Can lymphocyte or monocyte percentages be used?

No. This calculator accepts absolute counts only. Percentages without a compatible total white-cell count are not interchangeable with absolute cell concentrations.

Is there one normal LMR cutoff?

No. Research thresholds vary substantially by disease, cohort, treatment, outcome, and sampling time, so this page does not assign a universal category.

What can affect the LMR?

Infection, inflammation, medicines, stress, cancer, hematologic conditions, treatment, and collection timing can alter either absolute count and therefore the ratio.

Educational reference only. Not a diagnostic tool. See full disclaimer.

HematologyLMR

Lymphocyte-to-Monocyte Ratio Calculator

Calculate LMR from compatible absolute lymphocyte and monocyte counts.

Content updated: July 18, 2026View sources

Absolute lymphocyte count

Absolute monocyte count

Lymphocyte-to-monocyte ratio

—

Absolute-count ratio; no universal category is assigned

Normalized lymphocytes: — · monocytes: — ×10⁹/L

About

The lymphocyte-to-monocyte ratio (LMR) divides contemporaneous absolute lymphocyte and monocyte counts. It is a nonspecific research-derived blood-count ratio, not a general diagnostic or prognostic test.

Formula

LMR = absolute lymphocyte count ÷ absolute monocyte count

Interpretation

What the result represents: A unitless ratio of two absolute white-cell counts.

Input units: Each absolute count may use ×10³/µL, ×10⁹/L, or cells/µL and is normalized to ×10⁹/L. Differential percentages are not accepted.

Worked example: Lymphocytes 2.0 ×10⁹/L divided by monocytes 0.5 ×10⁹/L gives 4.00.

Applicable population: Research contexts using a contemporaneous complete blood count with absolute differential.

Interpretation limitations: Published associations and cutoffs vary by disease, population, treatment, medicines, infection, inflammation, and sampling time. This ratio does not assign cancer, infection, inflammation, cardiovascular risk, or prognosis.

References

FAQ

Related Calculators

NLR

Calculate neutrophil-to-lymphocyte ratio from absolute counts or percentages.

PLR

Calculate platelet-to-lymphocyte ratio from compatible absolute counts.

SII

Calculate SII from compatible absolute platelet, neutrophil, and lymphocyte counts.

Disclaimer

Educational and informational reference only. Not intended to replace professional medical advice, diagnosis, treatment, or independent verification.