Absolute Eosinophil Count Calculator
The absolute eosinophil count (AEC) converts the eosinophil percentage from a complete blood count differential into a true number of eosinophils per microliter. Because the percentage depends on the total white cell count, the absolute count is the value used to detect and grade eosinophilia. The calculation multiplies the white blood cell count by the eosinophil percentage divided by 100. Enter the WBC in cells per microliter and the eosinophil percentage. The result, in cells per microliter, is the AEC. This is educational and not a diagnosis.
AEC formula
AEC = WBC * (eosinophil percent / 100)
WBC in cells per microliter
Eosinophils as a percentage of total WBC
Result in cells per microliter
For example, a WBC of 8,000 cells/uL with 5 percent eosinophils gives an AEC of 400 cells/uL. The same approach works for any differential percentage.
Eosinophilia categories
- Normal: below about 500 cells/uL.
- Mild eosinophilia: about 500 to 1,500 cells/uL.
- Moderate to marked: above 1,500 cells/uL.
- Hypereosinophilia: 1,500 cells/uL or higher on repeat testing.
- Reference ranges vary by laboratory.
Absolute eosinophil count: frequently asked questions
How is the absolute eosinophil count calculated?
The absolute eosinophil count (AEC) equals the total white blood cell (WBC) count multiplied by the eosinophil percentage divided by 100. For example, a WBC of 8,000 cells per microliter with 5 percent eosinophils gives an AEC of 400 cells per microliter.
What units are used?
Enter the WBC count in cells per microliter (cells/uL), the same as cells per cubic millimeter. The eosinophil share is entered as a percentage. The result is in cells per microliter.
What is a normal absolute eosinophil count?
A normal AEC is commonly cited as below about 500 cells per microliter. Mild eosinophilia is roughly 500 to 1,500, and hypereosinophilia is generally 1,500 or above. Reference ranges vary by laboratory.
Why use the absolute count instead of the percentage?
The percentage alone can be misleading because it depends on the total white cell count. The absolute count gives the true number of eosinophils and is the value used to grade eosinophilia.
Is this a diagnosis?
No. The AEC is one laboratory value. Elevated counts have many causes, including allergy, asthma, parasites and other conditions, and must be interpreted by a clinician. This calculator is for education only.
Official sources
- National Library of Medicine (NCBI): Eosinophilia and the complete blood count.
- Centers for Disease Control and Prevention: Eosinophilia and parasitic disease information.
Reviewed by the CalculatorHub team, edited by James Graham, 17 June 2026. See our methodology.