JEE Main Rank Predictor: Marks to Percentile and AIR

JEE Main publishes a percentile first and an All India Rank only after the final session. Students who have matched their response sheet against the provisional key usually have a marks total in hand and want two answers quickly. Where that total lands on the percentile scale, and whether the rank it implies clears the JEE Advanced bar. This tool gives an estimate for both.

Type your marks across Physics, Chemistry and Mathematics, or your NTA percentile if the scorecard is already out, and the result panel shows an estimated percentile, a Common Rank List band and a JEE Advanced flag. A reference table underneath maps ten marks levels to percentile and rank at the same candidate count, so you can see how much a few extra marks are worth.

The estimate is built on previous years' marks-to-percentile patterns and a candidate count you can edit. It is for planning choice lists and deciding how hard to push for the second session. Your scorecard remains the only official figure.

1. Pick I know my marks for an answer-key tally, or I know my percentile once your NTA score is published.
2. Enter your marks out of 300 after negative marking, or your percentile up to four decimals.
3. Set Candidates who appeared to the session strength NTA announces for your year. The default is 12,00,000.
4. Read the estimated CRL band, the midpoint rank, the percentile and the JEE Advanced flag.
5. Compare your figure with the marks-to-percentile reference table under the result before deciding whether to reappear in the next session.

The tool holds a curve of 24 anchor points that pair a marks total with an NTA percentile, drawn from previous years' published patterns. 300 maps to the 100th percentile, 250 to 99.9, 175 to 99.0, 120 to 96.0, 100 to 93.5, 50 to 75.0 and 0 to 0. Between any two anchors the tool uses a straight line, so a marks total of M between a lower anchor L and an upper anchor U gets the fraction t equal to (M minus L marks) divided by (U marks minus L marks), and the percentile is the lower percentile plus t times the gap.

The rank is then (100 minus percentile) divided by 100, multiplied by the candidates who appeared, rounded to a whole number with a minimum of 1. The headline band runs from 85 percent to 115 percent of that rank, because movement of that size between years is routine.

The JEE Advanced flag compares the midpoint rank with 2,50,000. The JEE Advanced information brochure limits eligibility to the top 2,50,000 candidates in the JEE Main B.E. or B.Tech paper across all categories, so a midpoint at or under that number shows Likely to qualify.

In percentile mode the curve is read in reverse to give the marks your percentile implies, and the rank comes from the percentile you typed.

• JEE Main marks: total out of 300 with negative marking applied, accepted from minus 75 to 300
• NTA percentile: the total NTA score from the scorecard, 0 to 100, four decimal places
• Candidates who appeared: the divisor for rank, default 12,00,000, minimum 1,000
• JEE Advanced: Likely to qualify when the midpoint rank is 2,50,000 or better

Hypothetical: a candidate scores 165 out of 300 and leaves the pool at 12,00,000.

165 sits between the anchors at 160 (98.5) and 175 (99.0). The fraction t is (165 minus 160) divided by (175 minus 160), which is 5 divided by 15, or 0.3333. The percentile is 98.5 plus 0.3333 times 0.5, which is 98.6667.

Rank is (100 minus 98.6667) divided by 100, times 12,00,000. That is 0.013333 times 12,00,000, which rounds to 16,000. The band is 16,000 times 0.85, or 13,600, to 16,000 times 1.15, or 18,400. Since 16,000 is well inside 2,50,000, the panel shows Likely to qualify for JEE Advanced.

The band is the figure to plan with. On the tool's curve, 190 marks maps to about rank 8,400 and 160 to about 18,000 at the default pool, so 30 marks in that region is roughly a doubling of rank.

The percentile shown to four decimals is an estimate of the NTA score, which is what JoSAA and state counselling bodies use for the first session. NTA's real percentile is calculated within each shift, by taking the share of candidates in that shift who scored at or below you. The tool cannot see shift-level data, so it uses one curve for everyone.

The JEE Advanced flag only checks the overall count. Each category has its own share of the 2,50,000 seats, so a candidate in a reserved category can qualify with a rank beyond that number, and the actual cut-off percentile for each category is announced by NTA with the final result.

Each JEE Main session is normalised separately, and the January and April papers differ in difficulty. The same marks can therefore land on different percentiles in the two sessions, and the curve here is a single blended pattern from previous years. Expect the real percentile to differ, more so in the 95 to 99 range where the curve is steep.

The rank shown is the Common Rank List position. Category ranks and the best-of-two-sessions rule that NTA applies are not modelled. The candidate pool is a round default, and rank scales directly with it, so enter the published session strength as soon as NTA releases it. Everything is computed in your browser.

Use the band to shortlist NIT, IIIT and GFTI tiers and to decide about the second session. Only the NTA scorecard and the JoSAA seat allotment are official.