Cardiac Rehabilitation And Quality Of Life Scores

Gait Nutritional Risk Index (NRI) Calculator

Clinical calculation support · Verify results before clinical use

Nutritional risk assessment

Enter current weight, usual stable weight, and serum albumin to calculate the NRI.

About the Nutritional Risk Index

The Nutritional Risk Index (NRI) estimates nutrition-related risk using serum albumin and the ratio of current to usual body weight. It is not the same as the Geriatric Nutritional Risk Index (GNRI), which commonly uses ideal body weight and has different formula/cutoffs.

Formula

NRI = 1.519 × serum albumin (g/L) + 41.7 × (current weight / usual weight)

Because the inputs here use albumin in g/dL, the equivalent implementation is 15.19 × albumin (g/dL) + 41.7 × (current weight / usual weight).

NRI score	Classification
≥100	No nutritional risk
≥97.5 to <100	Mild nutritional risk
≥83.5 to <97.5	Moderate nutritional risk
<83.5	Severe nutritional risk

Clinical considerations

Albumin can be affected by inflammation, fluid status, liver disease, renal losses, and other conditions; it is not a nutrition-specific marker.
Use a reliable usual-weight estimate and assess recent weight change, intake, physical findings, and underlying illness.
Do not use the NRI alone to diagnose malnutrition or determine nutrition support.

References

Buzby GP, Mullen JL, Matthews DC, Hobbs CL, Rosato EF.Prognostic nutritional index in gastrointestinal surgery. American Journal of Surgery. 1988;155(5):715–722. DOI: 10.1016/0002-9610(88)90395-6. The original publication details should be checked against the journal record; the commonly cited NRI formula and cutoffs are supported by subsequent clinical literature.

Velasco N, et al. (multinational population-based study).Does nutritional risk, as assessed by Nutritional Risk Index, increase during hospital stay? Clinical Nutrition. 2005;24(4):516–524. DOI: 10.1016/j.clnu.2005.04.003. Describes NRI formula with albumin in g/L and the commonly used risk categories.

Validity of nutrition risk index as a malnutrition screening tool compared with subjective global assessment in end-stage renal disease patients on peritoneal dialysis.Indian Journal of Nephrology. 2016. Full text: PubMed Central. Supports the formula, weight definition, and risk categories in a clinical validation context.

Clinical disclaimer: This calculator is intended to support, not replace, professional assessment. NRI classification does not establish a diagnosis by itself. Consider the patient’s clinical condition, inflammation, fluid balance, comorbidities, and other validated nutritional assessment methods before making management decisions.