What is the ANC formula?

ANC = WBC × (segs + bands) ÷ 100, with the white count in cells per microlitre. If the report gives the white count in thousands, multiply by 1,000 first — a factor of a thousand is the commonest arithmetic error on this calculation and it moves the answer across every threshold.

What ANC counts as neutropenia?

Below 1,500 cells/µL is neutropenia: 1,000–1,500 mild, 500–1,000 moderate, under 500 severe, and under 100 profound. The 500 mark is where infection risk rises sharply, which is why it governs chemotherapy holds and neutropenic precautions.

Should bands be included?

Yes where they are reported. Bands are immature neutrophils and they function, so the standard formula counts them. Many modern analysers do not report a band count at all, in which case segs alone is the calculation — and the two figures are shown separately above so you can see what the difference costs.

What is benign ethnic neutropenia?

A persistently lower baseline ANC, common in people of African ancestry and associated with the Duffy-null phenotype, with no increased risk of infection. It matters because a normal baseline of 1,200 read against a 1,500 threshold has led to people being excluded from trials and having treatment withheld unnecessarily.

ANC Calculator

With white blood cell count 3.2 K/µL, segmented neutrophils 35 %, bands 5 %, anc comes to 1,280 cells/µL — neutrophil count. It is reached in 6 steps, the last of which is 3.2 * 1000 * (40 / 100), and each one is printed on the page with its numbers filled in. The formula is the one published by Neutropenia, not an approximation fitted to it.

Absolute neutrophil count from a white cell count and the differential, with the severity bands and the bands that only count segs.

Formula and sources checked 16 August 2026 · How we check

White blood cell count 3.2 K/µL, Segmented neutrophils 35, Bands 5

1,280 cells/µL

Neutrophil count for the example below. Editing a field recomputes the calculator below; this figure holds the answer the page was loaded with.

It is written into the HTML rather than drawn by a script, so a search engine reading this page without running JavaScript still finds an answer.

White blood cell countK/µLAs the report gives it — thousands per microlitre.Segmented neutrophils%Bands%Immature neutrophils. Many analysers report zero; include them when they are counted.

Neutrophil count

1,280 cells/µL

Neutrophils, segs plus bands: 35 + 540 %
Absolute neutrophil count: 3.2 * 1000 * (40 / 100)1,280 cells/µL
The same in SI units: 1280 / 10001.28 ×10⁹/L
Counting segs alone: 3.2 * 1000 * (35 / 100)1,120 cells/µL
Severity band, 0 none to 3 profound: 1
How far below 1,500: max(0, 1500 - 1280)220 cells/µL

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Worked example

A white count of 3.2 K/µL with 35% segs and 5% bands is 40% neutrophils: an ANC of 1,280 cells/µL, or 1.28 ×10⁹/L. That is mild neutropenia — below the 1,500 threshold but well above the 500 at which infection risk climbs steeply. Leaving the bands out would give 1,120 and the same band.

How to work it out yourself

1.Add the segmented neutrophils and the bands to get the neutrophil percentage.
2.Multiply the white cell count by 1,000 to get cells per microlitre.
3.Multiply by the neutrophil percentage divided by 100.
4.Divide by 1,000 for the SI figure in ×10⁹ per litre, which is how much of the world reports it.

The formula

Neutrophils, segs plus bands35 + 5
Absolute neutrophil count3.2 * 1000 * (40 / 100)
The same in SI units1280 / 1000
Counting segs alone3.2 * 1000 * (35 / 100)
Severity band, 0 none to 3 profound
How far below 1,500max(0, 1500 - 1280)

Source: Neutropenia — StatPearls, NCBI Bookshelf, National Cancer Institute — absolute neutrophil count

Questions people actually ask

What is the ANC formula?: ANC = WBC × (segs + bands) ÷ 100, with the white count in cells per microlitre. If the report gives the white count in thousands, multiply by 1,000 first — a factor of a thousand is the commonest arithmetic error on this calculation and it moves the answer across every threshold.
What ANC counts as neutropenia?: Below 1,500 cells/µL is neutropenia: 1,000–1,500 mild, 500–1,000 moderate, under 500 severe, and under 100 profound. The 500 mark is where infection risk rises sharply, which is why it governs chemotherapy holds and neutropenic precautions.
Should bands be included?: Yes where they are reported. Bands are immature neutrophils and they function, so the standard formula counts them. Many modern analysers do not report a band count at all, in which case segs alone is the calculation — and the two figures are shown separately above so you can see what the difference costs.
What is benign ethnic neutropenia?: A persistently lower baseline ANC, common in people of African ancestry and associated with the Duffy-null phenotype, with no increased risk of infection. It matters because a normal baseline of 1,200 read against a 1,500 threshold has led to people being excluded from trials and having treatment withheld unnecessarily.

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