M+QuickMedCalc
11 calculators

11 Hematology Calculators – Counts, Ratios, Iron & Anemia

Hematology calculators cover derived absolute leukocyte counts, red-cell and iron-related indices, CBC-derived inflammatory ratios, and a historical age-adjusted ESR reference estimate.

Use values from the same CBC, specimen, or defined assessment time point and distinguish percentages from absolute counts. Similar-looking ratios have different numerators, denominators, and evidence boundaries.

All medical calculatorsSources and review processMedical disclaimer

Choose a calculator by task

Use the task groups below to find the calculator whose formula, intended population, required measurements, and purpose match the task.

Absolute leukocyte counts

Derive ANC, absolute monocyte count, or absolute eosinophil count from compatible total and differential blood-count inputs.

Absolute Neutrophil Count (ANC) CalculatorCalculate ANC from same-CBC WBC, segmented neutrophils, and separately reported bands with explicit units and neutral limits.AMCAbsolute Monocyte Count CalculatorCalculate absolute monocyte count from a same-CBC total WBC and reported monocyte percentage, with exact unit normalization.AECAbsolute Eosinophil Count CalculatorCalculate absolute eosinophil count from a same-CBC total WBC and reported eosinophil percentage, with exact unit normalization.

Red-cell and iron-related indices

Select historical RPI, Mentzer arithmetic, or transferrin saturation according to the required red-cell or iron-study inputs and units.

Historical Adult Reticulocyte Production Index (RPI) CalculatorCalculate the historical adult Hillman RPI from a relative reticulocyte percentage and paired hematocrit using the fixed 45% standard and source-specific maturation bands.Mentzer Index Calculator for MicrocytosisCalculate the historical Mentzer Index from same-CBC MCV and RBC count as a non-diagnostic screening aid for microcytosis.Transferrin Saturation Calculator (TSAT)Calculate TSAT from same-assessment serum iron and laboratory-reported TIBC with exact unit normalization.

CBC-derived inflammatory ratios

Calculate NLR, PLR, LMR, or SII only from compatible same-assessment absolute counts or the explicitly supported differential mode.

Neutrophil-to-Lymphocyte Ratio (NLR) CalculatorCalculate NLR from matched absolute counts or percentages with exact decimal arithmetic and neutral interpretation limits.PLRPlatelet-to-Lymphocyte Ratio CalculatorCalculate platelet-to-lymphocyte ratio from matched absolute blood counts with exact unit normalization and nonspecific interpretation limits.LMRLymphocyte-to-Monocyte Ratio CalculatorCalculate LMR from same-CBC absolute lymphocyte and monocyte counts with exact unit normalization.SIISystemic Immune-Inflammation Index CalculatorCalculate the Hu 2014 SII from matched absolute platelet, neutrophil, and lymphocyte counts with exact unit normalization.

ESR reference estimate

Use the historical Miller-rule estimate only as a static age- and formula-specific ESR reference calculation.

Age-Adjusted ESR Calculator (Miller Rule)Reproduce the Miller 1983 source-cohort ESR upper-limit estimate for ages 20–65 using one explicit historical formula, with laboratory-method limitations.

How to choose a calculator in this category

  • Use same-CBC or same-assessment values and keep absolute counts distinct from differential percentages.
  • Choose the ratio whose defined numerator, denominator, and units match the laboratory question; NLR, PLR, LMR, and SII are not interchangeable.
  • Treat Mentzer, RPI, transferrin saturation, and the historical ESR rule according to their distinct formulas and specimen requirements.

Important limits

  • CBC-derived inflammatory ratios are nonspecific and do not establish infection, inflammation, malignancy, or prognosis.
  • Mentzer Index, RPI, iron arithmetic, and historical ESR estimates cannot establish a hematologic diagnosis on their own.
  • These tools do not recommend transfusion, antibiotics, iron, referral, or another treatment.

Review standardsRead the disclaimerReport a correction

Related calculator categories

General Medicine CalculatorsGastroenterology & Hepatology CalculatorsCardiology CalculatorsEmergency Medicine & Critical Care Calculators