HbA1c: % to mmol/mol
US labs print HbA1c as a percentage (NGSP), many European labs in mmol/mol (IFCC). To convert, subtract 2.15 from the percentage and multiply by 10.929; to go back, divide by 10.929 and add 2.15.
mmol/mol = (% − 2.15) × 10.929 · the IFCC–NGSP master equation
This converter changes units only. It doesn’t tell you whether a number is in or out of any range: that depends on the range printed by your own lab, and on your doctor. Soma does not diagnose and is not medical advice.
The formula
- % → mmol/mol
- mmol/mol = (% − 2.15) × 10.929
- mmol/mol → %
- % = mmol/mol ÷ 10.929 + 2.15
- Where it comes from
- The IFCC–NGSP master equation, which links the two standard ways of measuring HbA1c. It is not a molar mass: the two scales measure differently.
Estimated average glucose (eAG) from HbA1c
Some reports, and the American Diabetes Association, also express HbA1c as an estimated average glucose (eAG): the average blood sugar over the last 2–3 months that matches the HbA1c, in the units of a glucose meter. The line comes from the A1c-Derived Average Glucose (ADAG) study, which compared HbA1c with about three months of continuous and fingerstick glucose readings in 507 people.
eAG mg/dL = 28.7 × A1c − 46.7 · ADAG study
eAG is an estimate from a line fitted across many people: one person’s actual average glucose can differ from it. This converts HbA1c only; it doesn’t tell you whether a number is in or out of any range. Soma does not diagnose and is not medical advice.
- % → mg/dL
- eAG = 28.7 × A1c − 46.7
- % → mmol/L
- eAG = 1.59 × A1c − 2.59
- Where it comes from
- The ADAG study’s regression line (Nathan et al., Diabetes Care, 2008), which the American Diabetes Association uses for eAG. The mmol/L line is the same one divided by 18 (from glucose’s molar mass) and rounded, as the Soma app works out eAG.
| HbA1c | eAG, mg/dL | eAG, mmol/L |
|---|---|---|
| 5% | 96.8 mg/dL | 5.36 mmol/L |
| 5.5% | 111.1 mg/dL | 6.16 mmol/L |
| 6% | 125.5 mg/dL | 6.95 mmol/L |
| 6.5% | 139.8 mg/dL | 7.75 mmol/L |
| 7% | 154.2 mg/dL | 8.54 mmol/L |
| 7.5% | 168.6 mg/dL | 9.34 mmol/L |
| 8% | 182.9 mg/dL | 10.1 mmol/L |
| 8.5% | 197.2 mg/dL | 10.9 mmol/L |
| 9% | 211.6 mg/dL | 11.7 mmol/L |
| 9.5% | 225.9 mg/dL | 12.5 mmol/L |
| 10% | 240.3 mg/dL | 13.3 mmol/L |
| 10.5% | 254.6 mg/dL | 14.1 mmol/L |
| 11% | 269 mg/dL | 14.9 mmol/L |
| 11.5% | 283.4 mg/dL | 15.7 mmol/L |
| 12% | 297.7 mg/dL | 16.5 mmol/L |
Common values, converted
Straight conversions, rounded. The table doesn’t mark any value as normal or not; your lab’s report gives its own range.
