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Haemoglobin: size, dimension and comparison

The adopted reference is about 5.5 nm.

Approximate diameter

nm means nanometer: a unit used for molecules and tiny features in computer chips. Imagine 1 millimeter split into one million equal pieces: one piece measures 1 nm.

This protein in red blood cells carries oxygen.

Explore at this scale
Haemoglobin, interpreted illustration
Interpreted illustration · dimension stated in the fact sheet.

What does this number measure?

This protein in red blood cells carries oxygen. Displayed dimension: approximate diameter.

Compare the stated dimensions

The comparison uses the number in each fact sheet: altitude, height, diameter, length or distance, depending on the reference. Two values in metres do not necessarily describe the same property.

Compare with Cell membrane in the explorer →

Source and limitations

Catalogue value to check against the source; not individually audited.

Haemoglobin: ribbon interpretation of its four subunits and their haem groups. Folding and molecular details are schematic, not derived from verified structural coordinates; approximate diameter.