European Baccalaureate Calculator (0–10 scale)
Computes EB overall with default weights Preliminary 50% + Written 35% + Oral 15%. Diploma threshold defaults to 50% (2021+) and can be switched to 60% (pre-2021) or customized.
Custom component weights (optional)
If these don’t sum to 100, they’ll be auto-normalized.
| Preliminary Breakdown | ||||
|---|---|---|---|---|
| Subject | Grade (0–10) | Coeff | Weighted | Note |
| Written Exams | ||||
|---|---|---|---|---|
| Exam | Grade (0–10) | Weight | Weighted | Note |
| Oral Exams | ||||
|---|---|---|---|---|
| Exam | Grade (0–10) | Weight | Weighted | Note |
Disclaimer: European Baccalaureate policies can vary by year/version. This tool applies the common split (50/35/15) and pass thresholds (60% pre-2021, 50% 2021+). Always verify with your school/office.
Why a “European Baccalaureate calculator” matters
Whether you’re a student sanity-checking your trajectory, a parent trying to decode school reports, or a developer building a school/EdTech tool, the European Baccalaureate (EB) has a precise arithmetic structure. Get the weights wrong by even a few points, and a borderline pass can look like a fail (or vice versa). Below is the officially aligned model for 2025, translated into plain English and then turned into a calculator-ready spec.
The official 2025 weighting at a glance
Final mark is out of 100, expressed to two decimals. It’s built from three components:
C = Preliminary mark (the big “coursework + Pre-Bac” average) → 50%
W = Average of five final written exams → 35%
O = Average of three final oral exams → 15%
Final formula:
Final = 0.50 × C + 0.35 × W + 0.15 × O.
Two crucial clarifications:
C (Preliminary) is itself made from A and B marks. In 2025 the Preliminary = 40% A + 60% B, and then this preliminary (C) counts 50% of the overall diploma.
Pass mark for the European Baccalaureate is 50/100 overall. (Earlier years used 60; the current pass level is 50.)
Rounding/precision rules: Official texts specify the final overall EB mark is out of 100 and accurate to two decimals, while C, W, O are kept to one decimal before the final combination. If you’re implementing a calculator, mirror that precision pathway.
Fairness safeguards: Written and oral EB exams are double-marked by an internal and an external examiner; if the difference is large, a third corrector may be used. Your calculator needn’t model the correction workflow, but it helps to know where the numbers come from.
What exactly goes into A, B, W and O?
A mark (formative/class marks): teacher assessments during S7 (classwork, tests, etc.).
B mark (Pre-Bac exams): short and long Pre-Bac examinations (usually January window); these are summative assessments. Together, A (40%) and B (60%) produce the Preliminary (C).
W (written finals): five written EB exams, each worth 7% of the overall diploma (for a total of 35%). Typical configuration includes L1, L2, Mathematics (3 or 5 periods) and two 4-period options, depending on student choices.
O (oral finals): three oral EB exams, each worth 5% of the overall diploma (for a total of 15%). Subjects vary by the written/oral selection matrix.
Important: For the Preliminary (C), schools compute the average across subjects (with specific local rules). In current guidance, Religion/Ethics is excluded from the preliminary average; check your school’s implementation notes but this exclusion appears in 2024/2025 handbooks.
Calculator-ready spec (the simple mode)
If you already know your three big components as percentages:
Input:
C (Preliminary) as a percentage with one decimal (e.g., 67.4)
W (Average of five written) as a percentage with one decimal
O (Average of three orals) as a percentage with one decimal
Compute (preserve specified precision):
Final = roundTo2( 0.50C + 0.35W + 0.15*O )
Decide status: Final ≥ 50.00 → Pass; else Fail.
Precision tip: “roundTo2” means bankers’ rounding isn’t required; standard half-up to two decimals is fine unless your school specifies otherwise. Keep C, W, O at one decimal before combining, matching official phrasing.
Calculator-ready spec (the advanced mode)
If you do not have C/W/O ready:
Preliminary C
Inputs:
A (class/formative) as percentage (one decimal)
B (Pre-Bac exams) as percentage (one decimal)
C = roundTo1( 0.40A + 0.60B ).
Written W
Inputs: five written exam marks (each typically reported out of 10 at source, but convert to a percentage).
W = roundTo1( average_of_five_written_percentages ). Because each written paper contributes equally (7% of overall), a straight average is appropriate for W.
Oral O
Inputs: three oral exam marks (convert to percentage).
O = roundTo1( average_of_three_oral_percentages ). Each oral contributes equally (5% of overall).
Final
Final = roundTo2( 0.50C + 0.35W + 0.15*O ).
