The 4.0, 4.33, and 5.0 GPA Scales Explained

If you have ever stared at a transcript and wondered why your GPA is on a different scale than your sibling\u2019s, the answer is that there is no single American GPA scale. There are three common ones — 4.0, 4.33, and 5.0 — and they each exist for a reason.

The 4.0 scale (the standard)

The original and most widespread. Every grade caps at 4.0:

• A+ → 4.0
• A → 4.0
• A- → 3.7
• B+ → 3.3
• … down to F → 0.0

Note that A and A+ are both 4.0 — the "+" is recognized on the transcript but does not earn extra GPA points. This is the most common university scale and the de-facto international standard for graduate-school comparison.

The 4.33 scale (perfectionists rewarded)

A small but vocal minority of schools — including most Canadian universities and a few US graduate programs — use the 4.33 scale, which awards extra credit for A+:

• A+ → 4.33
• A → 4.0
• A- → 3.67
• B+ → 3.33
• … down to F → 0.0

The math advantage is small (you would need many A+s to push your GPA above 4.0), but the philosophical difference matters: the 4.33 scale acknowledges that a 99 is meaningfully better than a 93. When reporting a 4.33 GPA on an application designed for 4.0, list both your raw value and a note about your school\u2019s scale.

The 5.0 scale (weighted high school)

The 5.0 scale is unique to US high schools and exists exclusively for weighted GPAs. The base values match the 4.0 scale, then bonuses are added for harder courses:

• Regular A → 4.0
• Honors A → 4.5 (+0.5 boost)
• AP / IB / dual-enrollment A → 5.0 (+1.0 boost)

The result is that a high schooler can have a weighted GPA above 4.0 while their unweighted GPA is below 4.0. This is normal, expected, and what selective colleges look at when assessing course rigor.

Less common scales

• 5.5 / 6.0 scales — A handful of competitive high schools use these to give extra credit for "advanced" or "post-AP" coursework. Add an extra +0.5 or +1.0 on top of the standard +1.0.
• 10-point CGPA — The Indian higher-education standard. Conversion: US GPA ≈ CGPA / 2.5.
• 1.0–5.0 (German) — Inverted: 1.0 is best, 5.0 is fail. Approximate conversion: German ≈ 5 − US GPA × (4/4).
• UK Honours bands — First (1st), Upper Second (2:1), Lower Second (2:2), Third, Pass — not a numeric scale at all, but a categorical one.

How to read a transcript with mixed scales

Look at the school profile attached to the transcript. Every accredited US high school produces one, and it explains the scale used and the weighting conventions. The Common App and Coalition Application require this profile, so admissions officers will always have the context. Without the profile, a "4.6 GPA" is genuinely ambiguous.

How our calculators handle different scales

The default scale on every calculator on this site is the standard 4.0. The Weighted GPA Calculator applies +0.5 / +1.0 boosts for the standard 5.0 scale. The Multi-Scale Comparison Tool converts between US 4.0, UK Honours, German, Indian CGPA, Chinese 5.0, and Australian 7-point. The Scale Converter handles letter ↔ percentage ↔ points within the 4.0 system.