Blood Sugar Checker & Converter
Glucose Health Tool
Blood Sugar
Checker & Converter
Enter your glucose reading and instantly find out your blood sugar category, what it means for your health, and what to do next — based on ADA and WHO guidelines. Converts mg/dL ↔ mmol/L automatically.
ADA & WHO Guidelines
Instant mg/dL ↔ mmol/L
100% Free
Live Reading
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mg/dL
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Reading
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mmol/L
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Category
Enter Your Reading
Normal fasting: 70–99 mg/dL
Choose when the sample was taken
Targets and advice differ slightly by age group
Quick convert: 95 mg/dL = 5.3 mmol/L
FASTING
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Where Your Reading Falls (Fasting Scale, mg/dL)
LowNormalPrediabetesDiabetesSevere
Low
<70 mg/dL
Normal
70–99 mg/dL
Prediabetes
100–125 mg/dL
Diabetes
126–249 mg/dL
Severe
≥250 mg/dL
Content reviewed against current American Diabetes Association (ADA) Standards of Care and WHO diagnostic criteria by the Daily Health Tools team. Last updated: July 2026.
Estimated A1C Calculator
If you know your average blood sugar over the last 2–3 months (from a CGM or repeated logs), estimate your A1C using the ADA’s eAG formula.
Uses the unit selected above
—%
Enter your average glucose to see the estimate.
Blood Sugar Log & Trend
Track readings over time to spot patterns. Saved only in this browser — never sent anywhere.
Your log is stored locally in this browser only (not uploaded or shared).
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ADA / WHO Blood Sugar Reference Chart
| Category | Fasting | 2 Hrs After Eating | What to Do |
|---|---|---|---|
Low (Hypoglycemia) | Below 70 mg/dL (3.9 mmol/L) | Below 70 mg/dL (3.9 mmol/L) | Consume fast-acting sugar; recheck in 15 min |
Normal | 70–99 mg/dL (3.9–5.5 mmol/L) | Below 140 mg/dL (7.8 mmol/L) | Maintain healthy lifestyle; recheck annually |
Prediabetes | 100–125 mg/dL (5.6–6.9 mmol/L) | 140–199 mg/dL (7.8–11.0 mmol/L) | Lifestyle changes; recheck in 3–6 months |
Diabetes | 126 mg/dL or higher (7.0 mmol/L+) | 200 mg/dL or higher (11.1 mmol/L+) | Consult doctor; confirm with A1C test |
Severely High | 250 mg/dL or higher (13.9 mmol/L+) | 250 mg/dL or higher (13.9 mmol/L+) | ⚠️ Seek medical care; risk of ketoacidosis |
mg/dL ↔ mmol/L Quick Conversion Table
| mg/dL | mmol/L | mg/dL | mmol/L | mg/dL | mmol/L |
|---|---|---|---|---|---|
| 70 | 3.9 | 140 | 7.8 | 250 | 13.9 |
| 90 | 5.0 | 160 | 8.9 | 300 | 16.7 |
| 100 | 5.6 | 180 | 10.0 | 350 | 19.4 |
| 126 | 7.0 | 200 | 11.1 | 400 | 22.2 |
Formula: mmol/L = mg/dL ÷ 18. mg/dL = mmol/L × 18.
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What Is Blood Sugar (Glucose)?
Blood sugar, or blood glucose, is the amount of sugar circulating in your bloodstream, used by your cells for energy. It’s measured in milligrams per deciliter (mg/dL) in the US, or millimoles per liter (mmol/L) in most other countries. A fasting reading of 70–99 mg/dL (3.9–5.5 mmol/L) is considered normal by the American Diabetes Association (ADA).
Your blood sugar rises after eating and falls during fasting or exercise. Consistently high readings over time can signal prediabetes or diabetes, while consistently low readings can indicate hypoglycemia, which needs prompt attention.
mg/dL vs mmol/L — What’s the Difference?
mg/dL (milligrams per deciliter) — The standard unit used in the United States and a few other countries.
mmol/L (millimoles per liter) — The standard unit used in the UK, Canada, Australia, and most of Europe and Asia. To convert, divide mg/dL by 18, or multiply mmol/L by 18.
What Causes High Blood Sugar?
- Insulin resistance — Cells stop responding well to insulin, a hallmark of type 2 diabetes
- Carbohydrate-heavy meals — Refined carbs and sugary foods spike glucose quickly
- Lack of physical activity — Exercise helps muscles absorb glucose from the blood
- Stress and illness — Stress hormones like cortisol raise blood sugar
- Missed or insufficient medication — Skipped insulin or oral diabetes medication
- Family history — Genetics significantly influence diabetes risk
- Excess body weight — Especially abdominal fat, which worsens insulin resistance
How to Manage Blood Sugar Naturally
- Choose high-fiber, low-glycemic foods over refined carbs and sugary drinks
- Exercise regularly — even a 15-minute walk after meals lowers post-meal spikes
- Stay hydrated; water helps kidneys flush out excess sugar
- Maintain a healthy weight, especially reducing abdominal fat
- Get 7–9 hours of quality sleep — poor sleep raises insulin resistance
- Manage stress through breathing exercises, yoga, or meditation
- Monitor your levels consistently and share logs with your doctor
⚕️ Medical Disclaimer: This tool is for informational purposes only and is not a substitute for professional medical advice. Always consult a qualified healthcare provider for diagnosis and treatment, especially before adjusting insulin or diabetes medication.
Frequently Asked Questions
A normal fasting blood sugar level is 70–99 mg/dL (3.9–5.5 mmol/L). Two hours after eating, normal blood sugar is below 140 mg/dL (7.8 mmol/L). These ranges follow American Diabetes Association (ADA) guidelines.
Divide the mg/dL value by 18 to get mmol/L. For example, 90 mg/dL ÷ 18 = 5.0 mmol/L. To go the other way, multiply mmol/L by 18 to get mg/dL.
A fasting blood sugar of 126 mg/dL (7.0 mmol/L) or higher on two separate tests indicates diabetes. A random reading of 200 mg/dL (11.1 mmol/L) or higher, together with symptoms like thirst or frequent urination, also indicates diabetes per ADA criteria.
People without diabetes typically don’t need daily checks. Those with prediabetes should check periodically as advised by a doctor. People with diabetes, especially on insulin, often check 2–4+ times daily — fasting, before meals, and 2 hours after meals.
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