Glucose Units (mg/dL ↔ mmol/L)

The US and Korea report mg/dL while Europe uses mmol/L. Because of glucose’s molar mass you divide by 18 — 100 mg/dL is 5.6 mmol/L.

Your numbers

Glucose (mg/dL)(mg/dL)

mmol/L

5.56mmol/L

HbA1c (%)

5.1%

Formula

mmol/L = Glucose (mg/dL) ÷ 18

The second figure estimates the HbA1c that this glucose level would produce if sustained.

What to enter

Input	Default	Accepted range
Glucose (mg/dL) (mg/dL)Blood sugar; whether it is fasting or after a meal changes everything.	100	10 ~ 900

Step by step

Formulammol/L = Glucose (mg/dL) ÷ 18

With the default numbersmmol/L = 100 ÷ 18

Answermmol/L = 5.56 mmol/L

Quick reference table

Results when only Glucose (mg/dL) (mg/dL) changes and everything else stays put.

Glucose (mg/dL) (mg/dL)	mmol/L (mmol/L)	HbA1c (%) (%)
50	2.78	3.4
75	4.17	4.2
100	5.56	5.1
150	8.33	6.9
200	11.11	8.6

What each result means

Result	At default values
mmol/L (mmol/L)The European blood-sugar unit — mg/dL divided by 18.	5.56
HbA1c (%) (%)Blood sugar averaged over the past two to three months.	5.1

Common mistakes

The second figure estimates the HbA1c that this glucose level would produce if sustained.

Glossary

Glucose (mg/dL): Blood sugar; whether it is fasting or after a meal changes everything.
mmol/L: The European blood-sugar unit — mg/dL divided by 18.
HbA1c (%): Blood sugar averaged over the past two to three months.

Frequently asked questions

QHow is Glucose Units (mg/dL ↔ mmol/L) calculated?

mmol/L = Glucose (mg/dL) ÷ 18 — The US and Korea report mg/dL while Europe uses mmol/L. Because of glucose’s molar mass you divide by 18 — 100 mg/dL is 5.6 mmol/L.

QCan you walk through an example?

With Glucose (mg/dL) 100mg/dL, the answer is mmol/L 5.56mmol/L.

QWhat do I need to enter?

Enter Glucose (mg/dL). The result recalculates as you type, and an empty box counts as zero.

QHow much does the answer move if I change a number?

Changing only Glucose (mg/dL) (mg/dL) moves the answer to Glucose (mg/dL) (mg/dL) 50 → mmol/L (mmol/L) 2.78 and Glucose (mg/dL) (mg/dL) 200 → mmol/L (mmol/L) 11.11. The table below lays out five steps.

QHow are the numbers rounded?

Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.

QAnything to watch out for?

The second figure estimates the HbA1c that this glucose level would produce if sustained.

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These calculators help you understand health figures; they do not replace diagnosis or prescription. See a clinician if you have symptoms.