Corrected Calcium unit converter
Convert corrected calcium between mg/dL and mmol/L. Type in either box. The factors come from our catalog and are checked by code.
AI-verified against cited sources. Awaiting expert reviewLast reviewed 2026-10-03
1 mg/dL = 0.2495 mmol/L. Nothing you type here leaves your browser.
The conversion
- 1 mg/dL = 0.2495 mmol/LFrom mg/dL to mmol/L: divide by 4.008. Back again: multiply by 4.008.
Mass and molar units are linked by the molecular weight: 40.08 g/mol (calcium (Ca), atomic weight). Source: PubChem, National Library of Medicine.
Common values
From zero to about twice the usual upper limit, plus the usual limits themselves.
| mg/dL | mmol/L |
|---|---|
| 2.5 | 0.62 |
| 5 | 1.25 |
| 7.5 | 1.87 |
| 8.6 | 2.15 |
| 8.7 | 2.17 |
| 10 | 2.5 |
| 10.2 | 2.54 |
| 10.3 | 2.57 |
| 12.5 | 3.12 |
| 15 | 3.74 |
| 17.5 | 4.37 |
| 20 | 4.99 |
Usual ranges in each unit
What labs print as the reference range, by who was tested. Sources for each range are on the Corrected Calcium page.
| Who | mg/dL | mmol/L |
|---|---|---|
| 18–59 | 8.7–10.2 | 2.17–2.54 |
| Men, 60+ | 8.6–10.2 | 2.15–2.54 |
| Women, 60+ | 8.7–10.3 | 2.17–2.57 |