IB Physics Score Calculator: How 174 Raw Marks Become a Grade From 1 to 7
Here's a number that surprises almost every IB student: in several published exam sessions, the grade 7 boundary for HL Physics has sat near 60% — one of the lowest top-grade cutoffs of any IB subject. Score 62 weighted percent and you can walk away with the same "7" that needs 80%+ in some language subjects. This IB Physics score calculator does the conversion the mark schemes never show you: it takes your raw marks from Paper 1A, Paper 1B, Paper 2, and the IA, applies the official 36/44/20 component weighting from the 2025 syllabus, and maps the weighted total onto grade boundary estimates for both HL and SL. The rest of this page unpacks each step of that pipeline, because two of them — weighting and boundaries — routinely move students a full grade away from what their raw average suggests.
Three Papers Became Two: The 2025 Assessment Model
If you've seen an older score calculator asking for a "Paper 3" mark, close the tab — it's weighting a paper that no longer exists. The syllabus first examined in May 2025 scrapped Paper 3 and the option topics with it. The experimental-skills questions it used to carry moved into Paper 1B, a data-based section stapled to the multiple-choice Paper 1A and sat in the same sitting. What remains is a clean three-component model:
| Component | HL marks | SL marks | Weight | What it tests |
|---|---|---|---|---|
| Paper 1A — multiple choice | 40 | 25 | 36% | Breadth across the whole syllabus, no penalty for guessing |
| Paper 1B — data-based | 20 | 20 | Graph reading, uncertainties, experimental analysis (ex-Paper 3 territory) | |
| Paper 2 — written response | 90 | 50 | 44% | Short and extended calculations and explanations |
| IA — scientific investigation | 24 | 24 | 20% | A ~10-hour independent investigation, teacher-marked then IB-moderated |
Notice the asymmetry: an HL candidate faces 174 raw marks in total, an SL candidate just 119, yet both funnel into the identical 1–7 scale with the identical 36/44/20 weighting. That difference in mark density is why HL and SL marks are worth different amounts per mark — the detail the next section turns into strategy.
The 36/44/20 Split: Why Raw Marks Lie
The IB doesn't add your marks together. It converts each component to a percentage, multiplies by the component's weight, and sums the three weighted pieces. Formally: final % = 36 × (P1/P1max) + 44 × (P2/P2max) + 20 × (IA/24). The consequence is that a mark is not a mark — its value depends entirely on which booklet it lives in:
| One mark gained on… | HL: moves final score by | SL: moves final score by |
|---|---|---|
| Paper 1 (1A or 1B) | 36/60 = 0.60% | 36/45 = 0.80% |
| Paper 2 | 44/90 = 0.49% | 44/50 = 0.88% |
| IA | 20/24 = 0.83% | 20/24 = 0.83% |
Read the HL column twice, because it's counterintuitive: the heaviest component (Paper 2, 44%) has the lightestmarks, at 0.49% each, simply because there are 90 of them. An HL IA mark is worth 70% more than a Paper 2 mark. So when you're deciding whether to spend a weekend polishing your IA draft or grinding another past Paper 2, the exchange rate says the IA — recovering 3 IA marks buys you 2.5 percentage points, which takes roughly 5 Paper 2 marks to match. At SL the table flips: Paper 2 marks are the most valuable, at 0.88% apiece, because SL squeezes the same 44% weight into a 50-mark paper.
Worked Example: 107 Raw Marks — a 6 or a 7?
Take an HL candidate with 27/40 on Paper 1A, 12/20 on Paper 1B, 51/90 on Paper 2, and 17/24 on the IA — the calculator's default values. Raw total: 107 of 174 marks, or 61.5%. Against a typical 62% boundary for a 7, that raw figure says "6, just barely." Now do it properly:
- Paper 1: 39/60 = 65.0% → × 36 = 23.4 points
- Paper 2: 51/90 = 56.7% → × 44 = 24.9 points
- IA: 17/24 = 70.8% → × 20 = 14.2 points
Weighted total: 62.5%— a full point above the raw calculation, and now sitting on the other side of the 62% line. A grade 7, from the exact same marks. The whole shift comes from the weighting: this student's two strongest components (Paper 1 and the IA) happen to be the ones with the heaviest per-mark value, so the weighted average leans toward them. It works in reverse too — a candidate who banks marks mostly on the 90-mark Paper 2 will see their weighted total land below their raw percentage. If you only remember one thing from this page: never predict your IB Physics grade from a raw-mark percentage.
