Lab units · hemoglobin
Hemoglobin converter, g/dL to g/L.
Convert hemoglobin (Hb, Hgb) between g/dL (US), g/L (Canada, UK, Australia, Europe) and mmol/L (some European laboratories).
Convert a hemoglobin value
Result
Enter a hemoglobin value in either box.
How the conversion works
Hemoglobin is reported as mass per volume, so g/dL to g/L is simply × 10. Laboratories that report in mmol/L usually count haem iron: 1 g/dL = 0.6206 mmol/L based on a relative molecular mass of 16 114.5 per haem unit, so mmol/L = g/dL × 0.6206. Be aware that a few laboratories report mmol/L per whole tetramer (64 458 g/mol), which is one quarter of the figure; check the unit note on your report.
Worked example
13.5 g/dL = 135 g/L = 13.5 × 0.6206 = 8.38 mmol/L (iron basis).
Hemoglobin conversion chart
| g/dL | g/L | mmol/L (iron basis) |
|---|---|---|
| 8 g/dL | 80 g/L | 4.96 mmol/L |
| 10 g/dL | 100 g/L | 6.21 mmol/L |
| 12 g/dL | 120 g/L | 7.45 mmol/L |
| 13.5 g/dL | 135 g/L | 8.38 mmol/L |
| 15 g/dL | 150 g/L | 9.31 mmol/L |
| 17 g/dL | 170 g/L | 10.55 mmol/L |
Why there is no normal range here
Ranges depend on age, sex, pregnancy, altitude and the laboratory. The WHO publishes its anaemia thresholds in its 2024 haemoglobin guideline; this page converts units only and does not screen for anaemia.
Sources
Mass-to-molar factors follow standard clinical-chemistry unit tables, with the haem molecular mass from NIH PubChem (haem B).
Frequently asked questions
How do I convert hemoglobin from g/dL to g/L?
Multiply by 10. For example 12.5 g/dL is 125 g/L.
How do I convert g/dL to mmol/L?
Multiply by 0.6206 (iron basis). For example 14 g/dL is 8.69 mmol/L.
Is hematocrit the same unit?
No. Hematocrit is a percentage or a fraction (L/L), not a mass concentration, so it does not convert this way.
Do I have anaemia?
This page cannot say. Only a clinician with your full results can interpret them.
Reference information, not medical advice
This page converts units only. It does not interpret a result, and units and reference intervals differ between laboratories. Ask the clinician who ordered the test or the reporting laboratory what a result means for you. If you are worried about a result or symptoms, contact a health professional; in an emergency call your local emergency number.