How are MCV, MCH, and MCHC calculated?

MCV equals haematocrit percent divided by red cell count, times ten. MCH equals haemoglobin divided by red cell count, times ten. MCHC equals haemoglobin divided by haematocrit percent, times one hundred. All three are derived from the three CBC values you enter.

What is the difference between MCH and MCHC?

MCH is the average mass of haemoglobin per red cell, measured in picograms. MCHC is the concentration of haemoglobin within the cell volume, measured in g/dL. MCH scales with cell size, while MCHC reflects how densely each cell is packed with haemoglobin.

How does MCV classify anaemia?

MCV below 80 femtolitres is microcytic, pointing to iron deficiency or thalassaemia. MCV between 80 and 100 is normocytic, seen in acute blood loss or chronic disease. MCV above 100 is macrocytic, suggesting B12 or folate deficiency, alcohol, or liver disease.

What does a high MCHC mean?

A genuinely high MCHC is unusual because there is a ceiling to how much haemoglobin fits in a cell. It most often signals hereditary spherocytosis or a laboratory artefact such as cold agglutinins, lipaemia, or a measurement error, so it warrants a check rather than a diagnosis.

Do these indices replace a blood film?

No. The indices give averages that narrow the differential quickly, but they hide mixed populations. A blood film, reticulocyte count, and iron or vitamin studies are still needed to confirm the cause. Reference ranges also vary by laboratory, age, and sex.

Red Cell Indices (MCV, MCH, MCHC) Calculator

The red cell indices turn three routine numbers from a full blood count into a description of the red cells themselves: how big they are and how much haemoglobin they carry. That description is the fastest way to narrow the cause of an anaemia, which is why MCV, MCH, and MCHC appear on every CBC report.

How it works

All three indices are simple ratios of the measured haemoglobin, haematocrit, and red cell count:

MCV  (fL)   = (Hct% / RBC) x 10
MCH  (pg)   = (Hb / RBC) x 10
MCHC (g/dL) = (Hb / Hct%) x 100

MCV is the average volume of a single red cell, MCH is the average mass of haemoglobin it carries, and MCHC is the concentration of haemoglobin packed into that volume. The haematocrit is entered as a percentage and the red cell count in units of 10 to the 12 per litre.

Classifying anaemia and notes

MCV drives the classic three-way split. A microcytic picture, MCV under 80 fL, points to iron deficiency, thalassaemia, or anaemia of chronic disease. A normocytic picture, MCV 80 to 100 fL, fits acute blood loss, haemolysis, or renal anaemia. A macrocytic picture, MCV over 100 fL, suggests B12 or folate deficiency, alcohol, liver disease, or myelodysplasia. MCHC adds a second axis: under 32 g/dL is hypochromic, while a value above the normal ceiling usually means spherocytosis or a lab artefact rather than true overconcentration.

These indices are averages and can hide a mixed red cell population, so they narrow the differential but do not close it. A blood film, reticulocyte count, and iron and vitamin studies remain essential, and reference ranges vary by laboratory, age, and sex.