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Enter serum albumin, current weight, and usual weight to quickly calculate your NRI score, assess nutritional status, and identify malnutrition risk levels.
Published NRI arithmetic with albumin g/L and same-unit current/usual weight. Malnutrition diagnoses and automatic categories were removed. Not ideal-weight GNRI; not a stand-alone treatment decision. Reference
Enter data to assess nutritional status.
Calculation Formula: NRI = 1.519 × albumin (g/L) + 41.7 × current/usual weight; no cap at 1 or ideal-weight substitution.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
The Nutritional Risk Index (NRI) is a calculation that combines a serum albumin result with the ratio of current weight to usual weight. This page takes three positive numbers: albumin in g/L, current weight in kg, and usual weight in kg. It returns one NRI score rounded to one decimal place. It does not label the score with a risk category.
In the published expression, “usual weight” is the person’s usual body weight used as the reference in the calculation. Use a value supported by the person’s records or clinical team rather than substituting an ideal or target weight. The classic NRI described in hospital research is distinct from the Geriatric Nutritional Risk Index (GNRI), which is a different index and uses a different weight reference.
NRI = 1.519 × albumin (g/L) + 41.7 × (current weight ÷ usual weight)
Both weights must use the same unit, so the ratio has no unit. The formula uses the full ratio: when current weight exceeds usual weight, this implementation does not cap the ratio at 1. Calculations use the entered values and display the final score to one decimal place.
For example, with albumin 42 g/L, current weight 60 kg, and usual weight 70 kg: 1.519 × 42 + 41.7 × (60 ÷ 70) = 99.540… The displayed result is 99.5. This example checks the arithmetic; it is not a clinical interpretation.
A published multinational hospital study gives the NRI formula as serum albumin in g/L combined with present weight divided by usual weight. That evidence describes a research measure and population context, not a universal diagnostic rule. The score shown here is simply the output of that arithmetic expression with the inputs supplied.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Enter the serum albumin result from the lab report in g/L. If a report uses g/dL, convert before entering: multiply the number by 10. For example, 4.0 g/dL equals 40 g/L.
Enter both weights in kg and use the same weight unit for each. Choose the usual-weight reference according to the relevant record or clinical instructions; do not replace it with ideal weight just to complete the calculation.
Once all three entries are valid positive numbers, the score appears automatically. It is rounded to one decimal place. Use Reset to clear the entries and start again.
For albumin 42 g/L, current weight 60 kg, and usual weight 70 kg, first divide 60 by 70, then multiply the ratio by 41.7. Add 1.519 multiplied by 42. The unrounded sum is about 99.5409, so the displayed score is 99.5. If you use 4.2 instead of 42 for an albumin report of 4.2 g/dL, the unit mismatch will materially change the result.
Use cases
See how the tool fits into real work and everyday tasks.
If you already have an albumin result and a documented usual weight, calculate the arithmetic score and bring the inputs, units, and result together when discussing the record with a clinician or dietitian.
When reviewing a spreadsheet or study calculation that uses this expression, reproduce a sample row with the same albumin units and weight reference. Confirm that the current-to-usual ratio is used without a cap in this page’s calculation.
Q&A
Find concise answers to common questions and confusing cases.
Convert it to g/L by multiplying by 10 before entering it. For instance, 3.8 g/dL is 38 g/L. The calculator’s albumin input is labeled g/L.
No. It displays only the calculated score rounded to one decimal place. It does not apply cutoffs, diagnose malnutrition, or recommend treatment.
No. GNRI is a separate index with a different weight reference and calculation. This page asks for usual weight and calculates the NRI expression shown above; do not enter ideal weight as a substitute.
MedlinePlus says an albumin blood test by itself needs no special preparation. If other tests are being collected at the same time, follow the instructions from the ordering clinician or laboratory; do not change medicines without medical advice.
Notes
Review scope, result limitations, and important precautions before use.
This calculator performs a formula calculation; its score is not a diagnosis or a personal nutrition plan. Do not use it alone to decide on supplements, treatment, surgery, or follow-up. Ask a qualified clinician to interpret health results in context.
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