Law School Admissions Calculator: How to Use It Well
Goal: estimate the likelihood of admission based on LSAT, GPA, and school selectivity, with an optional application-strength boost. This tool gives an educational approximation to help you plan targets and strategy—not an official decision predictor.
Inputs
- LSAT score (120–180)
- Undergrad GPA (0.0–4.0)
- School selectivity (tier): T14, Selective, or Regional
- Application strength boost (−0.10 to +0.30 typical). Use 0 if unsure.
Outputs
- Index score (unitless)
- Estimated admit probability (0–100%)
Assumptions
- Logistic model using LSAT and GPA, with tier-specific weights and a shift.
- Boost adjusts the log-odds (index), representing soft factors (e.g., compelling work history, extraordinary leadership, URM, strong recommendations). It is not a guarantee.
- Applies to first-degree U.S. JD programs; rounding and tier anchoring simplify variation across schools.
Method (kept simple)
We compute a tier-specific index, then convert it to a probability using a logistic function. Constants differ by tier.
- Index (T14): index_t14 = a_t14 · LSAT + b_t14 · GPA + c_t14 + shift_t14
- Index (Selective): index_selective = a_selective · LSAT + b_selective · GPA + c_selective + shift_selective
- Index (Regional): index_regional = a_regional · LSAT + b_regional · GPA + c_regional + shift_regional
- Choose index by selected tier.
- Probability: probability = 1 / (1 + exp(−(index + boost)))
Parameters (by tier)
- T14: a=0.07, b=0.90, c=−12.0, shift=−1.2
- Selective: a=0.065, b=0.85, c=−10.0, shift=0.0
- Regional: a=0.06, b=0.80, c=−8.0, shift=+1.0
Worked Examples
- Example A (T14 stretch): LSAT=170, GPA=3.9, Tier=T14, Boost=0.03. Index ≈ 1.03 → Probability ≈ 73.7%.
- Example B (Selective match): LSAT=160, GPA=3.5, Tier=Selective, Boost=0. Index ≈ −0.65 → Probability ≈ 34.3%.
How to Interpret
- 70–85%: solid odds; keep quality control on personal statements and timing.
- 40–60%: competitive; nudge LSAT a bit or expand school list.
- Under 30%: reach; consider retake planning and application-strength improvements.
Planning Tips
- Target setting: move one input at a time to see sensitivity. For instance, +2 LSAT points in T14 ranges often shifts probability more than +0.05 GPA.
- Boost calibration: if you have exceptional softs or a recognized boost (e.g., URM), try +0.15 to +0.30; for strong but not extraordinary experiences, +0.05 to +0.10; otherwise 0.
- Tiers portfolio: run the calculator across T14, Selective, and Regional to form a balanced list (reaches, targets, likelies).
Validation and Edge Cases
- Ranges: LSAT is clamped to 120–180; GPA to 0.0–4.0.
- Do not mix GPAs (unweighted vs. school-reported). Use the official/standard 4.0 scale if available.
- Early Decision is not explicitly modeled. A small positive boost may approximate its marginal effect, but policies vary.
- International transcripts and grade conversions can shift real-world outcomes more than this model captures.
Quick Next Steps
- If your probability is below your comfort level, test a new LSAT goal and map study weeks needed.
- Create a short log: actual LSAT practice scores, GPA finalization, and any soft-factor milestones. Update your boost assumption conservatively.