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Blood Sugar Calculator & Blood Glucose Converter — eAG, mg/dL ↔ mmol/L
Use our clinical-grade blood sugar calculator and blood glucose converter to translate lab reports and meter readings into actionable values. Convert between mg/dL and mmol/L, estimate average estimated glucose (eAG) from HbA1c, and interpret what results mean for risk and self-care.
Why a Blood Glucose Converter & eAG Matter
Different countries and labs use different units (mg/dL vs mmol/L). HbA1c indicates long-term average glucose — converting it to an average estimated glucose (eAG) helps patients and clinicians understand the number in everyday units measured at home.
Key terms (semantic & LSI)
average estimated glucose, eAG, HbA1c to eAG, blood glucose converter, blood sugar converter, blood sugar calculator, mg/dL to mmol/L, mmol/L to mg/dL
Quick reference & formulas
- Convert mg/dL to mmol/L: divide by 18. (e.g., 180 mg/dL ≈ 10.0 mmol/L)
- Convert mmol/L to mg/dL: multiply by 18. (e.g., 5.6 mmol/L ≈ 100.8 mg/dL)
- eAG formula (ADA): eAG (mg/dL) = 28.7 × HbA1c (%) − 46.7
- eAG to mmol/L: eAG (mmol/L) = eAG (mg/dL) ÷ 18
Conversion examples
| Measure | Input | Converted / eAG |
|---|---|---|
| Fasting glucose | 100 mg/dL | ≈ 5.6 mmol/L |
| Random glucose | 180 mg/dL | ≈ 10.0 mmol/L |
| HbA1c | 6.5% | eAG ≈ 140 mg/dL (7.8 mmol/L) |
| HbA1c | 7.0% | eAG ≈ 154 mg/dL (8.6 mmol/L) |
Interpreting results — practical guidance
- Normal fasting glucose: approximately 70–99 mg/dL (3.9–5.5 mmol/L).
- Prediabetes (fasting): 100–125 mg/dL (5.6–6.9 mmol/L); HbA1c 5.7%–6.4% is considered prediabetes.
- Diabetes thresholds: fasting ≥126 mg/dL (≥7.0 mmol/L) or HbA1c ≥6.5% (confirm with repeat testing and clinician evaluation).
Pros & cons: converters and eAG
Pros
- Translates lab HbA1c into an average glucose value patients understand.
- Removes confusion when different units are used in different regions.
Cons
- eAG is an estimate; conditions like anemia, hemoglobin variants, or recent transfusion can make HbA1c misleading.
- Meter accuracy varies — use lab-confirmed tests for diagnostic decisions.
Internal linking opportunities (5–7)
- BMI Calculator — link when discussing metabolic risk.
- Calorie Calculator — for dietary adjustments to improve glucose control.
- Blood Sugar Calculator (main) — link to your FINDRISC / risk tools.
- Cardiovascular Risk Calculator — metabolic and CV risk overlap.
- BMR Calculator — link when discussing energy needs and weight management.
- Privacy Policy — visible near forms and inputs for transparency.
Advanced FAQ
Frequently Asked Questions
Q1: What is average estimated glucose (eAG)?
A: eAG converts an HbA1c percentage into an estimated average blood glucose value (mg/dL or mmol/L) that reflects the average over the previous 2–3 months using validated formulas.
Q2: How do I convert mg/dL to mmol/L and back?
A: Divide mg/dL by 18 to get mmol/L. Multiply mmol/L by 18 to get mg/dL. Example: 90 mg/dL ≈ 5.0 mmol/L; 5 mmol/L ≈ 90 mg/dL.
Q3: Is eAG the same as daily finger-stick average?
A: eAG is an average estimated from HbA1c and is useful for long-term trends; finger-stick readings show day-to-day variation and are needed for immediate treatment decisions.
Q4: Can HbA1c be inaccurate for some people?
A: Yes — conditions like anemia, hemoglobin variants, kidney disease, or recent blood loss/transfusion can affect HbA1c accuracy. Alternate measures (fructosamine) may be advised in such cases.
Q5: When should I see a clinician about my blood sugar results?
A: If fasting glucose ≥126 mg/dL, random ≥200 mg/dL with symptoms, or HbA1c ≥6.5%, seek clinical evaluation for diagnostic testing and management.
Q6: How accurate are home glucose meters?
A: Most modern meters are accurate within acceptable ranges, but meter calibration, strip quality, and technique affect readings. Use lab tests for diagnosis and confirm surprising results with a clinician.
Q7: How often should I test HbA1c?
A: For people with diabetes, usually every 3 months if therapy changed or control unstable; otherwise every 3–6 months depending on clinician guidance.
Q8: What does a mismatch between eAG and finger-stick logs mean?
A: Investigate meter technique, timing of tests, biological factors (e.g., hemoglobin issues), and see your clinician to reconcile differences.