{"id":12,"date":"2026-05-07T14:50:11","date_gmt":"2026-05-07T14:50:11","guid":{"rendered":"https:\/\/blackholecalculator.com\/?page_id=12"},"modified":"2026-05-07T17:24:35","modified_gmt":"2026-05-07T17:24:35","slug":"home","status":"publish","type":"page","link":"https:\/\/blackholecalculator.com\/","title":{"rendered":"Schwarzschild Radius Calculator"},"content":{"rendered":"\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<style>\n   .rs-card{\n        font-family:Arial,sans-serif;\n        background:#151a2e;\n        color:#fff;\n        padding:24px;\n        border-radius:12px;\n        box-shadow:0 10px 30px rgba(0,0,0,.4)\n      }\n      .rs-card h3{margin:0 0 16px;font-size:18px}\n      .rs-card input,.rs-card select,.rs-card button{\n        width:100%;padding:10px;margin-bottom:12px;\n        border-radius:6px;border:none;box-sizing:border-box;\n      }\n      .rs-card button{\n        background:#4f7cff;color:#fff;cursor:pointer\n      }\n      .rs-result{font-size:14px;line-height:1.5}\n    <\/style>\n\n    <div class=\"rs-card\">\n      <h3>Schwarzschild Radius Calculator<\/h3>\n      <input id=\"rs-mass\" type=\"number\" placeholder=\"Mass value\">\n      <select id=\"rs-unit\">\n        <option value=\"kg\">Kilograms<\/option>\n        <option value=\"earth\">Earth masses<\/option>\n        <option value=\"sun\">Solar masses<\/option>\n      <\/select>\n      <button id=\"rs-btn\">Calculate<\/button>\n      <div class=\"rs-result\" id=\"rs-result\"><\/div>\n    <\/div>\n  <\/div>\n\n  <script>\n    document.addEventListener('DOMContentLoaded', function () {\n      const G = 6.67430e-11;\n      const c = 299792458;\n      const ME = 5.972e24;\n      const MS = 1.989e30;\n\n      const btn = document.getElementById('rs-btn');\n\n      btn.addEventListener('click', function () {\n        const v = parseFloat(document.getElementById('rs-mass').value);\n        const u = document.getElementById('rs-unit').value;\n        const result = document.getElementById('rs-result');\n\n        if (!v || v <= 0) {\n          result.innerHTML = 'Please enter a valid value.';\n          return;\n        }\n\n        let m = v;\n        if (u === 'earth') m = v * ME;\n        if (u === 'sun') m = v * MS;\n\n        const rs = (2 * G * m) \/ (c * c);\n\n        let cmp = 'Comparable to a small planet.';\n        if (rs < 1e-15) cmp = 'Smaller than an atomic nucleus.';\n        else if (rs < 1e-12) cmp = 'Comparable to a proton.';\n        else if (rs < 1e-9) cmp = 'Smaller than a virus.';\n        else if (rs < 1e-6) cmp = 'Smaller than a bacterium.';\n        else if (rs < 0.001) cmp = 'Comparable to a grain of sand.';\n        else if (rs < 0.01) cmp = 'About the width of a human hair.';\n        else if (rs < 0.1) cmp = 'Comparable to a raindrop.';\n        else if (rs < 1) cmp = 'Smaller than a coin.';\n        else if (rs < 10) cmp = 'About the size of a human.';\n        else if (rs < 100) cmp = 'Comparable to a house.';\n        else if (rs < 1000) cmp = 'About the size of a building.';\n        else if (rs < 1000000) cmp = 'Comparable to a mountain.';\n        else if (rs < 700000000) cmp = 'Comparable to a star.';\n\n        result.innerHTML =\n          'Schwarzschild radius: <strong>' + rs.toExponential(3) +\n          ' \u043c<\/strong><br><em>' + cmp + '<\/em>';\n      });\n    });\n  <\/script>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-center\">What Is Your Schwarzschild Radius?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The Schwarzschild radius is the critical radius at which an object\u2019s gravity becomes so strong that not even light can escape. So, if any mass is compressed within this radius, it would form a <strong>black hole<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This calculator lets you explore that concept by entering the mass of any object \u2014 from planets and stars, to hypothetical supermassive bodies or smaller objects like Your favourite car, smartphone and &#8230; yes \u2014 <strong>even Yourself<\/strong>. You can instantly calculate the Schwarzschild radius of everything.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The formula is based on Einstein\u2019s theory of general relativity:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Rs = 2GM \/ c\u00b2<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">where:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>G<\/strong> is the gravitational constant<\/li>\n\n\n\n<li><strong>M<\/strong> is the object\u2019s mass<\/li>\n\n\n\n<li><strong>c<\/strong> is the speed of light<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For comparison:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Earth\u2019s Schwarzschild radius is only about <strong>9 millimeters<\/strong><\/li>\n\n\n\n<li>The Sun\u2019s is roughly <strong>3 kilometers<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">So have fun and use the calculator to see how gravity scales across the universe \u2014 from microscopic black holes to supermassive cosmic objects.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Schwarzschild Radius Calculator KilogramsEarth massesSolar masses Calculate What Is Your Schwarzschild Radius? The Schwarzschild radius is the critical radius at [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-12","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/blackholecalculator.com\/index.php?rest_route=\/wp\/v2\/pages\/12","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blackholecalculator.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/blackholecalculator.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/blackholecalculator.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blackholecalculator.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=12"}],"version-history":[{"count":15,"href":"https:\/\/blackholecalculator.com\/index.php?rest_route=\/wp\/v2\/pages\/12\/revisions"}],"predecessor-version":[{"id":30,"href":"https:\/\/blackholecalculator.com\/index.php?rest_route=\/wp\/v2\/pages\/12\/revisions\/30"}],"wp:attachment":[{"href":"https:\/\/blackholecalculator.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=12"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}