Convert your blood sugar levels between mmol/L and mg/dL with this Blood Sugar Converter. Enter a value in either the mmol/L or mg/dL field and get the converted result immediately — helpful for understanding glucose readings from different meters, labs, or international sources.
Converted Blood Sugar
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Result Unit
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Glucose Category
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Value in mmol/L
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Value in mg/dL
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Both units measure the concentration of glucose in your blood, but they use different scales. mmol/L (millimoles per litre) is used in the UK, Canada, Australia, and most of Europe, while mg/dL (milligrams per decilitre) is standard in the USA and many other countries. To convert mmol/L to mg/dL, multiply by 18.018.
Multiply your mmol/L reading by 18.018 to get mg/dL. For example, 5.5 mmol/L × 18.018 = 99 mg/dL. This converter does the calculation for you automatically.
Divide your mg/dL reading by 18.018 to get mmol/L. For example, 126 mg/dL ÷ 18.018 ≈ 7.0 mmol/L. Simply enter your mg/dL value and select the mg/dL → mmol/L direction above.
Many modern blood glucose meters allow you to switch between mmol/L and mg/dL in their settings menu. Check your meter's instruction manual for the specific steps, as the process varies by brand and model. If in doubt, contact the meter manufacturer's support line.
For most adults without diabetes, a normal fasting blood sugar is 3.9–5.6 mmol/L (70–100 mg/dL). Two hours after eating, levels below 7.8 mmol/L (140 mg/dL) are considered normal. These ranges can vary slightly depending on individual circumstances, so always consult your healthcare provider.
Monitoring blood sugar is essential for managing diabetes and preventing complications such as nerve damage, kidney disease, and cardiovascular problems. Consistently high levels (hyperglycaemia) or dangerously low levels (hypoglycaemia) both require medical attention. Regular monitoring helps you and your doctor make informed treatment decisions.
According to standard diagnostic criteria, a fasting blood glucose of 7.0 mmol/L (126 mg/dL) or higher on two separate occasions typically indicates diabetes. A reading of 6.1–6.9 mmol/L (110–125 mg/dL) fasting suggests impaired fasting glucose (pre-diabetes). Always seek a formal diagnosis from a healthcare professional.
A blood sugar below 3.0 mmol/L (54 mg/dL) is considered severely low (hypoglycaemia) and requires immediate treatment. Readings above 16.7 mmol/L (300 mg/dL) are considered dangerously high (hyperglycaemia) and may need urgent medical attention. If you experience symptoms of either condition, contact a healthcare provider immediately.