What this calculator does
Neutrophil-to-lymphocyte ratio (NLR) works out a simple inflammation marker calculated from a routine blood differential. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
The inputs explained
| Field | What to enter |
|---|---|
| Absolute neutrophil count (cells/µL) | A number, measured in cells/µL. Starts at 4000. |
| Absolute lymphocyte count (cells/µL) | A number, measured in cells/µL. Starts at 2000. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with absolute neutrophil count
Every other input is held at the calculator’s starting values while absolute neutrophil count varies. Select any row to load that scenario into the calculator.
| Absolute neutrophil count (cells/µL) | NLR | Typical healthy range | Reading |
|---|---|---|---|
| 2,000 | 1.00 | about 1 - 2 | Within the typical range |
| 3,000 | 1.50 | about 1 - 2 | Within the typical range |
| 4,000 | 2.00 | about 1 - 2 | Within the typical range |
| 6,000 | 3.00 | about 1 - 2 | Mild elevation: a common grey zone in the literature |
| 8,000 | 4.00 | about 1 - 2 | Elevated: often studied as a marker of physiological stress or inflammation |
| 12,000 | 6.00 | about 1 - 2 | Elevated: often studied as a marker of physiological stress or inflammation |