8.69
mmol/L
140
g/L
16,114
g/mol
8.69
mmol/L
140
g/L
16,114
g/mol
The Hemoglobin Converter converts hemoglobin (Hb) concentrations between g/dL (grams per deciliter), mmol/L (millimoles per liter), and g/L (grams per liter). Hemoglobin is the oxygen-carrying protein in red blood cells, and its measurement is one of the most commonly ordered blood tests worldwide, essential for diagnosing anemia, polycythemia, and monitoring overall blood health.
Hemoglobin measurement units vary globally. The United States and many other countries report hemoglobin in g/dL. Some European countries and international guidelines increasingly use mmol/L, while SI unit advocates prefer g/L. The conversions between these units are straightforward but important for accurate medical interpretation.
The conversion factor from g/dL to mmol/L is 0.6206. This factor is based on the molecular weight of the hemoglobin monomer (approximately 16,114 g/mol or 16.114 kg/mol). Since hemoglobin exists as a tetramer in blood, some sources use the tetramer molecular weight (64,458 g/mol), giving a factor of 0.1551. The monomer-based factor (0.6206) is the more commonly used clinical convention. The g/dL to g/L conversion is simply x 10.
Normal hemoglobin ranges are: Men: 13.5-17.5 g/dL (8.4-10.9 mmol/L), Women: 12.0-16.0 g/dL (7.4-9.9 mmol/L). Anemia is diagnosed when hemoglobin falls below the normal range — below 13.5 g/dL in men or 12.0 g/dL in women. Causes include iron deficiency, chronic disease, blood loss, bone marrow disorders, and nutritional deficiencies.
This converter includes a reference category: 1 = Below normal range (possible anemia), 2 = Normal range, 3 = Above normal range (possible polycythemia). Using the general threshold of 12 g/dL as the low boundary and 17.5 g/dL as the high boundary. These are broad guidelines — your healthcare provider will interpret your results based on your sex, age, altitude of residence, and clinical context.
The formulas are: mmol/L = g/dL x 0.6206 (monomer basis). g/L = g/dL x 10. The reverse: g/dL = mmol/L / 0.6206. The factor 0.6206 = 10 / 16.114 (molecular weight of hemoglobin monomer in kDa). Reference: 1 = Low (<12 g/dL), 2 = Normal (12-17.5 g/dL), 3 = High (>17.5 g/dL).
Normal hemoglobin varies by sex (men typically higher), age, altitude, and pregnancy status. The monomer-based mmol/L conversion (factor 0.6206) is the standard clinical convention. Some labs report using the tetramer basis (factor 0.1551), so always check which convention your lab uses. Values in g/L are simply g/dL multiplied by 10.
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Results
15.0 g/dL = 9.31 mmol/L = 150 g/L (Normal)
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Results
10.5 g/dL = 6.52 mmol/L = 105 g/L (Low)
Multiply the g/dL value by 0.6206. For example, 14.0 g/dL x 0.6206 = 8.69 mmol/L. This uses the hemoglobin monomer molecular weight convention.
Normal hemoglobin is 13.5-17.5 g/dL (8.4-10.9 mmol/L) for adult men and 12.0-16.0 g/dL (7.4-9.9 mmol/L) for adult women. Children and pregnant women have different reference ranges.
Hemoglobin is a tetramer of 4 subunits. The monomer-based conversion (factor 0.6206) counts each subunit separately and is the more common clinical convention. The tetramer-based conversion (factor 0.1551) counts the whole molecule. Results differ by a factor of 4. Always check which convention your lab uses.
Anemia is a condition where hemoglobin is below normal, reducing the blood's oxygen-carrying capacity. Symptoms include fatigue, weakness, shortness of breath, pale skin, and dizziness. It has many causes including iron deficiency, vitamin B12 deficiency, chronic disease, and blood loss.
Simply multiply by 10. For example, 14.0 g/dL = 140 g/L. This is just a decimal shift, as 1 dL = 0.1 L.
Yes. People living at high altitudes have naturally higher hemoglobin levels because the body produces more red blood cells to compensate for lower oxygen pressure. Normal hemoglobin at 5,000+ feet elevation may be 1-2 g/dL higher than at sea level.
Hemoglobin measures the actual protein concentration in blood. Hematocrit measures the percentage of blood volume occupied by red blood cells. They are related: hematocrit is roughly 3 times the hemoglobin value (e.g., Hb 14 g/dL = Hct ~42%).
Yes. Elevated hemoglobin (above 17.5 g/dL in men, 16.0 g/dL in women at sea level) may indicate polycythemia vera (a bone marrow disorder), dehydration, chronic hypoxia (from lung disease or high altitude), or doping with erythropoietin (EPO).
Hemoglobin is measured as part of a Complete Blood Count (CBC), the most commonly ordered blood test. It requires a venous blood sample. Point-of-care hemoglobin meters can also measure it from a fingerstick sample.
If anemia is due to iron deficiency, iron supplementation typically raises hemoglobin by about 1-2 g/dL over 2-4 weeks. Oral iron is the first-line treatment; IV iron is used for severe deficiency or malabsorption. Response confirms iron deficiency as the cause.
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