Law School Admission Index Calculator
Calculate an admission index from an LSAT score, LSAC undergraduate GPA and the A, B and C coefficients used by a particular law school. LSAC documents the general formula, but the coefficients and the way an index is used are school-specific.
Index = (A × LSAT) + (B × GPA) + C- Enter valid values above to see the arithmetic.
What the Law School Admission Index Means
LSAC describes an admission index as a school-specific combination of LSAT score and undergraduate GPA.
The documented formula
LSAC states the calculation as Index = (A × LSAT) + (B × GPA) + C. The individual law school selects the constants.
Not every school uses an index
LSAC states that not all law schools use index formulas, and schools that do use them do not necessarily use them in the same way.
The index is school-specific
LSAC’s cautionary guidance says the index calculation is unique for each law school and is a starting point for applicant evaluation, not a complete admission decision.
Use the LSAC-calculated UGPA
LSAC standardizes undergraduate grades for CAS. Its conversion table includes 4.33 for an A+, so the LSAC GPA can differ from the GPA shown by a college.
Where the Coefficients Come From
The calculator deliberately does not provide made-up school presets. LSAC’s Academic Summary Report documentation says the constants A, B and C are selected by individual law schools and may change. A calculation is meaningful only when you use the coefficients applicable to the school and reporting context you are evaluating.
If you do not have the coefficients, do not substitute another school’s values or an arbitrary example and interpret the result as an admissions signal. LSAC also cautions against placing excessive weight on the apparent precision of an index. For your GPA input, use the appropriate LSAC undergraduate GPA rather than assuming the GPA printed on your transcript is identical.
Admission Index Formula Examples
These examples demonstrate the arithmetic only. The coefficient sets are explicitly fictional and are not attributed to any law school.
Fictional coefficient set A
(0.016 × 165) + (0.242 × 3.70) − 0.284 = 3.2514. This demonstrates the formula only.
Fictional coefficient set B
(0.020 × 160) + (0.300 × 3.50) − 0.500 = 3.7500. The raw scale is determined by the coefficients.
Why coefficients matter
(1 × 170) + (15 × 3.90) = 228.5. Do not compare this raw number with an index produced by a different formula.
Admission Index Mistakes to Avoid
Using invented or outdated coefficients
Coefficients are school-specific and can change. Confirm the values relevant to the school before treating the result as meaningful.
Using the wrong GPA
LSAC calculates undergraduate GPA under CAS rules. It can differ from a college transcript GPA, so use the appropriate LSAC figure when the formula calls for it.
Comparing raw index numbers across formulas
Different coefficients create different numerical scales. A larger raw number from one formula is not automatically stronger than a smaller number from another.
Treating the index as an admission prediction
LSAC describes the index as a convenient starting point and warns against excessive reliance on its apparent precision. It is not an admission-probability calculator.
Law School Admission Index FAQ
What formula does this calculator use?+
Does every law school use an admission index?+
Can this calculator tell me my chance of admission?+
Why does the GPA input allow 4.33?+
Can I compare index values from two different schools?+
How This Calculator Is Maintained
Umer Farooq
The calculator documents its formula, assumptions and limitations and links to primary LSAC sources. No professional admissions credential or independent expert review is claimed.
Read the CalcsDone Methodology →