A1c 6.1%
A1c of 6.1%: what it means
An A1c of 6.1% is in the middle of the prediabetes range (5.7% to 6.4%).
Average glucose from the ADAG formula, eAG = 28.7 × A1c − 46.7 (Nathan 2008). Categories from the ADA Standards of Care (ADA Standards 2026, sec. 2).
What an A1c of 6.1% means
- The ADA defines prediabetes by A1c as 5.7% to 6.4%, and diabetes as 6.5% or higher. (ADA Standards 2026, sec. 2)
- Within the prediabetes range of 5.7% to 6.4%, the higher the A1c, the higher the risk of developing type 2 diabetes. (NIDDK)
- Without symptoms, a result in the prediabetes or diabetes range is usually repeated on a different day, with A1c or another glucose test, before a diagnosis is made. (NIDDK)
- In the Diabetes Prevention Program trial, adults with raised glucose who joined an intensive lifestyle program (weight loss and about 150 minutes of activity a week) developed type 2 diabetes 58% less often than the placebo group over an average of 2.8 years. (DPP 2002)
- Large changes in blood glucose over the past month show up in the A1c, but short spikes and dips do not. The most recent 30 days count more than earlier months. (NIDDK)
An A1c of 6.1% is 0.4 points below the diabetes threshold of 6.5% (140 mg/dL) and 0.5 points above the top of the normal range.
Questions to ask your doctor
- Should this result be confirmed with a repeat A1c or a different glucose test?
- When should I be tested again?
- Is a lifestyle change program, such as a diabetes prevention program, a good fit for me?
- Could anything make my A1c less accurate, such as anemia or a hemoglobin variant?
Nearby values
| A1c | mg/dL | mmol/L | Category |
|---|---|---|---|
| 5.6% | 114 | 6.3 | Normal |
| 5.7% | 117 | 6.5 | Prediabetes |
| 5.8% | 120 | 6.6 | Prediabetes |
| 5.9% | 123 | 6.8 | Prediabetes |
| 6.0% | 126 | 7.0 | Prediabetes |
| 6.1% | 128 | 7.1 | Prediabetes |
| 6.2% | 131 | 7.3 | Prediabetes |
| 6.3% | 134 | 7.4 | Prediabetes |
| 6.4% | 137 | 7.6 | Prediabetes |
| 6.5% | 140 | 7.8 | Diabetes |
| 6.6% | 143 | 7.9 | Diabetes |
All values from 4.0% to 14.0% are in the A1c chart. Planning a retest? See how fast A1c can change. Over 65? See A1c by age.
Try another number
Estimated average glucose (eAG) = 28.7 × A1c − 46.7, from the ADAG study. mmol/L = mg/dL ÷ 18.016. Real averages vary from person to person at the same A1c. This is a conversion, not a diagnosis.
Other key numbers
6.5 mmol/L
6.6 mmol/L
6.8 mmol/L
7.0 mmol/L
7.3 mmol/L
7.4 mmol/L
7.6 mmol/L
7.8 mmol/L
8.6 mmol/L
9.4 mmol/L
10.2 mmol/L
10.9 mmol/L
11.7 mmol/L
13.3 mmol/L
14.9 mmol/L
16.5 mmol/L
Sources
- Nathan DM, Kuenen J, Borg R, Zheng H, Schoenfeld D, Heine RJ; A1c-Derived Average Glucose (ADAG) Study Group. Translating the A1C assay into estimated average glucose values. Diabetes Care. 2008;31(8):1473-1478. doi.org/10.2337/dc08-0545
- American Diabetes Association Professional Practice Committee. 2. Diagnosis and Classification of Diabetes: Standards of Care in Diabetes 2026. Diabetes Care. 2026;49(Suppl 1). doi.org/10.2337/dc26-S002
- National Institute of Diabetes and Digestive and Kidney Diseases (NIH). The A1C Test & Diabetes. www.niddk.nih.gov/health-information/diagnostic-tests/a1c-test
- Diabetes Prevention Program Research Group (Knowler WC, et al.). Reduction in the incidence of type 2 diabetes with lifestyle intervention or metformin. N Engl J Med. 2002;346(6):393-403. doi.org/10.1056/NEJMoa012512
Written and maintained by the controla1clevels.com editorial team. We do not have a medical reviewer; every claim links to its primary source above. Last reviewed: 2026-10-26. Spotted an error? See About.