{"id":66955,"date":"2026-10-13T10:40:04","date_gmt":"2026-10-13T07:40:04","guid":{"rendered":"https:\/\/wpcalc.com\/en\/?p=66955"},"modified":"2026-10-13T10:40:04","modified_gmt":"2026-10-13T07:40:04","slug":"double-slit-interference-calculator","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/physics\/double-slit-interference-calculator\/","title":{"rendered":"Double-Slit Interference 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 the Spacing and Position of Bright Fringes<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"66955\" data-favorite-title=\"Double-Slit Interference\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/physics\/double-slit-interference-calculator\/\" data-favorite-excerpt=\"Calculate the fringe spacing and the position of bright fringes in Young&#039;s double-slit experiment. Enter the wavelength, slit separation, screen distance and fringe order.\" aria-label=\"Add to Favorites\" data-favorite-icon=\"icon icon-spectrum\">\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\/physics\/double-slit-interference-calculator\/\" method=\"POST\" class=\"calculator\" id=\"calculator-66955\" data-post=\"66955\"><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\">Wavelength (\u03bb)<\/label><div class=\"term\">\u03bb<\/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=\"wavelength_\" id=\"field-1\" aria-describedby=\"calc-info-1\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 650\" min=\"0\" value=\"650\"\/><div class=\"grid grid-cols-1\"><select id=\"field-2\" name=\"unit\" aria-label=\"Unit\"><option value=\"nm\" selected>nm<\/option><option value=\"um\">\u00b5m<\/option><option value=\"mm\">mm<\/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\">Wavelength of the coherent light. Red laser \u2248 650 nm, green laser \u2248 532 nm, blue laser \u2248 450 nm.<\/small><\/div><div class=\"field has-term\" id=\"input-2\"><label for=\"field-3\">Slit separation (d)<\/label><div class=\"term\">d<\/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=\"slit_separation_d\" id=\"field-3\" aria-describedby=\"calc-info-3\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 0.25\" min=\"0\" value=\"0.25\"\/><div class=\"grid grid-cols-1\"><select id=\"field-4\" name=\"unit\" aria-label=\"Unit\"><option value=\"um\">\u00b5m<\/option><option value=\"mm\" selected>mm<\/option><option value=\"cm\">cm<\/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\">Distance between the centres of the two slits. Often a fraction of a millimetre in lab demonstrations.<\/small><\/div><div class=\"field has-term\" id=\"input-3\"><label for=\"field-5\">Screen distance (L)<\/label><div class=\"term\">L<\/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=\"screen_distance_l\" id=\"field-5\" aria-describedby=\"calc-info-5\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 1\" min=\"0\" value=\"1\"\/><div class=\"grid grid-cols-1\"><select id=\"field-6\" name=\"unit\" aria-label=\"Unit\"><option value=\"cm\">cm<\/option><option value=\"m\" selected>m<\/option><option value=\"ft\">ft<\/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-5\">Distance from the slits to the observation screen.<\/small><\/div><div class=\"field has-term\" id=\"input-4\"><label for=\"field-7\">Fringe order (m), optional<\/label><div class=\"term\">m<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"fringe_order_m_optional\" id=\"field-7\" aria-describedby=\"calc-info-7\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 3 (leave blank to skip)\" min=\"0\" value=\"3\"\/><small id=\"calc-info-7\">Optional. Order of the bright fringe: m = 0 is the central maximum, m = 1 the first bright fringe to the side, and so on. If entered, the calculator also finds the position of that fringe on the screen.