UnitConv

A1C to eAG (Average Glucose) Converter

Convert HbA1c (%) to estimated average glucose (eAG) in mg/dL and mmol/L — and back — with the standard ADA formula and reference chart.

This is an educational A1C ↔ average-glucose conversion for reference only — not medical advice, a diagnosis, or an A1C target. eAG is an estimate over about 2–3 months and will not match a single glucose reading. Always consult a physician or healthcare professional to interpret your A1C.

Conversion direction

Enter a value to see the conversion instantly.

Result
154.2 mg/dL
Estimated average glucose
154.2
mg/dL
Estimated average glucose
8.6
mmol/L

Formula

eAG (mg/dL) = 28.7 × A1C − 46.7 • eAG (mmol/L) = eAG(mg/dL) ÷ 18.0182

Based on the ADA/ADAG formula. eAG is an estimate of average glucose over about 2–3 months and depends only on the A1C value — not on age, sex or body. Valid A1C values are roughly 3–20%.

A1C to average-glucose reference chart

A1C (%)eAG (mg/dL)eAG (mmol/L)
5%975.4
6%1267
7%1548.6
8%18310.2
9%21211.7
10%24013.3
11%26914.9
12%29816.5
13%32618.1
14%35519.7

Related tools

Lab Value Unit ConverterConvert glucose and other lab values between mg/dL and mmol/L.

About this tool

This converter turns an HbA1c result (%) into an estimated average glucose (eAG) and vice versa. eAG expresses your A1C on the same scale as an everyday glucose meter — mg/dL or mmol/L — which many people find easier to picture. It uses the relationship published by the American Diabetes Association from the A1c-Derived Average Glucose (ADAG) study: eAG (mg/dL) = 28.7 × A1C − 46.7. The mmol/L value is obtained by dividing the mg/dL result by 18.0182, the same glucose factor used for lab-value conversions. The result is a purely mathematical conversion that depends only on the A1C value you enter — not on your age, sex or body. It does not measure your blood, diagnose anything, or set a target. Use it to read and compare numbers; leave interpretation to your healthcare team.

How to use it

1. Pick a direction: "A1C → eAG" or "eAG → A1C". 2. For A1C → eAG, type your A1C in percent (for example 7). The estimated average glucose appears instantly in both mg/dL and mmol/L. 3. For eAG → A1C, type an average glucose value and choose its unit (mg/dL or mmol/L); the matching A1C in percent is shown. 4. Use the reference chart to see the full A1C-to-average-glucose scale from 5% to 14%.

Conversion formula

The conversion uses the ADA/ADAG linear relationship: • eAG (mg/dL) = 28.7 × A1C(%) − 46.7 • eAG (mmol/L) = eAG(mg/dL) ÷ 18.0182 • A1C (%) = (eAG(mg/dL) + 46.7) ÷ 28.7 For example, an A1C of 7% gives 28.7 × 7 − 46.7 = 154.2 mg/dL, which is 154.2 ÷ 18.0182 = 8.6 mmol/L.

How to read the result

eAG is an estimate of your average glucose over roughly the previous 2–3 months — not a reading for any single moment. It will differ from the numbers on your meter or CGM at breakfast or bedtime, and two people with the same A1C can have different day-to-day patterns. The conversion tells you nothing about whether a value is good or bad for you; A1C goals are individual and are set with your clinician. If a result concerns you, talk to your doctor rather than acting on the number alone.

FAQ

What is eAG (estimated average glucose)? ▾

eAG is your HbA1c expressed as an average blood-glucose level in the units a glucose meter uses (mg/dL or mmol/L). It was introduced by the American Diabetes Association so that A1C can be compared with everyday glucose readings. It is an estimate of the average over the past 2–3 months, not a live measurement.

How do you convert A1C to average glucose? ▾

Use the ADA/ADAG formula eAG (mg/dL) = 28.7 × A1C − 46.7, where A1C is in percent. To get mmol/L, divide the mg/dL result by 18.0182. For example, an A1C of 7% converts to 28.7 × 7 − 46.7 = 154.2 mg/dL (about 8.6 mmol/L).

What is a good A1C level? ▾

Commonly cited references describe an A1C below 5.7% as typical for people without diabetes and often mention around 7% as a general target discussed for many adults with diabetes — but this is general information, not advice. Actual A1C targets are individual and depend on age, health, pregnancy, hypoglycemia risk and other factors, so the right goal for you should be set with your doctor.

Is eAG the same as a fingerstick glucose reading? ▾

No. A fingerstick or CGM value is your glucose at a single moment, while eAG is an estimate of your average over the previous 2–3 months derived from A1C. They are measured differently, so eAG will usually not match any individual meter reading, and it should not be used as a substitute for checking your glucose.

Does this tool diagnose diabetes or set a target? ▾

No. It only converts between A1C and estimated average glucose as a unit/formula calculation. It does not diagnose any condition, judge whether a value is normal, or set a goal. Diagnosis and A1C targets must come from a healthcare professional who knows your full situation.

This is an educational A1C ↔ average-glucose conversion for reference only — not medical advice, a diagnosis, or an A1C target. eAG is an estimate over about 2–3 months and will differ from single glucose readings. Always consult a physician or healthcare professional to interpret your A1C.