If you’re trying to understand your IB to GPA conversion before applying to US universities, the most important thing to know upfront is this: there is no single, official, universally mandated IB-to-GPA conversion table. Each university that chooses to convert your IB grades into a GPA-equivalent figure typically uses its own internal methodology — which is exactly why different online calculators sometimes give you noticeably different answers.
If you’re applying to the UK as well, see our companion guide on IB to UCAS points conversion.
Why This Confuses So Many Students and Parents
The IB grades each subject on a 1-7 scale, while the US system typically uses a 0.0-4.0 GPA scale — two fundamentally different systems built around different philosophies of assessment. Because the IB Organization itself doesn’t publish a mandatory conversion table, individual universities and third-party tools have each developed their own approximate mapping, generally without full agreement between them.
A Common (But Not Universal) Conversion Pattern
While it varies by institution, a commonly used unweighted conversion pattern maps roughly as follows: a 7 often converts to approximately 4.0, a 6 to somewhere around 3.7-3.9, a 5 to roughly 3.0-3.3, decreasing further at each grade below that. Some universities use a more compressed scale, where a 6 also converts to a full 4.0, reflecting a more generous interpretation of strong IB performance. Always check your specific target university’s own published conversion methodology, or contact their admissions office directly, rather than relying on a single generic table for an important application decision.
Weighted vs Unweighted GPA: An Important Distinction
Many US high schools award a weighted GPA bonus for genuinely advanced coursework (AP, Honours, and IB courses), commonly adding an additional 0.5 to 1.0 points for Higher Level IB subjects specifically, reflecting their greater rigor compared to Standard Level courses. This means the same IB grade can convert to a different final GPA figure depending on whether a weighted or unweighted methodology is used — and depending on whether HL and SL subjects are weighted the same or differently by a given institution.
Do Universities Convert Your Whole Diploma Score, or Each Subject?
Most conversion methodologies work at the individual subject level — converting each of your six subject grades separately, then averaging — rather than converting your single total diploma score (out of 45) directly into one GPA figure. This distinction matters: a diploma total that includes several TOK/EE bonus points isn’t meant to be converted as if those bonus points were part of your subject-level GPA calculation.
This distinction also matters if you’re weighing the Diploma against individual certificates — see our guide on IB Diploma vs Certificate: what US colleges prefer.
A Worked Example
A student with subject grades of 7, 6, 6, 6, 6, 6 (36 subject points before any TOK/EE bonus) might convert, under a common unweighted scale, to an estimated GPA in the high 3.8-3.9 range — though the exact figure depends entirely on which specific conversion table is applied.
Why Many Universities Don’t Rely Heavily on GPA Conversion Anyway
Because US admissions officers at universities with meaningful international applicant experience are generally already familiar with how the IB curriculum works, many rely more on your original IB grades, your school’s context, and your overall application narrative than on a converted GPA figure — the conversion is often used more as a rough comparison tool than as the central number driving an admissions decision, particularly at universities with substantial IB applicant history.
How to Get an Accurate Answer for Your Target Universities
- Check whether your target university publishes its own specific IB conversion methodology (often on the international admissions or registrar page)
- If nothing is published, contact the admissions office directly and ask specifically how they evaluate IB Diploma results
- Present your original IB grades clearly and accurately in your application regardless, since this is the primary information admissions officers are trained to interpret
Final Tip
Don’t over-invest time trying to calculate a “perfect” GPA conversion for every target university — focus that energy instead on making sure your original IB grades, HL subject choices, and overall academic story are presented as clearly and strongly as possible, since this is what most admissions officers actually rely on most heavily.
Conversion methodologies vary by institution and are not standardized — always verify your specific target university’s approach directly rather than relying on a single generic conversion table.