{"id":57723,"date":"2016-01-21T13:57:17","date_gmt":"2016-01-21T11:57:17","guid":{"rendered":"http:\/\/wpcalc.com\/?p=57723"},"modified":"2025-05-30T08:40:34","modified_gmt":"2025-05-30T05:40:34","slug":"fat-free-mass-index","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/beauty\/fat-free-mass-index\/","title":{"rendered":"Fat-Free Mass Index 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 class=\"text-lg font-display font-bold\">FFMI and Adjusted FFMI Calculator<\/h2><\/div><div class=\"relative group inline-block\">\n  <button class=\"favorite\" id=\"favorite\" data-favorite-id=\"57723\" data-favorite-title=\"Fat-Free Mass Index\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/beauty\/fat-free-mass-index\/\" data-favorite-excerpt=\"This calculator estimates your Fat-Free Mass Index (FFMI), a measure of muscle mass relative to height, often used in fitness and bodybuilding. It calculates lean body mass and adjusts FFMI based on a standardized height of 1.8 m (5 ft 11 in) to compare physiques across individuals.\" aria-label=\"Add to Favorites\" data-favorite-icon=\"icon icon-beauty\">\n    <span class=\"icon icon-shape-star-empty\"><\/span>\n  <\/button>\n  <div class=\"absolute right-full -translate-y-1\/2 top-1\/2 mr-2 w-max max-w-xs px-3 py-2 bg-gray-800 text-white text-xs rounded shadow-lg opacity-0 group-hover:opacity-100 transition-opacity duration-200 z-10 pointer-events-none\">\n   <span class=\"favorite-tooltip\" id=\"favorite-tooltip\"><\/span>\n  <\/div>\n<\/div><\/div><form action=\"https:\/\/wpcalc.com\/en\/beauty\/fat-free-mass-index\/\" method=\"POST\" class=\"calculator\" id=\"calculator-57723\" data-post=\"57723\"><fieldset class=\"fieldset-input\"><legend class=\"sr-only\">Input Fields<\/legend><div class=\"field\" id=\"input-1\"><label for=\"field-1\">Unit system<\/label><div class=\"grid grid-cols-1\"><select id=\"field-1\" name=\"unit_system\"><option value=\"metric\">Metric<\/option><option value=\"imperial\">Imperial<\/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\">Weight<\/label><div class=\"term\">W<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"number\" name=\"weight\" id=\"field-2\" min=\"0\" step=\"any\" value=\"70\"\/><div class=\"unit\">kg<\/div><\/div><div class=\"field has-term\" id=\"input-3\"><label for=\"field-3\">Body fat %<\/label><div class=\"term\">BF<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"number\" name=\"body_fat_\" id=\"field-3\" min=\"0\" max=\"70\" step=\"any\" value=\"15\"\/><div class=\"unit\">%<\/div><\/div><div class=\"field has-term\" id=\"input-4\"><label for=\"field-4\">Height<\/label><div class=\"term\">H<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"number\" name=\"height\" id=\"field-4\" min=\"0\" step=\"any\" value=\"180\"\/><div class=\"unit\">cm<\/div><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Re-Calculate\" id=\"calculate-button\" data-post=\"57723\">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>Fat-Free Mass Index (FFMI)<\/span><span class=\"result-term\">FFMI<\/span><\/span><span class=\"field-value\" id=\"result-1\"><\/span><button class=\"copy-result\" data-tooltip=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-2\"><span class=\"field-title\"><span>Adjusted FFMI<\/span><span class=\"result-term\">AFFMI<\/span><\/span><span class=\"field-value\" id=\"result-2\"><\/span><button class=\"copy-result\" data-tooltip=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\"><\/span><\/button><\/div><\/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=\"57723\" aria-live=\"polite\"><h2 class=\"text-sm text-gray-500 text-center mb-2\">How did this result make you feel?<\/h2><div class=\"grid grid-cols-3 sm:flex sm:flex-row sm:justify-around gap-4 sm:items-center sm:flex-wrap\"><button 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\">\ud83d\ude00 <\/span><span class=\"reaction-description font-medium\">Like <\/span><\/button><button 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\">\ud83d\udca1 <\/span><span class=\"reaction-description font-medium\">Helpful <\/span><\/button><button 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\">\ud83d\ude15 <\/span><span class=\"reaction-description font-medium\">Confused <\/span><\/button><button 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\">\ud83d\ude1e <\/span><span class=\"reaction-description font-medium\">Disappointed <\/span><\/button><button 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\">\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><ins class=\"adsbygoogle\"\n     style=\"display:block; text-align:center; margin: 32px 0;\"\n     data-ad-layout=\"in-article\"\n     data-ad-format=\"fluid\"\n     data-ad-client=\"ca-pub-1721569815777345\"\n     data-ad-slot=\"6317458308\"><\/ins>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script>\n<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>Fat-Free Mass Index Formulas<\/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$$\\text{Lean Mass} = \\text{Weight} \\times \\left( 1 &#8211; \\frac{\\text{BodyFat}}{100} \\right)$$\n$$\\text{FFMI} = \\frac{ \\left( \\frac{\\text{Lean}}{2.2} \\right) }{ \\left( \\left( \\text{Height (ft)} \\times 12 + \\text{Inches} \\right) \\times 0.0254 \\right)^2 }$$\n$$\\text{Adjusted FFMI} = \\text{FFMI} + \\left( 6 \\times \\left( \\left( \\left( \\text{Height (ft)} \\times 12 + \\text{Inches} \\right) \\times 0.0254 \\right) &#8211; 1.8 \\right) \\right)$$\n<\/div>\r\n\t<\/figure>\r\n\t<br \/>\r\n<\/section>\n<p>The <strong>Fat-Free Mass Index (FFMI)<\/strong> provides a height-normalized value of lean body mass, useful for assessing muscular development.<\/p>\n<ul>\n<li><strong>Lean body mass<\/strong> is computed from total weight and body fat percentage.<\/li>\n<li>FFMI is often used to benchmark natural muscular limits in athletes.<\/li>\n<li><strong>Adjusted FFMI<\/strong> removes height bias, allowing fairer comparisons.<\/li>\n<\/ul>\n<h3>FFMI Interpretation (Men):<\/h3>\n<ul>\n<li><strong>&lt; 18:<\/strong> Below average<\/li>\n<li><strong>18\u201320:<\/strong> Average<\/li>\n<li><strong>20\u201322:<\/strong> Above average<\/li>\n<li><strong>22\u201325:<\/strong> Excellent<\/li>\n<li><strong>> 25:<\/strong> May indicate steroid use<\/li>\n<\/ul>\n<h3>FFMI Interpretation (Women):<\/h3>\n<p>(Generally 2\u20133 points lower than male values)<\/p>\n<p>It&#8217;s commonly used with food tracking apps and nutritional plans.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This calculator estimates your Fat-Free Mass Index (FFMI), a measure of muscle mass relative to height, often used in fitness and bodybuilding. It calculates lean body mass and adjusts FFMI based on a standardized height of 1.8 m (5 ft 11 in) to compare physiques across individuals.<\/p>\n","protected":false},"author":70,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2],"tags":[38],"class_list":["post-57723","post","type-post","status-publish","format-standard","hentry","category-beauty","tag-fitness"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/57723","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\/70"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/comments?post=57723"}],"version-history":[{"count":1,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/57723\/revisions"}],"predecessor-version":[{"id":64050,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/57723\/revisions\/64050"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=57723"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=57723"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=57723"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}