Fitness & Health

Hematocrit and Hemoglobin Converter

Converts between hematocrit and hemoglobin using the rule of three, where HCT is roughly 3 times HGB. It also computes MCHC, flags normal ranges by sex, and checks whether the two values are consistent.

How to use
  1. Enter your hematocrit or hemoglobin value.
  2. Check the MCHC and normal-range flags.
  3. Switch sex to apply the right reference range.
Estimates for general wellness, not medical advice. Check with a doctor or dietitian before acting on health figures.
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Reference ranges

MeasureNormal range (male)Normal range (female)
Hemoglobin13.5-17.5 g/dL12.0-15.5 g/dL
Hematocrit41-50%36-48%

Common questions

What is the rule of three?

Hematocrit is about three times the hemoglobin value. So a hemoglobin of 14 g/dL maps to a hematocrit near 42 percent.

Is this a substitute for a lab test?

No. It's an estimate for quick checks, and abnormal numbers should be confirmed with an actual blood panel and a clinician.

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