IB Maths Grade Boundaries: What's a Good Score?

Grade boundaries are the raw-mark cutoffs the IB sets after each exam session, converting total scores out of 100 into grades 1-7. They aren't fixed numbers — for IB Maths AA and AI, a 7 usually sits around 75-85%, a 6 around 65-74%, and a 4 (the pass mark) around 40-45%, depending on the session.

Boundaries move because the IB uses criterion-referenced grading calibrated to exam difficulty, not a fixed percentage scale. If a paper is harder than usual, boundaries drop slightly to keep the proportion of 7s roughly consistent year on year — so the grade reflects your understanding, not the paper's difficulty.

A 7 in IB Maths typically needs roughly 75-85% of the total raw marks, depending on the course and session. AI courses have historically needed slightly higher percentages than AA for the same grade, because AI papers are generally seen as more accessible.

Yes — a 6 in IB Maths AA or AI, SL or HL, is a strong, competitive grade that most UK, European and many US universities treat as solidly above average. It typically needs around 65-75% depending on the course, and sits one band below top marks reserved for near-flawless scripts.

You need consistent accuracy across Paper 1 (non-calculator), Paper 2 (calculator) and Paper 3 (extended problem-solving), plus fluent command of proof, calculus and the option topic if your school teaches one. In fifteen years of teaching this, the students who get 7s aren't the fastest — they're the ones who never lose easy marks on method.

IB Maths papers are marked using method marks (M), accuracy marks (A) and, on some questions, marks awarded following through your own earlier error (R for reasoning, or FT). This means a wrong final answer can still score most of the marks if your working shows correct method — so always show it.

Your final IB Maths grade combines exam marks (80% of the total) with the Internal Assessment, called the Exploration (20%). Grade boundaries are set on the combined total out of 100, not on exams alone — so a weak Exploration mark can pull down an otherwise strong exam performance, and vice versa.

Neither is inherently easier — AI tends to demand more modelling and technology-based problem-solving with less pure calculus depth, while AA leans harder into abstract algebra and proof. Students who prefer applied, real-world context questions generally find AI grade boundaries slightly more forgiving; those strong in pure algebra often do better in AA.

For competitive courses like engineering, physics or economics at top universities, HL Maths is often expected or strongly preferred — many UK Russell Group and US STEM programmes list it explicitly. SL is perfectly fine for humanities, business or social science pathways, but check each university's subject requirements directly before choosing.

IB Maths, particularly AA HL, is consistently reported by teachers as having a slightly lower proportion of 7s than subjects like Biology or Business Management HL, reflecting its cognitive demand. This doesn't mean Maths is graded unfairly — it means fewer students master the top-band skills like rigorous proof and multi-step modelling under time pressure.

A grade 4 is generally considered a solid pass in IB Maths and typically requires around 40-45% of total marks, though the exact boundary is set per session. Remember your overall Diploma also needs 24 points across six subjects, plus core requirements, so one subject's grade isn't assessed in isolation.

Your school's DP coordinator has access to official past papers and the exact grade boundary documents released each session through IB's secure teacher portal — these aren't published publicly, so ask your coordinator directly if you want the precise figures for a past exam session.