{"id":66738,"date":"2026-10-13T08:51:59","date_gmt":"2026-10-13T05:51:59","guid":{"rendered":"https:\/\/wpcalc.com\/en\/?p=66738"},"modified":"2026-10-23T17:04:38","modified_gmt":"2026-10-23T14:04:38","slug":"hba1c-converter","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/converters\/hba1c-converter\/","title":{"rendered":"A1C Calculator \u2013 HbA1c to Average Blood Sugar (eAG)"},"content":{"rendered":"<section class=\"not-prose calculator-box\" aria-labelledby=\"calculator-title\"><div class=\"flex items-baseline sm:items-center justify-between gap-2 sm:gap-3\"><div class=\"flex flex-col sm:flex-row sm:items-center gap-2\"><span class=\"icon icon-calculator text-primary-700! text-base! dark:text-primary-300!\" aria-hidden=\"true\"><\/span><h2 id=\"calculator-title\" class=\"text-lg font-display font-bold\">Convert HbA1c Between % and mmol\/mol<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"66738\" data-favorite-title=\"HbA1c\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/converters\/hba1c-converter\/\" data-favorite-excerpt=\"Convert HbA1c between percent (DCCT) and mmol\/mol (IFCC) units, and see the estimated average glucose (eAG) it represents. Enter your lab result and choose its unit.\" aria-label=\"Add to Favorites\" data-favorite-icon=\"icon icon-other\">\n    <span class=\"icon icon-shape-star-empty\" aria-hidden=\"true\"><\/span>\n  <\/button>\n  <div class=\"calcdash-favorite__tip\" aria-hidden=\"true\">\n   <span class=\"favorite-tooltip\" id=\"favorite-tooltip\"><\/span>\n  <\/div>\n  <span class=\"sr-only\" role=\"status\" id=\"favorite-status\"><\/span>\n<\/div><\/div><form action=\"https:\/\/wpcalc.com\/en\/converters\/hba1c-converter\/\" method=\"POST\" class=\"calculator\" id=\"calculator-66738\" data-post=\"66738\"><fieldset class=\"fieldset-input is-2\"><legend class=\"sr-only\">Input Fields<\/legend><div class=\"field has-term\" id=\"input-1\"><label for=\"field-1\">HbA1c value<\/label><div class=\"term\">HbA1c<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"hba1c_value\" id=\"field-1\" aria-describedby=\"calc-info-1\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"3\" max=\"25\" value=\"7.5\"\/><div class=\"grid grid-cols-1\"><select id=\"field-2\" name=\"unit\" aria-label=\"Unit\"><option value=\"percent\" selected>%<\/option><option value=\"mmol\">mmol\/mol<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-1\">Enter your lab result in either unit<\/small><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Re-Calculate\" id=\"calculate-button\" data-post=\"66738\">Calculate<\/button><button type=\"reset\">Reset<\/button><\/div><div class=\"field is-checkbox hidden!\" id=\"field-auto-calc\"><input type=\"checkbox\" id=\"auto-calc\"><label for=\"auto-calc\">Calculate automatically<\/label><small>If enabled, the result will update automatically when you change any value.<\/small><\/div><div class=\"fieldset-result is-hidden\" aria-labelledby=\"result-title\" aria-live=\"polite\" role=\"region\"> <h3 class=\"result-title bg-gradient-to-r from-primary-50 to-gray-50 dark:from-primary-900 dark:to-gray-800\" id=\"result-title\"><span class=\"icon icon-s-pulse\" aria-hidden=\"true\"><\/span> Your HbA1c Conversion<\/h3><div class=\"result-box\"><div class=\"field-result\" id=\"output-1\"><span class=\"field-title\"><span>HbA1c (DCCT units)<\/span><span class=\"result-term\">%<\/span><\/span><span class=\"field-value\" id=\"result-1\" data-unit=\"%\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-2\"><span class=\"field-title\"><span>HbA1c (IFCC units)<\/span><span class=\"result-term\">mmol\/mol<\/span><\/span><span class=\"field-value\" id=\"result-2\" data-unit=\"mmol\/mol\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-3\"><span class=\"field-title\"><span>Estimated average glucose<\/span><span class=\"result-term\">eAG<\/span><\/span><span class=\"field-value\" id=\"result-3\" data-unit=\"mg\/dL\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-4\"><span class=\"field-title\"><span>Estimated average