Hematocrit / Hemoglobin Ratio Calculator

By Małgorzata Koperska, MD
Last updated: Jul 07, 2018

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.

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.

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
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