Hematocrit / Hemoglobin Ratio Calculator

Created by Małgorzata Koperska, MD
Reviewed by Bogna Szyk
Last updated: May 08, 2022

The hematocrit to hemoglobin ratio calculator estimates the parameter used in medicine as a predictor of hemoconcentration. If you're relatively healthy, you can also calculate hemoglobin from hematocrit and vice versa.

Please note that Omni Calculator is not a doctor. If you're concerned about the results of your blood tests, consult a physician.

Hemoglobin vs hematocrit

Both hematocrit and hemoglobin are measurements associated with red blood cells and can be used to diagnose anemia or erythrocytosis.

  • Hematocrit is the volume percentage of red blood cells in the patient's blood, with normal value ranges 40 - 54% for adult males and 36 - 48% for females. It is assumed that the rest of the full blood volume is plasma.
  • Hemoglobin is a protein contained in red blood cells that is responsible for delivery of oxygen to the tissues, typically measured in g/dL. The normal Hb level is 14 - 18 g/dL for males and 12 - 16 g/dL for females.

Lower hemoglobin levels result in anemia, commonly iron deficiency, B12 deficiency or inherited, such as thalassemia. If you want to distinguish between thalassemia and iron deficiency anemia as the cause of low hemoglobin level, use Mentzer index.

Can you calculate hemoglobin from hematocrit?

The ratio of hematocrit to hemoglobin in healthy people is typically three to one. On this assumption, if you've only had your hemoglobin measured, you can estimate the hematocrit by multiplying it by 3. You can also convert the value of hematocrit to hemoglobin by dividing it by 3.

Knowing both hemoglobin and hematocrit, you can count an additional parameter - MCHC.

What is hematocrit to hemoglobin ratio?

It's a value that can help to identify a patient with hemoconcentration. This easily obtainable and cheap parameter detects a decrease in plasma volume, which causes a simultaneous increase in the concentration of red blood cells and other commonly tested constituents of the blood. Hemoconcentration can be induced internally as a function of the body’s natural physiology, or externally by specimen collection personnel.

The ratio is calculated using a simple equation:

ratio = Hct (%) / Hgb (g/dL)

The result can be interpreted using these reference ranges:

  • < 3.2 - normal;
  • 3.2 - 3.5 - suggestive of hemoconcentration;
  • > 3.5 - hemoconcentration.
Małgorzata Koperska, MD
Hematocrit (Hct)
Hemoglobin (Hgb)
Hct/Hgb ratio
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