Difference between Percentage & Percentile & calculation of percentile:

Percentage: As you all know percentage is a number out of 100.Percentage marks = (Obtained marks / Total marks) ×100

Percentile:Percentile score of a candidate reflects the number of students who have scored below that student in his/her own Board ( CBSE, ICSE etc..)
Example:In a particular board 4000 candidates appeared in the examination.If a candidate obtained 70 % marks and 2000 students have scored below 70%, then the percentile of that student = (2000×100)/4000 = 50.0

Normalization of marks

Step 1:
Calculate percentile (P) of all the candidate of board XYZ who are eligible for the JEE (Main) exam, with reference to their board result.
For a Board XYZ
Total Number of the candidates appearing in board exam = 4000

 Marks of candidates in Board Exam (m) Number of candidates who scored below the candidate (m) Percentile Calculation Percentile (p1) 50% 1500 (1500/4000)×100 37.5 60% 1700 (1700/4000)×100 42.5 70% 2000 (2000/4000)×100 50.0 80% 2500 (2500/4000)×100 62.5 90% 3500 (3500/4000)×100 87.5

Step:2
In the same way calculate the percentile of all the candidates with reference to their JEE main score.
Let total number of the candidates appearing in JEE (Main) exam = 1000000

 JEE(Main) Score (n) Number of candidates below the candidate with JEE (Main) score (n) Percentile Calculation Percentile (p2) 75 500000 (500000/1000000)×100 50.0 100 600000 (600000/1000000)×100 60.0 150 700000 (700000/1000000)×100 70.0 200 800000 (800000/1000000)×100 80.0 250 900000 (900000/1000000)×100 90.0

Step: 3
Use the value of percentile (P1) calculated in step 1 (Table 1) and find out the same value of percentile in the table 2 (step 2). The corresponding JEE (Main) score would represent value of B1.
In our example the percentile of candidate with 70% board marks was 50.
So in table 2, percentile 50.0 represents JEE (Main) score of 75. So, B1 = 75.

Step:4
Calculate the percentile of the candidates of the particular board (say XYZ ) who appeared in the JEE main with reference to their JEE main score.
Number of the candidates of board xyz appeared in JEE main = 4000

 JEE(Main) Score (n) Number of candidates below the candidate with JEE (Main) score (n) Percentile Calculation Percentile (p3) 25 1000 (1000/4000)×100 25.0 50 1500 (1500/4000)×100 37.5 100 2000 (2000/4000)×100 50.0 150 3000 (3000/4000)×100 75.0 200 3600 (3600/4000)×100 90.0

Step: 5
Use the value of percentile (P1) calculated in step 1 (Table 1) and find out the same value in the table 3 (step 4). The corresponding JEE (Main) score would represent value of B2.
In our example the percentile of candidate with 70% board marks was 50.
So in table 3, percentile 50.0 represents JEE (Main) score of 100. So, B2 = 100
Step: 6

Bfinal = 0.5× (B1+B2)
In our example:
B final = 0.5× (75 + 100) = 87.5
For admission to CFTIs, it has been decided to use JEE Mains Marks (AO) and the normalized board marks(× B final)  in 60:40 ratio.So,
Composite score for drawing the merit list (c ) = 0.6× AO + 0.4× B final
In our example:
c  = 0.6× 75 + 0.4× 87.5 = 80.

For getting your estimated rank in IIT JEE you can use our  Rank Predictor This post was published by Aditya Singhal, co-founder of askIITians.

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