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Peptide Reconstitution / Dosage Calculator
Work out the concentration after reconstitution and how many units to draw on a U-100 insulin syringe for a prescribed dose.
A1C Calculator
Convert hemoglobin A1C to estimated average glucose (eAG) in mg/dL or mmol/L, or back again, with ADA ranges.
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How to use this calculator
Enter your values after choosing the type of calculation in the tabs. The result updates as you type; press Calculate to confirm and jump to the result on mobile. Use Share to send the calculator with your result.
A1C to eAG formula
eAG (mg/dL) = 28.7 × A1C − 46.7
eAG (mmol/L) = eAG (mg/dL) ÷ 18.016
IFCC (mmol/mol) = (A1C − 2.15) × 10.929
The formula comes from the international A1C-Derived Average Glucose (ADAG) study, Nathan et al., Diabetes Care 2008, which compared A1C with months of continuous glucose readings. Example: A1C 7% → 28.7 × 7 − 46.7 = 154 mg/dL (8.6 mmol/L).
A1C ranges (ADA)
| A1C | Category |
|---|---|
| Below 5.7% | Normal |
| 5.7% – 6.4% | Prediabetes |
| 6.5% or higher | Diabetes (confirmed by repeat testing) |
Cut-offs from the American Diabetes Association Standards of Care. Many adults with diabetes aim for an A1C below 7%, but targets are set individually with a clinician.
Quick conversion chart
| A1C | eAG mg/dL | eAG mmol/L |
|---|---|---|
| 5% | 97 | 5.4 |
| 5.7% | 117 | 6.5 |
| 6% | 125 | 7 |
| 6.5% | 140 | 7.8 |
| 7% | 154 | 8.6 |
| 8% | 183 | 10.2 |
| 9% | 212 | 11.7 |
| 10% | 240 | 13.3 |
| 11% | 269 | 14.9 |
| 12% | 298 | 16.5 |
Frequently asked questions
What average blood sugar is an A1C of 7?
About 154 mg/dL (8.6 mmol/L).
What A1C level is prediabetes?
5.7% to 6.4%, per the American Diabetes Association.
Why doesn’t my meter average match my eAG?
Finger-stick readings sample only certain moments; A1C reflects about 2–3 months of glucose and is affected by red blood cell lifespan.
About this tool
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- Last updated
- 31 Oct 2026
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