How our DDCET rank predictor works (and where it can be wrong)

Any rank predictor is only as good as the data behind it. So we wanted to be upfront about exactly how ours works – what numbers we’re using, how we crunch them, and where it can go wrong. You can try the predictor here, or just keep reading.

Where the numbers come from

Every year, ACPC puts out a long PDF that lists, for every branch and college, the marks and rank of the first and last student who got admitted there. So for example: at Government Polytechnic Ahmedabad, the first student to get a Computer seat had X marks and Y rank, and the last one had A marks and B rank.

Multiply that by every branch, every college, every category – and you end up with a few hundred real, official data points connecting marks to ranks. We use the 2024 and 2025 versions of this list.

Why not just use our leaderboard?

Our leaderboard only shows people who’ve uploaded their sheet on this site. That’s a small slice of the ~20,890 students who actually appeared, and it’s a skewed slice:

• The people who go looking for an unofficial result checker are usually the more engaged ones, so the leaderboard skews higher than the real cohort.
• Some branches upload more than others, so the mix isn’t representative either.

If we only used the leaderboard, high scorers would get a rank that looks worse than reality, and low scorers would get one that looks better. ACPC’s tables cover the actual ranked students, so they sidestep that problem.

Filling in the gaps

ACPC’s table doesn’t list every single score. It might have 145 and 142, but not 143.5. So for any score in between, we just draw a straight line between the two closest numbers we do have.

Example: if 145 marks gave rank 1,200 and 142 marks gave rank 1,500, then 143.5 is halfway, and we’d call it roughly rank 1,350.

Nothing fancy. We tried more complex math, but it doesn’t really help – and it gets weird near the edges of the table where there’s less data. A straight line between known points is honest about what we know.

Mixing two years together

One year alone isn’t enough – every paper is a little different. The same 120 marks got pretty different ranks in 2024 vs 2025. So we use both years, but lean much more on the recent one:

• 2025 – 80 % (most recent, and students who took the 2026 paper said it felt harder than 2025)
• 2024 – 20 % (kept as a small reality check)

When ACPC publishes the 2026 merit list, we’ll check how this weighting did and adjust if needed. As more years pile up after 2026, the recent year will keep getting most of the weight and older years will contribute progressively less.

Why we show a range

Nobody can tell you the exact rank you’ll get in 2026 – the result list isn’t out yet. A single number would be guessing too confidently. The range is our honest guess at where your rank should land.

How we build the range (updated for 2026)

Earlier we just showed two numbers – the 2024 rank and the 2025 rank for your score. Now we do better. After talking to students who took the 2026 paper, most said it felt harder than 2025 – and definitely tougher than 2024. So we trust 2025 more, and only use 2024 as a small reality check.

• The middle of the range – mostly based on 2025, with a small nudge from 2024. So if 2025 says rank 600 and 2024 says rank 800, the middle is around 640 (closer to 2025).
• The width of the range – about half of what it used to be. We can be more confident now because we have a clearer idea which year 2026 looks like. The range never closes completely – there’s always at least a small window so you don’t see a fake-precise single number.

When 2024 and 2025 already agreed about your score – like both putting 195 marks at rank 1 – the range stays tight. When they disagreed (often around 80–130 marks), the range opens up so you can see the uncertainty.

We’ll revisit the weight when ACPC publishes the actual 2026 merit list – once we can score this method against ground truth, the 80/20 lean can be tuned to whatever fits best.

One extra trick on the result page

When you upload your sheet, we know two things: your score, and where you sit on our leaderboard. That second piece lets us nudge the estimate a bit.

Say the history says your rank should be somewhere between #500 and #800, but you’re already ranked #1000 on our leaderboard. Your real rank in the full cohort can’t be better than #1000, because everyone ranked above you here is also in the full cohort somewhere. So we shift the range up to match – it becomes about #1000 to #1300, keeping the same width. We’re not making the prediction less uncertain, just moving it to a position that’s actually possible.

The standalone predictor doesn’t do this – it doesn’t know your leaderboard rank yet. It just shows you the pure historical range.

Where this can go wrong

No predictor is right all the time. Here’s the honest list:

• 2026 might just be different. If the paper is way harder or way easier than 2024 and 2025, your real rank could fall outside what we show.
• The number of students changes each year. 2024 and 2025 had different totals. We use 20,890 as the upper limit, but 2026 might be a different size.
• Ties. If lots of people score the same total as you, ACPC breaks ties by BE01 marks, then BE02, then who had fewer wrong answers, then date of birth. We can’t tell where you’ll land inside a tie cluster.
• It’s a general merit estimate. Branch and category cutoffs shift things again during counselling, so the rank you get from us isn’t the same as your seat-allocation rank.
• Very low scores get fuzzy. If your score is below the lowest one in the ACPC tables, we just say “near the bottom” rather than guessing a precise number.

How to actually use this

1. Get your total marks – either by adding them up yourself, or just uploading your OMR sheet so we do it for you.
2. When you’re filling the ACPC preference list, assume you’ll get the worse end of the range. Then keep a stretch option on top in case you’re lucky.
3. Read the branch-wise cutoffs guide and compare rank to rank, never marks to marks. Marks needed for a rank change every year, the rank itself doesn’t.
4. Once ACPC publishes the official merit list, use that for the actual counselling. The predictor is just for the waiting period.

Why we’re being open about all this

Most rank predictors out there don’t tell you anything about how they work. Which means when they’re wrong, you have no way to tell why, or push back. We’d rather show the math so if something looks off, you can call it out.

Try the tool at /rank-predictor, or upload your OMR sheet on the homepage to get the same estimate with your actual graded marks.