What is my average blood sugar if my HbA1c is 7%?

An HbA1c of 7% converts to an estimated average glucose (eAG) of about 154 mg/dL, or 8.6 mmol/L. That is the ADA/ADAG formula: eAG = 28.7 × 7 − 46.7 = 154.2 mg/dL. 7% is the usual general adult target, and it sits in the diabetes range.

How do you convert HbA1c to average glucose?

Use the ADAG regression from the 2008 Diabetes Care study: eAG (mg/dL) = 28.7 × A1C − 46.7. To get mmol/L, divide the mg/dL result by 18.0182 (glucose's molar factor). For example, HbA1c 8% gives 28.7 × 8 − 46.7 = 183 mg/dL ≈ 10.2 mmol/L.

Is HbA1c 6.5% diabetes?

By the ADA's diagnostic threshold, an HbA1c of 6.5% or higher on a confirmed lab test meets the criterion for diabetes. 6.5% corresponds to an estimated average glucose near 140 mg/dL (7.8 mmol/L). A single result is not a diagnosis — it should be confirmed with a repeat or a second test by your doctor.

What is the difference between HbA1c % and mmol/mol?

% is the older DCCT/NGSP unit; mmol/mol is the IFCC unit used on many newer reports. They measure the same thing on different scales, linked by IFCC = (DCCT% − 2.15) × 10.929. So 7.0% equals 53 mmol/mol and 6.5% equals 48 mmol/mol. This tool shows both.

What blood sugar level is HbA1c 8?

HbA1c 8% converts to an estimated average glucose of about 183 mg/dL, or 10.2 mmol/L (28.7 × 8 − 46.7 = 182.9). It is in the diabetes range and above the usual 7% adult target, which generally prompts a treatment review with your doctor.

Is eAG the same as my fasting or random glucometer reading?

No. eAG is your estimated 24-hour average over the roughly three months your HbA1c reflects. A fasting or random meter reading is a single point in time and will usually be lower (fasting) or higher (after meals) than the eAG. Do not treat eAG as a target for a single reading.

Why might the estimate be wrong for me?

The HbA1c–eAG relationship assumes a normal red-cell lifespan. It is unreliable with anaemia, recent blood transfusion, pregnancy, chronic kidney or liver disease, and haemoglobin variants such as HbE (common in South Asia). In those cases the number can over- or under-estimate your true average — ask your doctor about alternatives like fructosamine.

Is this reliable for people in Sri Lanka?

The ADAG regression is derived from an international cohort and is used worldwide, including by Sri Lankan labs that report in %. It is a sound general estimate. The main local caveat is haemoglobin variants and thalassaemia trait, which are more common in South Asia and can distort HbA1c — confirm with your clinician if you carry one.

Health · Diabetes

HbA1c to Average Blood Glucose (eAG) Calculator

Turn an HbA1c result into the estimated average blood glucose it represents — in both mg/dL and mmol/L — and convert back the other way. It also switches between DCCT % and IFCC mmol/mol and flags the ADA normal, prediabetes or diabetes band. Free, no signup, sources cited.

By Induwara Ashinsana— Executive Director, Ryzera TechnologiesUpdated Jul 16, 2026

HbA1c ⇄ Average glucoseeAG converter

ADA / ADAG formula

Your HbA1c value

Enter the HbA1c printed on your lab report. Most Sri Lankan labs report in % (DCCT); switch to mmol/mol if yours uses IFCC units.

Common values (%)

Avg glucose (mg/dL)

154

Avg glucose (mmol/L)

8.6

HbA1c (IFCC)

53 mmol/mol

ADA classificationDiabetes range

Exactly at the usual ADA adult target of 7%. The ADA general adult target is an HbA1c below 7.0%. This is an estimate, not a diagnosis — confirm with your doctor and a lab test.

Reference table

Your value is highlighted in the reference table below.

