{"id":66764,"date":"2026-10-13T08:57:03","date_gmt":"2026-10-13T05:57:03","guid":{"rendered":"https:\/\/wpcalc.com\/en\/?p=66764"},"modified":"2026-10-13T08:57:03","modified_gmt":"2026-10-13T05:57:03","slug":"alcohol-proof-converter","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/converters\/alcohol-proof-converter\/","title":{"rendered":"Alcohol Proof Converter"},"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 Between Proof and Alcohol by Volume<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"66764\" data-favorite-title=\"Alcohol Proof\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/converters\/alcohol-proof-converter\/\" data-favorite-excerpt=\"Convert between alcohol by volume (ABV), US proof and UK proof instantly. Enter any strength value and see all three equivalent units plus a context for how strong that drink is.\" 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\/alcohol-proof-converter\/\" method=\"POST\" class=\"calculator\" id=\"calculator-66764\" data-post=\"66764\"><fieldset class=\"fieldset-input is-1\"><legend class=\"sr-only\">Input Fields<\/legend><div class=\"field\" id=\"input-1\"><label for=\"field-1\">I have a value in<\/label><div class=\"grid grid-cols-1\"><select id=\"field-1\" name=\"i_have_a_value_in\"><option value=\"abv\" selected>Alcohol by volume (%)<\/option><option value=\"proof_us\">US proof<\/option><option value=\"proof_uk\">UK proof<\/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><div class=\"field has-term\" id=\"input-2\"><label for=\"field-2\">Value to convert<\/label><div class=\"term\">V<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"value_to_convert\" id=\"field-2\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 40\" min=\"0\" max=\"200\" value=\"40\"\/><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Re-Calculate\" id=\"calculate-button\" data-post=\"66764\">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 Alcohol Strength Equivalents<\/h3><div class=\"result-box\"><div class=\"field-result is-column\" id=\"output-1\"><span class=\"field-title\"><span>Equivalent alcohol strengths<\/span><span class=\"result-term\">ABV<\/span><\/span><span class=\"field-value\" id=\"result-1\"><\/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-2\"><span class=\"field-title\"><span>Strength context<\/span><\/span><span class=\"field-value\" id=\"result-2\"><\/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=\"66764\" 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>Alcohol Proof<\/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\\[ \\text{US proof} = 2 \\times \\text{ABV}(\\%) \\qquad \\text{UK proof} = \\text{ABV}(\\%) \\times \\frac{7}{4} \\qquad \\text{ABV}(\\%) = \\text{UK proof} \\times \\frac{4}{7} \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Where:<\/strong><\/p>\n<ul>\n<li>\\(\\text{ABV}\\) \u2014 alcohol by volume, the percentage of the total volume that is pure ethanol<\/li>\n<li>\\(\\text{US proof}\\) \u2014 the American proof scale, where pure (100%) alcohol equals 200 proof<\/li>\n<li>\\text{UK proof} \u2014 the British proof scale, where 100 proof equals approximately 57.06% ABV<\/li>\n<\/ul>\n<p>These two simple relationships let you move between the three systems in either direction. Whichever unit you start from, the calculator first converts the value to ABV and then derives the other two.<\/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>Alcohol Proof \u2013 Calculation Example<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Example:<\/strong> a bottle of vodka is labelled 40% ABV. What is its strength in US and UK proof?<\/p>\n<p>\\[ \\text{US proof} = 2 \\times 40 = 80 \\]<\/p>\n<p>\\[ \\text{UK proof} = 40 \\times \\frac{7}{4} = 70 \\]<\/p>\n<p><strong>Result:<\/strong> 40% ABV = <strong>80 US proof<\/strong> = <strong>70 UK proof<\/strong>. This is the standard bottling strength for most spirits sold in the US and Europe.<\/p>\n<p>\n\r\n<\/section>\n<h2>How to use the calculator<\/h2>\n<ol>\n<li>In the <strong>\u201cI have a value in\u201d<\/strong> dropdown, choose the unit your number is expressed in: <em>Alcohol by volume (%)<\/em>, <em>US proof<\/em> or <em>UK proof<\/em>.<\/li>\n<li>Enter your figure in the <strong>\u201cValue to convert\u201d<\/strong> field \u2014 for example 40 for a typical spirit, or 80 if you have a US proof figure.<\/li>\n<li>Read the <strong>\u201cEquivalent alcohol strengths\u201d<\/strong> table, which shows your value converted into all three units and marks the one you entered.<\/li>\n<li>Check the <strong>\u201cStrength context\u201d<\/strong> line to see what type of drink that strength corresponds to, from beer to near-pure alcohol.<\/li>\n<\/ol>\n<h2>What is alcohol proof?