Searching for a definitive IB vs A-Level equivalence table is a common instinct, but the most accurate answer is similar to what we found with UCAS Tariff conversion: there’s no single official table that universities universally apply, because the two qualifications are structured too differently to convert with perfect precision.
Why These Two Qualifications Don’t Convert Cleanly
A-Levels typically involve three (sometimes four) subjects studied in depth, each graded A* to E. The IB Diploma involves six subjects across a broader range of disciplines, plus TOK, the Extended Essay, and CAS, with a combined score out of 45. Because the underlying structure — number of subjects, depth versus breadth, the presence of the core components — differs so fundamentally, any single conversion table is necessarily an approximation, not a precise mathematical equivalence.
A Commonly Referenced General Comparison
While not official, a frequently used rough reference point treats an IB score in the high 30s to low 40s as broadly comparable to three A* grades at A-Level, with a score in the low-to-mid 30s roughly comparable to a mix of A and A* grades, and so on descending through the ranges. Universities that accept both qualifications (particularly in the UK) generally publish separate, specific requirements for each — an IB point total for IB applicants and a specific A-Level grade combination for A-Level applicants — rather than asking you to convert between them yourself.
Why This Matters: You Rarely Need to Convert It Yourself
Since UK universities publish IB and A-Level requirements separately for the same course, your actual task is simpler than finding a universal conversion — you just need your specific target course’s published IB requirement, not a converted equivalent of its A-Level requirement (see our guide on IB requirements for US universities).
When a Rough Comparison Is Genuinely Useful
A general sense of equivalence is mainly useful in informal contexts — understanding roughly how your profile compares to A-Level peers, or explaining your qualification to someone more familiar with A-Levels (a family member, a school considering which system to offer). It’s not something you should rely on for an actual application decision, where the specific published IB requirement for your course is always the number that matters.
How the Two Systems Compare Structurally, Beyond Just Grades
Breadth vs depth — the IB’s six-subject structure, including subjects outside your main academic focus, is often described as broader but less deep in any single subject compared to A-Level’s typically narrower, more specialized three-subject structure.
The core components — TOK, the Extended Essay, and CAS have no direct A-Level equivalent, and some universities specifically value the skills these develop (independent research, critical thinking, sustained commitment) as part of why they view the IB favorably, beyond just the subject grades themselves.
What Admissions Officers Actually Think About This Comparison
Admissions staff at universities that accept both qualifications are generally well-versed in evaluating each on its own terms, rather than mentally converting one into the other — this is part of why published, qualification-specific requirements exist in the first place, removing the need for informal equivalence tables in real admissions decisions.
Final Tip
If you’re choosing between pursuing the IB or A-Levels and comparing the two feels genuinely useful for that decision, focus less on a numeric equivalence table and more on which structure — the IB’s breadth-plus-core approach, or A-Level’s depth-focused specialization — actually fits how you like to learn and what you want your profile to demonstrate.
There is no single official IB-to-A-Level conversion recognized universally — always check a specific university’s published IB requirement directly rather than relying on an informal equivalence.