{"id":55928,"date":"2015-10-24T15:52:54","date_gmt":"2015-10-24T13:52:54","guid":{"rendered":"http:\/\/wpcalc.com\/?p=55928"},"modified":"2026-09-28T09:34:47","modified_gmt":"2026-09-28T06:34:47","slug":"reaumur","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/converters\/reaumur\/","title":{"rendered":"Reaumur to Celsius, Fahrenheit &#038; More 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\">Reaumur Temperature Conversion Tool<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"55928\" data-favorite-title=\"Reaumur to Celsius, Fahrenheit &amp; More\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/converters\/reaumur\/\" data-favorite-excerpt=\"Enter a temperature in degrees Reaumur to convert it to Celsius, Fahrenheit, Kelvin, Rankine, Newton, Delisle, and R\u00f8mer.\" aria-label=\"Add to Favorites\" data-favorite-icon=\"icon icon-chemistry\">\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\/reaumur\/\" method=\"POST\" class=\"calculator\" id=\"calculator-55928\" data-post=\"55928\"><fieldset class=\"fieldset-input is-1\"><legend class=\"sr-only\">Input Fields<\/legend><div class=\"field has-term\" id=\"input-1\"><label for=\"field-1\">Temperature in Reaumur<\/label><div class=\"term\">\u00b0Re<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"number\" name=\"temperature_in_reaumur\" id=\"field-1\" aria-describedby=\"calc-unit-1 calc-info-1\" step=\"0.1\" value=\"20\"\/><div class=\"unit\" id=\"calc-unit-1\">\u00b0Re<\/div><small id=\"calc-info-1\">Enter the temperature in degrees Reaumur<\/small><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Re-Calculate\" id=\"calculate-button\" data-post=\"55928\">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 Results<\/h3><div class=\"result-box\"><div class=\"field-result\" id=\"output-1\"><span class=\"field-title\"><span>Celsius<\/span><\/span><span class=\"field-value\" id=\"result-1\" data-unit=\"\u00b0C\"><\/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>Fahrenheit<\/span><\/span><span class=\"field-value\" id=\"result-2\" data-unit=\"\u00b0F\"><\/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>Kelvin<\/span><\/span><span class=\"field-value\" id=\"result-3\" data-unit=\"K\"><\/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>Rankine<\/span><\/span><span class=\"field-value\" id=\"result-4\" data-unit=\"\u00b0R\"><\/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-5\"><span class=\"field-title\"><span>Newton<\/span><\/span><span class=\"field-value\" id=\"result-5\" data-unit=\"\u00b0N\"><\/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-6\"><span class=\"field-title\"><span>Delisle<\/span><\/span><span class=\"field-value\" id=\"result-6\" data-unit=\"\u00b0De\"><\/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-7\"><span class=\"field-title\"><span>R\u00f8mer<\/span><\/span><span class=\"field-value\" id=\"result-7\" data-unit=\"\u00b0R\u00f8\"><\/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=\"55928\" 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>Reaumur to Celsius, Fahrenheit &amp; More 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\\begin{aligned}\nC &amp;= 1.25r \\\\\nF &amp;= 1.8C+32 \\\\\nK &amp;= C+273.15 \\\\\nR &amp;= 1.8C+491.67 \\\\\nN &amp;= \\frac{C}{3.03030303} \\\\\nD &amp;= 1.5(100-C) \\\\\nR_{\\mathrm{o}} &amp;= \\frac{C}{1.9047619}+7.5\n\\end{aligned}\n\\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Where:<\/strong><\/p>\n<ul>\n<li>\\(r\\) \u2014 input temperature in degrees Reaumur (\u00b0Re).<\/li>\n<li>\\(C\\), \\(F\\), and \\(K\\) \u2014 temperatures in Celsius (\u00b0C), Fahrenheit (\u00b0F), and kelvin (K).<\/li>\n<li>\\(R\\), \\(N\\), \\(D\\), and \\(R_{\\mathrm{o}}\\) \u2014 temperatures in Rankine (\u00b0R), Newton (\u00b0N), Delisle (\u00b0De), and R\u00f8mer (\u00b0R\u00f8).<\/li>\n<\/ul>\n<p>First convert Reaumur to Celsius, then use the Celsius value to calculate the other scales. The Newton and R\u00f8mer divisors shown match the calculator\u2019s formulas; their small decimal approximations have a negligible effect on typical results.<\/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>Reaumur to Celsius, Fahrenheit &amp; More \u2013 Calculation Example<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Example:<\/strong> Convert the default input of 20 \u00b0Re to all seven output scales.<\/p>\n<p>First, calculate Celsius:<\/p>\n<p>\\[C=20\\times1.25=25\\ ^\\circ\\mathrm{C}\\]<\/p>\n<p>Then use 25 \u00b0C in the remaining formulas:<\/p>\n<p>\\[\\begin{aligned}F&amp;=25\\times1.8+32=77\\ ^\\circ\\mathrm{F}\\\\K&amp;=25+273.15=298.15\\ \\mathrm{K}\\\\R&amp;=25\\times1.8+491.67=536.67\\ ^\\circ\\mathrm{R}\\\\N&amp;\\approx25\\div3.03030303=8.25\\ ^\\circ\\mathrm{N}\\\\D&amp;=(100-25)\\times1.5=112.5\\ ^\\circ\\mathrm{De}\\\\R_{\\mathrm{o}}&amp;\\approx25\\div1.9047619+7.5=20.625\\ ^\\circ\\mathrm{R\\o}\\end{aligned}\\]<\/p>\n<p><strong>Result:<\/strong> 20 \u00b0Re is 25 \u00b0C, 77 \u00b0F, 298.15 K, 536.67 \u00b0R, approximately 8.25 \u00b0N, 112.5 \u00b0De, and 20.625 \u00b0R\u00f8. The calculator may round displayed values.