Your A1c, as an average blood sugar you can read.
Enter an A1c result or an average glucose. The dial shows the estimated average glucose in mg/dL and mmol/L, and where the number sits in the American Diabetes Association ranges.
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.
Key A1c numbers
What a specific result means, the average glucose it maps to, and questions to bring to your doctor.
6.5 mmol/L
6.6 mmol/L
6.8 mmol/L
7.0 mmol/L
7.1 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
Looking for another value? Every A1c from 4.0% to 14.0% is in the A1c chart.
A1c ranges
Diagnostic categories from the ADA Standards of Care (ADA 2026). Treatment goals are set individually with your care team. En español.
| Category | A1c | Estimated average glucose |
|---|---|---|
| Normal | Below 5.7% | Below 117 mg/dL (6.5 mmol/L) |
| Prediabetes | 5.7% to 6.4% | 117 to 137 mg/dL (6.5 to 7.6 mmol/L) |
| Diabetes | 6.5% or higher | 140 mg/dL or higher (7.8 mmol/L) |
Tools
A1c converter
Two-way: A1c, mg/dL, mmol/L and IFCC mmol/mol, with the formula shown.
GMI from a CGM average
Turn the mean glucose from your sensor report into a Glucose Management Indicator.
Printable A1c chart
Every A1c from 4% to 14% with its average glucose. Print it or save it as a PDF.
HbA1c in mmol/mol
Convert mmol/mol to % and back, with UK and US ranges side by side.
GMI vs A1c
Why your CGM's GMI and your lab A1c differ, with a chart of both.
A1c by age
The normal range is the same at every adult age. Goals for adults 65 and older are not.
How the converter works
The ADAG study measured A1c against average glucose in several hundred people and produced a linear formula (Nathan 2008). The ADA uses the same formula in its own calculator (ADA eAG).
An estimate, not a reading: your meter will not match it day to day, because eAG is a long-term average (NIDDK). Our method.
Using a CGM?
Your sensor's mean glucose can be turned into a Glucose Management Indicator (GMI), an A1c-like estimate from CGM data (Bergenstal 2018).
Learn
What the A1c test measures
Glucose sticks to hemoglobin. The test reads how much did, over about 3 months.
A1c, fasting glucose and GMI
Three numbers that describe blood sugar in different ways, and why they can disagree.
The prediabetes A1c range
What 5.7% to 6.4% means, how it is confirmed, and what lowered risk in the DPP trial.
A1c high, glucose normal
Six reasons the two tests disagree, and how a repeat test settles it.
Do you need to fast for an A1c?
No. Why food does not change the result, and which tests drawn with it do need a fast.
How often to check A1c
Twice a year, every 3 months, yearly or every 3 years: the ADA schedule by situation.
A1c in children and teens
Normal is below 5.7% at any age. When A1c is not used in kids, and the ADA goals with diabetes.
Low A1c: what it means
No lower cut point for normal, what makes A1c read falsely low, and low A1c with diabetes treatment.
Time in range vs A1c
70% in range is about an A1c of 7%. The chart, the ADA CGM goals, and what each measure misses.
Estimated average glucose (eAG)
Your A1c in mg/dL. The eAG to A1c chart, the normal range, and why it differs from meter readings.
How fast A1c can change
Why a week shows little, a month shows part, and about 3 months shows most of a change.
A1c goals in diabetes
Why 7% is a common goal, and when a different goal is safer.
A1c in pregnancy
Why A1c runs lower, what 5.9% and 6.5% mean early on, and the ADA goals with diabetes.
A1c and anemia
Iron deficiency can push A1c up; other anemias can pull it down. What doctors use instead.
When A1c can mislead
Anemia, blood loss, kidney or liver disease, hemoglobin variants and pregnancy.
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. eAG/A1C conversion calculator (professional.diabetes.org). professional.diabetes.org/glucose_calc
- 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
- Bergenstal RM, Beck RW, Close KL, et al. Glucose Management Indicator (GMI): a new term for estimating A1C from continuous glucose monitoring. Diabetes Care. 2018;41(11):2275-2280. doi.org/10.2337/dc18-1581
- National Institute of Diabetes and Digestive and Kidney Diseases (NIH). The A1C Test & Diabetes. www.niddk.nih.gov/health-information/diagnostic-tests/a1c-test
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: 2026-10-25. Spotted an error? See About.