Hematocrit / Hemoglobin Ratio Calculator

Created by Małgorzata Koperska, MD
Reviewed by Bogna Szyk and Dominika Śmiałek, MD, PhD candidate
Based on research by
Weatherall, M.S.; Sherry, K.M. An evaluation of the Spuncrit infra-red analyser for measurement of haematocrit Clinical and Laboratory Haematology (September 1997)
Last updated: Jan 11, 2023

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.

Disclaimer: We try our best to make our Omni Calculators as precise and reliable as possible. However, this tool can never replace professional medical advice.

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 values of 40-54% for adult males and 36-48% for females. It is assumed that the rest of the full blood volume is plasma. Visit our plasma volume calculator to learn more.

  • Hemoglobin is a protein in red blood cells responsible for delivering oxygen to the tissues, typically measured in g/dL. The expected Hb level is 14-18 g/dL for males and 12-16 g/dL for females.

Lower hemoglobin levels (anemia) commonly result from iron deficiency, B12 deficiency, or may be inherited, such as thalassemia. If you want to distinguish between thalassemia and iron deficiency anemia as the cause of low hemoglobin levels, use mentzer index calculator.

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 calculate an additional parameter – MCHC. To do this, you can use our RBC indices calculator.

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 blood constituents.

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)

We interpret the result using these reference ranges:

  • < 3.2 – Normal;
  • 3.2-3.5 – Suggestive of hemoconcentration; and
  • > 3.5 – Hemoconcentration.
Małgorzata Koperska, MD
Hematocrit (Hct)
Hemoglobin (Hgb)
Hct/Hgb ratio
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