A1c to average glucose converter
Convert an A1c percent into the estimated average glucose it corresponds to, in mg/dL or mmol/L, or an average glucose back into an A1c, with the IFCC mmol/mol value alongside. It uses the published ADAG regression and runs entirely in your browser.
Medically reviewed by Kevin Brandstetter, M.D.Updated September 23, 2026
The percent on a lab report, such as 6.8.
Estimated average glucose
Enter an A1c
The average glucose it corresponds to appears here, with the IFCC value.
A converter, not a diagnosis.
The estimated average glucose is what the study's equation predicts for a group of people with that A1c. Any one person's average can sit well above or below it. Anemia, recent blood loss or transfusion, hemoglobin variants, kidney or liver disease, and pregnancy can each move an A1c away from average glucose. Only a laboratory A1c, read by a licensed clinician with your history, says anything about your health.
Methodology
- How this is calculated
- From an A1c, the estimated average glucose comes from the ADAG study's linear regressions, each in the unit it was published in: “eAG (mg/dl)=28.7 × A1C − 46.7” and “eAG (mmol/l)=1.5944 × A1C − 2.594”. Neither unit is converted from the other. From an average glucose, the mg/dL equation is solved for A1c; a mmol/L entry is first converted to mg/dL at 18.0182 mg/dL per mmol/L, so the answer does not change when you switch units. The IFCC value uses the NGSP master equation, “IFCC = (10.93*NGSP) - 23.50”. Every figure is rounded once, with a half rounded up, from the unrounded result.
- Where the data comes from
- Nathan DM, Kuenen J, Borg R, Zheng H, Schoenfeld D, Heine RJ, for the A1c-Derived Average Glucose (ADAG) Study Group, Translating the A1C Assay Into Estimated Average Glucose Values, Diabetes Care 2008;31(8):1473-1478, Table 2. National Glycohemoglobin Standardization Program, IFCC Standardization of HbA1c, ngsp.org. The published categories below are from the American Diabetes Association Professional Practice Committee, 2. Diagnosis and Classification of Diabetes: Standards of Care in Diabetes-2026, Diabetes Care 2026;49(Suppl. 1):S27-S49.
- Last updated
- September 23, 2026
- What this does not account for
- How far one person sits from the study average. ADAG enrolled adults aged 18 to 70 with stable glucose and excluded anemia, hemoglobin variants, and kidney or liver disease, so it says less about children, pregnancy, or those conditions. In the study, 98.5 percent of A1c samples were between 4 and 10 percent; outside that range the equation is extended past most of its data, and the result panel says so.
What the two numbers measure
An A1c is the share of hemoglobin in your red blood cells that has glucose attached, and it reflects glucose over roughly the previous three months. Average glucose is the mean of many glucose readings from a meter or a continuous glucose monitor. The ADAG study measured both in 507 adults to find the line that links them, so an A1c can be read in the same units as a glucose meter.
Published A1c categories
The American Diabetes Association publishes these categories for an A1c measured by a laboratory. They are here for reference and are not applied to any number you enter: this page converts numbers and does not diagnose anything. Discuss your result with a clinician.
| A1c | Category as published |
|---|---|
| Below 5.7% (below 39 mmol/mol) | Normal |
| 5.7% to 6.4% (39 to 47 mmol/mol) | Increased risk for diabetes (prediabetes) |
| 6.5% or above (48 mmol/mol or above) | Meets the diagnostic criterion for diabetes |
Why your own numbers can differ
The equation describes the middle of the study's data. At an A1c of 7 percent it gives 154 mg/dL, and the study's own table puts the 95 percent interval at 123 to 185 mg/dL. So a meter or monitor average that does not match the converted number is common and is not, by itself, an error in either one.
Nothing here is stored
Your answers stay in your browser. They are not sent to Temi, not saved, not attached to you, and not recorded in any session replay, and closing the tab clears them. Temi knows only that someone opened this tool, the same thing it knows about every page.
More free tools
- GLP-1 cost calculatorSee the whole monthly cost, itemized.
- Dose to units calculatorTurn a milligram dose into a syringe reading.
- GLP-1 eligibility checkerSee where you stand before you start.
- Refill and renewal checkerFind out whether you need a refill or a renewal.
- Titration schedule plannerPut the standard dose steps on real dates.
- PHQ-9 depression screeningScore the standard nine-question depression screen.
- GAD-7 anxiety screeningScore the standard seven-question anxiety screen.
- PHQ-2 depression pre-screenTwo questions before the full depression screen.
- BMI calculatorSee your BMI and the WHO category it falls in.
- Daily calorie needs calculatorEstimate the calories it takes to maintain your weight.
- Ideal body weight calculatorSee the weight the Devine equation returns for your height.
- Pregnancy due date calculatorTurn a known date into an estimated due date.
- Creatinine clearance calculatorEstimate creatinine clearance from the Cockcroft and Gault equation.
- eGFR calculatorEstimate GFR from the race-free CKD-EPI 2021 equation.
- Mean arterial pressure calculatorSee the mean arterial pressure from a blood pressure reading.
- LDL cholesterol calculatorEstimate LDL cholesterol from a standard lipid panel.
- ASCVD 10-year risk calculatorEstimate 10-year cardiovascular risk with the AHA PREVENT equations.
- Insomnia Severity IndexScore the standard seven-item insomnia questionnaire.
- Geriatric Depression Scale (GDS-15)Score the fifteen-question yes or no mood scale for older adults.
- PC-PTSD-5 screenScore the five-question PTSD screen from the VA.
- mMRC dyspnea scaleFind the grade that matches your breathlessness.
- Waist-to-hip ratio calculatorSee your waist-to-hip ratio beside the WHO cut-off.
- Body Roundness Index calculatorSee the Body Roundness Index for your height and waist.
- Pack-years calculatorTurn a smoking history into pack-years.
- IPSS prostate symptom scoreScore the standard seven-question urinary symptom index.
Already taking a medication?
Temi's physicians review renewals for non-controlled medications, usually within 48 hours. A number on this page is not a prescription and does not decide anything.
A licensed physician reviews every request. Nothing on this page is a prescription.