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Neutrophil-to-Lymphocyte Ratio (NLR) = absolute neutrophil count (ANC) / absolute lymphocyte count (ALC), a widely-published general inflammatory marker reference ratio used across many research and clinical contexts. If given as percentages of WBC, absolute counts are first derived. Commonly cited normal reference range is roughly 1-3. Pure arithmetic on given lab values. For general reference and educational purposes only — not a medical diagnosis. Consult a doctor for actual interpretation of a complete blood count.
How it works
Choose whether you have absolute counts or WBC with percentages. If percentages, the tool first derives ANC and ALC from WBC count, then divides ANC by ALC.
- Enter what lab values do you have?.
- Enter absolute Neutrophil Count, ANC (cells/uL) — if using absolute counts.
- Enter absolute Lymphocyte Count, ALC (cells/uL) — if using absolute counts.
- Enter wBC count (x10^9/L) — if using percentages.
- Enter neutrophil percentage (%) — if using percentages.
- Enter lymphocyte percentage (%) — if using percentages.
- Click Calculate to see your results.
Examples
ANC 4500, ALC 2000
NLR = 4500 / 2000 = 2.25 — within the commonly cited normal range of roughly 1-3.
Who should use it
- Reviewing a CBC with differential.
- General inflammation-marker research and education.
Industry applications
- Hematology and general medical research reference
- Clinical education
Advantages
- Simple, widely-referenced ratio.
- Supports both absolute-count and percentage-based inputs.
Limitations
- A general research-literature reference ratio, not a validated diagnostic test for any specific condition.
Common mistakes to avoid
- Confusing the percentage-based derivation units — WBC should be entered in x10^9/L, not cells/uL, when using the percentages mode.
Best practices
- Interpret NLR alongside the full clinical picture rather than as a standalone value.
Tips
- NLR trends over time are often more informative in the research literature than a single isolated value.