glucose<\/span><span class=\"result-term\">eAG<\/span><\/span><span class=\"field-value\" id=\"result-4\" data-unit=\"mmol\/L\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-5\"><span class=\"field-title\"><span>What this means<\/span><\/span><span class=\"field-value\" id=\"result-5\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><\/div><div class=\"result-actions\"><button type=\"button\" class=\"copy-link\"><svg viewBox=\"0 0 20 20\" fill=\"currentColor\" aria-hidden=\"true\"><path d=\"M12.232 4.232a2.5 2.5 0 0 1 3.536 3.536l-1.225 1.224a.75.75 0 0 0 1.061 1.06l1.224-1.224a4 4 0 0 0-5.656-5.656l-3 3a4 4 0 0 0 .225 5.865.75.75 0 0 0 .977-1.138 2.5 2.5 0 0 1-.142-3.667l3-3Z\"\/><path d=\"M11.603 7.963a.75.75 0 0 0-.977 1.138 2.5 2.5 0 0 1 .142 3.667l-3 3a2.5 2.5 0 0 1-3.536-3.536l1.225-1.224a.75.75 0 0 0-1.061-1.06l-1.224 1.224a4 4 0 1 0 5.656 5.656l3-3a4 4 0 0 0-.225-5.865Z\"\/><\/svg><span class=\"copy-link__text\">Copy link to this calculation<\/span><\/button><span class=\"sr-only\" role=\"status\" id=\"copy-link-status\"><\/span><\/div><\/div><a href=\"#respond\" class=\"hidden transition-opacity duration-300 opacity-0 w-50 text-sm justify-center items-center gap-2 px-4 py-2 rounded bg-gray-200 text-gray-700 hover:bg-gray-300\" id=\"leave-comment\"><span class=\"icon icon-comments\" aria-hidden=\"true\"><\/span>Leave a Comment<\/a><\/form><\/section><section id=\"calc-reactions\" class=\"not-prose hidden my-12 bg-gradient-to-r from-primary-50 to-gray-50 border border-indigo-100 rounded-xl px-6 py-4 shadow-sm\" data-post=\"66738\" aria-live=\"polite\" aria-labelledby=\"calc-reactions-title\"><p id=\"calc-reactions-title\" class=\"text-sm text-gray-500 text-center mb-2\">How did this result make you feel?<\/p><div role=\"group\" aria-labelledby=\"calc-reactions-title\" class=\"grid grid-cols-3 sm:flex sm:flex-row sm:justify-around gap-4 sm:items-center sm:flex-wrap\"><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"like\"><span class=\"reaction-count\" data-reaction-count=\"like\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude00 <\/span><span class=\"reaction-description font-medium\">Like <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"helpful\"><span class=\"reaction-count\" data-reaction-count=\"helpful\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\udca1 <\/span><span class=\"reaction-description font-medium\">Helpful <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"confused\"><span class=\"reaction-count\" data-reaction-count=\"confused\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude15 <\/span><span class=\"reaction-description font-medium\">Confused <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"disappointed\"><span class=\"reaction-count\" data-reaction-count=\"disappointed\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude1e <\/span><span class=\"reaction-description font-medium\">Disappointed <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"inaccurate\"><span class=\"reaction-count\" data-reaction-count=\"inaccurate\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\u274c <\/span><span class=\"reaction-description font-medium\">Inaccurate <\/span><\/button><\/div><div id=\"reaction-message\" class=\"hidden mt-8 rounded-md border border-primary-100 bg-white\/50 backdrop-blur-sm px-4 py-2 text-sm text-center shadow-sm\"><\/div><\/section><div class=\"calcdash-ad not-prose calcdash-ad--calc_result calcdash-ad--in-article\"><ins class=\"adsbygoogle\" style=\"display:block\" data-ad-client=\"ca-pub-1721569815777345\" data-ad-slot=\"6317458308\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\"><\/ins><script>(adsbygoogle = window.adsbygoogle || []).push({});<\/script><\/div>\n<style id=\"wpcoderpro-inline-1\">.formula-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section class=\"formula-box\" aria-labelledby=\"formula-title\">\r\n\t<div id=\"formula-title\" class=\"not-prose font-display mb-4\"><span class=\"icon icon-formula\" aria-hidden=\"true\"><\/span><h2>HbA1c