| % | mmol/mol |
|---|---|
| 4 % | 20.2 mmol/mol |
| 4.5 % | 25.7 mmol/mol |
| 5 % | 31.1 mmol/mol |
| 5.5 % | 36.6 mmol/mol |
| 6 % | 42.1 mmol/mol |
| 6.5 % | 47.5 mmol/mol |
| 7 % | 53 mmol/mol |
| 7.5 % | 58.5 mmol/mol |
| 8 % | 63.9 mmol/mol |
| 8.5 % | 69.4 mmol/mol |
| 9 % | 74.9 mmol/mol |
| 9.5 % | 80.3 mmol/mol |
| 10 % | 85.8 mmol/mol |
| 10.5 % | 91.3 mmol/mol |
| 11 % | 96.7 mmol/mol |
| 11.5 % | 102.2 mmol/mol |
| 12 % | 107.7 mmol/mol |
| mmol/mol | % |
|---|---|
| 20 mmol/mol | 3.98 % |
| 30 mmol/mol | 4.89 % |
| 40 mmol/mol | 5.81 % |
| 50 mmol/mol | 6.72 % |
| 60 mmol/mol | 7.64 % |
| 70 mmol/mol | 8.55 % |
| 80 mmol/mol | 9.47 % |
| 90 mmol/mol | 10.4 % |
| 100 mmol/mol | 11.3 % |
| 110 mmol/mol | 12.2 % |
Show all 101 values: 4–14 % in mmol/mol
- 4 % = 20.2 mmol/mol
- 4.1 % = 21.3 mmol/mol
- 4.2 % = 22.4 mmol/mol
- 4.3 % = 23.5 mmol/mol
- 4.4 % = 24.6 mmol/mol
- 4.5 % = 25.7 mmol/mol
- 4.6 % = 26.8 mmol/mol
- 4.7 % = 27.9 mmol/mol
- 4.8 % = 29 mmol/mol
- 4.9 % = 30.1 mmol/mol
- 5 % = 31.1 mmol/mol
- 5.1 % = 32.2 mmol/mol
- 5.2 % = 33.3 mmol/mol
- 5.3 % = 34.4 mmol/mol
- 5.4 % = 35.5 mmol/mol
- 5.5 % = 36.6 mmol/mol
- 5.6 % = 37.7 mmol/mol
- 5.7 % = 38.8 mmol/mol
- 5.8 % = 39.9 mmol/mol
- 5.9 % = 41 mmol/mol
- 6 % = 42.1 mmol/mol
- 6.1 % = 43.2 mmol/mol
- 6.2 % = 44.3 mmol/mol
- 6.3 % = 45.4 mmol/mol
- 6.4 % = 46.4 mmol/mol
- 6.5 % = 47.5 mmol/mol
- 6.6 % = 48.6 mmol/mol
- 6.7 % = 49.7 mmol/mol
- 6.8 % = 50.8 mmol/mol
- 6.9 % = 51.9 mmol/mol
- 7 % = 53 mmol/mol
- 7.1 % = 54.1 mmol/mol
- 7.2 % = 55.2 mmol/mol
- 7.3 % = 56.3 mmol/mol
- 7.4 % = 57.4 mmol/mol
- 7.5 % = 58.5 mmol/mol
- 7.6 % = 59.6 mmol/mol
- 7.7 % = 60.7 mmol/mol
- 7.8 % = 61.7 mmol/mol
- 7.9 % = 62.8 mmol/mol
- 8 % = 63.9 mmol/mol
- 8.1 % = 65 mmol/mol
- 8.2 % = 66.1 mmol/mol
- 8.3 % = 67.2 mmol/mol
- 8.4 % = 68.3 mmol/mol
- 8.5 % = 69.4 mmol/mol
- 8.6 % = 70.5 mmol/mol
- 8.7 % = 71.6 mmol/mol
- 8.8 % = 72.7 mmol/mol
- 8.9 % = 73.8 mmol/mol
- 9 % = 74.9 mmol/mol
- 9.1 % = 76 mmol/mol
- 9.2 % = 77 mmol/mol
- 9.3 % = 78.1 mmol/mol
- 9.4 % = 79.2 mmol/mol
- 9.5 % = 80.3 mmol/mol
- 9.6 % = 81.4 mmol/mol
- 9.7 % = 82.5 mmol/mol
- 9.8 % = 83.6 mmol/mol
- 9.9 % = 84.7 mmol/mol
- 10 % = 85.8 mmol/mol
- 10.1 % = 86.9 mmol/mol
- 10.2 % = 88 mmol/mol
- 10.3 % = 89.1 mmol/mol
- 10.4 % = 90.2 mmol/mol
- 10.5 % = 91.3 mmol/mol
- 10.6 % = 92.4 mmol/mol
- 10.7 % = 93.4 mmol/mol
- 10.8 % = 94.5 mmol/mol
