Neutrophil-Lymphocyte Ratio Calculator

Enter your absolute neutrophil and lymphocyte counts from a CBC with differential into the calculator to determine the neutrophil-lymphocyte ratio.

Medical note: This calculator is for educational purposes only and is not medical advice or a diagnosis. NLR is a non-specific marker and should be interpreted by a licensed clinician in context (symptoms, exam, full CBC/differential, medications, pregnancy, acute stress, etc.). Use values from a CBC with differential performed by a certified lab. If you have concerning symptoms or abnormal results, seek medical care.

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Neutrophil-Lymphocyte Ratio Formula

The following formula is used to calculate the neutrophil-lymphocyte ratio for a given number of neutrophils and lymphocytes.

NLR = N / L

Variables:

NLR is the neutrophil-lymphocyte ratio
N is the number of neutrophils
L is the number of lymphocytes

To calculate the neutrophil-lymphocyte ratio, divide the absolute neutrophil count by the absolute lymphocyte count (from the same CBC with differential). NLR is a non-specific, inflammation-related marker, and values can change for many reasons—so it should be interpreted in clinical context rather than used to diagnose any condition on its own.

What is the Neutrophil-Lymphocyte Ratio?

The neutrophil-lymphocyte ratio (NLR) is a calculated value based on two white blood cell types measured on a complete blood count (CBC) with differential. Because it reflects a balance between neutrophils and lymphocytes, it is sometimes discussed in the context of inflammation and physiologic stress. However, NLR is not specific and can be influenced by many factors (including acute illness, chronic inflammatory conditions, smoking, medications such as corticosteroids, and pregnancy), so it should not be used as a stand-alone screening or diagnostic tool. For deeper background, review patient education from major hospital systems and medical reviews (e.g., NIH/NCBI) that discuss CBC interpretation and inflammatory markers.

Limitations & Next Steps

Non-specific: A high or low NLR can occur for many different reasons and does not identify a specific disease by itself.
Context matters: Age, pregnancy status, recent infections, stress, smoking, and medications (including steroids) can shift neutrophils/lymphocytes.
Discuss abnormal results: If your CBC or NLR is concerning—or you have symptoms—review results with a clinician who can interpret them alongside the rest of your labs and clinical picture.

How to Calculate Neutrophil-Lymphocyte Ratio?

The following steps outline how to calculate the Neutrophil-Lymphocyte Ratio.

First, determine the number of neutrophils (N).
Next, determine the number of lymphocytes (L).
Finally, calculate the Neutrophil-Lymphocyte Ratio using the formula NLR = N / L.
After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem :

Use the following variables as an example problem to test your knowledge.

Neutrophils (N) = 4.0 ×10³/μL (4.0 K/μL)

Lymphocytes (L) = 2.0 ×10³/μL (2.0 K/μL)

NLR = N / L = 4.0 / 2.0 = 2.0