Electrolytes & minerals

Sodium unit converter

Electrolyte balance

Also known as: Na, Serum sodium, Natremia, Natrémie, Sodio

Converter

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

g/L mmol/L = mEq/L mg/dL g/dL mg/L

Worked example

140 mmol/L (middle of the reference range) = 322 mg/dL

Conversion formulas

g/L	g/L = mmol/L × 0.02299	mmol/L = g/L × 43.49
mg/dL	mg/dL = mmol/L × 2.299	mmol/L = mg/dL × 0.4349
g/dL	g/dL = mmol/L × 0.002299	mmol/L = g/dL × 435
mg/L	mg/L = mmol/L × 22.99	mmol/L = mg/L × 0.0435

Reference range

Unit	Adults
g/L	3.104 – 3.334
mmol/L = mEq/L	135 – 145
mg/dL	310.4 – 333.4
g/dL	0.3104 – 0.3334
mg/L	3104 – 3334

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

Note from the source: 135-145 mEq/L (= mmol/L); ranges vary slightly between laboratories (MedlinePlus)

Frequently asked questions

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

mg/dL = mmol/L × 2.299. In the other direction: mmol/L = mg/dL × 0.4349.

What is the reference range of Sodium?

For adults the range is 135 – 145 mmol/L (MedlinePlus (NLM): Sodium 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 Sodium?

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