IB grade boundaries calculator

Use this IB grade boundaries calculator to search past IB grade boundaries by subject, session, level, and timezone. Enter expected Paper 1, Paper 2, Paper 3, IA, oral, or coursework scores and the calculator converts them into an estimated scaled mark against the selected boundary table.

How the IB grade boundaries calculator works

IB grade boundaries are the minimum scaled marks needed for each grade from 1 to 7. The calculator searches stored boundary tables by session, subject, level, and timezone, then compares your estimated scaled mark with the selected boundary.

Key Concepts

• TZ0 (Worldwide): Used for subjects with a single paper set globally (e.g. Visual Arts, TOK).
• TZ1 (Americas): North and South America.
• TZ2 (Europe, Africa, Asia Pacific).

How to use the IB grade calculator

1. Select a session: pick from May or November, covering 2017 to 2025.
2. Search for your subject: type in the search box. You can include the level (HL / SL) and timezone (TZ1, TZ2) to narrow results.
3. Enter component scores: add the percentage you expect for Paper 1, Paper 2, Paper 3 where relevant, IA, oral, or coursework.
4. Adjust weights if needed: the tool starts with a planning preset, but you can change weights if your subject guide or coordinator confirms a different component structure.

Tips for accurate calculator results

• Use the closest matching session, level, and timezone; do not assume May, November, TZ1, and TZ2 behave the same.
• Check the syllabus year before relying on a component split, especially for subjects that recently changed assessment structure.
• Component presets are editable. If your retake uses an older syllabus, an IA carry-forward, or a school-specific confirmation, change the weights before reading the result.