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Mean Corpuscular Volume Calculator

Find the average red-cell volume from hematocrit and RBC count.

How it is calculated

MCV is the average volume of one red blood cell. The tool uses MCV (fL) = Hct (%) × 10 ÷ RBC, where Hct is the hematocrit as a percentage and RBC is the red cell count in 1012 per litre, the same numbers as millions per microlitre. The result is rounded to whole femtolitres. The class is taken from the unrounded value: below 80 fL is Microcytic, 80 to 100 inclusive is Normocytic and above 100 is Macrocytic. These cut-offs are fixed in the tool; laboratories use slightly different reference ranges, and children have their own. Hematocrit must be a percentage from 5 to 100 (a fraction such as 0.42 is rejected), and the red cell count must lie between 0.5 and 10; values outside those limits show no result. This is educational and does not replace a lab report.

Worked example

A blood count shows a hematocrit of 42% and a red cell count of 4.8 ×1012/L. MCV = 42 × 10 ÷ 4.8 = 420 ÷ 4.8 = 87.5, shown as 88 fL. That falls between 80 and 100, so the class is Normocytic. For comparison, a hematocrit of 30% with an RBC of 4.2 gives 71 fL, which is Microcytic, and 38% with 3.5 gives 109 fL, which is Macrocytic.

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Common mistakes

  • Entering hematocrit as a fraction (0.42) instead of a percent (42). The tool rejects any hematocrit below 5 and shows no result, so type 42 and not 0.42.
  • Entering the RBC count in cells per microlitre (4,800,000) instead of 4.8. The tool rejects it and shows no result; use the 1012/L or millions form.
  • Using the hemoglobin value in place of hematocrit. They are different tests with different units, and mixing them gives a meaningless volume.
  • Treating the class as a diagnosis. Microcytic, Normocytic and Macrocytic only describe average cell size, and the cause needs other results and a clinician.
  • Typing a hematocrit below 5 or above 100, or a red cell count outside 0.5 to 10. These cannot be real blood counts, so the tool gives no result.

Sources

About this calculator

Mean corpuscular volume (MCV) is a standard red-blood-cell index reported on every complete blood count, calculated as hematocrit percentage multiplied by ten and divided by the red blood cell count in millions per microliter. The result, expressed in femtoliters, falls into a normal reference range of roughly 80 to 100 fL in most laboratories, with values below that range called microcytic and values above it called macrocytic.

Clinicians and hematology labs use MCV as the first branch point when classifying anemia: a low MCV points toward causes like iron deficiency or thalassemia trait, a normal MCV with low hemoglobin suggests anemia of chronic disease or acute blood loss, and a high MCV points toward vitamin B12 or folate deficiency, liver disease, or certain bone marrow disorders. It is one of several indices, alongside MCH and MCHC, doctors read together rather than in isolation.

This calculator reproduces the standard MCV formula from hematocrit and red cell count so you can see how the index is derived; it is provided for educational purposes and does not replace a laboratory report or a clinician’s interpretation.

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