Laboratory Medicine · Internal Medicine

Calcium mg/dL to mmol/L calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Calcium (mg/dL)

mg/dL

Allowed range: 0.001–99999 mg/dL

Result

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Clinical inputs

Calcium (mg/dL)Accepted range: 0.001 to 99999

Primary source

Labcorp SI Unit Conversion Table (Conventional to SI / SI to Conventional columns). Calcium, serum or ionized: mg/dL × 0.25 = mmol/L; mmol/L × 4 = mg/dL. This calculator divides by 4.008, from the atomic mass of calcium (40.08 g/mol). (2026)

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