{"id":2431,"date":"2026-02-13T22:27:45","date_gmt":"2026-02-13T20:27:45","guid":{"rendered":"https:\/\/bio-me.bio\/?page_id=2431"},"modified":"2026-02-17T20:53:31","modified_gmt":"2026-02-17T18:53:31","slug":"bmr-calculator-mifflin-st-jeor","status":"publish","type":"page","link":"https:\/\/bio-me.bio\/?page_id=2431","title":{"rendered":"BMR Calculator (Mifflin\u2013St Jeor)"},"content":{"rendered":"\n<div class=\"eco-tool wp-block-group\" id=\"eco-tool-bmr-a13d6\">\n  <div class=\"eco-tool__header\">\n    <h2 class=\"eco-tool__title\">BMR Calculator (Mifflin\u2013St Jeor)<\/h2>\n    <p class=\"eco-tool__lead\">\n      Estimate Basal Metabolic Rate (BMR) in kcal\/day from age, sex, height, and weight. Educational estimate.\n    <\/p>\n  <\/div>\n\n  <form class=\"eco-tool__form\" id=\"eco-bmr-form-a13d6\" novalidate>\n    <div class=\"eco-tool__grid3\">\n      <!-- Sex -->\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-bmr-sex-a13d6\">\n          Sex<br>(formula)\n        <\/label>\n        <select class=\"eco-tool__input\" id=\"eco-bmr-sex-a13d6\">\n          <option value=\"male\" selected>Male<\/option>\n          <option value=\"female\">Female<\/option>\n        <\/select>\n        <div class=\"eco-tool__hint\">The equation uses a sex constant.<\/div>\n      <\/div>\n\n      <!-- Age -->\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-bmr-age-a13d6\">\n          Age<br>(years)\n        <\/label>\n        <input class=\"eco-tool__input\" id=\"eco-bmr-age-a13d6\" type=\"number\" min=\"5\" max=\"110\" step=\"1\" placeholder=\"e.g., 30\" inputmode=\"numeric\" \/>\n        <div class=\"eco-tool__hint\">Enter your age in years.<\/div>\n      <\/div>\n\n      <!-- Height -->\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-bmr-height-a13d6\">\n          Height<br>(cm)\n        <\/label>\n        <input class=\"eco-tool__input\" id=\"eco-bmr-height-a13d6\" type=\"number\" min=\"0\" step=\"any\" placeholder=\"e.g., 175\" inputmode=\"decimal\" \/>\n        <div class=\"eco-tool__hint\">Height in centimeters.<\/div>\n      <\/div>\n\n      <!-- Weight -->\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-bmr-weight-a13d6\">\n          Weight<br>(kg)\n        <\/label>\n        <input class=\"eco-tool__input\" id=\"eco-bmr-weight-a13d6\" type=\"number\" min=\"0\" step=\"any\" placeholder=\"e.g., 70\" inputmode=\"decimal\" \/>\n        <div class=\"eco-tool__hint\">Weight in kilograms.<\/div>\n      <\/div>\n\n      <!-- Formula box -->\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\">Formula<\/label>\n        <div class=\"eco-tool__noteBox\">\n          BMR = 10\u00d7kg + 6.25\u00d7cm \u2212 5\u00d7age + s<br>\n          s = +5 (male), \u2212161 (female)\n        <\/div>\n        <div class=\"eco-tool__hint\">Mifflin\u2013St Jeor equation.<\/div>\n      <\/div>\n\n      <!-- Note -->\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\">Note<\/label>\n        <div class=\"eco-tool__noteBox\">\n          BMR is the estimated calories your body uses at rest. Daily needs vary with activity and other factors.\n        <\/div>\n        <div class=\"eco-tool__hint\">This is not a medical diagnosis.<\/div>\n      <\/div>\n    <\/div>\n\n    <div class=\"eco-tool__actions\">\n      <button type=\"button\" class=\"wp-element-button eco-tool__btn\" id=\"eco-bmr-calc-a13d6\">Calculate<\/button>\n      <button type=\"button\" class=\"wp-element-button eco-tool__btn eco-tool__btn--ghost\" id=\"eco-bmr-reset-a13d6\">Reset<\/button>\n      <div class=\"eco-tool__error\" id=\"eco-bmr-error-a13d6\" aria-live=\"polite\"><\/div>\n    <\/div>\n  <\/form>\n\n  <div class=\"eco-tool__result\" id=\"eco-bmr-result-a13d6\" hidden>\n    <h3 class=\"eco-tool__subtitle\">Result<\/h3>\n\n    <div class=\"eco-tool__cards\">\n      <div class=\"eco-tool__card\">\n        <div class=\"eco-tool__metric-label\">Estimated BMR<\/div>\n        <div class=\"eco-tool__metric-value\" id=\"eco-bmr-out-a13d6\">\u2014<\/div>\n        <div class=\"eco-tool__metric-sub\">kcal\/day<\/div>\n      <\/div>\n\n      <div class=\"eco-tool__card\">\n        <div class=\"eco-tool__metric-label\">Calculation<\/div>\n        <div class=\"eco-tool__metric-sub\" id=\"eco-bmr-eq-a13d6\">\u2014<\/div>\n        <div class=\"eco-tool__metric-sub eco-tool__muted\">Rounded for readability<\/div>\n      <\/div>\n    <\/div>\n\n    <p class=\"eco-tool__note\">\n      Want daily calorie needs? Next we can add a TDEE calculator (BMR \u00d7 activity factor).