- 10.9 % = 95.6 mmol/mol
- 11 % = 96.7 mmol/mol
- 11.1 % = 97.8 mmol/mol
- 11.2 % = 98.9 mmol/mol
- 11.3 % = 100 mmol/mol
- 11.4 % = 101.1 mmol/mol
- 11.5 % = 102.2 mmol/mol
- 11.6 % = 103.3 mmol/mol
- 11.7 % = 104.4 mmol/mol
- 11.8 % = 105.5 mmol/mol
- 11.9 % = 106.6 mmol/mol
- 12 % = 107.7 mmol/mol
- 12.1 % = 108.7 mmol/mol
- 12.2 % = 109.8 mmol/mol
- 12.3 % = 110.9 mmol/mol
- 12.4 % = 112 mmol/mol
- 12.5 % = 113.1 mmol/mol
- 12.6 % = 114.2 mmol/mol
- 12.7 % = 115.3 mmol/mol
- 12.8 % = 116.4 mmol/mol
- 12.9 % = 117.5 mmol/mol
- 13 % = 118.6 mmol/mol
- 13.1 % = 119.7 mmol/mol
- 13.2 % = 120.8 mmol/mol
- 13.3 % = 121.9 mmol/mol
- 13.4 % = 123 mmol/mol
- 13.5 % = 124 mmol/mol
- 13.6 % = 125.1 mmol/mol
- 13.7 % = 126.2 mmol/mol
- 13.8 % = 127.3 mmol/mol
- 13.9 % = 128.4 mmol/mol
- 14 % = 129.5 mmol/mol
Show all 111 values: 20–130 mmol/mol in %
- 20 mmol/mol = 3.98 %
- 21 mmol/mol = 4.07 %
- 22 mmol/mol = 4.16 %
- 23 mmol/mol = 4.25 %
- 24 mmol/mol = 4.35 %
- 25 mmol/mol = 4.44 %
- 26 mmol/mol = 4.53 %
- 27 mmol/mol = 4.62 %
- 28 mmol/mol = 4.71 %
- 29 mmol/mol = 4.8 %
- 30 mmol/mol = 4.89 %
- 31 mmol/mol = 4.99 %
- 32 mmol/mol = 5.08 %
- 33 mmol/mol = 5.17 %
- 34 mmol/mol = 5.26 %
- 35 mmol/mol = 5.35 %
- 36 mmol/mol = 5.44 %
- 37 mmol/mol = 5.54 %
- 38 mmol/mol = 5.63 %
- 39 mmol/mol = 5.72 %
- 40 mmol/mol = 5.81 %
- 41 mmol/mol = 5.9 %
- 42 mmol/mol = 5.99 %
- 43 mmol/mol = 6.08 %
- 44 mmol/mol = 6.18 %
- 45 mmol/mol = 6.27 %
- 46 mmol/mol = 6.36 %
- 47 mmol/mol = 6.45 %
- 48 mmol/mol = 6.54 %
- 49 mmol/mol = 6.63 %
- 50 mmol/mol = 6.72 %
- 51 mmol/mol = 6.82 %
- 52 mmol/mol = 6.91 %
- 53 mmol/mol = 7 %
- 54 mmol/mol = 7.09 %
- 55 mmol/mol = 7.18 %
- 56 mmol/mol = 7.27 %
- 57 mmol/mol = 7.37 %
- 58 mmol/mol = 7.46 %
- 59 mmol/mol = 7.55 %
- 60 mmol/mol = 7.64 %
- 61 mmol/mol = 7.73 %
- 62 mmol/mol = 7.82 %
- 63 mmol/mol = 7.91 %
- 64 mmol/mol = 8.01 %
- 65 mmol/mol = 8.1 %
- 66 mmol/mol = 8.19 %
- 67 mmol/mol = 8.28 %
- 68 mmol/mol = 8.37 %
- 69 mmol/mol = 8.46 %
- 70 mmol/mol = 8.55 %
- 71 mmol/mol = 8.65 %
- 72 mmol/mol = 8.74 %
- 73 mmol/mol = 8.83 %
- 74 mmol/mol = 8.92 %
- 75 mmol/mol = 9.01 %
- 76 mmol/mol = 9.1 %
- 77 mmol/mol = 9.2 %
- 78 mmol/mol = 9.29 %
- 79 mmol/mol = 9.38 %
- 80 mmol/mol = 9.47 %
- 81 mmol/mol = 9.56 %
- 82 mmol/mol = 9.65 %
- 83 mmol/mol = 9.74 %
- 84 mmol/mol = 9.84 %
- 85 mmol/mol = 9.93 %
- 86 mmol/mol = 10 %
- 87 mmol/mol = 10.1 %
