Internal Medicine · ICU and Critical Care

Neutrophil-to-Lymphocyte Ratio (NLR) calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Neutrophil count (×10³/µL)

×10³/µL

Allowed range: 0–50 ×10³/µL

Lymphocyte count (×10³/µL)

×10³/µL

Allowed range: 0–20 ×10³/µL

Result

2 fields remaining

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Professional use only

For qualified clinicians. Independently verify inputs, calculations, source guidance, and applicability before any clinical action. This calculator does not replace clinical judgment.

Source: Forget P, Khalifa C, Defour JP, Latinne D, Van Pel MC, De Kock M. What is the normal value of the neutrophil-to-lymphocyte ratio? BMC Res Notes. 2017;10:12. DOI: 10.1186/s13104-016-2335-5. NLR = absolute neutrophil count / absolute lymphocyte count (same units). In 413 healthy working adults (age 21–66) the mean NLR was 1.65 and the normal range (mean ± 1.96 SD) was 0.78–3.53; the authors caution that these limits may not apply to other populations, such as older adults. Bands use the displayed one-decimal result: ≤0.7 below, 0.8–3.5 within, ≥3.6 above the healthy-adult range. (2017)

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Clinical inputs

Neutrophil count (×10³/µL)Accepted range: 0 to 50
Lymphocyte count (×10³/µL)Accepted range: 0 to 20

Primary source

Forget P, Khalifa C, Defour JP, Latinne D, Van Pel MC, De Kock M. What is the normal value of the neutrophil-to-lymphocyte ratio? BMC Res Notes. 2017;10:12. DOI: 10.1186/s13104-016-2335-5. NLR = absolute neutrophil count / absolute lymphocyte count (same units). In 413 healthy working adults (age 21–66) the mean NLR was 1.65 and the normal range (mean ± 1.96 SD) was 0.78–3.53; the authors caution that these limits may not apply to other populations, such as older adults. Bands use the displayed one-decimal result: ≤0.7 below, 0.8–3.5 within, ≥3.6 above the healthy-adult range. (2017)

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