<\/small><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Re-Calculate\" id=\"calculate-button\" data-post=\"66955\">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> Interference Results<\/h3><div class=\"result-box\"><div class=\"field-result is-column\" id=\"output-1\"><span class=\"field-title\"><span>Fringe spacing (distance between bright fringes)<\/span><span class=\"result-term\">\u0394y<\/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>Position of the chosen bright fringe<\/span><span class=\"result-term\">y\u2098<\/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=\"66955\" 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>Double-Slit Interference<\/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\\[ \\Delta y = \\frac{\\lambda L}{d} \\qquad y_m = m \\, \\Delta y = \\frac{m \\lambda L}{d} \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Where:<\/strong><\/p>\n<ul>\n<li>\\(\\Delta y\\) \u2014 fringe spacing, the distance between two neighbouring bright fringes on the screen (m)<\/li>\n<li>\\(y_m\\) \u2014 position of the bright fringe of order \\(m\\), measured from the centre of the pattern (m)<\/li>\n<li>\\(\\lambda\\) \u2014 wavelength of the light (m)<\/li>\n<li>\\(L\\) \u2014 distance from the slits to the screen (m)<\/li>\n<li>\\(d\\) \u2014 separation between the two slits (m)<\/li>\n<li>\\(m\\) \u2014 fringe order: \\(m = 0\\) is the central maximum, \\(m = 1, 2, 3, \\ldots\\) the side fringes<\/li>\n<\/ul>\n<p>The first formula gives the spacing of the interference pattern, and the second gives how far the \\(m\\)-th bright fringe lies from the centre. Both assume the small-angle regime (\\(\\lambda \\ll d\\)), which holds in virtually every laboratory and classroom setup.<\/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>Double-Slit Interference \u2013 Calculation Example<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Example:<\/strong> a red laser (\\(\\lambda = 650\\) nm) shines on two slits separated by \\(d = 0.25\\) mm, and the pattern is observed on a screen \\(L = 1\\) m away. Where does the third bright fringe (\\(m = 3\\)) fall?<\/p>\n<p>\\[ \\Delta y = \\frac{\\lambda L}{d} = \\frac{650 \\times 10^{-9}\\ \\text{m} \\times 1\\ \\text{m}}{0.25 \\times 10^{-3}\\ \\text{m}} = 2.6 \\times 10^{-3}\\ \\text{m} = 2.6\\ \\text{mm} \\]<\/p>\n<p>\\[ y_3 = m \\, \\Delta y = 3 \\times 2.6\\ \\text{mm} = 7.8\\ \\text{mm} \\]<\/p>\n<p><strong>Result:<\/strong> the bright fringes are 2.6 mm apart, and the third-order bright fringe lies 7.8 mm from the centre of the pattern on either side. These are exactly the calculator's default values, so you can reproduce the result above instantly.<\/p>\n<p>\n\r\n<\/section>\n<h2>How to use the calculator<\/h2>\n<ol>\n<li>Enter the <strong>Wavelength (\u03bb)<\/strong> of the light and pick its unit (nm, \u00b5m or mm). A red laser pointer is about 650 nm, a green one 532 nm.<\/li>\n<li>Enter the <strong>Slit separation (d)<\/strong> \u2014 the distance between the centres of the two slits \u2014 and choose \u00b5m, mm or cm.<\/li>\n<li>Enter the <strong>Screen distance (L)<\/strong> from the slits to where the pattern is observed, in cm, m or ft.<\/li>\n<li>Optionally enter a <strong>Fringe order (m)<\/strong> (0, 1, 2, 3 \u2026). If you leave it blank, the calculator only reports the fringe spacing.<\/li>\n<li>Read the results: the fringe spacing \\(\\Delta y\\) in several units, and \u2014 if you entered an order \u2014 the position \\(y_m\\) of that bright fringe measured from the centre of the pattern.<\/li>\n<\/ol>\n<h2>What is double-slit interference?<\/h2>\n<p>In 1801 Thomas Young sent light through two narrow, closely spaced slits and saw something a stream of particles could never produce: alternating bright and dark bands on a screen. Waves reaching the screen from the two slits travel slightly different distances. Wherever the path difference is a whole number of wavelengths \u2014 \\(d \\sin\\theta = m\\lambda\\) \u2014 the waves arrive in step and reinforce each other, producing a bright fringe. Where the path difference is an odd number of half-wavelengths, they cancel and produce a dark fringe.