NLR Calculator (Neutrophil-to-Lymphocyte Ratio)
HealthCalculate the neutrophil-to-lymphocyte ratio (NLR) from CBC differential percentages. A standard lab reference calculation, not a diagnostic tool.
Neutrophil-to-Lymphocyte Ratio
1.83
What is a NLR?
The NLR Calculator computes the neutrophil-to-lymphocyte ratio from CBC differential percentages, a simple ratio sometimes referenced in research literature as a general marker related to inflammation. This is a standard lab reference calculation, not a diagnostic tool.
For related CBC ratio calculations, see the Mentzer Index Calculator and ANC Calculator.
How to use this NLR calculator
- Enter your neutrophil percentage from your CBC differential.
- Enter your lymphocyte percentage.
- Read the NLR instantly.
- Discuss any specific lab results with a qualified healthcare professional for proper interpretation.
Formula & Methodology
NLR = Neutrophil % ÷ Lymphocyte % Worked example — 55% neutrophils and 30% lymphocytes: NLR = 55 ÷ 30 = 1.83
Frequently Asked Questions
NLR is a simple ratio between neutrophil and lymphocyte percentages (or counts) from a complete blood count differential, sometimes referenced in research literature as a general marker related to inflammation.
NLR is calculated by dividing the neutrophil percentage by the lymphocyte percentage from a CBC differential — since both are percentages of the same total WBC count, the ratio is the same whether you use percentages or absolute counts.
No — this calculator performs the mathematical ratio only. Interpreting what a specific NLR value means for your health requires a qualified healthcare professional reviewing your complete lab results and clinical history.
Both are standard components of a complete blood count (CBC) differential, commonly reported together on routine blood test results.
NLR has been studied in various research contexts as a general marker sometimes associated with the balance between innate (neutrophil) and adaptive (lymphocyte) immune response, though its specific clinical use varies and should be interpreted by a healthcare professional.
Yes — the ratio works the same way whether you use neutrophil and lymphocyte percentages or their absolute counts, since the total WBC count cancels out of the ratio either way.
The [ANC Calculator](/anc-calculator/) calculates the absolute neutrophil count, which could be used alongside a similarly calculated absolute lymphocyte count to derive the same ratio this calculator computes directly from percentages.
This calculator provides the ratio calculation only, without a specific threshold interpretation — any consideration of what a specific value might suggest should come from a qualified healthcare professional reviewing the complete clinical picture.
This calculator does not provide reference range interpretation; typical ranges can vary between labs and populations, and your specific result should be interpreted alongside your lab's reference range by a healthcare professional.
Like the [Mentzer Index Calculator](/mentzer-index-calculator/) and [Hematocrit to Hemoglobin Ratio Calculator](/hematocrit-to-hemoglobin-calculator/), NLR is a simple derived ratio computed from values already present on a standard CBC report.
Also known as