Free MELD Calculator

What Is the MELD Calculator?

The Model for End-Stage Liver Disease (MELD) score is a numerical scale used by transplant centers to prioritize adult patients awaiting a liver transplant. This MELD calculator (a free online end-stage liver disease assessment tool) computes the score based on routine blood work, helping clinicians estimate the urgency of transplantation over the next 90 days. The score ranges from 1 (less severe) to 40 (critically ill). Notably, this tool is designed for adults aged 12 and older; it is not validated for children.

Important: This MELD score calculator is for educational and informational purposes only. It does not substitute for a professional medical evaluation. Always consult a hepatologist or transplant specialist for clinical decisions.

Required Laboratory Tests

To calculate the MELD score, you need the results of four blood tests. The values should be current (ideally drawn within the last few days).

• Creatinine (mg/dL) – reflects kidney function. Normal serum creatinine is about 0.6–1.2 mg/dL in adult males and 0.5–1.1 mg/dL in adult females. If the patient has undergone dialysis twice in the past week or 24 hours of continuous veno-venous hemodialysis (CVVHD), the creatinine value is automatically set to 4 mg/dL for scoring.
• Bilirubin (mg/dL) – a yellow pigment normally present in blood. The typical range for total bilirubin is 0.3–1.0 mg/dL.
• INR – a dimensionless clotting ratio derived from prothrombin time (PT). A normal INR lies between 1.0 and 1.5.
• Sodium (mEq/L or mmol/L) – the serum sodium level. The MELD system caps sodium values at a lower limit of 125 and an upper limit of 137 mEq/L; any value outside this range is adjusted accordingly.

The MELD Score Formulas

Two versions of the formula exist. The original formula (still used in some non‑US transplant societies) relies on creatinine, bilirubin, and INR:

$$\text{MELD} = 10 \times \left[ 0.957 \times \ln(\text{Creatinine}) + 0.378 \times \ln(\text{Bilirubin}) + 1.12 \times \ln(\text{INR}) \right] + 6.43$$

In January 2016, an updated formula (MELD‑Na) was introduced to incorporate serum sodium, which improves the prediction of waiting‑list mortality. The sodium‑adjusted score is:

$$\text{MELD}_{\text{Na}} = \text{MELD} + 1.32 \times (137 - \text{Sodium}) - 0.033 \times \text{MELD} \times (137 - \text{Sodium})$$

Both formulas yield a score between 1 and 40. The MELD Na calculator (often called the MELD‑Na score) is now the standard for most U.S. transplant programs.

Interpreting Your Score: 90‑Day Mortality

A higher MELD score indicates a greater risk of death within three months without a transplant. The table below outlines the estimated 90‑day mortality for each score range:

MELD Score Range	90‑Day Mortality
40	71.3 %
30–39	52.6 %
20–29	19.6 %
10–19	6.0 %
≤9	1.9 %

These percentages are derived from large transplant registry data and serve as a guide for listing priority. Other clinical factors (ascites, encephalopathy, functional status) also play a role in the final transplant decision.

Why Use an Online MELD Calculator?

An online MELD score calculator saves time and reduces calculation errors. By entering the four lab values (creatinine, bilirubin, INR, and sodium), you instantly receive the score and the corresponding mortality estimate. The tool also applies the sodium caps and dialysis rule automatically, ensuring a consistent result aligned with current UNOS (United Network for Organ Sharing) guidelines.

Whether you are a medical trainee learning the model or a clinician needing a quick check, this online liver transplant score calculator provides a reliable, up‑to‑date assessment of end‑stage liver disease severity.