{"id":66903,"date":"2026-10-13T10:10:46","date_gmt":"2026-10-13T07:10:46","guid":{"rendered":"https:\/\/wpcalc.com\/en\/?p=66903"},"modified":"2026-10-13T10:10:46","modified_gmt":"2026-10-13T07:10:46","slug":"enzyme-turnover-number-calculator","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/chemistry\/enzyme-turnover-number-calculator\/","title":{"rendered":"Enzyme Turnover Number Calculator"},"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\">Find kcat from Vmax and Active Enzyme Concentration<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"66903\" data-favorite-title=\"Enzyme Turnover Number\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/chemistry\/enzyme-turnover-number-calculator\/\" data-favorite-excerpt=\"Calculate the enzyme turnover number (kcat) from Vmax and the total active enzyme concentration [E]t. Enter your rate in any common unit and get kcat in s\u207b\u00b9, min\u207b\u00b9 or h\u207b\u00b9.\" aria-label=\"Add to Favorites\" data-favorite-icon=\"icon icon-biology\">\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\/chemistry\/enzyme-turnover-number-calculator\/\" method=\"POST\" class=\"calculator\" id=\"calculator-66903\" data-post=\"66903\"><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\">Maximum Reaction Rate (Vmax)<\/label><div class=\"term\">Vmax<\/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=\"maximum_reaction_rate_vmax\" id=\"field-1\" aria-describedby=\"calc-info-1\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 50\" min=\"0\" value=\"50\"\/><div class=\"grid grid-cols-1\"><select id=\"field-2\" name=\"unit\" aria-label=\"Unit\"><option value=\"umol_L_min\" selected>\u00b5mol\/(L\u00b7min)<\/option><option value=\"umol_L_s\">\u00b5mol\/(L\u00b7s)<\/option><option value=\"mmol_L_min\">mmol\/(L\u00b7min)<\/option><option value=\"nmol_L_s\">nmol\/(L\u00b7s)<\/option><option value=\"nmol_L_min\">nmol\/(L\u00b7min)<\/option><option value=\"mol_L_s\">mol\/(L\u00b7s)<\/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\">Rate measured at saturating substrate concentration, in concentration per time (e.g. \u00b5mol\/L\u00b7min from a Michaelis\u2013Menten fit).<\/small><\/div><div class=\"field has-term\" id=\"input-2\"><label for=\"field-3\">Total Active Enzyme Concentration ([E]t)<\/label><div class=\"term\">[E]t<\/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=\"total_active_enzyme_concentration_et\" id=\"field-3\" aria-describedby=\"calc-info-3\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 0.1\" min=\"0\" value=\"0.1\"\/><div class=\"grid grid-cols-1\"><select id=\"field-4\" name=\"unit\" aria-label=\"Unit\"><option value=\"umol_L\" selected>\u00b5mol\/L (\u00b5M)<\/option><option value=\"nmol_L\">nmol\/L (nM)<\/option><option value=\"mmol_L\">mmol\/L (mM)<\/option><option value=\"mol_L\">mol\/L (M)<\/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-3\">Molar concentration of active enzyme sites actually present in the assay. Use \u00b5M\u2013nM values typical for kinetic experiments.<\/small><\/div><div class=\"field is-single\" id=\"input-3\"><label for=\"field-5\">Show kcat per<\/label><div class=\"grid grid-cols-1\"><select id=\"field-5\" name=\"show_kcat_per\"><option value=\"s\" selected>per second (s\u207b\u00b9)<\/option><option value=\"min\">per minute (min\u207b\u00b9)<\/option><option value=\"h\">per hour (h\u207b\u00b9)<\/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><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Re-Calculate\" id=\"calculate-button\" data-post=\"66903\">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> Turnover Number Results<\/h3><div class=\"result-box\"><div class=\"field-result\" id=\"output-1\"><span class=\"field-title\"><span>Turnover Number (kcat)<\/span><span class=\"result-term\">kcat<\/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>kcat in Other Time Units<\/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 