Blood Sugar Converter

Convert blood glucose values between mg/dL (US units) and mmol/L (international units). Includes reference ranges for normal fasting, after-meal, and A1C.

Last updated September 8, 2026

Reference Ranges

Test Type	mg/dL	mmol/L
Fasting — Normal	70 – 99	3.9 – 5.5
Fasting — Prediabetic	100 – 125	5.6 – 6.9
Fasting — Diabetic	≥ 126	≥ 7.0
2-hour post-meal — Normal	< 140	< 7.8
2-hour post-meal — Diabetic	≥ 200	≥ 11.1

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