Why 60% Can Earn a 7 (and Why That's Not a Scandal)
IB boundaries aren't fixed like a school test's 90/80/70 letter scale. After each session, senior examiners hold a grade award meeting where they compare the papers' actual difficulty against previous years, review samples of student work at each candidate mark, and set the cutoffs so that a grade 7 means the same standard of physics regardless of how brutal that year's Paper 2 was. Physics boundaries end up low because the papers are genuinely hard to score on — extended-response questions award marks for intermediate steps that most candidates drop. A 62% in HL Physics represents roughly the same command of the subject as an 80% in a subject with generous mark schemes. That's the logic; the official IB assessment guide describes the criterion-referenced process in detail.
For you, the practical takeaway is that boundaries float. Across recent published sessions the HL 7 cutoff has ranged from about 58% to 66% — an 8-point spread, wider than most students' mock-to-final improvement. Not every exam system works this way: New York's Regents exams fix their raw-to-scaled conversion before anyone sits the paper, as the Physics Regents score calculator explains — the IB's after-the-fact approach trades that predictability for tighter standard-setting. That's why this calculator ships three boundary scenarios instead of one false-precision table. Run your marks through all three: a prediction that says "7" under strict boundaries is bankable, while one that says "7" only under the generous set is really a coin-flip 6/7.
HL and SL Boundaries Aren't Interchangeable
A persistent myth in IB forums is that SL grades are easier to get because the content is lighter. The content is lighter — the boundaries compensate. SL Physics cutoffs typically run 1–3 percentage points higherthan HL's in the same session: where HL might award a 7 from 62%, SL demands 64%. Two effects drive this. SL papers contain fewer of the multi-step derivation questions that bleed marks at HL, so strong candidates lose less along the way. And the SL cohort includes students who chose SL specifically to protect their diploma score, compressing the top of the distribution. The result: a borderline candidate can genuinely face an easier route to a 7 at HL than at SL — something worth knowing before you drop down a level in your final year expecting free points.
The IA: 24 Marks You Bank Before Exam Week
The scientific investigation is the only component you complete with unlimited time, full access to your notes, and a teacher available for one round of feedback — and at HL its marks are the most valuable on the entire assessment, at 0.83% each. A 20/24 IA walks into exam week carrying 16.7 of the 62 points a typical 7 requires; an 11/24 IA carries 9.2. That 7.5-point difference is the same as 15 Paper 2 marks — roughly two entire extended-response questions — decided months before you open an exam booklet.
One caution before you plug your teacher's IA mark into the calculator: it isn't final. The IB moderates a sample from each school, and if the sample suggests over-generous marking, every IA in the class scales down together — a 2–3 mark haircut is common enough that experienced coordinators warn about it. Three IA marks is 2.5 percentage points, exactly the kind of margin that flips the borderline worked example above from a 7 back to a 6. If your school's physics IAs have a history of moderation, run the calculator once with the predicted mark and once with 2–3 marks shaved off.
IB 7 or AP 5? Reading Your Score Across Systems
Students applying to US universities usually hold both currencies, so here's the exchange rate. The systems are built differently — AP compresses everything into a 1–5 from a single exam day, while IB blends two exam papers with coursework — but admissions offices treat the top bands as roughly equivalent:
| Dimension | IB Physics (HL) | AP Physics |
|---|---|---|
| Scale | 1–7, boundaries reset every session | 1–5, cutoffs adjusted per exam form |
| Coursework counted | Yes — IA is 20% of the grade | No — 100% exam |
| Top-grade rate | Roughly 20–25% earn a 7 at HL | About 8% earn a 5 on AP Physics 1 |
| Typical credit line | HL 5–7 (SL often earns nothing) | Usually 4–5, sometimes 3 |
The top-grade rates look lopsided until you remember selection bias: nearly everyone in HL Physics chose a hard subject on purpose, while AP Physics 1 is many US students' first physics course — its pass rate hovers near 50%, as the AP Physics 1 score calculator breaks down. If you're comparing against the calculus-based track instead, the AP Physics C score calculator is the fairer match for HL — similar cohort, similar depth, and a notably higher 5 rate than Physics 1.
Where This Prediction Can Miss
A score calculator is an estimator, and it's honest to say where the estimate is soft. Three failure modes cover almost every miss. First, boundary drift: the ±4-point spread between this calculator's generous and strict scenarios reflects real session-to-session movement, so any weighted total within about 2 points of a cutoff is genuinely undecided — the borderline badge exists for exactly that case. Second, IA moderation, which can move your largest-per-mark component after the fact. Third, self-scored papers: students marking their own Paper 2 practice runs tend to over-award method marks by 5–10% because mark schemes give credit in ways that are hard to judge on your own work — if your inputs come from self-marked mocks, knock a few marks off Paper 2 before trusting the prediction. What the calculator will never mispredict is the arithmetic itself: the 36/44/20 weighting is fixed in the subject guide, and that part of your grade is pure, checkable math.
