For students and parents new to the International Baccalaureate Diploma Programme (IBDP), one of the most confusing aspects can be the IB scoring system.

Unlike many school boards where students receive marks or percentages, the IB Diploma is based on a 45-point scale. Understanding how these 45 points are calculated is important because universities around the world use IB scores when evaluating applications.

So, how exactly does the IB Diploma score work?

Let's break it down.

How Many Points Can You Get in the IB Diploma?

The maximum possible IB Diploma score is 45 points.

These points come from two main components:

Six subjects: Maximum 42 points
IB Core: Maximum 3 points

Therefore:

42 subject points + 3 core points = 45 points

Each of the six subjects is graded on a scale from 1 to 7, with 7 being the highest grade.

For example, a student might receive:

Mathematics HL – 6
Physics HL – 6
Chemistry HL – 7
English SL – 6
Economics SL – 6
Spanish SL – 5

The total subject score would be:

6 + 6 + 7 + 6 + 6 + 5 = 36 points

The student can then earn up to 3 additional points from the IB Core.

What Are HL and SL Subjects?

IBDP students study subjects at two different levels:

HL – Higher Level

SL – Standard Level

Students generally study three subjects at Higher Level and three at Standard Level, although programme structures can vary by school.

HL subjects cover greater depth and generally involve more teaching hours than SL subjects.

However, both HL and SL subjects are graded on the same 1–7 scale.

This means a 7 in an SL subject and a 7 in an HL subject are both worth seven points toward the student's overall score.

The difference is primarily in the depth, breadth and number of teaching hours, rather than the maximum grade available.

Understanding the IB 1–7 Grade Scale

Each IB subject receives a final grade from 1 to 7.

In general terms:

7 – Excellent

6 – Very Good

5 – Good

4 – Satisfactory

3 – Mediocre

2 – Poor

1 – Very Poor

A score of 4 or above is generally considered a passing grade for an individual subject, but achieving the IB Diploma involves meeting several additional conditions.

This is why simply adding six subject grades together isn't enough to determine whether a student will receive the diploma.

What Are the 3 Bonus Points?

The remaining three points come from the IB Core, which consists of:

Theory of Knowledge (TOK)

TOK encourages students to explore questions about knowledge and how we know what we know.

Extended Essay (EE)

The Extended Essay is an independent research project in which students investigate a focused question and produce an academic paper.

Creativity, Activity, Service (CAS)

CAS encourages students to participate in activities involving creativity, physical activity and service.

Importantly, CAS does not receive a separate numerical grade.

Instead, the student's performance in TOK and the Extended Essay contributes to the maximum three core points.

For example:

TOK + EE = 3 core points

A student who earns 39 points across six subjects and receives 3 core points could therefore achieve:

39 + 3 = 42/45

Is 45/45 Really Possible?

Yes.

A student who receives a 7 in all six subjects earns:

7 × 6 = 42 points

If the student also receives the maximum 3 core points, the final score becomes:

42 + 3 = 45/45

However, achieving 45 points is extremely challenging and represents an exceptional IB performance.

Students shouldn't view 45 as the only definition of success. University requirements differ significantly depending on the country, university and programme.