Worked examples (with realistic rounding)
Example 1 — Straightforward trajectory
A = 68.6 (class/formative), B = 72.4 (Pre-Bac)
C = roundTo1( 0.40×68.6 + 0.60×72.4 ) = roundTo1( 27.44 + 43.44 ) = roundTo1( 70.88 ) = 70.9
Written marks (five papers as %): 71, 69, 74, 72, 70
W = roundTo1( (71+69+74+72+70)/5 ) = roundTo1( 356/5 ) = roundTo1( 71.2 ) = 71.2
Oral marks (three papers as %): 68, 73, 70
O = roundTo1( (68+73+70)/3 ) = roundTo1( 211/3 ) = roundTo1( 70.3 ) = 70.3
Final = roundTo2( 0.50×70.9 + 0.35×71.2 + 0.15×70.3 )
= roundTo2( 35.45 + 24.92 + 10.545 )
= roundTo2( 70.915 ) = 70.92
→ Pass (≥ 50).
Example 2 — Borderline case (where rounding matters)
A = 49.6, B = 52.8 → C = roundTo1( 0.40×49.6 + 0.60×52.8 ) = roundTo1( 19.84 + 31.68 ) = roundTo1( 51.52 ) = 51.5
W (five written %): 49, 52, 51, 50, 50 → W = roundTo1( 50.4 ) = 50.4
O (three oral %): 48, 49, 53 → O = roundTo1( 50.0 ) = 50.0
Final = roundTo2( 0.50×51.5 + 0.35×50.4 + 0.15×50.0 )
= roundTo2( 25.75 + 17.64 + 7.50 )
= roundTo2( 50.89 ) = 50.89
→ Pass, even though several individual figures hovered near 50. This is why a precise calculator (with the official rounding sequence) is essential.
What does the calculator not decide?
It does not decide which subjects you take as written vs oral; that’s an academic/administrative choice following EB rules (e.g., written set includes L1, L2, Maths (3 or 5 periods) and two options; orals follow the official matrix).
It does not arbitrate examiner differences; the EB has a built-in double-correction (and third-marker) process for fairness.
Your calculator simply applies the published weights, rounding, and pass rule.
FAQs — European Baccalaureate calculators (2025)
1) What’s the official pass mark in 2025?
50/100 overall. Some older documents mention 60, but current guidance specifies 50. eursc.eu+1
2) How do I compute the Preliminary (C) if I only have A and B?
Use C = 0.40×A + 0.60×B (round to one decimal). This C will later be weighted at 50% in the final. eursc.eu
3) For W and O, do individual papers have different weights inside their block?
No. Each written contributes equally inside W (five papers → average), and each oral contributes equally inside O (three orals → average). Their block weights are 35% and 15% respectively. eursc.eu
4) Do I include Religion/Ethics in the Preliminary average?
Current handbooks indicate the Preliminary excludes Religion/Ethics; check your school’s local circular, but that exclusion appears in the 2024/2025 guidance. eursc.eu
5) How precise must my calculator be?
Keep C, W, O to one decimal; compute Final to two decimals. That mirrors official expression rules. es-karlsruhe.eu
6) My written exams are reported out of 10. How do I convert?
Multiply by 10 to express them as percentages (e.g., 7.3/10 → 73%). Then average for W or O, apply the weights, and round at the specified stages.
7) Does the calculator need to handle double-marking/third corrector?
No. Schools release the agreed mark after double-correction (and third correction if needed). Your tool just consumes the published values. eeb2.eu
8) Is the pass threshold also 50/100 for each paper?
No. The overall EB pass is 50/100. Schools may set internal expectations per component, but the diploma decision rests on the weighted final. eursc.eu
9) Can a very high Preliminary offset a weaker Written?
Yes, within limits. Since C is 50%, a strong Preliminary can partially cushion weaker exam blocks. That’s why sustained effort during S7 matters. eursc.eu
10) Which subjects are written vs oral?
There’s a structured matrix: five written (including L1, L2, Mathematics 3 or 5 periods, plus two 4-period options) and three oral exams, chosen according to EB rules. Your school provides the official list. UCAS
11) What if I’m right on the edge—does rounding save me?
Possibly. Because C/W/O are kept to one decimal and the Final is two decimals, a few tenths can swing the outcome in borderline cases—another reason to mirror the official rounding sequence. es-karlsruhe.eu
12) Are calculators different per country/school?
They shouldn’t be for the EB weighting/rounding. Local portals may present inputs differently, but the 0.50/0.35/0.15 final weighting and 0.40/0.60 A/B split for C are system-level rules in 2025. eeb2.eueursc.eu
13) Do subject choices change the weights?
Not at the block level. Your subjects determine which exams are written/oral, but W is still 35% and O is 15%. eursc.eu
14) Can I input predicted marks for “what-if” planning?
Yes—good calculators support a scenario mode so you can tweak A, B, and projected exam scores to see outcomes before the June session.
15) Is there any official calculator I should use instead?
Schools publish official guidance, not a universal web calculator. For authoritative rules and definitions, rely on EB handbooks and implementing regulations; your calculator should simply mirror those texts.