Iron & vitamins

Folate unit converter

Vitamin B9 level

Also known as: Folic acid, Vitamin B9, Serum folate, Folat, Folates, Acide folique

Converter

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

ng/mL nmol/L µg/dL ng/dL ng/L

Worked example

22.3 nmol/L (middle of the reference range) = 9.84 ng/mL

Conversion formulas

ng/mL	ng/mL = nmol/L × 0.4413	nmol/L = ng/mL × 2.266
µg/dL	µg/dL = nmol/L × 0.04414	nmol/L = µg/dL × 22.66
ng/dL	ng/dL = nmol/L × 44.14	nmol/L = ng/dL × 0.02266
ng/L	ng/L = nmol/L × 441.4	nmol/L = ng/L × 0.002266

Reference range

Unit	Adults
ng/mL	2.692 – 16.99
nmol/L	6.1 – 38.5
µg/dL	0.2693 – 1.699
ng/dL	269.3 – 1699
ng/L	2693 – 16 994

Source: MedlinePlus (NLM): Folic acid - test · Last reviewed: 2026-10-14

Note from the source: 2.7-17.0 ng/mL (6.12-38.52 nmol/L) (MedlinePlus)

Frequently asked questions

How do I convert Folate from nmol/L to ng/mL?

ng/mL = nmol/L × 0.4413. In the other direction: nmol/L = ng/mL × 2.266.

What is the reference range of Folate?

For adults the range is 6.1 – 38.5 nmol/L (MedlinePlus (NLM): Folic acid - test). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for Folate?

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