HbA1c Chart

This page is reference information, not medical advice.

Nothing here can diagnose you, and nothing here is a treatment plan. Blood glucose results are interpreted by a doctor alongside your history, your symptoms and a repeat test — a single number on a screen is not a diagnosis. If any reading concerns you, or if you feel unwell, see a doctor rather than a website.

HbA1c converted to estimated average glucose with the ADAG regression, eAG (mg/dL) = 28.7 × A1C − 46.7. The mmol/mol column is the IFCC unit, from the NGSP master equation. The final column reads the A1C against the ADA diagnostic bands.
HbA1c (%)	mmol/mol	eAG (mg/dL)	eAG (mmol/L)	Where it sits
4.0%	20	68	3.8	Below the prediabetes range
4.1%	21	71	3.9	Below the prediabetes range
4.2%	22	74	4.1	Below the prediabetes range
4.3%	23	77	4.3	Below the prediabetes range
4.4%	25	80	4.4	Below the prediabetes range
4.5%	26	82	4.6	Below the prediabetes range
4.6%	27	85	4.7	Below the prediabetes range
4.7%	28	88	4.9	Below the prediabetes range
4.8%	29	91	5.1	Below the prediabetes range
4.9%	30	94	5.2	Below the prediabetes range
5.0%	31	97	5.4	Below the prediabetes range
5.1%	32	100	5.5	Below the prediabetes range
5.2%	33	103	5.7	Below the prediabetes range
5.3%	34	105	5.9	Below the prediabetes range
5.4%	36	108	6.0	Below the prediabetes range
5.5%	37	111	6.2	Below the prediabetes range
5.6%	38	114	6.3	Below the prediabetes range
5.7%	39	117	6.5	In the prediabetes range
5.8%	40	120	6.6	In the prediabetes range
5.9%	41	123	6.8	In the prediabetes range
6.0%	42	126	7.0	In the prediabetes range
6.1%	43	128	7.1	In the prediabetes range
6.2%	44	131	7.3	In the prediabetes range
6.3%	45	134	7.4	In the prediabetes range
6.4%	46	137	7.6	In the prediabetes range
6.5%	48	140	7.8	In the diabetes range
6.6%	49	143	7.9	In the diabetes range
6.7%	50	146	8.1	In the diabetes range
6.8%	51	148	8.2	In the diabetes range
6.9%	52	151	8.4	In the diabetes range
7.0%	53	154	8.6	In the diabetes range
7.1%	54	157	8.7	In the diabetes range
7.2%	55	160	8.9	In the diabetes range
7.3%	56	163	9.0	In the diabetes range
7.4%	57	166	9.2	In the diabetes range
7.5%	58	169	9.4	In the diabetes range
7.6%	60	171	9.5	In the diabetes range
7.7%	61	174	9.7	In the diabetes range
7.8%	62	177	9.8	In the diabetes range
7.9%	63	180	10.0	In the diabetes range
8.0%	64	183	10.2	In the diabetes range
8.1%	65	186	10.3	In the diabetes range
8.2%	66	189	10.5	In the diabetes range
8.3%	67	192	10.6	In the diabetes range
8.4%	68	194	10.8	In the diabetes range
8.5%	69	197	10.9	In the diabetes range
8.6%	70	200	11.1	In the diabetes range
8.7%	72	203	11.3	In the diabetes range
8.8%	73	206	11.4	In the diabetes range
8.9%	74	209	11.6	In the diabetes range
9.0%	75	212	11.7	In the diabetes range
9.1%	76	214	11.9	In the diabetes range
9.2%	77	217	12.1	In the diabetes range
9.3%	78	220	12.2	In the diabetes range
9.4%	79	223	12.4	In the diabetes range
9.5%	80	226	12.5	In the diabetes range
9.6%	81	229	12.7	In the diabetes range
9.7%	83	232	12.9	In the diabetes range
9.8%	84	235	13.0	In the diabetes range
9.9%	85	237	13.2	In the diabetes range
10.0%	86	240	13.3	In the diabetes range
10.1%	87	243	13.5	In the diabetes range
10.2%	88	246	13.7	In the diabetes range
10.3%	89	249	13.8	In the diabetes range
10.4%	90	252	14.0	In the diabetes range
10.5%	91	255	14.1	In the diabetes range
10.6%	92	258	14.3	In the diabetes range
10.7%	93	260	14.5	In the diabetes range
10.8%	95	263	14.6	In the diabetes range
10.9%	96	266	14.8	In the diabetes range
11.0%	97	269	14.9	In the diabetes range
11.1%	98	272	15.1	In the diabetes range
11.2%	99	275	15.2	In the diabetes range
11.3%	100	278	15.4	In the diabetes range
11.4%	101	280	15.6	In the diabetes range
11.5%	102	283	15.7	In the diabetes range
11.6%	103	286	15.9	In the diabetes range
11.7%	104	289	16.0	In the diabetes range
11.8%	105	292	16.2	In the diabetes range
11.9%	107	295	16.4	In the diabetes range
12.0%	108	298	16.5	In the diabetes range
12.1%	109	301	16.7	In the diabetes range
12.2%	110	303	16.8	In the diabetes range
12.3%	111	306	17.0	In the diabetes range
12.4%	112	309	17.2	In the diabetes range
12.5%	113	312	17.3	In the diabetes range
12.6%	114	315	17.5	In the diabetes range
12.7%	115	318	17.6	In the diabetes range
12.8%	116	321	17.8	In the diabetes range
12.9%	117	324	18.0	In the diabetes range
13.0%	119	326	18.1	In the diabetes range
13.1%	120	329	18.3	In the diabetes range
13.2%	121	332	18.4	In the diabetes range
13.3%	122	335	18.6	In the diabetes range
13.4%	123	338	18.8	In the diabetes range
13.5%	124	341	18.9	In the diabetes range
13.6%	125	344	19.1	In the diabetes range
13.7%	126	346	19.2	In the diabetes range
13.8%	127	349	19.4	In the diabetes range
13.9%	128	352	19.6	In the diabetes range
14.0%	130	355	19.7	In the diabetes range

