IB Score Calculator
The formula
What the ib subject sum tells you
The six-subject 7-point sum before the TOK/extended-essay core — the bulk of the 45-point IB total.
Calculation: Subject total = sum of six 1–7 grades; core adds 0–3. Enter your inputs and every substitution is shown below the result.
Reading the result
Every subject is one of seven rungs; three at HL, three at SL, and the core is its own matrix award.
Rules of thumb: 38+ points = typical competitive zone; global mean ~30
Limitations and best practice
The core is a matrix, not arithmetic: TOK and EE grades combine to 0–3 by rule.
This calculator gives an estimate based on standard formulas; it is not professional financial, medical, legal or engineering advice. Verify anything you plan to act on with a qualified professional and your own records.
Frequently asked questions
Can you pass with 24 and a 3?
Does IB count for college credit?
Source & methodology
IB Diploma grading guide.
IB Score explained: formula, worked example and honest limits
You want to know what the number requires, not just what it is; this page shows both. Searchers land on an IB Score page for three reasons — to plan, to compare options, and to check that somebody else’s arithmetic is honest. This tool serves all three, and everything after the calculator explains the model instead of hiding it.
Most confusion about IB Score comes from mixing up the input you control with the input you merely observe. The formula treats them identically, but your decisions should not: one deserves measurement, the other deserves a defensible estimate.
People rarely disagree about arithmetic; they disagree about assumptions that were never written down. Printing the substitution and the sensitivity ranking removes that category of disagreement for IB Score.
Every figure in the prose is generated by the engine rather than written beside it — the worked example resolves to subject total = 34 on the default inputs, and the sensitivity section ranks the inputs that move the result — Group 2 first, at ≈1.8 % of the headline for a ten-percent error either way in that input. Read the sections in order and you will be able to reproduce every figure by hand.
The IB Score formula, explained
The engine implements a single stated model: Subject total = sum of six 1–7 grades; core adds 0–3. There is no hidden coefficient and no login-gated precision — the formula printed is the formula executed, which is also what makes the result citable.
Group 1 (example value 5) is a measured number in the unit named by the label; the formula does not convert for you. If you are unsure what belongs in this field, look at the printed steps: the substitution shows exactly how the engine uses it.
Group 2 (example value 6) is a numeric input whose unit is fixed by the label; a wrong unit is a wrong answer wearing a plausible disguise. Replace the example with the figure from your own records — the tool recomputes instantly and the printed steps follow your numbers.
Group 3 (example value 6) is a quantity rather than a category — precision here is cheap and worth having. The example value is there to demonstrate the mechanics, not to describe your situation — overwrite it.
Group 4 (example value 6) is a plain measured quantity — the unit shown in the label is the unit the formula expects. Replace the example with the figure from your own records — the tool recomputes instantly and the printed steps follow your numbers.
Group 5 (example value 6) is a quantity rather than a category — precision here is cheap and worth having. This input feeds the formula directly; a defensible figure here is worth more than false precision anywhere else.
Sixth elective (example value 5) is a numeric input whose unit is fixed by the label; a wrong unit is a wrong answer wearing a plausible disguise. This input feeds the formula directly; a defensible figure here is worth more than false precision anywhere else.
A fully worked IB Score example
Abstract formulas are hard to trust, so here is the complete substitution using the default inputs, written the way an examiner would want it. Starting figures: Group 1, Group 2, Group 3, Group 4. The endpoint of that chain is 34 of subject total, sitting in the “Six subjects at these grades put 34 on the board; with a typical core award (2) the projection is 36 — one step above the 24-point diploma floor and below the 38 scholarship line” band.
- Sum of six grades = 34
- Core bonus band 0–3; typical 2
- Projection 36 of 45
Core (typical) — 2. Read next to the headline, this is the figure that shows the shape of the trade-off.
Projected total — 36. This is the number experienced users quote when the headline alone would mislead.
Diploma floor — 24. This is the number experienced users quote when the headline alone would mislead.
Top-university zone — below typical 38+ band. This is the number experienced users quote when the headline alone would mislead.
Overwrite any input above and every line of this example updates with it — the substitution is live, not a screenshot of somebody else’s numbers.
How far IB Score can reasonably move
The honest version of any estimate is a corridor, and this one is cheap to produce: IB Score was recomputed at 5 points along the dominant input, with every other field left untouched.
| Group 2 setting | Subject total |
|---|---|
| 80 % of the example value | 33 |
| 90 % of the example value | 33 |
| example inputs | 34 |
| 110 % of the example value | 35 |
| 120 % of the example value | 35 |
That spread — 33 at the low end, 35 at the high — is what a careful read of IB Score looks like: a band you can state out loud, with the reason for each edge. Reproduce it in the form above by editing Group 2 alone; the substitution steps will follow your figures exactly.
