A1C to Average Blood Sugar

Convert HbA1c (%) or IFCC (mmol/mol) to estimated average glucose. You enter the lab number.

100% free. Runs entirely in your browser - your files and data never leave your device and nothing is uploaded to any server.

You have

Estimated average glucose114 mg/dL6.3 mmol/L · A1C 5.6% (38 mmol/mol)Below the usual diabetes screening cut-off

ADA conversion: eAG mg/dL = 28.7 x A1C - 46.7. Screening cut-offs: under 5.7% usual, 5.7 to 6.4% prediabetes range, 6.5%+ diabetes range. A lab result still needs a clinician.

Estimates only. Not medical advice and not a diagnosis. Talk to a clinician about your own numbers. Do not change medication from this page.

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About this tool

HbA1c is a lab measure of average blood glucose over roughly three months. You type the number from your own report; nothing is measured on this page. The ADA conversion used here is eAG (mg/dL) = 28.7 times A1C percent minus 46.7. Screening cut-offs often quoted are under 5.7% usual, 5.7 to 6.4% prediabetes range, and 6.5% or higher diabetes range. Those bands do not diagnose you from a website. Trends, symptoms and other labs matter. Estimates only. Not medical advice and not a diagnosis. Do not change medication from this calculator.

How to use this tool

  1. Choose A1C %, mmol/mol or eAG mg/dLUse the units printed on your lab report. Switching units keeps the same underlying percent.
  2. Type the numberConversion and the screening band update immediately.
  3. Take the printout to a clinicianA website band is not a diagnosis. Do not change tablets or insulin from this page.

Key features

  • ADA eAG in mg/dL and mmol/L from NGSP percent.
  • IFCC mmol/mol conversion both ways.
  • Reverse from estimated average glucose if that is what you have.
  • Clear screening labels that still say they are not a diagnosis.

Common uses

  • Translating a 7% A1C into an estimated average glucose around 154 mg/dL.
  • Matching a US percent report with a European mmol/mol report.
  • Understanding a number before an appointment, not instead of one.

Tips for better results

  • Use the same lab method when you compare two dates. NGSP percent and IFCC mmol/mol are different scales.
  • Anaemia, kidney disease and some haemoglobin variants can skew A1C. A clinician knows when to use another test.
  • Glucometer averages are not the same as eAG from A1C, but they should be in the same neighbourhood.

Mistakes to avoid

  • Calling this page a diagnosis of diabetes or prediabetes.
  • Changing insulin or tablets because the converter showed a high eAG.
  • Mixing mmol/mol (A1C) with mmol/L (glucose).
  • Ignoring symptoms because a single A1C sat under 5.7%.

Frequently asked questions

eAG mg/dL = 28.7 x A1C minus 46.7. Divide mg/dL by 18.0182 for mmol/L. That is the ADA estimate, not a glucometer reading. A1C 7% is about 154 mg/dL.

Labs and guidelines often use 6.5% or higher as a diabetes screening cut-off, with confirmation rules. Only a clinician diagnoses.

No. mmol/mol is IFCC HbA1c. mmol/L is glucose. This page converts both ways so you can match your report.

No. You enter a number you already have. There is no test kit and no upload of a lab PDF.

Yes. It is free for normal use with no account required. It is not medical advice.

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