A1C Calculator

Convert between A1C and average blood sugar levels with color-coded diabetes risk ranges, reference charts, and bidirectional conversion. Free, fast, and private — runs entirely in your browser.

Share Y

Save your results

AI Analysis PRO

AI analysis detected patterns in your calculation. Personalized insights and recommendations available with Pro...

Unlock AI Insights — Free 7-Day Trial

Download PDF Report

Get detailed breakdowns, charts, and shareable PDF reports with Pro

PRO

Share your result

Share Y

Estimate Mortgage Generate Passwords Format JSON

Rate this tool

Analyze ingredient safety with AI

Check 10,000+ ingredients for safety — Pro starts at $9/mo

Learn more

Want more? Unlock the full experience

Pro members get the most out of A1C Calculator

PDF Reports

Download detailed reports with charts and breakdowns

AI Analysis

Get personalized insights and recommendations

Unlimited Access

No daily limits on any tool or calculator

Try Pro Free for 7 DaysThen $9.00/mo · Cancel anytime

Shop Glucose Monitors

Top-rated blood glucose monitors and test strips.

Shop Now

Compare Health Insurance Plans

Find affordable coverage for diabetes management.

Compare Plans

Sponsored · We may earn a commission at no cost to you

How to Use A1C Calculator

1Enter your A1C percentage or average blood sugar.
2View the converted value instantly.
3Check the color-coded risk range (normal, prediabetes, diabetes).
4Reference the A1C-to-glucose conversion table.

Frequently Asked Questions

A1C (HbA1c) measures your average blood sugar over the past 2-3 months. It's used to diagnose and monitor diabetes. Normal is below 5.7%.

Using the formula: eAG (mg/dL) = 28.7 × A1C − 46.7. This gives the estimated average glucose corresponding to your A1C level.

Yes, completely free with no sign-up required. All calculations run in your browser.

No, this is for educational purposes only. Always consult your healthcare provider for diabetes diagnosis and management.

Using the A1C Calculator is simple: visit the tool page, enter your data or input into the provided fields, and get instant results. No downloads, installations, or sign-ups are required. The tool runs directly in your web browser for maximum convenience.

Yes, the A1C Calculator is fully responsive and works perfectly on smartphones, tablets, and desktop computers. Simply open NexTool in your mobile browser and navigate to the tool — no app download required.

Get weekly tips for A1C Calculator & more

No spam. Unsubscribe anytime.

About A1C Calculator

Convert between A1C and average blood sugar levels with color-coded diabetes risk ranges, reference charts, and bidirectional conversion. Free, fast, and private — runs entirely in your browser.

NexTool's A1C Calculator is completely free to use with no sign-up required. Your data is processed directly in your browser and never sent to our servers, ensuring complete privacy and instant results.

Embed This Tool

Add A1C Calculator to your website. Paste the code below into your HTML. The iframe auto-resizes to fit the tool content.

Width

Height

px or %

<iframe src="https://getnextool.com/embed/a1c-calculator" width="100%" height="600" frameborder="0" style="border:0;border-radius:12px;" loading="lazy" title="A1C Calculator - NexTool"></iframe>
<script>window.addEventListener('message',function(e){if(e.data&&e.data.type==='nextool-embed-resize'){var iframes=document.querySelectorAll('iframe[src*="getnextool.com/embed/"]');iframes.forEach(function(f){if(e.source===f.contentWindow)f.style.height=e.data.height+'px'})}});</script>

Open embed in new tab

Related Tools

BMI Calculator

Calculate your Body Mass Index with visual BMI scale

Calorie Calculator

Calculate daily calories (TDEE/BMR) with macro breakdowns for your goals

Pregnancy Due Date Calculator

Calculate pregnancy due date, trimester timeline, and development milestones

Running Pace Calculator

Calculate running pace, finish time, or distance with split times

Body Fat Calculator

Estimate body fat percentage using the US Navy method and BMI formula

BAC Calculator

Estimate blood alcohol content based on drinks, weight, and time

Get Free Financial Guides

Weekly tips, new calculator alerts, and exclusive lifetime deal offers.

