A1C 5.7%
eAG mg/dL = 28.7 x 5.7 - 46.7 = 117 mg/dL.
IFCC = 10.929 x (5.7 - 2.15) = 39 mmol/mol.
This is the common lower threshold for the prediabetes range.
HbA1c Converter: A1C to eAG, IFCC, NGSP and Blood Sugar
Last reviewed: June 7, 2026. Formulas are based on the ADAG eAG equation and NGSP/IFCC master conversion equation; this tool is educational and does not diagnose diabetes.
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Unit check: HbA1c IFCC uses mmol/mol. Glucose uses mmol/L. These similar-looking units are not interchangeable.
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Percent as typically reported in UK/US labs.
IFCC units as reported in mmol/mol.
Estimated average glucose (eAG) in mg/dL.
Estimated average glucose (eAG) in mmol/L.
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Converted values
HbA1c (NGSP)—
HbA1c (IFCC)—
eAG (mg/dL)—
eAG (mmol/L)—
Result interpretation
Enter a value to see whether the approximate A1C range is below 5.7%, 5.7-6.4%, or 6.5% or higher.
Diagnosis requires clinical confirmation by a qualified healthcare professional.
Rounding: A1c to 1 dp (NGSP) / 0 dp (IFCC), glucose to nearest 1 mg/dL / 0.1 mmol/L.
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Common A1C Conversion Table
Values are rounded from the ADAG and NGSP/IFCC equations. The range label is a general interpretation aid, not a diagnosis.
| NGSP A1C | IFCC mmol/mol | eAG mg/dL | eAG mmol/L | Approximate range |
|---|---|---|---|---|
| 5.0% | 31 | 97 | 5.4 | Below prediabetes threshold |
| 5.5% | 37 | 111 | 6.2 | Below prediabetes threshold |
| 5.7% | 39 | 117 | 6.5 | Prediabetes range |
| 6.0% | 42 | 125 | 7.0 | Prediabetes range |
| 6.5% | 48 | 140 | 7.7 | Diabetes threshold or higher |
| 7.0% | 53 | 154 | 8.5 | Diabetes threshold or higher |
| 7.5% | 58 | 169 | 9.3 | Diabetes threshold or higher |
| 8.0% | 64 | 183 | 10.1 | Diabetes threshold or higher |
| 8.5% | 69 | 197 | 10.9 | Diabetes threshold or higher |
| 9.0% | 75 | 212 | 11.7 | Diabetes threshold or higher |
| 9.5% | 80 | 226 | 12.5 | Diabetes threshold or higher |
| 10.0% | 86 | 240 | 13.3 | Diabetes threshold or higher |
| 10.5% | 91 | 255 | 14.1 | Diabetes threshold or higher |
| 11.0% | 97 | 269 | 14.9 | Diabetes threshold or higher |
| 11.5% | 102 | 283 | 15.7 | Diabetes threshold or higher |
| 12.0% | 108 | 298 | 16.5 | Diabetes threshold or higher |
| 12.5% | 113 | 312 | 17.3 | Diabetes threshold or higher |
| 13.0% | 119 | 326 | 18.1 | Diabetes threshold or higher |
| 13.5% | 124 | 341 | 18.9 | Diabetes threshold or higher |
| 14.0% | 130 | 355 | 19.7 | Diabetes threshold or higher |
Worked Examples
A1C 6.5%
eAG mg/dL = 28.7 x 6.5 - 46.7 = 140 mg/dL.
IFCC = 10.929 x (6.5 - 2.15) = 48 mmol/mol.
This is a common diabetes threshold, but diagnosis needs clinical confirmation.
A1C 7.0%
eAG mg/dL = 28.7 x 7.0 - 46.7 = 154 mg/dL.
eAG mmol/L = 1.59 x 7.0 - 2.59 = 8.5 mmol/L.
Many diabetes care plans use individualized A1C targets, often around this area.
A1C 8.0%
eAG mg/dL = 28.7 x 8.0 - 46.7 = 183 mg/dL.
IFCC = 10.929 x (8.0 - 2.15) = 64 mmol/mol.
Higher values should be interpreted with a clinician and the full clinical picture.
154 mg/dL to A1C
A1C = (154 + 46.7) / 28.7 = 7.0%.
IFCC = 10.929 x (7.0 - 2.15) = 53 mmol/mol.
This is why 154 mg/dL is commonly shown as the eAG for A1C 7.0%.
