Blood Glucose Unit Converter

Instantly convert blood glucose readings between mg/dL and mmol/L. Includes ADA target ranges in both units and a full reference table.

🔄 mg/dL ↔ mmol/L Converter

mg/dL

mmol/L

Reference Table — Common BG Values

mg/dL	mmol/L	Context
54	3.0	Severe hypoglycemia threshold (ADA)
70	3.9	Hypoglycemia alert level — treat immediately
80	4.4	ADA fasting target (lower bound)
100	5.6	Typical pre-meal target
130	7.2	ADA pre-meal target (upper bound)
140	7.8	ADA 1-hr post-meal target (upper bound)
180	10.0	ADA 2-hr post-meal target (upper bound)
250	13.9	Moderate hyperglycemia — consider correction
300	16.7	Check ketones — DKA risk, seek guidance

Full Conversion Chart: mg/dL to mmol/L

Every common blood glucose value from 40 to 600 mg/dL converted to mmol/L. Values below 70 mg/dL (3.9 mmol/L) are hypoglycemic; values above 180 mg/dL (10.0 mmol/L) are above the typical post-meal target.

mg/dL	mmol/L	mg/dL	mmol/L
40	2.2	165	9.2
45	2.5	170	9.4
50	2.8	175	9.7
54	3.0	180	10.0
60	3.3	190	10.5
65	3.6	200	11.1
70	3.9	210	11.7
75	4.2	220	12.2
80	4.4	230	12.8
85	4.7	240	13.3
90	5.0	250	13.9
95	5.3	260	14.4
100	5.6	270	15.0
105	5.8	280	15.5
110	6.1	290	16.1
115	6.4	300	16.7
120	6.7	320	17.8
125	6.9	340	18.9
126	7.0	350	19.4
130	7.2	360	20.0
135	7.5	380	21.1
140	7.8	400	22.2
145	8.0	450	25.0
150	8.3	500	27.8
155	8.6	550	30.5
160	8.9	600	33.3

mmol/L to mg/dL Chart

mmol/L	mg/dL	mmol/L	mg/dL
2.0	36	8.5	153
2.5	45	9.0	162
3.0	54	9.5	171
3.5	63	10.0	180
3.9	70	11.0	198
4.0	72	12.0	216
4.5	81	13.0	234
5.0	90	14.0	252
5.5	99	15.0	270
6.0	108	16.0	288
6.5	117	18.0	324
7.0	126	20.0	360
7.5	135	25.0	450
8.0	144	30.0	541

What Your Reading Means (Both Units)

The ADA uses the following diagnostic thresholds. A single reading is not a diagnosis — laboratory confirmation and clinical evaluation are required.

Fasting Blood Glucose

Category	mg/dL	mmol/L
Hypoglycemia	< 70	< 3.9
Normal	70–99	3.9–5.5
Prediabetes (impaired fasting glucose)	100–125	5.6–6.9
Diabetes range	≥ 126	≥ 7.0

2-Hour Post-Meal / OGTT

Category	mg/dL	mmol/L
Normal	< 140	< 7.8
Prediabetes (impaired glucose tolerance)	140–199	7.8–11.0
Diabetes range	≥ 200	≥ 11.1

Thresholds: ADA Standards of Care — Classification and Diagnosis of Diabetes. Diagnosis requires confirmation by a healthcare provider.

ADA Blood Glucose Targets (2024)

Target	mg/dL	mmol/L
Fasting / pre-meal	80–130	4.4–7.2
1-hour post-meal	< 140	< 7.8
2-hour post-meal	< 180	< 10.0
Hypoglycemia alert	< 70	< 3.9
Severe hypoglycemia	< 54	< 3.0
Pregnancy fasting	< 95	< 5.3
Pregnancy 1-hr post-meal	< 140	< 7.8

Source: ADA Standards of Medical Care in Diabetes 2024.

Conversion Formula

mmol/L = mg/dL ÷ 18.016 · mg/dL = mmol/L × 18.016

The factor 18.016 is the molecular weight of glucose (180.16 g/mol) divided by 10. Often rounded to 18 for quick mental math.

Which Countries Use mg/dL vs mmol/L?

The same blood glucose reading is written two ways depending on where you are. mg/dL (milligrams per decilitre) is standard in the United States, and also common across much of Latin America, the Middle East, Japan, and parts of Europe. mmol/L (millimoles per litre) is the SI unit used in the United Kingdom, Canada, Australia, New Zealand, China, and most of Europe.

The numbers look very different — 180 mg/dL and 10.0 mmol/L are the same glucose level — which is why travellers, people using a meter bought abroad, and anyone reading research from another country need a quick conversion. The relationship is fixed, so this converter is exact, not an estimate.

Frequently Asked Questions

How do I convert mg/dL to mmol/L?

Divide the mg/dL value by 18.016 (often rounded to 18). For example, 180 mg/dL ÷ 18 = 10.0 mmol/L. To go the other way, multiply the mmol/L value by 18.016.

What is 180 mg/dL in mmol/L?

180 mg/dL equals 10.0 mmol/L. This is the ADA's upper target for 2-hour post-meal glucose in most non-pregnant adults.

Why are there two units for blood glucose?

mg/dL measures the mass of glucose per decilitre and is used mainly in the United States; mmol/L measures the number of glucose molecules per litre and is the SI unit used across most of the world. Both describe the identical glucose level.

Is the mg/dL to mmol/L conversion exact?

Yes. Unlike A1c-to-glucose estimates, this is a fixed mathematical relationship based on the molecular weight of glucose (180.16 g/mol), so the result is exact.

What is 100 mg/dL in mmol/L?

100 mg/dL equals 5.6 mmol/L. As a fasting value, this sits at the lower edge of the ADA prediabetes range (100–125 mg/dL fasting), so a fasting reading of 100 is worth discussing with your provider.

What is 120 mg/dL in mmol/L?

120 mg/dL equals 6.7 mmol/L. This is within the ADA pre-meal target range for most adults with diabetes (80–130 mg/dL) and is also the ADA 2-hour post-meal upper target for pregnancy.

What is 140 mg/dL in mmol/L?

140 mg/dL equals 7.8 mmol/L. On a 2-hour oral glucose tolerance test, 140–199 mg/dL (7.8–11.0 mmol/L) is the ADA prediabetes range; below 140 is normal. It is also the ADA 1-hour post-meal upper target.

What is 126 mg/dL in mmol/L?

126 mg/dL equals 7.0 mmol/L. A fasting glucose of 126 mg/dL or higher, confirmed on repeat testing, is the ADA diagnostic threshold for diabetes.

What is 10 mmol/L in mg/dL?

10 mmol/L equals 180 mg/dL. This is the ADA upper target for 2-hour post-meal glucose in most non-pregnant adults, and a common CGM high-alert setting.

What is 11 mmol/L in mg/dL?

11 mmol/L equals 198 mg/dL — essentially the 200 mg/dL (11.1 mmol/L) threshold. A random glucose of 200 mg/dL or higher with symptoms, or a 2-hour OGTT value at that level, is in the ADA diabetes diagnostic range.

Last reviewed: July 2026 · ADA Standards of Care 2024