MELD & MELD-Na Calculator
Enter recent lab values to estimate Model for End-Stage Liver Disease (MELD) and MELD-Na scores.
Results will appear here.
Educational use only. This tool does not replace physician assessment, transplant center protocols, or clinical judgment.
What is a MELD calculator?
A MELD calculator estimates liver disease severity using objective lab values. MELD stands for Model for End-Stage Liver Disease. It was originally developed to predict short-term mortality risk in people with advanced liver disease and is now widely used in transplant medicine.
In clinical settings, MELD helps prioritize liver transplant waiting lists and supports risk discussions. The newer MELD-Na version adds sodium, because low sodium levels are associated with worse outcomes in cirrhosis.
Inputs used in this calculator
1) Total bilirubin
Bilirubin reflects how well the liver processes and clears byproducts from blood. Higher values usually indicate reduced liver function or bile flow problems.
2) INR
INR measures blood clotting tendency. Since clotting proteins are made in the liver, a rising INR can reflect worsening synthetic liver function.
3) Creatinine
Creatinine is a kidney function marker. Kidney dysfunction significantly affects outcomes in advanced liver disease, so creatinine has a strong effect on MELD.
4) Sodium (for MELD-Na)
Lower sodium can indicate severe circulatory and hormonal changes seen in advanced cirrhosis. MELD-Na adjusts MELD upward when sodium is low.
Formula details and score limits
This page uses the commonly cited MELD and MELD-Na equations with standard clinical bounds:
- Minimum of 1.0 is used for bilirubin, INR, and creatinine in the logarithmic MELD equation.
- Creatinine is capped at 4.0 mg/dL; if dialysis is selected, creatinine is set to 4.0.
- Sodium is bounded between 125 and 137 mEq/L for MELD-Na.
- Final scores are rounded to whole numbers and shown on a 6 to 40 scale.
Different hospitals or updates to policy may use specific implementation details. Always defer to official transplant-center calculators for decisions.
How to interpret your MELD result
In general, higher scores suggest higher short-term risk. This calculator also gives a rough 90-day mortality band to provide context. Those percentages are approximate and should be treated as educational, not definitive.
- MELD < 10: lower short-term risk range
- 10–19: moderate risk range
- 20–29: high risk range
- 30–39: very high risk range
- 40+: extremely high risk range
MELD vs MELD-Na: which one matters more?
In many modern transplant systems, MELD-Na is the primary score because it better captures risk in patients with hyponatremia (low sodium). Still, both scores can be useful for understanding disease trajectory over time.
Important limitations
- MELD does not capture every complication of liver disease (for example, frailty, nutrition, infections, encephalopathy severity).
- Single-time lab values can fluctuate; trend over time is often more informative.
- Lab timing, assay differences, and acute illness can temporarily shift values.
- Clinical context and specialist judgment are always essential.
Practical tips when using a meld calculator
- Use the most recent, verified lab results.
- Recalculate after major clinical changes or new labs.
- Track values in a journal to discuss progression with your hepatology team.
- Do not self-adjust medications based on calculator output alone.
Bottom line
A meld calculator is a helpful way to turn lab values into a structured risk estimate. It is most useful when interpreted alongside symptoms, imaging, exam findings, and specialist input. If you or a loved one has cirrhosis or liver failure, discuss the score directly with a qualified clinician who can place it in full context.