What it calculates

This tool converts blood glucose between mg/dL and mmol/L, in either direction. Indian labs and meters mostly use mg/dL, while reports from the UK and many other countries use mmol/L. The conversion only changes the unit, not the meaning of the reading.

What your result means

Glucose is reported in two unit systems. mg/dL is the weight of glucose in a fixed volume of blood, and mmol/L is the number of molecules in that volume. One mmol/L is about 18 mg/dL, because 180.16 grams of glucose make one mole.

A fasting reading of 100 mg/dL, for example, is about 5.6 mmol/L. Rounding means the converted value can differ slightly from what a meter shows when it converts internally.

What to do with the number

The converter only changes the unit. It does not say whether a reading is healthy. The ranges for fasting, after-meal and random readings are in normal blood sugar levels, and the three-month picture is explained in the HbA1c test.

When to talk to a doctor

If a reading worries you, or a report from abroad uses units you do not recognise, show it to your doctor. Do not change any medicine or insulin because of a converted number; your doctor will guide you.

How this tool works

Formula: mmol/L = mg/dL / 18. mg/dL = mmol/L × 18. The factor 18 comes from the molar mass of glucose (180.16 g/mol).
Source: American Diabetes Association Standards of Care in Diabetes (Diabetes Care); factor 18 derives from the molar mass of glucose, 180.16 g/mol
Version: 1.0.0

This tool does not replace a consultation. Results are general information; your doctor interprets them with your history and examination.

When to see an endocrinologist

Your reading is very high and you have vomiting, abdominal pain, fast breathing or drowsiness
Your reading is low and you feel shaky, sweaty or confused

Chest pain, fainting, severe breathlessness or confusion: call 108 or 112, or go to the nearest emergency department.

Book In-Person / Online Consultation

Blood sugar unit converter