{"id":1445,"date":"2026-03-04T11:43:45","date_gmt":"2026-03-04T11:43:45","guid":{"rendered":"https:\/\/powerbuilding.pl\/check-body-fat-percentage-bf-and-muscle-mass-online-calculator\/"},"modified":"2026-03-07T13:41:11","modified_gmt":"2026-03-07T13:41:11","slug":"check-body-fat-percentage-bf-and-muscle-mass-online-calculator","status":"publish","type":"post","link":"https:\/\/powerbuilding.pl\/en\/check-body-fat-percentage-bf-and-muscle-mass-online-calculator\/","title":{"rendered":"Check Body Fat Percentage (BF%) and Muscle Mass &#8211; Online Calculator"},"content":{"rendered":"\n<div id=\"bf-calculator\" style=\"max-width: 400px; margin: 20px auto; padding: 25px; border: 1px solid #e0e0e0; border-radius: 12px; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background-color: #f9f9f9; box-shadow: 0 4px 6px rgba(0,0,0,0.1);\">\n    <h3 style=\"text-align: center; color: #333; margin-top: 0;\">Body Fat Percentage Calculator<\/h3>\n    \n    <label style=\"display: block; margin-bottom: 5px; font-weight: 600;\">Gender:<\/label>\n    <select id=\"gender\" style=\"width: 100%; padding: 10px; margin-bottom: 15px; border-radius: 5px; border: 1px solid #ccc;\" onchange=\"toggleHip()\">\n        <option value=\"male\">Male<\/option>\n <option value=\"female\">Female<\/option>\n    <\/select>\n\n    <label style=\"display: block; margin-bottom: 5px; font-weight: 600;\">Weight (kg):<\/label>\n    <input type=\"number\" id=\"weight\" style=\"width: 100%; padding: 10px; margin-bottom: 15px; border-radius: 5px; border: 1px solid #ccc;\" placeholder=\"e.g., 80\"\/>\n\n    <label style=\"display: block; margin-bottom: 5px; font-weight: 600;\">Height (cm):<\/label>\n    <input type=\"number\" id=\"height\" style=\"width: 100%; padding: 10px; margin-bottom: 15px; border-radius: 5px; border: 1px solid #ccc;\" placeholder=\"e.g., 180\"\/>\n\n    <label style=\"display: block; margin-bottom: 5px; font-weight: 600;\">Neck circumference (cm):<\/label>\n    <input type=\"number\" id=\"neck\" style=\"width: 100%; padding: 10px; margin-bottom: 15px; border-radius: 5px; border: 1px solid #ccc;\" placeholder=\"e.g., 38\"\/>\n\n    <label style=\"display: block; margin-bottom: 5px; font-weight: 600;\">Waist circumference (cm):<\/label>\n    <input type=\"number\" id=\"waist\" style=\"width: 100%; padding: 10px; margin-bottom: 15px; border-radius: 5px; border: 1px solid #ccc;\" placeholder=\"e.g., 90\"\/>\n\n    <div id=\"hip-container\" style=\"display: none;\">\n        <label style=\"display: block; margin-bottom: 5px; font-weight: 600;\">Hip circumference (cm):<\/label>\n        <input type=\"number\" id=\"hip\" style=\"width: 100%; padding: 10px; margin-bottom: 15px; border-radius: 5px; border: 1px solid #ccc;\" placeholder=\"e.g., 95\"\/>\n    <\/div>\n\n    <button onclick=\"calculateBF()\" style=\"width: 100%; padding: 12px; background-color: #0073aa; color: white; border: none; border-radius: 5px; cursor: pointer; font-size: 16px; font-weight: bold; transition: background 0.3s;\">Calculate Results<\/button>\n\n    <div id=\"result\" style=\"margin-top: 25px; padding: 15px; border-radius: 5px; background: white; border: 1px solid #eee; display: none;\">\n        <p style=\"margin: 5px 0; color: #555;\">Body Fat Percentage:  <span id=\"bf-val\" style=\"font-weight: bold; color: #000;\"><\/span><\/p>\n        <p style=\"margin: 5px 0; color: #555;\">Lean Body Mass (LBM):  <span id=\"lbm-val\" style=\"font-weight: bold; color: #000;\"><\/span><\/p>\n    <\/div>\n<\/div>\n\n<script>\nfunction toggleHip() {\n    const gender = document.getElementById('gender').value;\n    document.getElementById('hip-container').style.display = (gender === 'female') ? 'block' : 'none';\n}\n\nfunction calculateBF() {\n    const gender = document.getElementById('gender').value;\n    const weight = parseFloat(document.getElementById('weight').value);\n    const height = parseFloat(document.getElementById('height').value);\n    const neck = parseFloat(document.getElementById('neck').value);\n    const waist = parseFloat(document.getElementById('waist').value);\n    \n    let bf = 0;\n\n    if (!weight || !height || !neck || !waist) {\n        alert(\"Prosz\u0119 uzupe\u0142ni\u0107 wszystkie wymagane pola.