class=\"field-result is-column\" id=\"output-3\"><span class=\"field-title\"><span>Calculation Details<\/span><\/span><span class=\"field-value\" id=\"result-3\"><\/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-4\"><span class=\"field-title\"><span>About the Turnover Number<\/span><\/span><span class=\"field-value\" id=\"result-4\"><\/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=\"66903\" 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>Enzyme Turnover Number 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\\[ k_{cat} = \\frac{V_{max}}{[E]_t} \\]<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Where:<\/strong><\/p>\n<ul>\n<li>\\(k_{cat}\\) \u2014 turnover number, or catalytic constant (s\u207b\u00b9)<\/li>\n<li>\\(V_{max}\\) \u2014 maximum reaction rate reached at saturating substrate concentration (concentration per time, e.g. \u00b5mol\/(L\u00b7s))<\/li>\n<li>\\([E]_t\\) \u2014 total concentration of active enzyme sites (e.g. \u00b5mol\/L)<\/li>\n<\/ul>\n<p>The formula follows directly from the Michaelis\u2013Menten equation: at saturating substrate (\\([S] \\gg K_m\\)), every active site is working, so the observed maximum rate equals the number of active sites multiplied by the rate of a single site. Dividing \\(V_{max}\\) by \\([E]_t\\) isolates that single-site rate, and the concentration units cancel, leaving a first-order rate constant.<\/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>Enzyme Turnover Number \u2013 Calculation Example<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Example:<\/strong> an assay with a saturating substrate gives a Michaelis\u2013Menten fit with \\(V_{max} = 50\\) \u00b5mol\/(L\u00b7min), and the cuvette contains \\([E]_t = 0.1\\) \u00b5M (0.1 \u00b5mol\/L) of active enzyme sites.<\/p>\n<p>\\[ V_{max} = 50\\ \\tfrac{\\mu mol}{L \\cdot min} \\times \\frac{1\\ min}{60\\ s} = 0.8333\\ \\tfrac{\\mu mol}{L \\cdot s} \\]<\/p>\n<p>\\[ k_{cat} = \\frac{V_{max}}{[E]_t} = \\frac{0.8333\\ \\mu mol\/(L \\cdot s)}{0.1\\ \\mu mol\/L} \\]<\/p>\n<p><strong>Result:<\/strong> \\(k_{cat} = 8.3333\\) s\u207b\u00b9 (equivalently 500 min\u207b\u00b9 or 30,000 h\u207b\u00b9). Each active site converts on average about 8.3 substrate molecules per second.<\/p>\n<p>\n\r\n<\/section>\n<h2>How to Use the Calculator<\/h2>\n<ol>\n<li>Enter the <strong>Maximum Reaction Rate (Vmax)<\/strong> obtained from your kinetic data \u2014 ideally from a Michaelis\u2013Menten or Lineweaver\u2013Burk fit measured at saturating substrate concentration.<\/li>\n<li>Select the unit of Vmax from the dropdown, e.g. \u00b5mol\/(L\u00b7min) or mol\/(L\u00b7s). All common rate units are supported.<\/li>\n<li>Enter the <strong>Total Active Enzyme Concentration ([E]t)<\/strong> \u2014 the molar concentration of active sites actually present in the assay, not the total protein concentration.<\/li>\n<li>Choose its unit (\u00b5M, nM, mM or M).<\/li>\n<li>Pick whether to <strong>Show kcat per<\/strong> second, minute or hour. The per-second form (s\u207b\u00b9) is the standard in biochemistry.<\/li>\n<li>Read the turnover number together with the equivalent values in all time units, the step-by-step calculation details, and a short interpretation of the result.<\/li>\n<\/ol>\n<h2>What Is the Enzyme Turnover Number?<\/h2>\n<p>The turnover number \\(k_{cat}\\), also called the catalytic constant, tells you how many substrate molecules a single active site of an enzyme converts to product per unit time when the enzyme is saturated with substrate. It is the upper limit of the enzyme's catalytic rate: no matter how much substrate you add, one active site cannot work faster than \\(k_{cat}\\). Numerically, it is the reciprocal of the time one complete catalytic cycle takes \u2014 a \\(k_{cat}\\) of 8.3 s\u207b\u00b9 means each cycle takes roughly 0.12 seconds.