{"id":66464,"date":"2026-10-06T17:17:41","date_gmt":"2026-10-06T14:17:41","guid":{"rendered":"https:\/\/wpcalc.com\/en\/?p=66464"},"modified":"2026-10-06T17:17:41","modified_gmt":"2026-10-06T14:17:41","slug":"ph-calculator","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/chemistry\/ph-calculator\/","title":{"rendered":"pH 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 pH and pOH from Ion Concentration<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"66464\" data-favorite-title=\"pH\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/chemistry\/ph-calculator\/\" data-favorite-excerpt=\"Calculate the pH and pOH of a solution from its hydrogen ion (H\u207a) or hydroxide ion (OH\u207b) concentration. Enter the molar concentration and an optional temperature to get pH, pOH and pKw.\" aria-label=\"Add to Favorites\" data-favorite-icon=\"icon icon-chemistry-1\">\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\/ph-calculator\/\" method=\"POST\" class=\"calculator\" id=\"calculator-66464\" data-post=\"66464\"><fieldset class=\"fieldset-input is-1\"><legend class=\"sr-only\">Input Fields<\/legend><div class=\"field\" id=\"input-1\"><label for=\"field-1\">Known Ion<\/label><div class=\"grid grid-cols-1\"><select id=\"field-1\" name=\"known_ion\"><option value=\"h\" selected>Hydrogen ion (H\u207a \/ H\u2083O\u207a)<\/option><option value=\"oh\">Hydroxide ion (OH\u207b)<\/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\">Ion Concentration<\/label><div class=\"term\">[H\u207a] \/ [OH\u207b]<\/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=\"ion_concentration\" id=\"field-2\" aria-describedby=\"calc-info-2\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 0.0001\" min=\"0\" value=\"0.0001\"\/><div class=\"grid grid-cols-1\"><select id=\"field-3\" name=\"unit\" aria-label=\"Unit\"><option value=\"mol\" selected>mol\/L<\/option><option value=\"mmol\">mmol\/L<\/option><option value=\"umol\">\u00b5mol\/L<\/option><option value=\"nmol\">nmol\/L<\/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-2\">Molar concentration of the selected ion<\/small><\/div><div class=\"field has-term\" id=\"input-3\"><label for=\"field-4\">Temperature (optional)<\/label><div class=\"term\">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=\"temperature_optional\" id=\"field-4\" aria-describedby=\"calc-info-4\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 25\" min=\"0\" max=\"100\" value=\"25\"\/><div class=\"grid grid-cols-1\"><select id=\"field-5\" name=\"unit\" aria-label=\"Unit\"><option value=\"c\" selected>\u00b0C<\/option><option value=\"f\">\u00b0F<\/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-4\">Used for the ion product of water pKw; 25 \u00b0C gives pKw \u2248 14.00. Left empty, 25 \u00b0C is assumed<\/small><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Re-Calculate\" id=\"calculate-button\" data-post=\"66464\">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>pH<\/span><span class=\"result-term\">pH<\/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\" id=\"output-2\"><span class=\"field-title\"><span>pOH<\/span><span class=\"result-term\">pOH<\/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\" id=\"output-3\"><span class=\"field-title\"><span>pKw at This Temperature<\/span><span class=\"result-term\">pKw<\/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>Solution Is<\/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=\"66464\" 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>pH 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\\[ \\mathrm{pH} = -\\log_{10}[\\mathrm{H^+}] \\qquad \\mathrm{pOH} = -\\log_{10}[\\mathrm{OH^-}] \\qquad \\mathrm{pH} + \\mathrm{pOH} = \\mathrm{p}K_w \\\\]\n\\[ \\mathrm{p}K_w = 14.94 - 0.04209\\,T + 0.0001711\\,T^2 \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Where:<\/strong><\/p>\n<ul>\n<li>\\([\\mathrm{H^+}]\\) \u2014 hydrogen (hydronium) ion concentration in mol\/L<\/li>\n<li>\\([\\mathrm{OH^-}]\\) \u2014 hydroxide ion concentration in mol\/L<\/li>\n<li>\\(\\mathrm{p}K_w\\) \u2014 ion product constant of water \\((-\\log_{10}K_w)\\)<\/li>\n<li>\\(T\\) \u2014 temperature in \u00b0C<\/li>\n<\/ul>\n<p>The pH is the negative base-10 logarithm of the hydrogen ion concentration. Because \\(\\mathrm{pH} + \\mathrm{pOH} = \\mathrm{p}K_w\\), knowing either ion concentration and the temperature fixes both values.<\/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>pH \u2013 Calculation Example<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Example:<\/strong> a solution has a hydrogen ion concentration of \\(0.0001\\) mol\/L (\\(10^{-4}\\) mol\/L) at 25 \u00b0C.<\/p>\n<p>\\[ \\mathrm{pH} = -\\log_{10}(10^{-4}) = 4.000 \\]<\/p>\n<p>\\[ \\mathrm{p}K_w = 14.94 - 0.04209 \\times 25 + 0.0001711 \\times 25^2 \\approx 13.995 \\]<\/p>\n<p>\\[ \\mathrm{pOH} = 13.995 - 4.000 = 9.995 \\]<\/p>\n<p><strong>Result:<\/strong> pH = 4.000, pOH = 9.995, pKw \u2248 13.995. The solution is <strong>acidic<\/strong> (pH &lt; 7).<\/p>\n<p>\n\r\n<\/section>\n<h2>How to Use the pH Calculator<\/h2>\n<ol>\n<li>In the <strong>Known Ion<\/strong> dropdown, select whether you measured the hydrogen ion (H\u207a \/ H\u2083O\u207a) or the hydroxide ion (OH\u207b).