Absolute Eosinophil Count Calculator

Created by Małgorzata Koperska, MD
Reviewed by Bogna Szyk and Steven Wooding
Based on research by
Kovalszki A, Weller PF. Eosinophilia. Primary Care: Clinics in Office Practice (October 2016)See 1 more source
Huang J, Zhang Z, Liu S, Gong C, Chen L, Ai G, Zhu X, Zhang C, Li D. Absolute Eosinophil Count Predicts Intensive Care Unit Transfer Among Elderly COVID-19 Patients From General Isolation Wards. Frontiers in Medicine (November 2020)
Last updated: Feb 15, 2023

The absolute eosinophil count calculator uses white blood cell count, and eosinophil percentage to estimate the total number of acidophilic cells in your blood.

You might be interested in our other calculators regarding white blood cells: ANC – absolute neutrophil count calculator and absolute lymphocyte count calculator.

What are eosinophils?

They are white blood cells specialized in fighting parasites and certain diseases.
They are also mediators of allergic responses and are associated with bronchial asthma development – they are used as markers of the severity of the disease.

The name eosinophil or acidophil relates to the fact that this particular group is acid-loving: they show their affinity for acids by turning bright red after staining with eosin, an acidic red dye used in the standard procedure of microscope probe preparation.

What is a normal range of total eosinophil count?

The normal total eosinophil count range is 0.04-0.45 × 10³ cells/μL.

  • The state of eosinophil count elevation over 0.45 × 10³ cells/μL is called eosinophilia and is linked to allergic reactions and parasitic infections.

  • Hypereosinophilia is a state of elevation over 1.5 × 10³ cells/μL and can be due to the growth of mutant eosinophil cells or severe parasitosis or allergic reactions.

  • A total eosinophil count lower than 0.04 , called eosinopenia, can be associated with acute infections, burns, stress reactions, Cushing's syndrome, and the use of large doses of steroids.

What formula does the absolute eosinophil count calculator use?

To estimate the total eosinophil count (AEC), you first need to do a complete blood count (CBC). The values of white blood cell (WBC) count and eosinophil percentage (EOS%) are then used in this equation that finds the total eosinophil count:


The calculated absolute eosinophil count is expressed in thousands of cells per microlitre (10³ cells/μL).

💡 Another white blood cell calculator that might be useful to you is our ANC calculator without bands.


What is the absolute eosinophil count?

The absolute eosinophil count is a test similar to the total blood count, where the target is the number of eosinophil cells in a given blood sample.

Eosinophils are a type of white blood cell that intervenes in the presence of allergic reactions or infections of many kinds of pathogens: they are remarkably efficient against parasites, releasing a protein that prevents the organism from invading and reproducing in the cells.

How do I calculate the absolute eosinophil count?

To calculate the absolute eosinophil count, you can follow some simple steps:

  1. Measure or calculate the white blood cell count (WBC).

  2. Find the percentage of eosinophils (EOS%). You can find both these values after a complete blood count.

  3. Multiply the white blood cell count by the percentage of eosinophils (expressed as a decimal number): the result is the absolute eosinophil count (AEC), usually expressed as cells per microliter.

    AEC = WBC × EOS% / 100.

What is my absolute eosinophil count if my WBC is 9000 cells/µL and EOS% is 5%?

Your absolute eosinophil count is 450 cells/µL or 450 eosinophil cells per microliter of blood. To find this result:

  1. Convert the percentage of eosinophils to a decimal number: 5% = 0.05.

  2. Multiply the white blood cell count by the eosinophils percentage:

    9000 cells/µL × 0.05 = 450 cells/µL.

It's this easy! If your absolute eosinophil count is too high, your body may be reacting to an infection, and you may want to seek medical advice.

Why is my eosinophil count low?

A low eosinophil count or eosinopenia is not always a reason for worrying. If your body is not fighting infection, it's normal for the number of eosinophils to be reasonably low. However, lower-than-normal values may indicate one or more of the following:

  • Acute infections that redirect the eosinophils away from the blood;

  • Usage of drugs that suppress the immune system: remember to warn your doctor about it;

  • Alcohol abuse; and

  • Increased cortisol levels due to, for example, Cushing's syndrome.

If your eosinophil count is worryingly low, consult a doctor.

Małgorzata Koperska, MD
White blood cells (WBC)
Absolute eosinophil count
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