🇮🇩 Indonesia: SNBT UTBK-IRT Weighting Predictor
Estimate your SNBT-UTBK score on the 200–1000 scale used by SNPMB. Item Response Theory weights harder items more heavily — raw hits and a difficulty profile are required across all 7 subtests.
Predicted UTBK Score (200–1000)
How It Works
1. Item Response Theory (IRT)
SNPMB scores UTBK with IRT rather than a simple percentage. Each item carries a difficulty parameter b calibrated from how the national cohort answered it. Correct answers on hard items contribute more, easy items contribute less, and wrong/blank answers all score zero — there is no negative marking.
Because the exact b values are confidential, this tool uses your self-reported difficulty profile as a proxy multiplier (Easy ≈ 0.85, Mixed ≈ 1.00, Hard ≈ 1.15).
2. The 7 Subtests (160 items)
TPS: Penalaran Umum (30), PPU (20), PBM (20), PK (20). Literasi: Bahasa Indonesia (30), Bahasa Inggris (20), Penalaran Matematika (20). Total 160 items in 195 minutes.
Each subtest is scored on its own 200–1000 sub-scale, then the seven sub-scale scores are averaged equally to produce the overall UTBK score reported to PTNs.
3. Subscale Mapping (200–1000)
The accepted public approximation for each subtest is: score = 200 + (hits ÷ items) × 800 × IRT_mult, clamped to [200, 1000]. The composite is the unweighted mean of all seven subscales.
This avoids a common trap: simple percentage calculators report e.g. "80%" — but UTBK never reports percentages. PTNs only see the 200–1000 score.
4. Adversarial Boundary Trap
Zero hits in a single subtest still floor that subscale at 200 — but they drag your composite. A candidate with 160/160 raw hits on the Easy profile (multiplier 0.85) maxes out at ~880, while 130/160 on the Hard profile (1.15) lands roughly 840–936 depending on spread — often matching or exceeding the perfect Easy run. Difficulty selection matters as much as hit count.
Inputs out of range are clamped to [0, item count]; missing fields are treated as zero hits, which transparently surfaces under-performance instead of masking it.
Primary Regulatory Sources
- Official SNPMB (Seleksi Nasional Penerimaan Mahasiswa Baru) portal: snpmb.bppp.kemdikbud.go.id — administered by Balai Pengelolaan Pengujian Pendidikan, Kemdikbudristek.
- SNPMB Framework for UTBK: snpmb.id — official rules, materi, and timeline for SNBT, SNBP, and UTBK 2026.
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