Blood sugar & metabolism
Blood Sugar Converter: mg/dL and mmol/L
Use this free blood sugar converter to switch a glucose reading between mg/dL and mmol/L instantly, so US and international numbers always make sense.
- Free to use
- Works on your phone
- Nothing saved or shared
How to use this converter
- Pick the direction you need, either mg/dL to mmol/L or the reverse.
- Type in your blood sugar reading.
- Press Convert to see the same reading in the other unit.
Why two different units exist
This blood sugar level converter handles the fact that countries measure the same thing on two different scales. The United States uses milligrams per decilitre (mg/dL). The United Kingdom, Canada, Australia, and most of Europe use millimoles per litre (mmol/L). Moving from mg/dL to mmol/L, or back again, lets a number from a relative abroad, an old record, or an imported meter always make sense.
Blood sugar conversion chart
This blood sugar converter chart shows some common readings side by side in both units. The calculator above gives your exact figure, but the chart is handy for a quick look.
| mg/dL | mmol/L |
|---|---|
| 70 | 3.9 |
| 90 | 5.0 |
| 100 | 5.6 |
| 126 | 7.0 |
| 140 | 7.8 |
| 180 | 10.0 |
| 200 | 11.1 |
| 250 | 13.9 |
For what these numbers mean for you, and for your own healthy targets, speak with your doctor or diabetes nurse, who can also help you weigh up natural ways to support blood sugar alongside any care plan.
Answers
Frequently asked questions
How do you convert blood sugar from mg/dL to mmol/L?
Divide the mg/dL number by 18 to get mmol/L. To go the other way, multiply mmol/L by 18. For example, 100 mg/dL is about 5.6 mmol/L, and 7 mmol/L is about 126 mg/dL.
Which unit does my country use?
The United States and a few other countries use mg/dL. The United Kingdom, Canada, Australia, and most of Europe use mmol/L. Your glucose meter and lab report will show one or the other.
What is a normal fasting blood sugar?
For someone without diabetes, a normal fasting blood sugar is usually between 70 and 99 mg/dL, which is about 3.9 to 5.5 mmol/L. Ranges for people with diabetes are often set individually by their doctor.
Is this converter the same as an A1c reading?
No. This converter only changes the units of a single glucose reading. A1c is a separate test that reflects your average blood sugar over 2 to 3 months. If you want to turn an A1c into an average glucose, use our A1c calculator instead.
What blood sugar level is considered too high?
For many people, a fasting reading of 126 mg/dL (7.0 mmol/L) or higher points to diabetes. Readings above about 180 mg/dL (10 mmol/L) after meals are often called high. Personal targets vary, so check yours with your doctor.
Can I convert my A1c to blood sugar with this tool?
Not with this one. This tool converts a single glucose reading between mg/dL and mmol/L. To turn an A1c percentage into an average blood sugar, use our A1c calculator at /tools/a1c-calculator instead, which is built for that.
What units does this blood sugar converter use?
It switches between mg/dL, the unit used in the United States, and mmol/L, the unit used in the United Kingdom, Canada, Australia, and most of Europe. Your meter and lab report will show one of the two.