Calcium: mg/dL to mmol/L
Convert Calcium between mg/dL and mmol/L — Serum calcium is reported in mg/dL in the US and mmol/L elsewhere. Type in either box to convert both ways.
9 mg/dL of Calcium = 2.25 mmol/L
Total calcium; often adjusted for albumin. General adult guide — the reference range printed on your own lab report is the one that applies to you.
Calcium conversion table (mg/dL to mmol/L)
| Calcium (mg/dL) | Calcium (mmol/L) |
|---|---|
| 7 mg/dL | 1.75 mmol/L |
| 8 mg/dL | 2 mmol/L |
| 8.5 mg/dL | 2.12 mmol/L |
| 9 mg/dL | 2.25 mmol/L |
| 10 mg/dL | 2.5 mmol/L |
| 10.5 mg/dL | 2.62 mmol/L |
| 11 mg/dL | 2.74 mmol/L |
How to convert Calcium from mg/dL to mmol/L
To convert Calcium, multiply mg/dL by 0.2495 — calcium has an atomic mass of 40.08 g/mol. For example, 1 mg/dL equals 0.25 mmol/L. The converter above runs the exact factor at full precision and updates as you type; the swap button flips the direction.
Frequently asked questions
How do you convert Calcium from mg/dL to mmol/L?
Multiply mg/dL by 0.2495 — calcium has an atomic mass of 40.08 g/mol. For example, 1 mg/dL is 0.25 mmol/L. The converter above does this instantly and works both ways — type a value in either box. It uses the exact factor at full precision, so the result matches published clinical conversions.
What is a normal Calcium level?
Typical total serum calcium is about 8.6–10.2 mg/dL (2.15–2.55 mmol/L); it is often adjusted for albumin. These are general adult figures only — the reference interval on your own lab report is what applies to you, and it can differ by lab, method, age and sex. The conversion table above runs from 7 to 11 mg/dL, or 1.75 to 2.74 mmol/L, so a range quoted in either system can be lined up against your own figure.
Why is Calcium reported in different units?
Serum calcium is reported in mg/dL in the US and mmol/L elsewhere. The two systems describe the same measurement, so a value converts exactly from one to the other with no loss of meaning — only the units and the number change. That is why guidelines, journals and lab reports from different countries quote different numbers for the same Calcium result. The two boxes above are labelled mg/dL and mmol/L, so you can read a value in whichever system your own report uses.
Is this Calcium converter accurate and free?
Yes — this Calcium converter is both accurate and free. It applies the standard, published conversion factor at full double precision in your browser, with nothing uploaded or stored, and there is no sign-up or usage limit. It converts units only and does not interpret or diagnose results.
This is a unit-conversion reference tool, not a diagnosis or medical advice. Reference intervals are general adult guides that vary by laboratory, method and individual — always read your result against the range printed on your own report and discuss it with a qualified healthcare professional.
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