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Health Calculators

Corrected Calcium Calculator

Verified formula Updated Jun 2026 Private — runs on your device

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mg/dL
g/dL
Verified formula Private

Corrected calcium

9.20

For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.

How to use the Corrected Calcium Calculator

The Corrected Calcium Calculator works out your corrected calcium in an instant. Enter measured calcium and serum albumin and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.

  1. Enter the measured calcium.
  2. Enter the serum albumin.
  3. Read off your corrected calcium — the calculator updates automatically, with no button to press.

Formula

The Corrected Calcium Calculator uses the formula:

Corrected calcium = Measured calcium + 0.8 × (4 - Serum albumin)

Worked example

For example, with measured calcium of 8 mg/dL and serum albumin of 2.5 g/dL, the corrected calcium is 9.20.

Inputs used
Measured calcium 8 mg/dL
Serum albumin 2.5 g/dL
Results
Corrected calcium 9.20

Results are estimates for educational use, not professional advice.

Frequently asked questions

Much of the blood calcium is bound to albumin. When albumin is low, total calcium reads low even if active calcium is normal, so it is corrected.

Corrected calcium = measured calcium + 0.8 × (4 − albumin), with albumin in g/dL and calcium in mg/dL.

The formula uses a normal albumin of 4.0 g/dL as the baseline for correction.

No. Where precise calcium status matters, a direct ionised calcium measurement is preferred over correction.

Enter the measured calcium. Enter the serum albumin. Read off your corrected calcium — the calculator updates automatically, with no button to press.

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