Estimated average glucose is an average across roughly the previous three months. It is not a prediction of your reading tomorrow morning, and two people with the same HbA1c can have very different day-to-day swings.

How each row was produced

eAG (mg/dL) = 28.7 × HbA1c − 46.7 · mmol/L = mg/dL ÷ 18.016 · mmol/mol = (HbA1c − 2.15) × 10.929

No row on this chart was copied from another chart. Each is computed from the published equations at build time, which is why the figures agree with the NGSP's own published table at every whole percentage point.

Source: 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. Link
Source: National Glycohemoglobin Standardization Program (NGSP) — HbA1c and estimated average glucose (eAG). Link
Source: American Diabetes Association, Standards of Care in Diabetes — Diagnosis and Classification of Diabetes. Diabetes Care 2025;48(Suppl. 1):S27–S49. Link

PeakForm is a training and accountability programme. It is not a treatment for diabetes or prediabetes, it is not a substitute for your doctor's advice, and nothing on this site should be acted on before speaking to one.

Common questions

What does HbA1c 6.5 mean?

An HbA1c of 6.5% is the threshold at which both the ADA and WHO place a result in the diabetes range. It converts to an estimated average glucose of about 140 mg/dL (7.8 mmol/L) and equals 48 mmol/mol. It is a threshold, not a diagnosis — confirmation is required, and only a doctor can make one.

What is HbA1c 5.9 in average sugar?

About 123 mg/dL, or 6.8 mmol/L, using the ADAG equation. On the ADA criteria 5.9% sits inside the prediabetes band of 5.7% to 6.4%.

How is the HbA1c chart calculated?

Every row uses the published ADAG regression, eAG in mg/dL = 28.7 × A1C − 46.7, converted to mmol/L by dividing by 18.016, with the IFCC value from the NGSP master equation. Nothing is interpolated from another chart.

General information only — NOT medical advice, and never a diagnosis. Only a doctor can interpret your results and diagnose or treat diabetes. If a reading concerns you, see a doctor rather than a website. Every threshold, equation and glycemic index value used on this site is listed with its publication on the data & method page.

How each row was produced

Common questions

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