Hematocrit to Hemoglobin Ratio (HCT/HGB) Calculator

Your details

Choose whether to compute the ratio from both values, or to estimate one value from the other using the standard 3x rule.
The percentage of red blood cells by volume in whole blood. Typical adult range is 36-50%.
%
The concentration of hemoglobin protein in blood. Typical adult range is 12-17 g/dL.
g/dL
Used to show the appropriate normal HCT and HGB reference ranges alongside your result.
HCT/HGB RatioNormal ratio
3

Hematocrit (%) divided by hemoglobin (g/dL). Normal range is approximately 2.8-3.2.

HCT used42%
HGB used14g/dL
Normal HCT (low)41%
Normal HCT (high)50%
3
Low (high MCHC)<2.5Low-normal2.5-2.8Normal2.8-3.2Borderline high3.2-3.5High (hypochromia)3.5+

Your HCT/HGB ratio is 3.00, which is within the normal range.

  • The expected ratio in a healthy person is close to 3.0, often called the "3x rule" in clinical practice. Your result indicates consistent HCT and HGB measurements with no strong evidence of red blood cell size abnormality.
  • For reference, normal hematocrit for adult males is roughly 41-50%.

Next stepContinue routine monitoring as recommended by your healthcare provider. A normal ratio is reassuring but should be interpreted alongside the full CBC and clinical context.

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