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Electrolytes & minerals

Ionized calcium: convert mmol/L to mg/dL

mg/dL = mmol/L × 4.008

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

Conversion formulas

mmol/L → mg/dLmg/dL = mmol/L × 4.008
mg/dL → mmol/Lmmol/L = mg/dL × 0.2495

Conversion table

Highlighted: values inside the adult reference range.

mmol/Lmg/dL
0.20.8016
0.41.603
0.62.405
0.83.206
14.008
1.24.81
1.45.611
1.66.413
1.87.214
28.016
2.28.818
2.49.619
2.610.42
2.811.22
312.02
3.212.83

Reference range

1.2 – 1.4 mmol/L = 4.81 – 5.611 mg/dL

Source: MedlinePlus (NLM): Calcium - ionized · Last reviewed: 2026-10-14

Frequently asked questions

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

mg/dL = mmol/L × 4.008. For example, 1.2 mmol/L equals 4.81 mg/dL.

How many mg/dL are 1.2 mmol/L?

1.2 mmol/L equal 4.81 mg/dL (Ionized calcium).

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

mmol/L = mg/dL × 0.2495.

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