<\/p>\n<p>\n\r\n<\/section>\n<h2>How to use the calculator<\/h2>\n<ol>\n<li>Find the field labeled <strong>Temperature in Reaumur<\/strong>. It starts at 20 \u00b0Re.<\/li>\n<li>Enter the value you want to convert. You can use a decimal or a negative number; for example, enter 12.5 for 12.5 \u00b0Re.<\/li>\n<li>Read the seven results labeled <strong>Celsius<\/strong>, <strong>Fahrenheit<\/strong>, <strong>Kelvin<\/strong>, <strong>Rankine<\/strong>, <strong>Newton<\/strong>, <strong>Delisle<\/strong>, and <strong>R\u00f8mer<\/strong>. Each result represents the same temperature on a different scale.<\/li>\n<\/ol>\n<h2>What is the Reaumur temperature scale?<\/h2>\n<p>The Reaumur scale is a historical temperature scale found in some European records, scientific writing, and traditional recipes. On this scale, water freezes at 0 \u00b0Re and boils at 80 \u00b0Re under standard atmospheric pressure. Those same reference points are 0 \u00b0C and 100 \u00b0C, so each Reaumur degree corresponds to 1.25 Celsius degrees.<\/p>\n<p>That relationship makes Celsius the starting point for every result in this converter. For example, 20 \u00b0Re becomes 25 \u00b0C, a temperature that can then be expressed as 77 \u00b0F. The numbers differ because each scale uses its own degree size, zero point, or both; the physical temperature does not change.<\/p>\n<p>The other outputs can help when comparing sources that use less familiar units. Kelvin and Rankine are absolute temperature scales: their zero is absolute zero, and their units are written K and \u00b0R, respectively. Newton, Delisle, and R\u00f8mer are historical scales. Delisle runs in the opposite direction from Celsius: its reading falls as temperature rises.<\/p>\n<h2>Reference points and practical notes<\/h2>\n<table>\n<thead>\n<tr>\n<th>Reference point<\/th>\n<th>Reaumur<\/th>\n<th>Celsius<\/th>\n<th>Fahrenheit<\/th>\n<th>Kelvin<\/th>\n<th>Delisle<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Water freezes<\/td>\n<td>0 \u00b0Re<\/td>\n<td>0 \u00b0C<\/td>\n<td>32 \u00b0F<\/td>\n<td>273.15 K<\/td>\n<td>150 \u00b0De<\/td>\n<\/tr>\n<tr>\n<td>Default example<\/td>\n<td>20 \u00b0Re<\/td>\n<td>25 \u00b0C<\/td>\n<td>77 \u00b0F<\/td>\n<td>298.15 K<\/td>\n<td>112.5 \u00b0De<\/td>\n<\/tr>\n<tr>\n<td>Water boils at standard atmospheric pressure<\/td>\n<td>80 \u00b0Re<\/td>\n<td>100 \u00b0C<\/td>\n<td>212 \u00b0F<\/td>\n<td>373.15 K<\/td>\n<td>0 \u00b0De<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>These are conversions between temperature readings, not temperature differences. For a change of 1 \u00b0Re, the change is 1.25 \u00b0C or 2.25 \u00b0F; the offsets of 32 \u00b0F and 273.15 K do not apply to a temperature change. If you are interpreting an old recipe or instrument reading, also consider whether the source specifies a measurement method or reference conditions.<\/p>\n<p>Water\u2019s boiling temperature varies with atmospheric pressure, so the boiling-point row is a scale reference rather than a promise that water always boils at those readings. The calculator applies its equations to any entered number; values below \u2212218.52 \u00b0Re would produce a negative kelvin result and are not physically valid temperatures.<\/p>\n<p>To start with a different unit, use the <a href=\"https:\/\/wpcalc.com\/en\/converters\/celsius\/\">Celsius converter<\/a>, <a href=\"https:\/\/wpcalc.com\/en\/converters\/fahrenheit\/\">Fahrenheit converter<\/a>, or <a href=\"https:\/\/wpcalc.com\/en\/converters\/kelvin\/\">Kelvin converter<\/a>. For another historical scale, see the <a href=\"https:\/\/wpcalc.com\/en\/converters\/delisle\/\">Delisle converter<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Enter a temperature in degrees Reaumur to convert it to Celsius, Fahrenheit, Kelvin, Rankine, Newton, Delisle, and R\u00f8mer.<\/p>\n","protected":false},"author":70,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[3],"tags":[17],"class_list":["post-55928","post","type-post","status-publish","format-standard","hentry","category-converters","tag-chemistry-units"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/55928","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\/70"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/comments?post=55928"}],"version-history":[{"count":2,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/55928\/revisions"}],"predecessor-version":[{"id":65309,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/55928\/revisions\/65309"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=55928"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=55928"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=55928"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}