Blood Sugar Converter

What this tool does

Blood Sugar Converter converts a blood glucose reading between mg/dL (the unit commonly used in the US) and mmol/L (used in most other countries), using the exact molar-mass-based conversion factor, and shows a general reference category based on commonly published fasting or post-meal ranges.

Blood glucose is reported in mg/dL in the United States and a handful of other countries, but in mmol/L almost everywhere else, which means a glucose meter, lab report or medical reference written for one convention can be hard to interpret directly if you’re used to the other.

This converter applies the exact conversion factor between the two units, based on glucose’s molar mass, and additionally shows a general reference category drawn from commonly published fasting or post-meal ranges, purely for orientation. This is general information, not medical advice: your own target ranges, especially if you’re pregnant, a child, or on glucose-affecting medication, should always come from your healthcare provider rather than a generic chart.

How to use Blood Sugar Converter

1. Enter the Blood glucose value you have.
2. Choose its Unit: mg/dL or mmol/L.
3. Choose the Reading context: fasting, or post-meal / random.
4. Read the converted value in the other unit.
5. Check the General reference category for orientation, keeping in mind it is not personalised medical guidance.

Tips for better results

• The conversion factor (1 mmol/L = 18.0182 mg/dL) comes directly from glucose’s molar mass and is exact; only the reference-range categorisation is a general approximation.
• Fasting and post-meal readings use different reference ranges, which is why the Reading context selector matters for the categorisation shown.
• This tool’s reference ranges are general population guidance, not a diagnosis; a single reading outside the "normal" range is not the same as a diagnosis, and any concern should go to a healthcare provider.
• If you’re reading a lab report or device from a different country than you’re used to, converting the unit first is often the fastest way to make sense of an unfamiliar number.

Common use cases

• Converting a glucose meter reading from mmol/L to mg/dL, or vice versa, when comparing against a reference written in the other unit.
• Understanding a lab report or medical reference that uses an unfamiliar blood glucose unit.
• Getting a general sense of where a reading falls relative to commonly published ranges, before discussing it with a healthcare provider.
• Converting a known target range (often given by a doctor in one unit) into the other unit for use with a different meter or app.

Common mistakes to avoid

• Treating the reference range category as a diagnosis; it is a general orientation guide only, and any real health concern needs evaluation by a healthcare provider with your full medical context.
• Applying the fasting reference range to a post-meal reading, or vice versa, which will give a misleading categorisation since the two contexts have genuinely different expected ranges.
• Forgetting that personal target ranges can differ from general population ranges, especially for pregnancy, certain medical conditions, or specific medication regimens.