Calculates the absolute neutrophil count from the white cell count and differential, and grades neutropenia.
Result
Enter the white cell count and the neutrophil percentage.
Sources
3 studies
3
studies
13
citations
4,072
PubMed papers
Evidence
Known limitations
This review defines neutropenia as an ANC below 1,500 cells/µL and grades it mild (1,000 to 1,500), moderate (500 to 1,000) and severe (below 500). It discusses causes, from drugs and infections to inherited and immune neutropenias, and management by severity and the presence of fever.
Blood Res: Journal Metrics Score 2.8, Q1 · cited 13 times
PubMed · Free full text · DOI
In 25,222 participants aged 1 year and older in the US National Health and Nutrition Examination Survey (1999 to 2004), neutropenia (ANC below 1,500) was found in 4.5% of Black participants, 0.79% of white participants and 0.38% of Mexican-American participants. An ANC below 1,000 was found in 0.57% of Black, 0.11% of white and 0.08% of Mexican-American participants.
Ann Intern Med: Journal Metrics Score 4.6, Q1 · cited 384 times
Among 8,018 healthy Duffy-null adults from several countries, the lower reference limit of the ANC ranged from about 820 (Namibia) to 1,210 cells/µL (US). Each cohort’s local institutional reference interval classified 21.7% (US) to 50.9% (Saudi Arabia) of its participants as neutropenic.
The key review has been cited 13 times, and 4,072 PubMed articles mention the absolute neutrophil count in their title or abstract. Citation counts from OpenAlex and article counts from PubMed, retrieved November 9, 2026. Journal Metrics Scores and quartiles are from this site’s current release; follow the journal name for details.
After the result
Severe neutropenia · Mild or moderate neutropenia · Normal or high ANC
Assess for infection now. Find the cause and the trend. Read it with the clinical picture.
Next steps
Avoid common errors
5 common errors to avoid
and 3 more
When the ANC misleads
1Bands counted twice
An automated neutrophil percentage usually includes bands. Enter bands separately only when they come from a manual differential reported apart from segmented neutrophils.
2Very low white cell count
At a white cell count below about 1 × 10³/µL the percentage comes from few cells. Repeat the count and ask for a blood film review.
3Units
A count of 1.5 can mean 1.5 × 10³/µL (1,500 cells/µL). Check the unit on the report before entering it.
4Duffy-null
Healthy Duffy-null adults often have an ANC below 1,500. In four national cohorts, local laboratory reference intervals classified 21.7% (US) to 50.9% (Saudi Arabia) of them as neutropenic (Hibbs 2026).
5Timing
Neutrophil counts vary through the day and fall to a low point about 7 to 14 days after many chemotherapy regimens. One count is a snapshot.
Formula
WBC × (segmented neutrophils % + bands %) / 100, in cells/µL.
WBC × (neutrophils % + bands %) / 100
WBC × (segmented neutrophils % + bands %) / 100, in cells/µL.
Formula and grades
| Value | Formula |
|---|---|
| Absolute neutrophil count | WBC (cells/µL) × (segmented neutrophils % + bands %) / 100 |
| Units | 1 × 10³/µL = 1 × 10⁹/L = 1,000 cells/µL; cells/µL = cells/mm³ |
| Result | cells/µL | Meaning |
|---|---|---|
| Severe neutropenia | below 500 | Below 500 cells/µL: severe neutropenia, with a much higher risk of serious bacterial and fungal infection. A fever at this count is a medical emergency. |
| Moderate neutropenia | 500 to 999 | 500 to 999 cells/µL: moderate neutropenia, with a raised risk of infection. |
| Mild neutropenia | 1,000 to 1,499 | 1,000 to 1,499 cells/µL: mild neutropenia, usually with little added risk of infection on its own. |
| Not neutropenic | 1,500 or more | 1,500 cells/µL or more: not neutropenic by the usual definition. The upper limit of normal depends on the laboratory. |
What is counted
Grades
Reference ranges
Test cases
4 published cases, each also a test case
4 published cases; the calculator reproduces every result.
Worked examples
A 3-year-old boy in induction chemotherapy for acute myeloid leukemia had fever and knee cellulitis. His white cell count was 280 cells/µL with 6% neutrophils; the report gives an absolute neutrophil count of 17 cells/µL.
“total white blood cell count 280 cells/µL with 6% neutrophils (absolute neutrophil count 17 cells/µL)”
The calculator gives 16.8 before rounding. Febrile neutropenia at this count was treated with empirical broad-spectrum antibiotics.
Entered as: White blood cell count: 280 cells/µL; Neutrophils (segmented): 6 %.
