How to Convert Albumin g/dL to g/L
Albumin is reported in g/dL in the US and g/L in most other countries. Both are mass-per-volume, so the conversion is a simple factor of 10 — the same relationship used for total protein.
Albumin g/L = albumin g/dL × 10 Albumin g/dL = albumin g/L ÷ 10 Albumin Conversion Chart
| g/dL | g/L | Context |
|---|---|---|
| 2.0 g/dL | 20 g/L | Low |
| 3.5 g/dL | 35 g/L | Lower normal |
| 4.0 g/dL | 40 g/L | Normal (formula reference) |
| 5.0 g/dL | 50 g/L | Upper normal |
Albumin Reference Ranges
| Category | g/dL | g/L |
|---|---|---|
| Low (hypoalbuminemia) | Below 3.5 g/dL | Below 35 g/L |
| Normal | 3.5 – 5.0 g/dL | 35 – 50 g/L |
Albumin-Corrected Calcium (Payne Formula)
About half of the calcium in blood is bound to albumin. So when albumin is low, the total calcium reads falsely low even if the active (ionized) calcium is normal. The corrected calcium estimates what the total would be at a normal albumin of 4.0 g/dL:
Corrected calcium = measured calcium + 0.8 × (4.0 − albumin g/dL) Corrected calcium = measured calcium + 0.02 × (40 − albumin g/L) In practice, each 1 g/dL that albumin sits below 4.0 adds about 0.8 mg/dL to the calcium. The normal corrected calcium range is 8.5–10.5 mg/dL (2.12–2.62 mmol/L). Where precision matters, a measured ionized calcium is more reliable than any correction. Convert calcium units on the calcium conversion calculator.
Worked Example
Measured calcium 8.0 mg/dL with a low albumin of 2.5 g/dL:
8.0 + 0.8 × (4.0 − 2.5) = 8.0 + 1.2 = 9.2 mg/dL The "low" 8.0 mg/dL corrects to a normal 9.2 mg/dL once the low albumin is accounted for.
Frequently Asked Questions
How do you convert albumin g/dL to g/L?
Multiply g/dL by 10. For example, 4.0 g/dL is 40 g/L.
What is a normal albumin level?
About 3.5–5.0 g/dL (35–50 g/L).
What is the corrected calcium formula?
Measured calcium + 0.8 × (4.0 − albumin g/dL).
Is corrected calcium accurate?
It is an estimate; a measured ionized calcium is more reliable.
References
- Payne albumin-corrected calcium formula (measured Ca + 0.8 × (4.0 − albumin g/dL)); SI form + 0.02 × (40 − albumin g/L).
- Albumin g/dL × 10 = g/L; normal albumin 3.5–5.0 g/dL; normal corrected calcium 8.5–10.5 mg/dL (standard clinical references).
Conclusion
Albumin converts between g/dL and g/L with a simple ×10. Its bigger role is correcting calcium: a low albumin makes total calcium look falsely low, and the Payne formula adjusts for it. For accuracy, pair it with an ionized calcium and your clinician's interpretation.