Formula<\/h2><\/div>\r\n\t<figure class=\"not-prose formula\">\r\n\t\t<figcaption class=\"formula-title\">Formula<\/figcaption>\r\n\t\t<div class=\"text-base text-gray-800\" id=\"formula\">\n\\[\n\\text{HbA1c (mmol\/mol)} = \\left( \\text{HbA1c (\\%)} - 2.15 \\right) \\times 10.929 \\\\\n\\text{HbA1c (\\%)} = \\frac{\\text{HbA1c (mmol\/mol)}}{10.929} + 2.15 \\\\\n\\text{eAG (mg\/dL)} = 28.7 \\times \\text{HbA1c (\\%)} - 46.7 \\\\\n\\text{eAG (mmol\/L)} = \\frac{\\text{eAG (mg\/dL)}}{18}\n\\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Where:<\/strong><\/p>\n<ul>\n<li>\\(\\text{HbA1c (\\%)}\\) \u2014 glycated hemoglobin in DCCT percentage units<\/li>\n<li>\\(\\text{HbA1c (mmol\/mol)}\\) \u2014 glycated hemoglobin in IFCC units<\/li>\n<li>\\(\\text{eAG}\\) \u2014 estimated average glucose over the previous 2\u20133 months<\/li>\n<\/ul>\n<p>The first two equations are the IFCC\/DCCT \"master equation\" used to translate between the two reporting systems. The eAG equations come from the ADAG study and estimate the average blood glucose that corresponds to a given HbA1c.<\/p>\n<p>\r\n<\/section>\n<style id=\"wpcoderpro-inline-459\">.calculation-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section id=\"calculation\" class=\"calculation-box\" aria-labelledby=\"calculation-title\">\r\n\t<div id=\"calculation-title\" class=\"not-prose font-display\"><span class=\"icon icon-unordered-list\" aria-hidden=\"true\"><\/span><h2>HbA1c \u2013 Calculation Example<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Example:<\/strong> a lab report shows an HbA1c of 7.5%, and you want the IFCC value and the corresponding average glucose.<\/p>\n<p>\\[<br \/>\n\\text{mmol\/mol} = (7.5 - 2.15) \\times 10.929 = 5.35 \\times 10.929 \\approx 58<br \/>\n\\]<\/p>\n<p>\\[<br \/>\n\\text{eAG} = 28.7 \\times 7.5 - 46.7 = 215.25 - 46.7 \\approx 169 \\text{ mg\/dL}<br \/>\n\\]<\/p>\n<p>\\[<br \/>\n\\text{eAG} = \\frac{168.55}{18} \\approx 9.4 \\text{ mmol\/L}<br \/>\n\\]<\/p>\n<p><strong>Result:<\/strong> an HbA1c of 7.5% equals 58 mmol\/mol, corresponding to an estimated average glucose of about 169 mg\/dL (9.4 mmol\/L).<\/p>\n<p>\n\r\n<\/section>\n<h2>How to Use the HbA1c Calculator<\/h2>\n<ol>\n<li>Enter your lab result in the <strong>HbA1c value<\/strong> field.<\/li>\n<li>Select the unit your lab used \u2014 <strong>%<\/strong> (DCCT, common in the US) or <strong>mmol\/mol<\/strong> (IFCC, used in Europe, the UK, Canada, Australia and many other countries) \u2014 in the <strong>Unit<\/strong> dropdown next to the value.<\/li>\n<li>Read your HbA1c expressed in both unit systems, plus the estimated average glucose in mg\/dL and mmol\/L.<\/li>\n<li>Check the <strong>What this means<\/strong> section for the general interpretation of your result.<\/li>\n<\/ol>\n<h2>What Is HbA1c and Why Are There Two Units?<\/h2>\n<p>HbA1c, or glycated hemoglobin, measures the percentage of hemoglobin in your red blood cells that has glucose attached to it. Because red blood cells live for roughly three months, HbA1c reflects your average blood sugar over the past 2\u20133 months \u2014 it is not affected by a single meal or a fast on the day of the test. This makes it the standard test for monitoring diabetes and one of the main tests for diagnosing it.<\/p>\n<p>Two reporting systems coexist. The United States reports HbA1c as a percentage (DCCT units), for example 7.5%. Most of the rest of the world reports it in mmol\/mol (IFCC units), for example 58 mmol\/mol, which is a true concentration unit. The two scales are related by the IFCC\/DCCT master equation shown above, so any value can be converted exactly in either direction \u2014 6.5% is exactly 48 mmol\/mol.<\/p>\n<p>Alongside the conversion, the calculator shows the estimated average glucose (eAG). This translates your HbA1c into the everyday glucose numbers a meter would show, which many people find easier to relate to: an HbA1c of 7% corresponds to an eAG of about 154 mg\/dL (8.6 mmol\/L). Keep in mind that eAG is a statistical estimate derived from the ADAG study, not a measurement of your personal glucose \u2014 individuals can differ from the average.