<\/p>\n<p>The pattern is a direct fingerprint of the light's wavelength, which is what makes the experiment so useful. Measuring the fringe spacing on a screen with a ruler gives \\(\\lambda\\) through \\(\\lambda = \\Delta y \\, d \/ L\\); this is still one of the most common ways to determine the wavelength of a laser in teaching labs. Conversely, with a known wavelength the same geometry is used to measure tiny distances \u2014 such as the spacing of tracks or thin structures \u2014 far smaller than a ruler can resolve.<\/p>\n<p>The fringe spacing \\(\\Delta y\\) tells you how \"stretched\" the pattern is: it grows linearly with the wavelength and with the screen distance, and shrinks as the slits are moved apart. The position result \\(y_m\\) is symmetric \u2014 a fringe of order \\(m\\) appears at \\(+y_m\\) on one side of the centre and at \\(-y_m\\) on the other, because both orders \\(+m\\) and \\(-m\\) satisfy the bright-fringe condition. The central maximum (\\(m = 0\\)) sits on the axis and is twice as wide as the side fringes.<\/p>\n<p>Interference is not limited to light. The same principle governs noise-cancelling headphones, the colours on a soap film, and the diffraction of water and sound waves \u2014 you can explore the wave side of sound further with our <a href=\"https:\/\/wpcalc.com\/en\/physics\/sound-intensity-level-calculator\/\">Sound Intensity Level calculator<\/a>. For a broader collection, see also the <a href=\"https:\/\/wpcalc.com\/en\/physics\/simple-pendulum-calculator\/\">Simple Pendulum calculator<\/a> and the <a href=\"https:\/\/wpcalc.com\/en\/physics\/faradays-law-calculator\/\">Faraday's Law calculator<\/a>.<\/p>\n<h2>Assumptions, limitations and practical tips<\/h2>\n<ul>\n<li><strong>Small-angle approximation:<\/strong> the formulas use \\(\\sin\\theta \\approx \\tan\\theta \\approx \\theta\\), which is excellent when \\(\\lambda \\ll d\\) and fringes stay close to the axis. For high orders near the maximum allowed order, the calculator compares the approximate position with the exact geometry and notes the difference when it exceeds 1%.<\/li>\n<li><strong>Maximum order:<\/strong> since \\(m\\lambda \\le d\\), only orders up to \\(m = \\lfloor d\/\\lambda \\rfloor\\) exist. If you request a higher order, the calculator tells you the highest possible one.<\/li>\n<li><strong>Coherent light:<\/strong> the two slits must be illuminated by the same coherent source (a laser or a single slit in front of a lamp). Two independent light sources will not produce a stable pattern.<\/li>\n<li><strong>Point slits, no diffraction envelope:<\/strong> the model treats each slit as infinitely narrow. Real slits of finite width add a diffraction envelope that modulates the fringe brightness \u2014 very high orders may be too dim to see even though the math allows them.<\/li>\n<li><strong>Accuracy tip:<\/strong> because \\(\\Delta y\\) is proportional to \\(L\\), measuring the screen distance carefully matters. Pushing the screen further away spreads the pattern out and makes the fringe spacing easier to measure precisely.<\/li>\n<li><strong>Wavelength must be smaller than the slit separation:<\/strong> if \\(\\lambda \\ge d\\) the first bright fringe would need an angle of 90\u00b0 or more, and no distinct pattern forms; the calculator flags this input as invalid.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Calculate the fringe spacing and the position of bright fringes in Young's double-slit experiment. Enter the wavelength, slit separation, screen distance and fringe order.<\/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":[62],"tags":[87],"class_list":["post-66955","post","type-post","status-publish","format-standard","hentry","category-physics","tag-waves-optics"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66955","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=66955"}],"version-history":[{"count":1,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66955\/revisions"}],"predecessor-version":[{"id":66956,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66955\/revisions\/66956"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=66955"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=66955"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=66955"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}