Blood Sugar Converter
Switch Between mg/dL and mmol/L Instantly
Blood Sugar Converter
Convert units and check your reading
This tool uses American Diabetes Association (ADA) blood glucose categories and reflects a single reading only. Diagnosis of diabetes requires repeat testing and/or HbA1c, done by a doctor. Not a substitute for professional medical advice.
What is Blood Sugar Converter?
Blood glucose (blood sugar) levels are reported in two different units globally: milligrams per deciliter (mg/dL) used in the USA, Pakistan, and some other countries, and millimoles per liter (mmol/L) used in the UK, Canada, Australia, and Europe.
When switching glucometers, traveling, or reading international medical literature, converting between these units is essential. The conversion factor is 18.0182 (often rounded to 18).
Why does this matter?
Using the wrong unit when managing diabetes can lead to dangerous misinterpretation of your glucose levels. A reading of "7" means very different things in mg/dL (extremely low — hypoglycemia) vs mmol/L (normal fasting level).
How to Use This Tool
- Enter your blood glucose reading as a number.
- Select whether you are converting FROM mg/dL to mmol/L, or FROM mmol/L to mg/dL.
- Click "Convert" to see the equivalent value.
- Use the reference table below to interpret what the converted value means clinically.
Tips for Accurate Results
- Always double-check the unit on your glucometer — it should be displayed on the screen.
- Fasting means no food or caloric drink for at least 8 hours before testing.
- Post-meal (postprandial) glucose is measured 2 hours after the start of eating.
- Keep a log of your readings with the date, time, and what you ate for your doctor.
Frequently Asked Questions
How do I change my glucometer from mmol/L to mg/dL?
Most glucometers have a settings menu where you can change the unit. Check your device manual. Some require holding specific buttons during startup. Contact your device manufacturer for model-specific instructions.
Is a blood sugar of 7 good or bad?
“7” means completely different things by unit. 7 mmol/L fasting is the threshold for a diabetes diagnosis. 7 mg/dL would be dangerously low for hypoglycemia. Always specify the unit when sharing or discussing glucose readings.
What should my blood sugar be before and after meals?
For people without diabetes: fasting 70–99 mg/dL (3.9–5.5 mmol/L), 2-hr post-meal <140 mg/dL (<7.8 mmol/L). For people with diabetes (ADA targets): fasting 80–130 mg/dL (4.4–7.2 mmol/L), 2-hr post-meal <180 mg/dL (<10.0 mmol/L). Individual targets set by your doctor may differ.
Can I use this converter for HbA1c?
No. HbA1c is a different test measuring 3-month average blood glucose, reported as a percentage. Use the HbA1c Converter on this platform for that conversion.
- Medical Disclaimer: This tool is for informational and educational purposes only. It does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional before making health decisions.
How to Use This Tool
- Fasting < 70 mg/dL (< 3.9 mmol/L) — Hypoglycemia — Low blood sugar, act quickly
- Fasting 70–99 mg/dL (3.9–5.5 mmol/L) — Normal Fasting Glucose
- Fasting 100–125 mg/dL (5.6–6.9 mmol/L) — Pre-Diabetes (Impaired Fasting Glucose)
- Fasting ≥126 mg/dL (≥7.0 mmol/L) — Diabetes (if confirmed on 2 occasions)
- 2-hr Post-meal < 140 mg/dL (< 7.8 mmol/L) — Normal Post-meal Glucose
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