<\/li>\n<li>Enter the <strong>Ion Concentration<\/strong> value, e.g. 0.0001.<\/li>\n<li>Pick the matching <strong>Unit<\/strong> (mol\/L, mmol\/L, \u00b5mol\/L or nmol\/L) \u2014 the calculator converts it to mol\/L automatically.<\/li>\n<li>Optionally set the <strong>Temperature<\/strong> and its unit (\u00b0C or \u00b0F). If left empty, 25 \u00b0C is assumed, giving pKw \u2248 14.00.<\/li>\n<li>Read the results: <strong>pH<\/strong>, <strong>pOH<\/strong>, <strong>pKw at This Temperature<\/strong>, and whether the solution is acidic, basic or neutral.<\/li>\n<\/ol>\n<h2>What Is pH and What Does the Result Mean?<\/h2>\n<p>pH measures how acidic or basic (alkaline) an aqueous solution is. It is defined as the negative logarithm of the hydrogen ion activity; for dilute solutions, the concentration \\([\\mathrm{H^+}]\\) is an excellent approximation. Because the scale is logarithmic, each whole pH unit represents a tenfold change in acidity: a solution of pH 3 has ten times more H\u207a ions than one of pH 4, and a hundred times more than pH 5.<\/p>\n<p>The pOH is the mirror image of pH: it expresses the hydroxide ion concentration the same way. The two are linked through the ion product of water, \\(K_w = [\\mathrm{H^+}][\\mathrm{OH^-}]\\), so \\(\\mathrm{pH} + \\mathrm{pOH} = \\mathrm{p}K_w\\). At 25 \u00b0C, \\(\\mathrm{p}K_w \\approx 14\\), which is why pH 7 is called neutral at room temperature: \\([\\mathrm{H^+}] = [\\mathrm{OH^-}] = 10^{-7}\\) mol\/L.<\/p>\n<p>Interpreting the result: pH below 7 means the solution is acidic, pH above 7 means it is basic, and pH exactly 7 means neutral \u2014 but only at that temperature. The pKw of water changes with temperature (about 14.94 at 0 \u00b0C, 13.26 at 60 \u00b0C), so pure water is neutral at pH \u2248 6.14 near 100 \u00b0C, not pH 7. That is why the calculator asks for temperature and reports the pKw it used.<\/p>\n<h2>Assumptions, Limitations and Practical Tips<\/h2>\n<ul>\n<li><strong>Concentration vs. activity:<\/strong> the calculator uses molar concentrations. In concentrated solutions (above roughly 0.1 mol\/L of dissolved salts), ionic interactions make the true pH differ from the value computed here; a pH meter measures activity directly.<\/li>\n<li><strong>Temperature model:<\/strong> the empirical pKw formula is accurate from 0 to 60 \u00b0C and still reasonable up to 100 \u00b0C. Values above 60 \u00b0C are approximate.<\/li>\n<li><strong>Strong vs. weak electrolytes:<\/strong> entering an analytical (total) concentration assumes the ion is fully dissociated. For weak acids and bases, or for buffered mixtures, first determine the equilibrium concentration \u2014 our <a href=\"https:\/\/wpcalc.com\/en\/chemistry\/acetate-buffer-2\/\">Acetate Buffer Composition<\/a> calculator can help with buffer systems.<\/li>\n<li><strong>Unit shortcuts:<\/strong> 0.0001 mol\/L can be entered as 100 \u00b5mol\/L or 0.1 mmol\/L \u2014 pick whichever unit you have and the conversion is handled for you.<\/li>\n<li><strong>Dilution problems:<\/strong> if your concentration comes from diluting a stock solution, use the <a href=\"https:\/\/wpcalc.com\/en\/chemistry\/c1v1-c2v2\/\">C1V1 = C2V2 dilution calculator<\/a> first, then feed the result here.<\/li>\n<li><strong>Spectrophotometry:<\/strong> if you determine concentrations from absorbance measurements, the <a href=\"https:\/\/wpcalc.com\/en\/chemistry\/beer-lambert-law\/\">Beer\u2013Lambert Law calculator<\/a> pairs well with this tool.<\/li>\n<\/ul>\n<h2>Quick Reference: pH of Common Substances<\/h2>\n<table>\n<thead>\n<tr>\n<th>Substance<\/th>\n<th>Approximate pH<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Gastric acid<\/td>\n<td>1\u20132<\/td>\n<\/tr>\n<tr>\n<td>Lemon juice<\/td>\n<td>2\u20133<\/td>\n<\/tr>\n<tr>\n<td>Black coffee<\/td>\n<td>5<\/td>\n<\/tr>\n<tr>\n<td>Pure water (25 \u00b0C)<\/td>\n<td>7<\/td>\n<\/tr>\n<tr>\n<td>Seawater<\/td>\n<td>8<\/td>\n<\/tr>\n<tr>\n<td>Baking soda solution<\/td>\n<td>9<\/td>\n<\/tr>\n<tr>\n<td>Household ammonia<\/td>\n<td>11\u201312<\/td>\n<\/tr>\n<tr>\n<td>Drain cleaner (NaOH)<\/td>\n<td>13\u201314<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>These are typical ranges at room temperature; actual values depend on concentration and purity.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Calculate the pH and pOH of a solution from its hydrogen ion (H\u207a) or hydroxide ion (OH\u207b) concentration. Enter the molar concentration and an optional temperature to get pH, pOH and pKw.<\/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":[57],"class_list":["post-66464","post","type-post","status-publish","format-standard","hentry","category-chemistry","tag-reactions"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66464","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=66464"}],"version-history":[{"count":1,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66464\/revisions"}],"predecessor-version":[{"id":66465,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66464\/revisions\/66465"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=66464"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=66464"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=66464"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}