Source: Thiamprasert T et al., IDCases 2026 (PubMed · Free full text · DOI)
A 40-year-old woman with chronic kidney disease developed agranulocytosis attributed to sinomenine. During recovery on days 7 to 9 her white cell count rose to 1.53 × 10⁹/L with 17% neutrophils; the report gives an ANC of about 0.26 × 10⁹/L.
“WBC increased from 0.66 to 1.53 × 10 9 /L, Neutrophil percentage (NEUT%) rose from 7.60% to 17.00% (ANC ~0.05 to 0.26 × 10 9 /L)”
0.26 × 10⁹/L is 260 cells/µL. A white cell count above 1 × 10⁹/L can still hide severe neutropenia.
Entered as: White blood cell count: 1.53 × 10³/µL (× 10⁹/L); Neutrophils (segmented): 17 %.
Source: Xin P et al., Clin Case Rep 2026 (PubMed · Free full text · DOI)
A 45-year-old woman with a stroke developed fever on the second day of admission. Her white cell count was 12.2 × 10⁹/L with 77.2% neutrophils, which the report gives as an ANC of 9.4 × 10⁹/L. Agranulocytosis, probably caused by prolonged piperacillin–tazobactam, followed later.
“a white blood cell count of 12.2 × 10 9 /L, with a neutrophil percentage of 77.2% and an absolute neutrophil count of 9.4 × 10 9 /L”
9,418 cells/µL is 9.4 × 10⁹/L, as reported.
Entered as: White blood cell count: 12.2 × 10³/µL (× 10⁹/L); Neutrophils (segmented): 77.2 %.
Source: Wang L et al., Medicine (Baltimore) 2026 (PubMed · Free full text · DOI)
A 21-year-old man with necrotizing pneumonia and sepsis from an undiagnosed pulmonary sequestration had a white cell count of 37.33 × 10³/µL with 82% neutrophils (an absolute count of 30.61 × 10³/µL) and 6% bands (an absolute band count of 2.24 × 10³/µL).
“a markedly elevated WBC of 37.33 × 10³/µL with a neutrophil predominance of 82% (absolute neutrophil count 30.61 × 10³/µL), bandemia at 6% (absolute band count 2.24 × 10³/µL)”
The report gives neutrophils and bands separately; the calculator adds both, as the ANC definition does: 30.61 + 2.24 = 32.85 × 10³/µL.
Entered as: White blood cell count: 37.33 × 10³/µL (× 10⁹/L); Neutrophils (segmented): 82 %; Band forms: 6 %.
Source: Eazer J et al., Cureus 2026 (PubMed · Free full text · DOI)
FAQ
6 questions and answers
and 4 more answers
Questions
ANC = white blood cell count × (segmented neutrophils % + band forms %) / 100. With a white cell count of 12.2 × 10³/µL and 77.2% neutrophils: 12,200 × 77.2 / 100 = 9,418 cells/µL, or 9.4 × 10⁹/L.
Neutropenia is usually defined as an ANC below 1,500 cells/µL in adults. It is graded mild at 1,000 to 1,499, moderate at 500 to 999 and severe below 500 cells/µL. Some sources call a count below 100 cells/µL profound neutropenia.
Yes, when they are reported separately. Bands are immature neutrophils and count toward the ANC. An automated analyzer usually reports a single neutrophil percentage that already includes them, so leave the band field empty in that case.
cells/µL and cells/mm³ are the same unit. 1,000 cells/µL equals 1.0 × 10⁹/L, so an ANC of 1,500 cells/µL is 1.5 × 10⁹/L.
No. People with the Duffy-null blood group, common in people of African and Middle Eastern ancestry, may have counts below 1,500 that are normal for them. In a multinational study of 8,018 healthy Duffy-null adults, the lower reference limit of the ANC was about 820 to 1,210 cells/µL (Hibbs 2026).
In most guidelines, fever with an ANC below 500 cells/µL, or one expected to fall below 500 within about 48 hours (for example, after chemotherapy), is febrile neutropenia. It needs urgent assessment and empirical antibiotics under the local protocol. This calculator does not replace that assessment.
Further reading
7 references with PubMed and DOI links
7
references
5
free full text
From Min KI et al., Blood Res 2025 to the newest case reports.
References
Contributed by Dr. Meng Zhao (MD · Former Neurosurgeon · Medical AI Researcher), from the original publications listed here. Last updated November 9, 2026. LinkedIn
The calculator code is tested against every worked example on this page before each release.
This calculator supports, and does not replace, clinical judgment. It is meant for healthcare professionals and is not medical advice for patients. Report an error through the contact page.
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