<\/p>\n<p>Because \\(k_{cat}\\) is normalized per active site, it allows fair comparisons between enzymes and between experiments, independent of how much enzyme was used. Typical values span an enormous range: very slow enzymes such as lysozyme work at about 0.5 s\u207b\u00b9, ordinary metabolic enzymes fall around 10\u00b2\u201310\u2074 s\u207b\u00b9, and near-perfect catalysts such as catalase and carbonic anhydrase reach ~10\u2076 s\u207b\u00b9.<\/p>\n<p>When interpreting your result, remember that \\(k_{cat}\\) alone describes only the saturated limit. Enzymes are usually compared by their <em>catalytic efficiency<\/em> \\(k_{cat}\/K_m\\), which also accounts for substrate affinity. Values of \\(k_{cat}\/K_m\\) approaching 10\u2078\u201310\u2079 M\u207b\u00b9s\u207b\u00b9 indicate that the enzyme is limited by how fast substrate can diffuse to it \u2014 the practical definition of a \"perfect\" enzyme. To get there, you also need \\(K_m\\), which you can obtain with the <a href=\"https:\/\/wpcalc.com\/en\/chemistry\/michaelis-menten-calculator\/\">Michaelis\u2013Menten calculator<\/a>.<\/p>\n<h2>Assumptions and Practical Tips<\/h2>\n<ul>\n<li><strong>Vmax must come from saturating conditions.<\/strong> The identity \\(V_{max} = k_{cat}[E]_t\\) holds only when \\([S] \\gg K_m\\). If the rate was measured at a lower substrate concentration, the calculated \\(k_{cat}\\) will be underestimated.<\/li>\n<li><strong>Use active-site concentration, not protein concentration.<\/strong> If the enzyme preparation contains inactive protein, or if you know the concentration of enzyme molecules rather than sites, adjust for the number of active sites per molecule (n): the correct input is \\([E]_t = n \\times\\) the molar concentration of enzyme molecules.<\/li>\n<li><strong>One-substrate Michaelis\u2013Menten scheme assumed.<\/strong> For bisubstrate reactions, allosteric enzymes, or enzymes with substrate inhibition, the simple \\(V_{max}\/[E]_t\\) ratio may not reflect the true microscopic catalytic rate.<\/li>\n<li><strong>Watch the units.<\/strong> Vmax is a rate per volume (concentration per time), while \\([E]_t\\) is a concentration. The calculator converts both to consistent units automatically so that they cancel and leave s\u207b\u00b9.<\/li>\n<li><strong>A sanity check:<\/strong> a \\(k_{cat}\\) above ~10\u2077 s\u207b\u00b9 or below 10\u207b\u00b3 s\u207b\u00b9 is rare in nature. Extreme results usually point to a unit error (e.g. entering mM as \u00b5M) or an overestimated \\(V_{max}\\).<\/li>\n<\/ul>\n<p>If you are still building your kinetic dataset, the <a href=\"https:\/\/wpcalc.com\/en\/chemistry\/reaction-order-from-initial-rates-calculator\/\">reaction order from initial rates calculator<\/a> and the <a href=\"https:\/\/wpcalc.com\/en\/chemistry\/reaction-rate-law-calculator\/\">reaction rate law calculator<\/a> can help you verify that your assay follows the expected rate law before you trust the derived \\(k_{cat}\\).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Calculate the enzyme turnover number (kcat) from Vmax and the total active enzyme concentration [E]t. Enter your rate in any common unit and get kcat in s\u207b\u00b9, min\u207b\u00b9 or h\u207b\u00b9.<\/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":[54],"tags":[60],"class_list":["post-66903","post","type-post","status-publish","format-standard","hentry","category-chemistry","tag-biochemistry"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66903","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=66903"}],"version-history":[{"count":1,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66903\/revisions"}],"predecessor-version":[{"id":66904,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66903\/revisions\/66904"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=66903"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=66903"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=66903"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}