighted: caps at 5.0 for AP/IB courses (A in an AP class is 5.0; the same A in a regular class is 4.0). UK class of degree: First Class (≥70%), Upper Second 2:1 (60-69%), Lower Second 2:2 (50-59%), Third (40-49%), Pass (35-39%), Fail (<35%) — these don't map linearly to a 4.0 GPA. IB: 7-1 scale per subject, 45 max for the diploma, with thresholds for college equivalence that vary by institution.

Worked example. A US transcript shows GPA 3.7 unweighted on a 4.0 scale. The tool returns A− for the letter grade and roughly 90-92% for the percentage band. A UK applicant with a 65% average converts roughly to a 2:1, which most US grad schools treat as a 3.5-3.7 GPA equivalent — but each US school has its own conversion table, and the official one always wins. The tool's mappings are the consensus values used by ApplyTexas, Common App, and most credential evaluation services; they're a starting point, not a guarantee.

Where conversions get messy. Some US high schools weight AP classes by adding 1.0 to the unweighted grade (B in AP = 4.0 weighted, A in AP = 5.0 weighted). Others weight by adding 0.5. Others don't weight at all. Two students with identical 4.0 weighted GPAs from different schools may have done very different work. The tool offers both weighted and unweighted scales; pick the one your transcript actually uses, not the one you wish it used.

The IB to GPA conversion is similarly approximate. A 36/45 IB diploma is often treated as a 3.7 GPA equivalent, but the per-subject thresholds matter: 6 in HL Math is treated differently than 6 in HL Theatre by most engineering programs. The tool returns a global average; for application-specific equivalencies, check the target school's published conversion (every Russell Group university and every US Ivy publishes their own).