ATAR to IB Converter 2025
Enter either your IB Admissions Score (IBAS) / diploma score or a target ATAR and see the notional equivalent for the 2025 admissions cycle. (Banks on the latest public ACTAC table, rounded to two decimals.)
ATAR to IB Converter 2025
Australian Tertiary Admission Rank & International Baccalaureate
The straight-talk guide to turning your diploma score into the number Aussie unis actually care about
⚠️ IMPORTANT: Your IBAS always starts with your diploma score—38 becomes 38.xx, never 37.75 or 39.25. The pipeline's KPI is the ATAR (Australian Tertiary Admission Rank): a national percentile in 0.05-point slices, 99.95 → GOAT tier, 0.00 → bottom of the cohort.
Based on 2024/25 ACTAC conversion data
IB → ATAR conversion is just fancy statistics: IB Score → IBAS → percentile rank 🎯
2 Why the conversion exists
- Australian unis funnel every Year-12 lever—HSC, VCE, QCE and IB—into a single talent pipeline.
- The pipeline’s KPI is the ATAR (national percentile in 0.05-point slices).
- ACTAC (via QTAC/UAC/VTAC/TISC/SATAC) runs an annual IB → ATAR conversion routine to rank IB graduates.
3 2024/25 headline conversion bands
| IBAS / IB band | Notional ATAR |
|---|---|
| 45.75 – 45.50 | 99.95 |
| 45.25 | 99.85 |
| 45.00 | 99.75 |
| 44.25 – 44.50 | 99.40–99.50 |
| 43.00 | 98.75 |
| 41.00 | 97.05 |
| 39.00 | 95.00 |
| 36.00 | 91.00 |
| 33.00 | 86.30 |
| 30.00 | 80.05 |
| 27.00 | 72.65 |
| 24.00 | 65.75 |
Table above is a sample slice. The official PDF runs 45.75 → 0.00 in 0.25-point IBAS increments. Our calculator uses the full band map for higher resolution.
4 Worked example
Scenario: Diploma score = 38, subject grades sit just above band mid-points ➜ IBAS ≈ 38.50.
Conversion lookup → notional ATAR ≈ 94.55.
5 Caveats, quirks & sceptical takes
| Issue | Reality check |
|---|---|
| Tables shift yearly | Small cohort swings mean a 41.25 that ranked 98.65 in 2023 lands ~97.9 in 2025. |
| Uni-specific equivalence | Some unis publish simplified grids for minimum entry; selection ranks may sit higher. |
| Adjustment factors | Location/subject bonuses can add 1-10 points to your selection rank—ask each faculty. |
| Overseas IB candidates | Outside AU you’ll use the whole-number table (45 → 99.95, 24 → 67.35, etc.). |
6 Rapid-fire FAQ
| Q | A |
|---|---|
| IBAS vs diploma score? | IBAS = your diploma total (24-45) → two decimals after ACTAC fine-grains the rank (e.g. 38 → 38.62). |
| Can I convert ATAR back to IB? | Yes—select “ATAR → IB” in the tool and enter a rank. |
| Is 45 always 99.95? | Yes. Top slice is locked. Lower bands drift ~±0.10 each cycle. |
| How to lift ATAR quickly? | Small IB score bumps in the 38-41 zone shift ATAR by ~1–2 points—target marginal gains. |