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Electrolytes & minerals

Phosphate: convert mg/dL to mmol/L

mmol/L = mg/dL × 0.3229

Calculator

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

Conversion formulas

mg/dL → mmol/Lmmol/L = mg/dL × 0.3229
mmol/L → mg/dLmg/dL = mmol/L × 3.097

Conversion table

Highlighted: values inside the adult reference range.

mg/dLmmol/L
10.3229
20.6458
30.9687
41.292
51.615
61.937
72.26
82.583
92.906
103.229
113.552

Reference range

2.478 – 4.645 mg/dL = 0.8 – 1.5 mmol/L

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

Frequently asked questions

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

mmol/L = mg/dL × 0.3229. For example, 4 mg/dL equals 1.29 mmol/L.

How many mmol/L are 4 mg/dL?

4 mg/dL equal 1.29 mmol/L (Phosphate).

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

mg/dL = mmol/L × 3.097.

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