Tumor markers

AFP unit converter

Alpha-fetoprotein (liver tumor and pregnancy marker)

Also known as: Alpha-fetoprotein, Alpha-foetoprotein, α-Fetoprotein, Alpha-1-fetoprotein, Alphafœtoprotéine, Alfafetoproteína

Converter

Enter a value in any unit and all other units fill in.

IU/mL ng/mL µg/dL ng/dL ng/L

Worked example

5 ng/mL (middle of the reference range) = 4.13 IU/mL

Conversion formulas

IU/mL	IU/mL = ng/mL × 0.8264	ng/mL = IU/mL × 1.21
µg/dL	µg/dL = ng/mL × 0.1	ng/mL = µg/dL × 10
ng/dL	ng/dL = ng/mL × 100	ng/mL = ng/dL × 0.01
ng/L	ng/L = ng/mL × 1000	ng/mL = ng/L × 0.001

Reference range

Unit	Adults
IU/mL	0.5785 – 7.686
ng/mL	0.7 – 9.3
µg/dL	0.07 – 0.93
ng/dL	70 – 930
ng/L	700 – 9300

Source: MedlinePlus (NLM): Alpha-fetoprotein · Last reviewed: 2026-10-14

Note from the source: Men and non-pregnant women 0.7-9.3 ng/mL (= µg/L) (MedlinePlus)

Frequently asked questions

How do I convert AFP from ng/mL to IU/mL?

IU/mL = ng/mL × 0.8264. In the other direction: ng/mL = IU/mL × 1.21.

What is the reference range of AFP?

For adults the range is 0.7 – 9.3 ng/mL (MedlinePlus (NLM): Alpha-fetoprotein). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for AFP?

Common units are IU/mL, ng/mL, µg/dL, ng/dL, ng/L.