How do I convert blood sugar from mg/dL to mmol/L?

Divide mg/dL by 18.0182 (or approximately 18) to get mmol/L. For example, 126 mg/dL ÷ 18 = 7.0 mmol/L. To convert the other way, multiply mmol/L by 18.

What is a normal blood sugar level?

Normal fasting blood sugar is 70-99 mg/dL (3.9-5.5 mmol/L). Pre-diabetes range is 100-125 mg/dL (5.6-6.9 mmol/L). Diabetes is diagnosed at 126 mg/dL (7.0 mmol/L) or higher on two separate tests.

Which countries use mg/dL vs mmol/L?

The US, Japan, France, and some other countries use mg/dL. The UK, Canada, Australia, and most of Europe use mmol/L. Knowing the conversion is essential when traveling with diabetes or reading international medical literature.

Blood Sugar: mg/dL to mmol/L Conversion Guide

The Conversion Formula

mmol/L = mg/dL ÷ 18.0182

mg/dL = mmol/L × 18.0182

The factor 18.0182 comes from the molecular weight of glucose (180.182 g/mol) divided by 10.

Blood Sugar Reference Ranges

Status	Fasting (mg/dL)	Fasting (mmol/L)
Low (hypoglycemia)	<70	<3.9
Normal	70-99	3.9-5.5
Pre-diabetes	100-125	5.6-6.9
Diabetes	≥126	≥7.0
Target (2hr post-meal)	<140	<7.8
High (hyperglycemia)	>180	>10.0
Dangerously high	>400	>22.2

Quick Conversion Chart

mg/dL	mmol/L	mg/dL	mmol/L
60	3.3	160	8.9
70	3.9	180	10.0
80	4.4	200	11.1
90	5.0	250	13.9
100	5.6	300	16.7
120	6.7	350	19.4
140	7.8	400	22.2

A1C to Average Blood Sugar

A1C (%)	Avg mg/dL	Avg mmol/L
5.0	97	5.4
6.0	126	7.0
7.0	154	8.6
8.0	183	10.2
9.0	212	11.8
10.0	240	13.4

Note: This guide is for educational purposes. Always consult your healthcare provider for medical advice.