Albumin-Corrected Calcium Calculator

Corrected calcium = total calcium + 0.02 × (40 − albumin), with calcium in mmol/L and albumin in g/L. This is the simplified Payne equation.

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Calculation

Total calcium — Units
Albumin — Units

The result updates as you change the fields. Your data never leaves the browser.

This calculation is for reference only and is not medical advice, a diagnosis or a prescription. If you have a medical condition, are pregnant, take medication or have any doubts, discuss the result with a physician or a qualified nutrition professional.

Result

Albumin-corrected calcium
2.28 mmol/L (9.1 mg/dL)

The correction does not measure ionized calcium and can misclassify results, particularly with low albumin. No universal calcium category is assigned.

Uncorrected total calcium
2.12 mmol/L
Albumin
32.0 g/L

The correction does not measure ionized calcium and can misclassify results, particularly with low albumin. No universal calcium category is assigned. Reference ranges are population benchmarks from the cited sources. Laboratories use their own ranges, and interpretation depends on clinical context: discuss the result with your physician.

How it is calculated

Corrected calcium = total calcium + 0.02 × (40 − albumin), with calcium in mmol/L and albumin in g/L. This is the simplified Payne equation.

Formula

Corrected calcium = total calcium + 0.02 × (40 − albumin), with calcium in mmol/L and albumin in g/L. This is the simplified Payne equation. Ca: mg/dL × 0.2495 = mmol/L; mmol/L ÷ 0.2495 = mg/dL. Albumin: g/dL × 10 = g/L.

Limits of the method

The correction does not measure ionized calcium and can misclassify results, particularly with low albumin. No universal calcium category is assigned.

Sources of the method

How to use the calculation

1

Enter the starting values

Corrected calcium = total calcium + 0.02 × (40 − albumin), with calcium in mmol/L and albumin in g/L. This is the simplified Payne equation.

2

Adjust the parameters

Corrected calcium = total calcium + 0.02 × (40 − albumin), with calcium in mmol/L and albumin in g/L. This is the simplified Payne equation. Ca: mg/dL × 0.2495 = mmol/L; mmol/L ÷ 0.2495 = mg/dL. Albumin: g/dL × 10 = g/L.

3

Read the result

The correction does not measure ionized calcium and can misclassify results, particularly with low albumin. No universal calcium category is assigned.

Frequently asked questions

What does the calculation show?

Corrected calcium = total calcium + 0.02 × (40 − albumin), with calcium in mmol/L and albumin in g/L. This is the simplified Payne equation.

What limitations apply?

The correction does not measure ionized calcium and can misclassify results, particularly with low albumin. No universal calcium category is assigned.

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