Where IB Score is fragile — and where it is not
Generic advice says “it depends on your inputs”; this section says exactly how much. Each field was perturbed by ±10 % in isolation and the subject total recomputed, so the ranking below is measured rather than asserted. Read it as a map of where IB Score is fragile — drawn for the example inputs, which is the map you want when deciding what to measure carefully.
- Group 2: ten percent up gives 35, ten percent down gives 33 — ≈1.8 % of the subject total either way
- Group 3 +10 % → IB Score = 35 · −10 % → 33 (the subject total shifts ≈1.8 %)
- Group 4: ten percent up gives 35, ten percent down gives 33 — ≈1.8 % of the subject total either way
- Group 5: ten percent up gives 35, ten percent down gives 33 — ≈1.8 % of the subject total either way
- Group 1 +10 % → IB Score = 35 · −10 % → 34 (the subject total shifts ≈1.5 %)
- Sixth elective: ten percent up gives 35, ten percent down gives 34 — ≈1.5 % of the subject total either way
Group 2 is the dominant lever here: ten percent either way moves the result by about 1.8 %, from 33 to 35. Spend your verification effort there first, and Group 3 is effectively tied with it (≈1.8 % for the same nudge), so verify the pair together. Everything below that can stay approximate, which is a licence to stop chasing data that would not change the decision.
What an IB Score of 34 means in practice
Nobody acts on a bare figure — they act on a figure with a comparison attached. On the example inputs the band reads “Six subjects at these grades put 34 on the board; with a typical core award (2) the projection is 36 — one step above the 24-point diploma floor and below the 38 scholarship line”; your own figures place you on a different rung of the same ladder. The sensitivity list shows how far a modest input error moves you along that ladder: for Group 2, ±10 % covers 33 to 35. The practical reading rules: compare against your own history before comparing against other people; treat band boundaries as zones, not walls — one point on the wrong side of a threshold rarely changes a real outcome; and when a companion output contradicts the headline, believe the pair.
The comparison worth making is not with somebody else’s IB Score but with the version of your own situation measured last quarter — same formula, same conventions, different inputs.
How people get IB Score wrong
The core is a matrix, not arithmetic: TOK and EE grades combine to 0–3 by rule. This calculator gives an estimate based on standard formulas; it is not professional financial, medical, legal or engineering advice. Verify anything you plan to act on with a qualified professional and your own records.
Reporting the headline and quietly discarding Core (typical). The companions are where the shape of the trade-off survives the rounding.
Attention is also misallocated between fields. Having measured this engine, we can say where it belongs: Group 2 first, everything else second.
Another is comparing across contexts: an IB Score computed with one set of conventions should never be lined up against a figure computed with another. Check the inputs behind both before ranking them.
Six things to confirm before acting on IB Score
- Check that every field the formula needs actually arrived from a document, not from recollection.
- State, in one sentence, which convention each rate, unit or period in the form is using.
- Re-verify Group 2 against a source document — ten percent of error there moves the headline by ≈1.8 %.
- Cross-check any figure used in an application against the official source for the same cycle.
- Re-run the calculation with a ±10 % stress on the two most sensitive inputs.
- Repeat the ±10 % test on the inputs that matter and see whether the decision — not just the number — still holds.
A routine for decision-grade IB Score
Using a calculator well sounds trivial, but the difference between a decision-grade figure and a throwaway one lives entirely in the routine. The routine for IB Score takes a minute to learn and applies to every input above.
Step 1 — one document, one pass. Open the statement, label or record that holds group 1, group 2, group 3, group 4, group 5, sixth elective and transcribe straight into the form. Transcription from a single source removes the mismatch errors that appear when figures are assembled from three different places. Repeating a calculation with the same numbers proves only that the arithmetic is reliable — which is worth knowing.
Step 2 — start from the case you can defend. Enter pessimistic-but-honest figures first; the optimistic run is a ceiling, not a plan. A conclusion that holds on conservative inputs holds everywhere. A figure with a date beside it becomes evidence; without one it stays an anecdote.
Step 3 — change one input at a time. Nudge a single field by ten percent, watch the headline and its companions move, then undo it. Two or three fields will dominate — the sensitivity table above already ranks them for this engine. Rounding early is the quietest way to introduce a permanent error.
Step 4 — run the scenario trio. Expected, pessimistic, optimistic. The gap between pessimistic and expected is the number to plan against; the optimistic result is useful only as a ceiling. Numbers are cheap to produce and expensive to retract; the extra minute is the cheapest insurance available.
Step 5 — save the story with the figure. A number without its inputs and its date is unusable within a quarter. Record 34, the assumptions behind it, and today’s date; your future self will be auditing a stranger’s arithmetic. Rounding early is the quietest way to introduce a permanent error.
From calculation to decision: where IB Score earns its keep
Education & Academics arguments end at arithmetic or they do not end. IB Score is the arithmetic: 34 on the example inputs, reproducible by anyone who types the same numbers. A calculation you cannot explain to somebody else is a calculation you cannot defend.
