Electrolytes & minerals

Potassium unit converter

Electrolyte and nerve function

Also known as: K, Serum potassium, Kalemia, Kaliémie, Potasio, Potassio

Converter

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

g/L mmol/L = mEq/L mg/dL mg/L µmol/L

Worked example

4.4 mmol/L (middle of the reference range) = 17.2 mg/dL

Conversion formulas

g/L	g/L = mmol/L × 0.03909	mmol/L = g/L × 25.58
mg/dL	mg/dL = mmol/L × 3.909	mmol/L = mg/dL × 0.2558
mg/L	mg/L = mmol/L × 39.1	mmol/L = mg/L × 0.02558
µmol/L	µmol/L = mmol/L × 1000	mmol/L = µmol/L × 0.001

Reference range

Unit	Adults
g/L	0.1368 – 0.2072
mmol/L = mEq/L	3.5 – 5.3
mg/dL	13.68 – 20.72
mg/L	136.8 – 207.2
µmol/L	3500 – 5300

Source: Pathology Harmony Group (ACB, IBMS, RCPath): Agreed Adult Clinical Biochemistry Reference Intervals, January 2011 · Last reviewed: 2026-10-14

Note from the source: 3.5-5.3 mmol/L. UK Pathology Harmony consensus of the Association for Clinical Biochemistry, the Institute of Biomedical Science and the Royal College of Pathologists.

Frequently asked questions

How do I convert Potassium from mmol/L to mg/dL?

mg/dL = mmol/L × 3.909. In the other direction: mmol/L = mg/dL × 0.2558.

What is the reference range of Potassium?

For adults the range is 3.5 – 5.3 mmol/L (Pathology Harmony Group (ACB, IBMS, RCPath): Agreed Adult Clinical Biochemistry Reference Intervals, January 2011). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for Potassium?

Common units are g/L, mmol/L, mg/dL, mg/L, µmol/L.