How to Use MELD Calculator
The MELD Calculator focuses on how to estimate liver disease severity from bilirubin, INR, creatinine, and dialysis status with the standard logarithmic formula. Follow these steps:
- Enter serum bilirubin in mg/dL — If the lab reports a value below 1, the calculator applies the common MELD floor of 1 for the logarithm.
- Enter INR exactly as reported, because INR has a large coefficient in the MELD equation
- Enter serum creatinine in mg/dL and select whether dialysis occurs at least twice weekly — Dialysis sets creatinine to 4 mg/dL for the calculation.
- Read the rounded MELD score and the raw component details to confirm which laboratory value is driving the result
Formula & Theory — MELD Calculator
The MELD Calculator uses the following calculation logic:
MELD = 3.78 × ln(bilirubin) + 11.2 × ln(INR) + 9.57 × ln(creatinine) + 6.43
Calculation rules:
bilirubin used = max(bilirubin, 1 mg/dL)
INR used = max(INR, 1)
creatinine used = 4 mg/dL if dialysis ≥ 2 times/week, otherwise max(creatinine, 1 mg/dL)
final MELD = max(raw MELD, 6)The MELD Calculator uses natural logarithms, so proportional changes matter more than simple absolute changes. A creatinine increase from 1 to 2 mg/dL moves the score differently from an increase from 3 to 4 mg/dL. The dialysis rule is included because frequent dialysis reflects severe renal dysfunction even if a single measured creatinine value is lower.
Use Cases for MELD Calculator
The MELD Calculator is most useful in these situations:
- Liver transplant education and MELD formula demonstrations.
- Checking whether bilirubin, INR, or creatinine is the main contributor in a case discussion.
- Auditing a manually reported MELD score before comparing it with a clinical system.