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What is the Passing Marks Out of 50 in CBSE?

  • 19 February, 2026
What is the Passing Marks Out of 50 in CBSE?

When they get to know about a 50-mark paper in their CBSE exam, many students become confused. They often question as to how many marks are required to pass? Is it different from an 80-mark paper? Does internal assessment matter?

In this blog, you will clearly understand CBSE passing marks out of 50, how 33 percent of 50 is calculated, and what role internal assessment passing marks play, the minimum marks for 50-mark paper, and how CBSE rounding off rules work. Everything is explained in simple words so you can calculate your result without stress.

How CBSE Decides Passing Marks?

CBSE follows a simple rule for passing. Each subject requires a student to get a score of 33%. This rule is applicable to board exams for Classes 10 and 12. The same % criteria applies if your paper is out of 50. This indicates that the calculation is based on 33 percent of 50.

Let us understand this one step at a time:

  • 33% of 50
  • 33 ÷ 100 × 50 = 16.5

So, 33 percent of 50 is 16.5 marks. This means the minimum marks for 50-mark paper is 16.5. In most cases, marks are rounded according to CBSE rounding off rules, which we will explain later. This is the basic idea behind CBSE passing marks out of 50.

Exact Marks Required to Pass a 50-Mark Paper

Students usually want a clear number. Now, here it is:

  • 33 percent of 50 = 16.5
  • 5 is the required score
  • After applying CBSE rounding off rules, it becomes 17 marks.

Therefore, 17 is typically considered the minimal score for a 50-mark paper. When someone enquires about the CBSE passing score out of 50, the simple response is: To pass, you must receive at least 17 marks. Theory papers of 50 marks apply to this rule.

When the Subject Includes Internal Assessment?

Some subjects are divided like this:

  • Theory: 50 marks
  • Internal assessment: 20 or 30 marks

In such cases, students must also meet the internal assessment passing marks requirement. CBSE does not only look at total marks. It checks whether you have scored at least 33% separately in theory and internal parts, depending on the subject structure.

For example:

  • If theory is 50 marks: 33 percent of 50 = 16.5. You must score around 17 in theory.
  • If internal assessment is 20 marks: 33 percent of 20 = 6.6. You must score at least 7.

These are called internal assessment passing marks. So even if your total is good, you must meet the required internal assessment passing marks to pass the subject. This is an important part of understanding CBSE passing marks out of 50.

The Importance of 33%

According to CBSE, students must receive 33 percent on a theoretical paper of 50 marks. Let us calculate it again clearly:

  • 33 percent of 50 = 16.5

So, the minimum marks for 50 marks paper is 16.5 before rounding. Students sometimes think 15 marks may be enough. That is not correct. Since 33 percent of 50 equals 16.5, anything below that does not meet the required percentage. That is why CBSE passing marks out of 50 are based strictly on this calculation.

How CBSE Rounding Off Rules Work?

Students worry about half marks. So let us explain CBSE rounding off rules in simple terms.

  • When the calculated passing mark includes a decimal:
    • .5 and above is rounded up.
    • Below .5 is not rounded.

Since 33 percent of 50 equals 16.5, it is usually rounded to 17. That means the minimum marks for 50 marks paper becomes 17 after applying CBSE rounding off rules. However, rounding applies to calculated values, not random marks. For example, 16.4 will not become 17, but 16.5 will become 17. These CBSE rounding off rules help standardise results.

Theory and Internal: Both Matter Equally

When calculating CBSE passing marks out of 50, always check:

  • Theory marks.
  • Internal assessment marks.
  • Total combined marks.

Students must satisfy the internal assessment passing marks condition as well as the theory requirement.

Let’s look into one example:

  • Theory: 18 out of 50
  • Internal: 8 out of 30
  • Theory requirement: 33 percent of 50 = 16.5.
  • Internal requirement: 33 percent of 30 = 9.9.

Since internal is 8, which is below required internal assessment passing marks, the student may not pass. This shows why internal marks are important.

What Happens If You Score Exactly 17?

If you score 17 out of 50, you meet the required passing percentage set by CBSE. Since 33 percent of 50 equals 16.5, scoring 17 means you are above the minimum requirement. After applying CBSE rounding off rules, 16.5 is treated as 17, so this becomes the effective passing mark.

Quick Calculation Guide for Students

Here is a simple method:

  1. Take total marks (50).
  2. Multiply by 33.
  3. Divide by 100.
  4. You get 16.5.
  5. After applying CBSE rounding off rules, it becomes 17.

So, remember: Minimum marks needed = 17. Internal marks must also meet internal assessment passing marks.

Important Points to Remember

  • CBSE passing marks out of 50 are based on 33% rule.
  • 33 percent of 50 equals 16.5.
  • The minimum marks for 50 marks paper is around 17.
  • Students must secure internal assessment passing marks.
  • CBSE rounding off rules apply when decimals appear.

Conclusion

Understanding CBSE passing marks out of 50 is simple once you know the rule. Since 33 percent of 50 equals 16.5, students must score at least 17 after applying CBSE rounding off rules, which becomes the minimum marks for 50-mark paper. You must also secure the required internal assessment passing marks wherever applicable, as both theory and internal sections matter.

Understanding these calculations properly can help you stay clear of confusion, feel less nervous during exams, and concentrate on getting better results than what is required to pass.

At Billabong International High School (BHIS), we nurture understanding, build resilience, and prepare students to perform with assurance in every academic challenge. To learn more about our programme, get in touch with us right now!

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