300 mg/dL to mmol/L: 300 mg/dL is 16.7 mmol/L

300 mg/dL converted to:

16.7

mmol/L

If this was a fasting reading

Very High Blood Sugar

This is a very high blood sugar reading. Sustained readings above 252 mg/dL (14 mmol/L) can cause symptoms including extreme thirst, frequent urination, and fatigue, and over time contribute to serious complications. If this reading is unexpected or you are feeling unwell, contact your doctor or diabetes care team promptly.

If this was 1 to 2 hours after a meal

Diabetic range

After-meal range: 200 mg/dL or above (11.1 mmol/L or above).

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For general information only. Always discuss your readings with your doctor or diabetes care team.

Readings Near 300 mg/dL

mg/dL ÷ 18.018 = mmol/L. These are the nearby values from our full blood sugar conversion chart.

mg/dL	mmol/L
290	16.1
295	16.4
300	16.7
305	16.9
310	17.2

Important: These are general reference ranges, not personalized targets. Your individual targets may differ depending on your age, the type of diabetes you have, your medication, and other health factors. Always follow the guidance given by your doctor or diabetes care team rather than general population ranges.

This tool is for general informational purposes only and does not constitute medical advice. Blood sugar ranges shown are general population guidelines and may not reflect your individual targets. Always consult your doctor or diabetes care team for personalized guidance.

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