<\/p>\n<h2>Interpreting the Result<\/h2>\n<p>According to the American Diabetes Association diagnostic criteria for adults without diabetes:<\/p>\n<ul>\n<li><strong>Below 5.7% (below 39 mmol\/mol)<\/strong> \u2014 normal range.<\/li>\n<li><strong>5.7\u20136.4% (39\u201346 mmol\/mol)<\/strong> \u2014 prediabetes range; lifestyle changes can reduce the risk of progressing to type 2 diabetes.<\/li>\n<li><strong>6.5% (48 mmol\/mol) or higher<\/strong> \u2014 diabetes range (a diagnosis always requires confirmation by a health professional).<\/li>\n<\/ul>\n<p>For people who already have diabetes, targets are individual. The ADA often suggests aiming for below 7% (53 mmol\/mol), but your doctor may recommend a tighter or looser target depending on your age, treatment, hypoglycemia risk and other conditions.<\/p>\n<h2>Assumptions and Limitations<\/h2>\n<ul>\n<li>The % \u2194 mmol\/mol conversion is exact per the IFCC\/DCCT master equation; the eAG is an estimate and can deviate from your true average by a meaningful margin.<\/li>\n<li>Conditions that change red blood cell turnover \u2014 anemia, recent blood loss or transfusion, pregnancy, hemoglobin variants, kidney disease \u2014 can make HbA1c inaccurate regardless of units.<\/li>\n<li>The interpretation thresholds apply to adults without diabetes; diagnostic thresholds differ for children and during pregnancy.<\/li>\n<li>This calculator is for information only and does not replace medical advice or a diagnosis from your healthcare provider.<\/li>\n<\/ul>\n<h2>Quick Reference Table<\/h2>\n<table>\n<thead>\n<tr>\n<th>HbA1c (%)<\/th>\n<th>HbA1c (mmol\/mol)<\/th>\n<th>eAG (mg\/dL)<\/th>\n<th>eAG (mmol\/L)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>5.0<\/td>\n<td>31<\/td>\n<td>97<\/td>\n<td>5.4<\/td>\n<\/tr>\n<tr>\n<td>5.7<\/td>\n<td>39<\/td>\n<td>117<\/td>\n<td>6.5<\/td>\n<\/tr>\n<tr>\n<td>6.0<\/td>\n<td>42<\/td>\n<td>126<\/td>\n<td>7.0<\/td>\n<\/tr>\n<tr>\n<td>6.5<\/td>\n<td>48<\/td>\n<td>140<\/td>\n<td>7.8<\/td>\n<\/tr>\n<tr>\n<td>7.0<\/td>\n<td>53<\/td>\n<td>154<\/td>\n<td>8.6<\/td>\n<\/tr>\n<tr>\n<td>7.5<\/td>\n<td>58<\/td>\n<td>169<\/td>\n<td>9.4<\/td>\n<\/tr>\n<tr>\n<td>8.0<\/td>\n<td>64<\/td>\n<td>183<\/td>\n<td>10.2<\/td>\n<\/tr>\n<tr>\n<td>9.0<\/td>\n<td>75<\/td>\n<td>212<\/td>\n<td>11.8<\/td>\n<\/tr>\n<tr>\n<td>10.0<\/td>\n<td>86<\/td>\n<td>240<\/td>\n<td>13.3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>If you also work with day-to-day glucose readings, try our <a href=\"https:\/\/wpcalc.com\/en\/converters\/blood-sugar-units-converter-mg-dl-to-mmol-l\/\">blood sugar converter<\/a> for mg\/dL and mmol\/L values, or the <a href=\"https:\/\/wpcalc.com\/en\/converters\/cholesterol-units-converter-mg-dl-to-mmol-l\/\">cholesterol unit converter<\/a> for lipid panels, which are often reported in different units around the world.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Convert HbA1c between percent (DCCT) and mmol\/mol (IFCC) units, and see the estimated average glucose (eAG) it represents. Enter your lab result and choose its unit.<\/p>\n","protected":false},"author":3168,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[3],"tags":[31],"class_list":["post-66738","post","type-post","status-publish","format-standard","hentry","category-converters","tag-other-units"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66738","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/users\/3168"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/comments?post=66738"}],"version-history":[{"count":2,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66738\/revisions"}],"predecessor-version":[{"id":67507,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66738\/revisions\/67507"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=66738"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=66738"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=66738"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}