Iron & vitamins

Methylmalonic acid unit converter

Rises in vitamin B12 deficiency; also elevated in kidney disease

Also known as: MMA

Converter

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

mg/L µmol/L nmol/L µg/dL µg/L ng/dL

Worked example

0.17 µmol/L (middle of the reference range) = 0.0201 mg/L

Conversion formulas

mg/L	mg/L = µmol/L × 0.1181	µmol/L = mg/L × 8.469
nmol/L	nmol/L = µmol/L × 1000	µmol/L = nmol/L × 0.001
µg/dL	µg/dL = µmol/L × 11.81	µmol/L = µg/dL × 0.08468
µg/L	µg/L = µmol/L × 118.1	µmol/L = µg/L × 0.008468
ng/dL	ng/dL = µmol/L × 11 809	µmol/L = ng/dL × 0

Reference range

Unit	Adults
mg/L	0.0083 – 0.0319
µmol/L	0.07 – 0.27
nmol/L	70 – 270
µg/dL	0.8266 – 3.188
µg/L	8.266 – 31.88
ng/dL	826.6 – 3188

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

Note from the source: 0.07-0.27 µmol/L (MedlinePlus)

Frequently asked questions

How do I convert Methylmalonic acid from µmol/L to mg/L?

mg/L = µmol/L × 0.1181. In the other direction: µmol/L = mg/L × 8.469.

What is the reference range of Methylmalonic acid?

For adults the range is 0.07 – 0.27 µmol/L (MedlinePlus (NLM): Methylmalonic acid blood 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 Methylmalonic acid?

Common units are mg/L, µmol/L, nmol/L, µg/dL, µg/L, ng/dL.