Home > Tools > A1C conversion chart

A1C conversion chart

A1C (also called HbA1c) is a lab test that reflects your average blood glucose over roughly the past 2–3 months. Many labs also report an estimated average glucose (eAG), which translates an A1C % into the same units you see on a glucose meter or CGM (mg/dL in the U.S., mmol/L in many other countries).

This chart converts A1C values from 1.0% to 20.0% into eAG using the regression equation from the ADAG study (commonly used for lab-reported eAG):

  • eAG (mg/dL) = 28.7 × A1C − 46.7
  • eAG (mmol/L) = (28.7 × A1C − 46.7) ÷ 18

A1C categories (common reference ranges):

  • Normal: below 5.7%
  • Prediabetes: 5.7%–6.4%
  • Diabetes: 6.5% or above
A1C (%) Glucose (eAG) mg/dL Glucose (eAG) mmol/L
1.0-18-1
1.1-15-0.8
1.2-12-0.7
1.3-9-0.5
1.4-7-0.4
1.5-4-0.2
1.6-1-0.1
1.720.1
1.850.3
1.980.4
2.0110.6
2.1140.8
2.2160.9
2.3191.1
2.4221.2
2.5251.4
2.6281.6
2.7311.7
2.8341.9
2.9372.1
3.0392.2
3.1422.3
3.2452.5
3.3482.7
3.4512.8
3.5543
3.6573.2
3.7593.3
3.8623.4
3.9653.6
4.0683.8
4.1713.9
4.2744.1
4.3774.3
4.4804.4
4.5824.6
4.6854.7
4.7884.9
4.8915.1
4.9945.2
5.0975.4
5.11005.6
5.21035.7
5.31055.8
5.41086
5.51116.2
5.61146.3
5.71176.5
5.81206.7
5.91236.8
6.01267
6.11287.1
6.21317.3
6.31347.4
6.41377.6
6.51407.8
6.61437.9
6.71468.1
6.81488.2
6.91518.4
7.01548.6
7.11578.7
7.21608.9
7.31639.1
7.41669.2
7.51699.4
7.61719.5
7.71749.7
7.81779.8
7.918010
8.018310.2
8.118610.3
8.218910.5
8.319210.7
8.419410.8
8.519710.9
8.620011.1
8.720311.3
8.820611.4
8.920911.6
9.021211.8
9.121411.9
9.221712.1
9.322012.2
9.422312.4
9.522612.6
9.622912.7
9.723212.9
9.823513.1
9.923713.2
10.024013.3
10.124313.5
10.224613.7
10.324913.8
10.425214
10.525514.2
10.625814.3
10.726014.4
10.826314.6
10.926614.8
11.026914.9
11.127215.1
11.227515.3
11.327815.4
11.428015.6
11.528315.7
11.628615.9
11.728916.1
11.829216.2
11.929516.4
12.029816.6
12.130116.7
12.230316.8
12.330617
12.430917.2
12.531217.3
12.631517.5
12.731817.7
12.832117.8
12.932418
13.032618.1
13.132918.3
13.233218.4
13.333518.6
13.433818.8
13.534118.9
13.634419.1
13.734619.2
13.834919.4
13.935219.6
14.035519.7
14.135819.9
14.236120.1
14.336420.2
14.436720.4
14.536920.5
14.637220.7
14.737520.8
14.837821
14.938121.2
15.038421.3
15.138721.5
15.239021.7
15.339221.8
15.439521.9
15.539822.1
15.640122.3
15.740422.4
15.840722.6
15.941022.8
16.041322.9
16.141523.1
16.241823.2
16.342123.4
16.442423.6
16.542723.7
16.643023.9
16.743324.1
16.843524.2
16.943824.3
17.044124.5
17.144424.7
17.244724.8
17.345025
17.445325.2
17.545625.3
17.645825.4
17.746125.6
17.846425.8
17.946725.9
18.047026.1
18.147326.3
18.247626.4
18.347926.6
18.448126.7
18.548426.9
18.648727.1
18.749027.2
18.849327.4
18.949627.6
19.049927.7
19.150127.8
19.250428
19.350728.2
19.451028.3
19.551328.5
19.651628.7
19.751928.8
19.852229
19.952429.1
20.052729.3

Notes on rounding

  • mg/dL values are rounded to the nearest whole number.
  • mmol/L values are rounded to one decimal place.
  • If you want a precise value for a specific A1C, use the formula above (or the calculator linked below).

Sources

Disclaimer

This page is for educational purposes only and is not medical advice. A1C and eAG are tools that help describe average glucose, but they don’t replace individualized guidance from a clinician. If you have diabetes, prediabetes, symptoms of high/low blood sugar, or results that don’t seem to match your day-to-day readings, talk with a qualified healthcare professional.

As seen in

New York Times

Popular pages

🩸
Blood pressure lookup

Look up any blood pressure and learn if it's high, low, or normal.

🚶‍♀️
Steps to miles calculator

Convert any number of steps walked to an amount in miles.

👴
Life expectancy calculator

Look up your life expectancy based on the latest data from the Social Security Administration.

🍔
BMI calculator

BMI is a quick way to determine if you're a healthy weight, overweight, or obese.