A1C conversion chart

Q: How do I convert A1C to average glucose?

eAG (mg/dL) = 28.7 × A1C − 46.7 (ADAG formula). Divide mg/dL by 18 to get mmol/L.

Q: How do I convert A1C (%) to mmol/mol?

IFCC mmol/mol = (A1C% − 2.15) × 10.929. For example, 7.0% ≈ 53 mmol/mol — the unit used in the UK and much of Europe.

Q: What is a normal A1C?

Below 5.7% (about 39 mmol/mol) is normal; 5.7–6.4% is prediabetes; 6.5% and above is the diabetes diagnostic threshold.

Updated 2026-07-304.0–14.0% in 0.1 stepsADAG + IFCC formulas

Every A1C value from 4.0% to 14.0% converted to estimated average glucose (eAG) in mg/dL and mmol/L, plus the IFCC mmol/mol units used in the UK and much of Europe. Print it, or use the calculator for any value in between.

Formulas: eAG (mg/dL) = 28.7 × A1C − 46.7 · mmol/L = mg/dL ÷ 18 · mmol/mol = (A1C − 2.15) × 10.929. Zones: normal < 5.7% · prediabetes 5.7–6.4% · diabetes ≥ 6.5%.

A1C (%)	eAG (mg/dL)	eAG (mmol/L)	IFCC (mmol/mol)
4.0	68	3.8	20
4.1	71	3.9	21
4.2	74	4.1	22
4.3	77	4.3	23
4.4	80	4.4	25
4.5	82	4.6	26
4.6	85	4.7	27
4.7	88	4.9	28
4.8	91	5.1	29
4.9	94	5.2	30
5.0	97	5.4	31
5.1	100	5.5	32
5.2	103	5.7	33
5.3	105	5.9	34
5.4	108	6.0	36
5.5	111	6.2	37
5.6	114	6.3	38
5.7	117	6.5	39
5.8	120	6.6	40
5.9	123	6.8	41
6.0	125	7.0	42
6.1	128	7.1	43
6.2	131	7.3	44
6.3	134	7.4	45
6.4	137	7.6	46
6.5	140	7.8	48
6.6	143	7.9	49
6.7	146	8.1	50
6.8	148	8.2	51
6.9	151	8.4	52
7.0	154	8.6	53
7.1	157	8.7	54
7.2	160	8.9	55
7.3	163	9.0	56
7.4	166	9.2	57
7.5	169	9.4	58
7.6	171	9.5	60
7.7	174	9.7	61
7.8	177	9.8	62
7.9	180	10.0	63
8.0	183	10.2	64
8.1	186	10.3	65
8.2	189	10.5	66
8.3	192	10.6	67
8.4	194	10.8	68
8.5	197	10.9	69
8.6	200	11.1	70
8.7	203	11.3	72
8.8	206	11.4	73
8.9	209	11.6	74
9.0	212	11.7	75
9.1	214	11.9	76
9.2	217	12.1	77
9.3	220	12.2	78
9.4	223	12.4	79
9.5	226	12.5	80
9.6	229	12.7	81
9.7	232	12.9	83
9.8	235	13.0	84
9.9	237	13.2	85
10.0	240	13.3	86
10.1	243	13.5	87
10.2	246	13.7	88
10.3	249	13.8	89
10.4	252	14.0	90
10.5	255	14.1	91
10.6	258	14.3	92
10.7	260	14.5	93
10.8	263	14.6	95
10.9	266	14.8	96
11.0	269	14.9	97
11.1	272	15.1	98
11.2	275	15.2	99
11.3	278	15.4	100
11.4	280	15.6	101
11.5	283	15.7	102
11.6	286	15.9	103
11.7	289	16.0	104
11.8	292	16.2	105
11.9	295	16.4	107
12.0	298	16.5	108
12.1	301	16.7	109
12.2	303	16.8	110
12.3	306	17.0	111
12.4	309	17.2	112
12.5	312	17.3	113
12.6	315	17.5	114
12.7	318	17.6	115
12.8	321	17.8	116
12.9	324	18.0	117
13.0	326	18.1	119
13.1	329	18.3	120
13.2	332	18.4	121
13.3	335	18.6	122
13.4	338	18.8	123
13.5	341	18.9	124
13.6	344	19.1	125
13.7	346	19.2	126
13.8	349	19.4	127
13.9	352	19.5	128
14.0	355	19.7	130

Highlighted rows link to a full explainer for that value.

Frequently asked

How do I convert A1C to average glucose?

eAG (mg/dL) = 28.7 × A1C − 46.7 (ADAG formula). Divide mg/dL by 18 to get mmol/L.

How do I convert A1C (%) to mmol/mol?

IFCC mmol/mol = (A1C% − 2.15) × 10.929. For example, 7.0% ≈ 53 mmol/mol — the unit used in the UK and much of Europe.

What is a normal A1C?

Below 5.7% (about 39 mmol/mol) is normal; 5.7–6.4% is prediabetes; 6.5% and above is the diabetes diagnostic threshold.

Keep reading

Watch the average behind your A1C

SteadyRange logs your glucose and weight, shows time in range and estimated A1C as they move, and exports a clean PDF for your next appointment. Private by default.

Try SteadyRange →

Medical disclaimer. This page is general education, not medical advice, and uses population-average formulas (ADAG) to estimate average glucose. Individual factors — anemia, pregnancy, kidney disease, hemoglobin variants — can shift real values. Do not start, stop, or change any medication based on this page. Always consult a qualified healthcare provider about your results, targets, and treatment.