IB to Percentage Converter - IB Grades to Percentage Equivalents
Convert IB Diploma subject grades (1-7) and total diploma scores (24-45) to percentage equivalents. Includes full conversion tables for subject grades and total scores, HL/SL context, worked examples, and guidance for application forms requiring percentage values.
IB 7 corresponds to roughly 80-100%, with 88% used as the practical midpoint
IB 4 is the satisfactory band, commonly mapped near 50-59%
IB Diploma minimum 24 points is approximately 53.3% by total-score proportion
IB grades are reported on a 1-7 scale per subject, not as percentages. This page uses grade-band midpoint conversion so you can report defensible percentage equivalents for both subject outcomes and total diploma score.
IB Subject Grade to Percentage Conversion Table
IB subject grades correspond to session-dependent boundaries. The table below uses approximate bands and midpoint values for transparent self-reporting and form conversion.
| IB Grade | IB Descriptor | Approx % Band | Midpoint % | GPA (4.0) | A-Level Equivalent | A-Level UMS % | UK Classification |
|---|---|---|---|---|---|---|---|
| 7 | Excellent | 80-100% | 88% | 4.0 | A* | 90-100% | First Class (Distinction) |
| 6 | Very Good | 65-79% | 73% | 3.7 | A | 80-89% | First Class |
| 5 | Good | 55-64% | 60% | 3.3 | B | 70-79% | Upper Second (2:1) |
| 4 | Satisfactory | 45-54% | 52% | 3.0 | C | 60-69% | Lower Second (2:2) |
| 3 | Mediocre | 35-44% | 40% | 2.3 | D | 50-59% | Third Class |
| 2 | Poor | 20-34% | 28% | 1.7 | E | 40-49% | Fail (below minimum) |
| 1 | Very Poor | 0-29% | 15% | 1.0 | U | 0-39% | Fail |
IB Diploma Total Score to Percentage Conversion Table
Total-score conversion uses percentage = (IB score / 45) x 100. This expresses overall diploma performance as a proportion of the maximum available score.
| IB Score | % (÷45 method) | GPA (4.0) | UCAS Points | Classification | University Context |
|---|---|---|---|---|---|
| 45 | 100.0% | 4.00 | 768 | Outstanding - maximum diploma | Ivy League / Oxbridge competitive |
| 44 | 97.8% | 4.00 | 752 | Outstanding | Ivy League / Oxbridge competitive |
| 43 | 95.6% | 3.97 | 736 | Exceptional | Top 10 global universities |
| 42 | 93.3% | 3.93 | 720 | Exceptional | Top 10-25 globally |
| 41 | 91.1% | 3.90 | 704 | Excellent | Top 25 globally |
| 40 | 88.9% | 3.87 | 688 | Excellent | Top 25 globally |
| 39 | 86.7% | 3.83 | 672 | Very Good | Top 25-50 globally |
| 38 | 84.4% | 3.80 | 656 | Very Good | Top 25-50 globally |
| 37 | 82.2% | 3.77 | 640 | Very Good | Top 50 globally |
| 36 | 80.0% | 3.73 | 624 | Good | Top 50-75 globally |
| 35 | 77.8% | 3.70 | 608 | Good | Top 50-75 globally |
| 34 | 75.6% | 3.67 | 592 | Good | Top 75-100 globally |
| 33 | 73.3% | 3.63 | 576 | Satisfactory | Top 100 / competitive regional |
| 32 | 71.1% | 3.60 | 560 | Satisfactory | Regional universities |
| 30 | 66.7% | 3.53 | 528 | Satisfactory | Standard university entry |
| 28 | 62.2% | 3.47 | 496 | Minimum standard | Most universities |
| 24 | 53.3% | 3.33 | 280 | Diploma minimum | Limited selective options |
Why IB Subject Grades Are Not Directly Equivalent to Percentages
The 1-7 scale is qualitative: IB grades are criterion-referenced descriptors, not direct percentage scores.
Boundaries vary by session: Grade cutoffs are adjusted by subject and exam session based on cohort outcomes and moderation.
Midpoint conversion is practical: Midpoints provide a conservative and transparent estimate for forms that require percentages.
Official boundary documentation exists: Schools and coordinators can access boundary documents for exact session interpretation.
Application transparency matters: Always note that percentage figures are converted midpoint estimates unless raw marks are available.
IB Percentage Equivalents Compared to Other Grading Systems
| IB Grade | IB % Midpoint | A-Level Equiv | A-Level UMS % | GPA (4.0) | Australian Grade | Australian % | Canadian % (Ontario) |
|---|---|---|---|---|---|---|---|
| 7 | 88% | A* | 90-100% | 4.0 | HD | 85-100% | 90-100% |
| 6 | 73% | A | 80-89% | 3.7 | D | 75-84% | 80-89% |
| 5 | 60% | B | 70-79% | 3.3 | C | 65-74% | 70-79% |
| 4 | 52% | C | 60-69% | 3.0 | P | 50-64% | 60-69% |
| 3 | 40% | D | 50-59% | 2.3 | P borderline | 45-54% | 50-59% |
| 2 | 28% | E | 40-49% | 1.7 | F | Below 50% | 40-49% |
| 1 | 15% | U | 0-39% | 1.0 | F | Below 45% | Below 40% |
IB Percentage Classification Bands
| Percentage Band | Classification | Typical IB Profile | UCAS Benchmark |
|---|---|---|---|
| 85-100% | Outstanding / Excellent | IB 7 dominant | IB 38-45 (UCAS 640-768) |
| 70-84% | Very Good | IB 6 dominant | IB 32-37 (UCAS 544-624) |
| 55-69% | Good | IB 5 dominant | IB 25-31 (UCAS 448-528) |
| 45-54% | Satisfactory | IB 4 level | IB 24 (UCAS 280) |
| 35-44% | Below Satisfactory | IB 3 level | Below standard |
| 20-34% | Poor | IB 2 level | Low benchmark |
| Below 20% | Very Poor | IB 1 level | Fail-equivalent |
Worked Examples: IB to Percentage Conversion
Grades 7, 6, 6, 6, 5, 5 convert to 88, 73, 73, 73, 60, 60 for a subject-average of 71.2%.
Total score conversion gives 86.7% (39/45). Report the method clearly because these represent different interpretations.
IB Mathematics HL grade 7 maps to midpoint 88% and aligns with 4.0 GPA plus A-Level A* qualitative equivalence.
Use midpoint reporting when exact raw-mark boundaries are unavailable.
A six-subject all-6 profile gives 73% subject midpoint average but 86.7% by total-score proportion (39/45).
Always confirm which method scholarship criteria accept before concluding eligibility.
IB HL 6 (73%), IB SL 5 (60%), and A-Level A midpoint (84.5%) average to 72.5% combined context.
Include a short methodology note so the reviewer can interpret mixed qualification percentages properly.
When Do You Need to Convert IB Grades to a Percentage?
Related Conversion Paths
Use IB to GPA converter and IB and A-Level to GPA calculator for GPA-focused comparison.
For tariff context, use IB to UCAS Points and the UCAS Tariff Table.
Compare with A-Level to Percentage, A-Level to GPA, and the A-Level to Australian ATAR.
For broader conversion workflow, use the percentage grade calculator and GPA scale guide.