- 88 mmol/mol = 10.2 %
- 89 mmol/mol = 10.3 %
- 90 mmol/mol = 10.4 %
- 91 mmol/mol = 10.5 %
- 92 mmol/mol = 10.6 %
- 93 mmol/mol = 10.7 %
- 94 mmol/mol = 10.8 %
- 95 mmol/mol = 10.8 %
- 96 mmol/mol = 10.9 %
- 97 mmol/mol = 11 %
- 98 mmol/mol = 11.1 %
- 99 mmol/mol = 11.2 %
- 100 mmol/mol = 11.3 %
- 101 mmol/mol = 11.4 %
- 102 mmol/mol = 11.5 %
- 103 mmol/mol = 11.6 %
- 104 mmol/mol = 11.7 %
- 105 mmol/mol = 11.8 %
- 106 mmol/mol = 11.8 %
- 107 mmol/mol = 11.9 %
- 108 mmol/mol = 12 %
- 109 mmol/mol = 12.1 %
- 110 mmol/mol = 12.2 %
- 111 mmol/mol = 12.3 %
- 112 mmol/mol = 12.4 %
- 113 mmol/mol = 12.5 %
- 114 mmol/mol = 12.6 %
- 115 mmol/mol = 12.7 %
- 116 mmol/mol = 12.8 %
- 117 mmol/mol = 12.9 %
- 118 mmol/mol = 12.9 %
- 119 mmol/mol = 13 %
- 120 mmol/mol = 13.1 %
- 121 mmol/mol = 13.2 %
- 122 mmol/mol = 13.3 %
- 123 mmol/mol = 13.4 %
- 124 mmol/mol = 13.5 %
- 125 mmol/mol = 13.6 %
- 126 mmol/mol = 13.7 %
- 127 mmol/mol = 13.8 %
- 128 mmol/mol = 13.9 %
- 129 mmol/mol = 14 %
- 130 mmol/mol = 14 %
About the test
HbA1c, glycated hemoglobin, reflects the average blood sugar over the last 2–3 months. It does not depend on breakfast.
About the HbA1c test · Hemoglobin A1C (HbA1c) Test — MedlinePlus (U.S. National Library of Medicine).
Questions
How do I convert HbA1c from % to mmol/mol?
Subtract 2.15 and multiply by 10.929. For example, (6.5 − 2.15) × 10.929 = 47.5 mmol/mol.
How do I convert HbA1c from mmol/mol to %?
Divide by 10.929 and add 2.15. For example, 48 ÷ 10.929 + 2.15 = 6.54%.
Why isn’t it a simple multiplication?
The percentage (NGSP) and mmol/mol (IFCC) come from different reference methods, so the two scales are linked by a straight line with an offset, the IFCC–NGSP master equation.
How do I convert HbA1c to estimated average glucose?
Multiply the HbA1c percentage by 28.7 and subtract 46.7 to get mg/dL; for mmol/L, multiply by 1.59 and subtract 2.59. For example, an HbA1c of 7% matches an eAG of about 154.2 mg/dL (8.54 mmol/L).
Related conversions
Soma converts straight from the PDF
Share a lab report to Soma, and it reads every row on your phone and converts the units for you, so a Quest result in mg/dL and a Synlab result in mmol/L sit on one chart, each against its own lab’s range. No account, nothing uploaded.
Sources: the IFCC–NGSP master equation, as the Soma app converts; the test description from MedlinePlus. Mention of a source doesn’t mean it endorses Soma.