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Blood Sugar Converter

Convert blood glucose between mg/dL and mmol/L with normal range reference.

Reference ranges
Statusmg/dLmmol/L
Fasting2h post-mealFasting2h post-meal
Normal70–99< 1403.9–5.5< 7.8
Pre-diabetes100–125140–1995.6–6.97.8–11.0
Diabetesβ‰₯ 126β‰₯ 200β‰₯ 7.0β‰₯ 11.1

For reference only. Consult a healthcare professional for medical advice.

Blood sugar levels are measured in two different units depending on your country: mg/dL (milligrams per deciliter), used in the United States and several other countries, and mmol/L (millimoles per liter), used in Europe, Canada, Australia, and most of the world. Converting between these units is essential when reading international medical literature, using a glucometer from another country, or discussing results with healthcare providers abroad.

To convert mg/dL to mmol/L, divide by 18.018. To convert mmol/L to mg/dL, multiply by 18.018. For example, a fasting blood glucose of 100 mg/dL equals approximately 5.6 mmol/L. This tool performs the conversion instantly in both directions and displays a reference table of clinically significant thresholds.

Normal fasting blood glucose is typically below 100 mg/dL (5.6 mmol/L). Prediabetes is indicated between 100–125 mg/dL (5.6–6.9 mmol/L), and a diagnosis of diabetes is generally made at 126 mg/dL (7.0 mmol/L) or higher on two separate occasions.

Frequently Asked Questions

Code Implementation

# Blood glucose unit conversion
# Molecular weight of glucose = 180.182 g/mol
# Factor = 18.0182

FACTOR = 18.0182

def mgdl_to_mmoll(mgdl: float) -> float:
    """Convert blood glucose from mg/dL to mmol/L."""
    return mgdl / FACTOR

def mmoll_to_mgdl(mmoll: float) -> float:
    """Convert blood glucose from mmol/L to mg/dL."""
    return mmoll * FACTOR

def classify_fasting(mgdl: float) -> str:
    """Classify fasting blood glucose level (ADA guidelines)."""
    if mgdl < 70:
        return "Low (Hypoglycaemia)"
    elif mgdl < 100:
        return "Normal"
    elif mgdl < 126:
        return "Pre-diabetes"
    else:
        return "Diabetes range"

# Example conversions
values_mgdl = [54, 70, 90, 100, 126, 180, 250]
print(f"{'mg/dL':>8}  {'mmol/L':>8}  {'Category'}")
print("-" * 40)
for v in values_mgdl:
    mmol = mgdl_to_mmoll(v)
    category = classify_fasting(v)
    print(f"{v:>8}  {mmol:>8.1f}  {category}")

# Reverse conversion
print("\nmmol/L β†’ mg/dL:")
for v in [3.9, 5.5, 7.0, 10.0]:
    mgdl = mmoll_to_mgdl(v)
    print(f"{v} mmol/L = {mgdl:.1f} mg/dL")

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