Corrected Calcium Calculator

Your details

The total serum calcium from your blood panel.
mg/dL
A normal albumin is about 4.0 g/dL (40 g/L). Low albumin pulls total calcium down.
g/dL
Adds a rough estimate of the free, biologically active ionized calcium.
Adjust the correction constant and the target (reference) albumin used by the formula.
Corrected calciumNormal range
9.6mg/dL

Calcium adjusted to a normal albumin (4.0 g/dL by default).

Adjustment applied1.2mg/dL
Estimated ionized calcium1.13mmol/L
9.6 mg/dL
Low<8.5Normal8.5-10.2High10.2+

Your albumin-corrected calcium is about 9.6 mg/dL.

  • The correction added 1.2 mg/dL to your measured value to account for the albumin level.
  • Correcting matters because total calcium reads falsely low when albumin (which binds ~40% of calcium) is low, and falsely high when albumin is high.
  • Estimated ionized (free, active) calcium is about 1.13 mmol/L; normal is roughly 1.16-1.32 mmol/L. This is only an estimate.
  • Your corrected calcium sits inside the normal range, so a low total reading was likely driven by albumin rather than true calcium deficiency.

Next stepCompare the corrected value to your lab reference range and discuss abnormal results with your clinician; order a direct ionized calcium when accuracy matters.

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