No spam, ever Unsubscribe anytime Free guides included

A1C Calculator

Convert between A1C and average blood sugar levels with color-coded diabetes risk ranges, reference charts, and bidirectional conversion. Free, fast, and private — runs entirely in your browser.

Share Y

Convert From

A1C Percentage (%)

3%14%

Estimated Average Glucose (eAG)

140 mg/dL

(7.8 mmol/L)

Diabetes

Your blood sugar is in the diabetes range. Consult your healthcare provider for management options.

3%Normal <5.7%Pre 5.7-6.4%Diabetes ≥6.5%14%

A1C

6.5%

eAG (mg/dL)

140

eAG (mmol/L)

7.8

3-Month Blood Sugar Trend Interpretation

Your A1C of 6.5% reflects your average blood sugar over the past 2-3 months. This means your blood sugar has been averaging around 140 mg/dL (7.8 mmol/L) during this period.

What This Means

A1C measures glycated hemoglobin, reflecting average glucose over red blood cell lifespan (~120 days)
More recent weeks contribute more heavily to the A1C value than earlier weeks
Individual readings can vary significantly from this average throughout the day

Factors That Can Affect Accuracy

Anemia or hemoglobin variants may skew results
Recent blood transfusions can affect readings
Kidney disease and liver disease may cause inaccuracies
Pregnancy can affect A1C interpretation

A1C Target Ranges

Most adults with diabetes

Target: Below 7.0%

Within Target

Older adults / complex conditions

Target: Below 8.0%

Within Target

Pregnancy (GDM)

Target: Below 6.0%

+0.5% above

Non-diabetic (healthy)

Target: Below 5.7%

+0.8% above

A1C to Blood Sugar Reference Table

A1C (%)	eAG (mg/dL)	eAG (mmol/L)	Classification
4.0%	68	3.8	Normal
4.5%	82	4.6	Normal
5.0%	97	5.4	Normal
5.5%	111	6.2	Normal
5.7%	117	6.5	Prediabetes
6.0%	126	7.0	Prediabetes
6.5%You	140	7.8	Diabetes
7.0%	154	8.6	Diabetes
7.5%	169	9.4	Diabetes
8.0%	183	10.2	Diabetes
8.5%	197	10.9	Diabetes
9.0%	212	11.8	Diabetes
9.5%	226	12.6	Diabetes
10.0%	240	13.4	Diabetes
10.5%	255	14.2	Diabetes
11.0%	269	14.9	Diabetes
11.5%	283	15.7	Diabetes
12.0%	298	16.5	Diabetes

Conversion Formula

A1C to Blood Sugar

eAG (mg/dL) = 28.7 x A1C - 46.7

Example: 28.7 x 6.5 - 46.7 = 139.8 mg/dL

Blood Sugar to A1C

A1C = (eAG + 46.7) / 28.7

Example: (140 + 46.7) / 28.7 = 6.5%

Based on the ADAG (A1C-Derived Average Glucose) study published in Diabetes Care. This formula is endorsed by the American Diabetes Association and used internationally.

mg/dL and mmol/L Conversion

mg/dL to mmol/L

Divide by 18.0182

mmol/L to mg/dL

Multiply by 18.0182

mg/dL is used primarily in the US. mmol/L is the international standard used in most other countries.

Medical Disclaimer

This calculator provides estimates based on the ADAG study formula. Individual results may vary. The eAG is an approximation and does not replace regular blood glucose monitoring. Always consult your healthcare provider for medical advice, diagnosis, and treatment decisions. Do not make changes to your medication or treatment based solely on this calculator.

Save your results

AI Analysis PRO

AI analysis detected patterns in your calculation. Personalized insights and recommendations available with Pro...