The companion outputs — Core (typical) and Projected total — exist for the second stage of that screen: the headline sizes the prize, while the companions describe the trade-off you are accepting to get it. Precision is a promise you make about your data; make sure your inputs can keep it.
Nothing here is stored or transmitted, so the habit of checking is free: open the page, re-enter current figures, compare with the number you saved last time. If the answer changes your behaviour, it deserves a second run with different assumptions.
IB Score — frequently asked questions
What affects IB Score the most?
IB Score is driven above all by Group 2. Perturbing only that field by ten percent either way produced 35 against the 34 baseline — a ≈1.8 % response, while Group 3 manages ≈1.8 %.
Do group 3 and group 2 matter equally?
Effectively. Measured on this engine they land at ≈1.8 % and ≈1.8 % for the same ten-percent nudge, so the honest advice is to get both right; chasing precision in only one of them buys almost nothing.
What is a typical IB Score?
There is no honest universal average for IB Score, but there is a reference point: the defaults on this page produce 34 (Six subjects at these grades put 34 on the board; with a typical core award (2) the projection is 36 — one step above the 24-point diploma floor and below the 38 scholarship line). Replace the inputs with your own and compare — that comparison is the useful meaning of “typical”.
How do I calculate IB Score by hand?
Use the stated model — Subject total = sum of six 1–7 grades; core adds 0–3 — and substitute in the order the tool prints (it starts from Sum of six grades = 34). On the example inputs the hand route lands on 34, exactly what the calculator shows. A spreadsheet reproduces it in two or three cells; doing it once by hand is what makes the automated answer trustworthy.
What happens to IB Score if group 2 changes by 10 %?
The engine was re-run with that field moved by ten percent while everything else stayed fixed: the subject total goes across 33 to 35, a swing of roughly 1.8 % around the 34 baseline. That ratio is the practical definition of how much this input matters.
Is the IB Score result of 34 good or bad?
Neither, on its own — the label “Six subjects at these grades put 34 on the board; with a typical core award (2) the projection is 36 — one step above the 24-point diploma floor and below the 38 scholarship line” is the band this figure falls in for the example inputs, and your own inputs will place you elsewhere on the same ladder. Judge the number against your history and your alternatives, and remember that a ten-percent error in Group 2 alone moves it by ≈1.8 %.
How often should I check IB Score?
Whenever an input changes by more than a few percent, and otherwise on the rhythm of your decisions — before a purchase, a review, a renewal. IB Score is a snapshot, not a subscription; stale snapshots are the most common silent error in Education & Academics planning.
What affects IB Score the most?
Sensitivity depends on where you start, but the inputs Group 1 and Group 2 typically move IB Score further than the rest because they enter the formula multiplicatively. If you can only measure two things well, measure those and hold the others at conservative defaults.
Can you pass with 24 and a 3?
Diploma rules add minimums — no 3s at HL, no NL conditions, plus the 9-point pattern.
Does IB count for college credit?
US universities commonly grant 6–8 cr per 6/7 at HL; policies vary.
Is my data private on this page?
Yes — computation happens locally in your browser, with no account, no tracking of your inputs and nothing sent to a server. The printed formula is the whole story of what happens to your figures.
Glossary for IB Score
- Core (typical)
- 2 for the IB Score worked case; it sits next to the main result because it carries context the headline leaves out.
- Projected total
- 36 in the default IB Score calculation — one of the secondary figures an experienced reader checks before trusting the primary number.
- Diploma floor
- 24 on the example inputs — a companion figure printed beside the headline of IB Score so that no result is read in isolation.
- Subject total
- The primary output of this tool: 34 for the default inputs, computed exactly from Subject total = sum of six 1–7 grades; core adds 0–3.
- Worked example
- The step-by-step substitution printed above, so the arithmetic can be re-derived by hand or in a spreadsheet.
- Verdict band
- A named zone on the range of plausible results; the example inputs land in “Six subjects at these grades put 34 on the board; with a typical core award (2) the projection is 36 — one step above the 24-point diploma floor and below the 38 scholarship line”, and your inputs may not.
- Sensitivity (±10 %)
- How far the IB Score moves when a single input is nudged ten percent either way; the ranked list on this page is computed live from this engine.
Where the IB Score model comes from
Everything above runs on one stated formula, applied without hidden coefficients: Subject total = sum of six 1–7 grades; core adds 0–3. Source of record: IB Diploma grading guide. Where a professional version of this calculation differs, it differs in inputs and jurisdiction-specific coefficients, not in the algebra — which is why re-checking your inputs beats hunting for a second calculator.
This page is an estimation aid, not professional advice. The design rule is simple: two people entering identical figures must get identical answers. The sensitivity table above is part of that promise rather than a bonus: it lets you see how much of the result depends on how carefully you measured.
What to do with your IB Score next
Refresh the calculation every term or test cycle — weightings and raw scores both move.
The audience here is students and candidates planning toward a target score. Everything you need to defend the result — formula, substitution, sensitivity, source — is printed above, so the only remaining variable is the honesty of your inputs.