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Electrolytes & minerals

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
0.52.004
14.008
1.56.012
28.016
2.510.02
312.02
3.514.03
416.03
4.518.04
520.04
5.522.04
624.05
6.526.05

Reference range

2.2 – 2.6 mmol/L = 8.818 – 10.42 mg/dL

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 Calcium from mmol/L to mg/dL?

mg/dL = mmol/L × 4.008. For example, 2.5 mmol/L equals 10 mg/dL.

How many mg/dL are 2.5 mmol/L?

2.5 mmol/L equal 10 mg/dL (Calcium).

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

mmol/L = mg/dL × 0.2495.

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