About the equations
The relationship between HbA1c and blood glucose has been studied extensively to help people and clinicians interpret lab values in a practical way. HbA1c, sometimes called “glycated hemoglobin,” reflects how much sugar has attached to red blood cells over their lifespan. Because red blood cells live around three months, HbA1c provides an average picture of glucose control over the past 8–12 weeks, with recent weeks weighing more heavily.
To translate HbA1c into a more familiar blood sugar number, researchers developed the ADAG (A1c-Derived Average Glucose) equations. These formulas estimate the average glucose level that corresponds to a given HbA1c:
- A1c → eAG: eAG (mg/dL) = 28.7 × A1c(%) − 46.7
- A1c → eAG: eAG (mmol/L) = 1.59 × A1c(%) − 2.59
- Inverse (eAG → A1c): A1c(%) = (eAGmg/dL + 46.7) ÷ 28.7
- Inverse (eAG → A1c): A1c(%) = (eAGmmol/L + 2.59) ÷ 1.59
- Units: 1 mmol/L = 18 mg/dL
Sources:
- Nathan DM et al. (2008), Diabetes Care: ADAG study deriving eAG equations (DOI: 10.2337/dc08-0545)
- NGSP/IFCC standardization overview and master conversion equation
- NIDDK A1C guidance, including factors that can affect interpretation
In addition to average glucose, HbA1c can be expressed in two different laboratory standards. The NGSP system (most common in the US and UK) reports HbA1c as a percentage, while the IFCC standard (widely used internationally) reports it in mmol/mol. The two can be converted using:
- NGSP(%) = 0.0915 × IFCC (mmol/mol) + 2.15
- IFCC (mmol/mol) = 10.929 × (NGSP − 2.15)
These conversions are helpful because many online resources, research papers, and clinics may report results in different units. With a converter, you can quickly move between NGSP %, IFCC mmol/mol, and estimated average glucose in either mg/dL or mmol/L. This makes it easier to compare your results with educational materials, scientific studies, or glucose targets set by health guidelines.
Important disclaimer: The eAG values are statistical estimates. Individual results may vary due to conditions such as anemia, hemoglobin variants, kidney or liver disease, pregnancy, or certain medications. Continuous glucose monitors (CGM) or home blood glucose meters may show numbers that differ from the calculated eAG. Always interpret HbA1c and glucose values in consultation with your healthcare professional.
Why A1C and Meter Averages May Differ
Different time windows
HbA1c reflects glucose exposure over roughly 8-12 weeks, with recent weeks contributing more. Meter or CGM averages may cover a shorter or different period.
Testing pattern matters
A fingerstick average depends on when readings are taken. Testing mostly before meals, after meals, or during symptoms can make the average differ from eAG.
Red blood cell factors
Anemia, recent blood loss, transfusion, pregnancy, kidney or liver disease, and hemoglobin variants can make HbA1c less reliable for some people.
Lab method and device variation
Labs, CGMs, and home meters each have measurement limits. A clinician can compare A1C, glucose logs, symptoms, and other tests when results do not line up.
HbA1c Converter FAQ
What is A1C 7.0 in mg/dL?
An A1C of 7.0% is about 154 mg/dL estimated average glucose, or about 8.5 mmol/L, using the ADAG equation.
What is A1C 6.5 in mmol/mol?
An A1C of 6.5% is about 48 mmol/mol on the IFCC scale. It corresponds to an estimated average glucose of about 140 mg/dL.
Is 5.7% prediabetes?
An A1C of 5.7% is commonly used as the lower threshold for the prediabetes range. Diagnosis requires clinical confirmation and may use repeat testing or other glucose tests.
How accurate is A1C to eAG conversion?
The conversion is an estimate based on population data from the ADAG study. It is useful for orientation, but individual meter, CGM, and lab results can differ.
Why is my meter average different from eAG?
Meter averages depend on when you test, while A1C reflects glucose attached to red blood cells over time. Anemia, hemoglobin variants, kidney disease, liver disease, pregnancy, recent blood loss, and some medicines can also affect A1C.
Can this calculator diagnose diabetes?
No. This calculator converts and explains values for education only. Diabetes diagnosis requires clinical confirmation by a qualified healthcare professional.
What is the difference between NGSP and IFCC?
NGSP reports HbA1c as a percentage, such as 7.0%. IFCC reports HbA1c in mmol/mol, such as 53 mmol/mol. HbA1c mmol/mol is different from glucose mmol/L.