<\/h2>\n<p>Alcohol by volume (ABV) is the modern, international way of expressing the strength of an alcoholic drink: it is the share of the beverage's total volume that is pure ethanol. A drink at 40% ABV contains 40 ml of pure alcohol in every 100 ml of liquid. ABV is the standard on labels throughout Europe, most of Asia and Latin America, and increasingly everywhere else.<\/p>\n<p>Proof is an older measure, and it means different things depending on where you are. In the United States, proof is simply double the ABV percentage \u2014 so 80 US proof is 40% ABV, and 200 US proof would be pure alcohol. This system came from a 19th-century British tradition of \u201cproof spirit\u201d: gunpowder wet with spirit of sufficient strength would still ignite, \u201cproving\u201d the alcohol content. The modern US scale formalised the ratio at 2:1.<\/p>\n<p>The United Kingdom used a different, more complex scale, defined so that 100 UK proof equals exactly 57.06% ABV by volume. In round terms, UK proof is ABV multiplied by 7\u20444. So the same 40% ABV vodka that is 80 US proof is 70 UK proof \u2014 a reminder that proof numbers are meaningless without knowing which country's scale is being used. The UK switched to ABV for labelling in 1980, but old books, classic cocktail recipes and some historical or export bottles still quote UK proof.<\/p>\n<p>The calculator also gives you a sense of scale: below about 5% ABV you are in beer territory, 11\u201314% is typical table wine, 17\u201322% is fortified wine, 40% is the standard strength for spirits, and anything above 60% is cask-strength or overproof territory that should be handled and sipped with care.<\/p>\n<h2>Typical strengths reference table<\/h2>\n<table>\n<thead>\n<tr>\n<th>Drink<\/th>\n<th>ABV<\/th>\n<th>US proof<\/th>\n<th>UK proof<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Light beer<\/td>\n<td>4%<\/td>\n<td>8<\/td>\n<td>7<\/td>\n<\/tr>\n<tr>\n<td>Table wine<\/td>\n<td>12%<\/td>\n<td>24<\/td>\n<td>21<\/td>\n<\/tr>\n<tr>\n<td>Port \/ sherry<\/td>\n<td>20%<\/td>\n<td>40<\/td>\n<td>35<\/td>\n<\/tr>\n<tr>\n<td>Vodka \/ gin \/ whisky<\/td>\n<td>40%<\/td>\n<td>80<\/td>\n<td>70<\/td>\n<\/tr>\n<tr>\n<td>Cask-strength whisky<\/td>\n<td>60%<\/td>\n<td>120<\/td>\n<td>105<\/td>\n<\/tr>\n<tr>\n<td>Overproof rum<\/td>\n<td>75.5%<\/td>\n<td>151<\/td>\n<td>132.1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Assumptions and limitations<\/h2>\n<ul>\n<li><strong>US proof is exact:<\/strong> the relation US proof = 2 \u00d7 ABV is a legal definition, so those conversions carry no rounding error beyond the decimals shown.<\/li>\n<li><strong>UK proof is approximate in practice:<\/strong> the historical scale was defined by density rather than volume fraction. The calculator uses the standard 7:4 ratio (100 UK proof = 57.06% ABV), which matches how the scale is almost always quoted today.<\/li>\n<li><strong>ABV is capped at 100%:<\/strong> pure ethanol is 200 US proof or about 175.1 UK proof. Ordinary distillation cannot exceed roughly 95.6% ABV because ethanol and water form an azeotrope, so no real beverage reaches the top of the scale.<\/li>\n<li><strong>Proof is not a measure of \u201chow drunk\u201d:<\/strong> it describes concentration, not the total alcohol you consume. A large glass of wine can contain more alcohol than a shot of spirits.<\/li>\n<li><strong>Label values are nominal:<\/strong> legal tolerances allow a small deviation between the stated and actual ABV, and some wines change slightly after bottling.<\/li>\n<\/ul>\n<h2>Related calculators<\/h2>\n<p>If you are working with homemade drinks, our <a href=\"https:\/\/wpcalc.com\/en\/converters\/brewing-abv-calculator\/\">Brewing ABV calculator<\/a> estimates the final alcohol content from gravity readings, and the <a href=\"https:\/\/wpcalc.com\/en\/converters\/brix-to-specific-gravity-converter\/\">Brix to specific gravity converter<\/a> helps with the sugar measurements behind fermentation. For other everyday unit conversions, try the <a href=\"https:\/\/wpcalc.com\/en\/converters\/ppm-to-percent-mg-l-converter\/\">PPM converter<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Convert between alcohol by volume (ABV), US proof and UK proof instantly. Enter any strength value and see all three equivalent units plus a context for how strong that drink is.<\/p>\n","protected":false},"author":3168,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[3],"tags":[31],"class_list":["post-66764","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\/66764","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=66764"}],"version-history":[{"count":1,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66764\/revisions"}],"predecessor-version":[{"id":66765,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66764\/revisions\/66765"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=66764"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=66764"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=66764"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}