Corrected Calcium Calculator
Total calcium changes with albumin. This adjusts your measured calcium to what it would be at a normal albumin of 4.0 g/dL.
| Result | Interpretation |
|---|---|
| Below 8.5 | Low (hypocalcemia) |
| 8.5 to 10.3 | Normal |
| 10.3 and above | High (hypercalcemia) |
Source: Payne RB, Little AJ, Williams RB, Milner JR. Interpretation of serum calcium in patients with abnormal serum proteins. Br Med J 1973;4(5893):643-646. (doi:10.1136/bmj.4.5893.643)
This calculator runs entirely in your browser. Enable JavaScript to use the interactive version. Nothing you enter is sent to a server.
FAQs
Why correct calcium for albumin?
About half of the calcium in your blood is bound to albumin. When albumin is low, the measured total calcium can look low even when the active, free calcium is normal. Correcting for albumin gives a value that better reflects true calcium status.
What formula is used?
Corrected calcium in mg/dL equals the measured calcium plus 0.8 times the quantity 4.0 minus your albumin in g/dL.
What is a normal corrected calcium?
Roughly 8.5 to 10.2 mg/dL is considered normal. Values below or above that range should be interpreted by your physician, ideally with an ionized calcium where needed.