Unlock AI Insights — Free 7-Day Trial

Download PDF Report

Get detailed breakdowns, charts, and shareable PDF reports with Pro

PRO

Share your result

Share Y

Estimate Mortgage Generate Passwords Format JSON

Rate this tool

Analyze ingredient safety with AI

Check 10,000+ ingredients for safety — Pro starts at $9/mo

Learn more

Want more? Unlock the full experience

Pro members get the most out of A1C Calculator

PDF Reports

Download detailed reports with charts and breakdowns

AI Analysis

Get personalized insights and recommendations

Unlimited Access

No daily limits on any tool or calculator

Try Pro Free for 7 DaysThen $9.00/mo · Cancel anytime

Shop Glucose Monitors

Top-rated blood glucose monitors and test strips.

Shop Now

Compare Health Insurance Plans

Find affordable coverage for diabetes management.

Compare Plans

Sponsored · We may earn a commission at no cost to you

How to Use A1C Calculator

1Enter your A1C percentage or average blood sugar.
2View the converted value instantly.
3Check the color-coded risk range (normal, prediabetes, diabetes).
4Reference the A1C-to-glucose conversion table.

Frequently Asked Questions

A1C (HbA1c) measures your average blood sugar over the past 2-3 months. It's used to diagnose and monitor diabetes. Normal is below 5.7%.

Using the formula: eAG (mg/dL) = 28.7 × A1C − 46.7. This gives the estimated average glucose corresponding to your A1C level.

Yes, completely free with no sign-up required. All calculations run in your browser.

No, this is for educational purposes only. Always consult your healthcare provider for diabetes diagnosis and management.

Get weekly tips for A1C Calculator & more

No spam. Unsubscribe anytime.

About A1C Calculator

Convert between A1C and average blood sugar levels with color-coded diabetes risk ranges, reference charts, and bidirectional conversion. Free, fast, and private — runs entirely in your browser.

Embed This Tool

Add A1C Calculator to your website. Paste the code below into your HTML. The iframe auto-resizes to fit the tool content.

Width

Height

px or %

<iframe src="https://getnextool.com/embed/a1c-calculator" width="100%" height="600" frameborder="0" style="border:0;border-radius:12px;" loading="lazy" title="A1C Calculator - NexTool"></iframe>
<script>window.addEventListener('message',function(e){if(e.data&&e.data.type==='nextool-embed-resize'){var iframes=document.querySelectorAll('iframe[src*="getnextool.com/embed/"]');iframes.forEach(function(f){if(e.source===f.contentWindow)f.style.height=e.data.height+'px'})}});</script>

Open embed in new tab

Related Tools

BMI Calculator

Calculate your Body Mass Index with visual BMI scale

Calorie Calculator

Calculate daily calories (TDEE/BMR) with macro breakdowns for your goals

Pregnancy Due Date Calculator

Calculate pregnancy due date, trimester timeline, and development milestones

Running Pace Calculator

Calculate running pace, finish time, or distance with split times

Body Fat Calculator

Estimate body fat percentage using the US Navy method and BMI formula

BAC Calculator

Estimate blood alcohol content based on drinks, weight, and time

Get Free Financial Guides

Weekly tips, new calculator alerts, and exclusive lifetime deal offers.

No spam, ever Unsubscribe anytime Free guides included

A1C (%)

eAG (mg/dL)

eAG (mmol/L)

Classification

4.0%

3.8

Normal

4.5%

4.6

Normal

5.0%

5.4

Normal

5.5%

111

6.2

Normal

5.7%

117

6.5

Prediabetes

6.0%

126

7.0

Prediabetes

6.5%You

140

7.8

Diabetes

7.0%

154

8.6

Diabetes

7.5%

169

9.4

Diabetes

8.0%

183

10.2

Diabetes

8.5%

197

10.9

Diabetes

9.0%

212

11.8

Diabetes

9.5%

226

12.6

Diabetes

10.0%

240

13.4

Diabetes

10.5%

255

14.2

Diabetes

11.0%

269

14.9

Diabetes

11.5%

283

15.7

Diabetes

12.0%

298

16.5

Diabetes