HbA1c %	mg/dL	mmol/L	IFCC
5.0	97	5.4	31
5.5	111	6.2	37
6.0	125	7.0	42
6.5	140	7.8	48
7.0you	154	8.6	53
7.5	169	9.4	58
8.0	183	10.2	64
8.5	197	10.9	69
9.0	212	11.7	75
9.5	226	12.5	80
10.0	240	13.3	86
10.5	255	14.1	91
11.0	269	14.9	97
11.5	283	15.7	102
12.0	298	16.5	108
12.5	312	17.3	113
13.0	326	18.1	119
13.5	341	18.9	124
14.0	355	19.7	130

Estimate only — not a diagnosis.

eAG is a population average from the ADAG study; your true average can differ. The relationship is unreliable with anaemia, recent blood transfusion, pregnancy, chronic kidney or liver disease, haemoglobin variants (e.g. HbE, common in South Asia) or any condition that shortens red-cell lifespan. Always confirm with a laboratory HbA1c and your doctor.

Sources cited: Nathan et al. 2008 (ADAG), ADA Standards of Care, NGSP–IFCC master equation — see the references below.

How it works

HbA1c measures the share of your haemoglobin that has glucose stuck to it, which reflects your average blood sugar over the roughly three months a red blood cell lives. In 2008 the international ADAG (A1C-Derived Average Glucose) study measured continuous and fingerstick glucose in 507 people and fitted a straight line between HbA1c and their true average glucose. That line is the formula this calculator uses.

Normalise the unit. If you enter HbA1c in IFCC mmol/mol, it is first converted to the DCCT % scale with the NGSP–IFCC master equation: A1C% = mmol/mol ÷ 10.929 + 2.15.
Apply the ADAG regression. eAG (mg/dL) = 28.7 × A1C − 46.7. This had an R² of 0.84 in the original study.
Convert to mmol/L.Divide the mg/dL figure by 18.0182, glucose's exact molar factor. The paper also published a parallel line, eAG (mmol/L) = 1.59 × A1C − 2.59, and the two agree to within about 0.1 mmol/L — a built-in cross-check.
Classify. The ADA Standards of Care set HbA1c below 5.7% as normal, 5.7–6.4% as prediabetes and 6.5% or above as diabetes, with a general adult target below 7.0%.

The reverse direction simply inverts the regression: A1C% = (eAG mg/dL + 46.7) ÷ 28.7. Every figure is rounded the way labs report it — mg/dL to whole numbers, mmol/L to one decimal, HbA1c to one decimal and IFCC to whole mmol/mol. The conversions are pure and identical for everyone; eAG is a population average, so your personal average can differ, especially with the red-cell conditions listed in the disclaimer.

Worked examples

HbA1c 7.0% → average glucose

eAG (mg/dL) = 28.7 × 7.0 − 46.7 = 200.9 − 46.7 = 154.2 → 154 mg/dL
mmol/L = 154.2 ÷ 18.0182 = 8.56 → 8.6 mmol/L
IFCC = (7.0 − 2.15) × 10.929 = 53.0 → 53 mmol/mol
Band: diabetes range, exactly at the 7% adult target. Matches the ADA table (154 mg/dL).

HbA1c 6.0% → average glucose

eAG (mg/dL) = 28.7 × 6.0 − 46.7 = 172.2 − 46.7 = 125.5 → 126 mg/dL
mmol/L = 125.5 ÷ 18.0182 = 6.97 → 7.0 mmol/L
IFCC = (6.0 − 2.15) × 10.929 = 42.1 → 42 mmol/mol
Band: prediabetes range. Matches the ADA table (126 mg/dL).

Reverse: average glucose 200 mg/dL → HbA1c

A1C% = (200 + 46.7) ÷ 28.7 = 246.7 ÷ 28.7 = 8.596 → 8.6%
IFCC = (8.596 − 2.15) × 10.929 = 70.4 → 70 mmol/mol
mmol/L = 200 ÷ 18.0182 = 11.1 mmol/L
Band: diabetes range, above the 7% target.

Frequently asked questions

Sources & references

The formulas and thresholds on this page were last cross-checked against these sources on 2026-07-16. The mg/dL values were reconciled to the ADA reference table at 5%, 6%, 7% and 8% (97, 126, 154 and 183 mg/dL).

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