\");\n        return;\n    }\n\n    if (gender === 'male') {\n        \/\/ Formu\u0142a Navy dla m\u0119\u017cczyzn (logarytm dziesi\u0119tny)\n        bf = 495 \/ (1.0324 - 0.19077 * Math.log10(waist - neck) + 0.15456 * Math.log10(height)) - 450;\n    } else {\n        const hip = parseFloat(document.getElementById('hip').value);\n        if (!hip) {\n            alert(\"Dla kobiet wymagany jest obw\u00f3d bioder.\");\n            return;\n        }\n        \/\/ Formu\u0142a Navy dla kobiet\n        bf = 495 \/ (1.29579 - 0.35004 * Math.log10(waist + hip - neck) + 0.22100 * Math.log10(height)) - 450;\n    }\n\n    \/\/ Obliczanie Lean Body Mass (LBM)\n    const fatMass = weight * (bf \/ 100);\n    const lbm = weight - fatMass;\n\n    \/\/ Wy\u015bwietlanie wynik\u00f3w\n    document.getElementById('result').style.display = 'block';\n    document.getElementById('bf-val').innerText = bf.toFixed(1) + \"%\";\n    document.getElementById('lbm-val').innerText = lbm.toFixed(2) + \" kg\";\n}\n<\/script>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Men (% BF)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Women (% BF)<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>Unhealthy level<\/strong> (essential for organ function, dangerous in the long run) <\/td><td class=\"has-text-align-center\" data-align=\"center\">2\u20135%<\/td><td class=\"has-text-align-center\" data-align=\"center\">10\u201313%<\/td><\/tr><tr><td><strong>Very low level<\/strong> (very good genetics\/athletes &#8211; difficult for the average person to maintain year-round)<\/td><td class=\"has-text-align-center\" data-align=\"center\">6\u201313%<\/td><td class=\"has-text-align-center\" data-align=\"center\">14\u201320%<\/td><\/tr><tr><td><strong>Good result<\/strong> that most people can maintain<\/td><td class=\"has-text-align-center\" data-align=\"center\">14\u201317%<\/td><td class=\"has-text-align-center\" data-align=\"center\">21\u201324%<\/td><\/tr><tr><td><strong>High level<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">18\u201324%<\/td><td class=\"has-text-align-center\" data-align=\"center\">25\u201331%<\/td><\/tr><tr><td><strong>Very unhealthy level<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">25%+<\/td><td class=\"has-text-align-center\" data-align=\"center\">32%+<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Body Fat Percentage Calculator Gender: MaleFemale Weight (kg): Height (cm): Neck circumference (cm): Waist circumference (cm): Hip circumference (cm): Calculate Results Body Fat Percentage: Lean Body Mass (LBM): Men (% BF) Women (% BF) Unhealthy level (essential for organ function, dangerous in the long run) 2\u20135% 10\u201313% Very low level (very good genetics\/athletes &#8211; difficult for the average person to maintain year-round) 6\u201313% 14\u201320% Good result that most people can maintain 14\u201317% 21\u201324% High level 18\u201324% 25\u201331% Very unhealthy level&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[66,16],"tags":[],"class_list":["post-1445","post","type-post","status-publish","format-standard","hentry","category-weight-loss","category-bez-kategorii"],"_links":{"self":[{"href":"https:\/\/powerbuilding.pl\/en\/wp-json\/wp\/v2\/posts\/1445","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/powerbuilding.pl\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/powerbuilding.pl\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/powerbuilding.pl\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/powerbuilding.pl\/en\/wp-json\/wp\/v2\/comments?post=1445"}],"version-history":[{"count":0,"href":"https:\/\/powerbuilding.pl\/en\/wp-json\/wp\/v2\/posts\/1445\/revisions"}],"wp:attachment":[{"href":"https:\/\/powerbuilding.pl\/en\/wp-json\/wp\/v2\/media?parent=1445"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/powerbuilding.pl\/en\/wp-json\/wp\/v2\/categories?post=1445"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/powerbuilding.pl\/en\/wp-json\/wp\/v2\/tags?post=1445"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}