How this calculator works
NLR divides the neutrophil count by the lymphocyte count from the same blood sample. The total white cell count cancels if both quantities are percentages of that same total. Use either two absolute counts or two percentages. The ratio has no units. This calculator reports no universal high or low cut-off because interpretation depends on the illness, population and sampling time. The result is an estimate for information only and is not medical advice.
Formula
NLR = neutrophils / lymphocytes. Neutrophils = NLR x lymphocytes. Lymphocytes = neutrophils / NLR.
Worked example
4000 neutrophils/µL divided by 2000 lymphocytes/µL gives NLR 2. A differential with 70% neutrophils and 20% lymphocytes gives NLR 3.5.
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Frequently asked questions
Do I need the total white cell count?
No. Matching percentages or matching absolute counts give the same ratio.
Can lymphocytes be zero?
No finite ratio is defined when its denominator is zero.
Does a high NLR identify one disease?
No. Many conditions and treatments affect the differential; a ratio alone does not identify a cause.