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NLR Calculator (Neutrophil-to-Lymphocyte Ratio)

Health

Calculate the neutrophil-to-lymphocyte ratio (NLR) from CBC differential percentages. A standard lab reference calculation, not a diagnostic tool.

Reviewed by the thecalcu.com team · Last updated July 7, 2026

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Neutrophil-to-Lymphocyte Ratio

1.83

This calculator computes your Neutrophil-to-Lymphocyte Ratio from the values you enter.

Inputs
Neutrophil PercentageLymphocyte Percentage
Outputs
Neutrophil-to-Lymphocyte Ratio

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.

Why Use an NLR Calculator?

Calculating this ratio from raw CBC percentages is a quick manual task that this calculator automates instantly, giving the figure directly from values you already have on a lab report.

Who Should Use This Calculator?

  • Anyone reviewing their own CBC differential results who wants to calculate NLR.
  • Students of hematology or clinical research learning about this commonly referenced ratio.
  • Healthcare educators demonstrating the NLR formula.
  • Researchers working with CBC differential data.

What Insights Does the NLR Calculator Give You?

The Neutrophil-to-Lymphocyte Ratio is the sole output, calculated directly from your entered neutrophil and lymphocyte percentages, a simple reference figure sometimes considered in research and clinical discussions alongside other CBC values.

How to use this NLR calculator

  1. Enter your neutrophil percentage from your CBC differential.
  2. Enter your lymphocyte percentage.
  3. Read the NLR instantly.
  4. Discuss any specific lab results with a qualified healthcare professional for proper interpretation.
Show formula & methodology ↓Show less ↑

Formula & Methodology

NLR = Neutrophil % ÷ Lymphocyte %

Worked example, 55% neutrophils and 30% lymphocytes:

NLR = 55 ÷ 30 = 1.83

Frequently Asked Questions

What is the neutrophil-to-lymphocyte ratio (NLR)?
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.
How is NLR calculated?
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.
Is NLR a diagnosis?
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.
Where do I find neutrophil and lymphocyte percentages?
Both are standard components of a complete blood count (CBC) differential, commonly reported together on routine blood test results.
Why is NLR referenced in some research literature?
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.
Can I calculate NLR using absolute counts instead of percentages?
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.
How does this relate to the ANC Calculator?
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.
Is a higher or lower NLR considered notable?
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.
What is a typical NLR range?
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.
How does this relate to other CBC ratio calculators on this site?
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
NLR formulaneutrophil lymphocyte ratio calculatorinflammation ratio calculatorCBC ratio reference