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A1C Calculator

Convert an A1C (HbA1c) result to the estimated average glucose it represents, in mg/dL and mmol/L, or estimate A1C from your average glucose. It uses the ADAG study formula eAG = 28.7 × A1C − 46.7 and is for information only.

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%
Enter your values to see the result.
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How to use the A1C Calculator

  1. Choose the direction: A1C to average glucose, or average glucose to A1C.
  2. Enter your A1C % from a lab report, or your average glucose and its unit.
  3. Press Convert to see the result in mg/dL, mmol/L and IFCC units.
  4. Use the chart below to compare other A1C values.
  5. Discuss your results with your healthcare provider; this tool does not diagnose.

The ADAG formula

  • eAG (mg/dL) = 28.7 × A1C − 46.7
  • eAG (mmol/L) = 1.59 × A1C − 2.59
  • A1C from eAG = (eAG mg/dL + 46.7) ÷ 28.7
  • IFCC (mmol/mol) = (A1C % − 2.15) × 10.929

The formula comes from the A1C-Derived Average Glucose (ADAG) study (Nathan et al., Diabetes Care, 2008), which compared A1C with frequent glucose measurements over three months.

A1C to average glucose chart

A1C %IFCC mmol/moleAG mg/dLeAG mmol/L
5.031975.4
5.7391176.5
6.0421267.0
6.5481407.7
7.0531548.5
8.06418310.1
9.07521211.7
10.08624013.3
12.010829816.5

For information only. Individual targets differ, so ask your healthcare provider which range is right for you.

Frequently asked questions

How do you convert A1C to average glucose?

Use the ADAG formula: estimated average glucose (mg/dL) = 28.7 × A1C − 46.7. An A1C of 7% equals about 154 mg/dL (8.5 mmol/L). In mmol/L the formula is 1.59 × A1C − 2.59.

What A1C levels define prediabetes and diabetes?

Under American Diabetes Association criteria, an A1C below 5.7% is in the normal range, 5.7% to 6.4% indicates prediabetes, and 6.5% or higher is in the diabetes range. A diagnosis is normally confirmed by repeat testing.

What is IFCC mmol/mol?

Many countries report HbA1c in IFCC units (mmol/mol) instead of percent. The conversion is mmol/mol = (A1C% − 2.15) × 10.929, so 6.5% is about 48 mmol/mol and 7% about 53 mmol/mol.

Why does my meter average not match my A1C?

A1C reflects roughly the last two to three months, weighted toward the most recent weeks, while a meter average depends on when you test. Fingersticks often miss overnight or after-meal highs. Conditions like anemia or hemoglobin variants can also shift A1C.

How accurate is estimated average glucose?

eAG is a population estimate. In the ADAG study, the same A1C corresponded to a range of real averages between people, so treat it as a guide rather than an exact value.

Is this a medical tool?

No. It is an information-only converter. It does not give treatment or dosing advice. Talk to a healthcare professional about your results.

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