\n    <\/p>\n  <\/div>\n<\/div>\n\n<style>\n.eco-tool{border:1px solid rgba(0,0,0,.12);border-radius:12px;padding:16px}\n.eco-tool__grid3{display:grid;grid-template-columns:1fr;gap:16px}\n@media (min-width:860px){.eco-tool__grid3{grid-template-columns:1fr 1fr 1fr}}\n.eco-tool__field{display:flex;flex-direction:column;gap:6px}\n.eco-tool__label{font-weight:600}\n.eco-tool__input{height:44px;padding:0 12px;border:1px solid rgba(0,0,0,.2);border-radius:10px;background:#fff;font:inherit;box-sizing:border-box}\n.eco-tool select.eco-tool__input{appearance:none;padding-right:40px}\n.eco-tool__hint{font-size:.92em;opacity:.78;min-height:38px}\n.eco-tool__noteBox{border:1px solid rgba(0,0,0,.12);border-radius:12px;padding:12px;background:rgba(0,0,0,.02);min-height:44px}\n\n.eco-tool__actions{display:flex;gap:10px;margin-top:16px;align-items:center;flex-wrap:wrap}\n.eco-tool__btn{padding:10px 22px}\n.eco-tool__btn--ghost{background:transparent!important;border:1px solid rgba(0,0,0,.2)!important}\n.eco-tool__btn--ghost:hover,.eco-tool__btn--ghost:focus{background:rgba(0,0,0,.06)!important;border-color:rgba(0,0,0,.35)!important}\n.eco-tool__error{font-weight:600;min-height:1.2em;flex:1 1 240px}\n\n.eco-tool__result{margin-top:16px}\n.eco-tool__subtitle{margin:0 0 10px}\n.eco-tool__cards{display:grid;gap:10px;grid-template-columns:1fr}\n@media (min-width:860px){.eco-tool__cards{grid-template-columns:1fr 1fr}}\n.eco-tool__card{border:1px solid rgba(0,0,0,.12);border-radius:12px;padding:12px}\n.eco-tool__metric-label{opacity:.85;font-weight:600}\n.eco-tool__metric-value{font-size:1.6em;font-weight:800;margin-top:6px;line-height:1.1}\n.eco-tool__metric-sub{opacity:.85;margin-top:6px}\n.eco-tool__muted{opacity:.8}\n.eco-tool__note{margin-top:10px;opacity:.9}\n<\/style>\n\n<script>\n(function(){\n  const S=\"a13d6\";\n  const el=(id)=>document.getElementById(id+\"-\"+S);\n\n  const sexEl=el(\"eco-bmr-sex\");\n  const ageEl=el(\"eco-bmr-age\");\n  const hEl=el(\"eco-bmr-height\");\n  const wEl=el(\"eco-bmr-weight\");\n\n  const calcBtn=el(\"eco-bmr-calc\");\n  const resetBtn=el(\"eco-bmr-reset\");\n  const errEl=el(\"eco-bmr-error\");\n\n  const resEl=el(\"eco-bmr-result\");\n  const outEl=el(\"eco-bmr-out\");\n  const eqEl=el(\"eco-bmr-eq\");\n\n  function setError(msg){ errEl.textContent = msg || \"\"; }\n  function fmt(n,d){\n    if(!Number.isFinite(n)) return \"\u2014\";\n    return Number(n).toLocaleString(undefined,{maximumFractionDigits:d});\n  }\n\n  function calculate(){\n    setError(\"\");\n\n    const sex = sexEl.value;\n    const age = Number(ageEl.value);\n    const cm = Number(hEl.value);\n    const kg = Number(wEl.value);\n\n    if(!Number.isFinite(age) || age <= 0){\n      setError(\"Enter a valid age (years).\");\n      resEl.hidden = true;\n      return;\n    }\n    if(!Number.isFinite(cm) || cm <= 0){\n      setError(\"Enter a valid height (cm).\");\n      resEl.hidden = true;\n      return;\n    }\n    if(!Number.isFinite(kg) || kg <= 0){\n      setError(\"Enter a valid weight (kg).\");\n      resEl.hidden = true;\n      return;\n    }\n\n    const s = (sex === \"male\") ? 5 : -161;\n    const bmr = (10 * kg) + (6.25 * cm) - (5 * age) + s;\n\n    outEl.textContent = `${fmt(bmr,0)} kcal\/day`;\n    eqEl.textContent = `BMR = 10\u00d7${fmt(kg,1)} + 6.25\u00d7${fmt(cm,1)} \u2212 5\u00d7${fmt(age,0)} + (${s}) = ${fmt(bmr,1)}`;\n\n    resEl.hidden = false;\n  }\n\n  function reset(){\n    sexEl.value = \"male\";\n    ageEl.value = \"\";\n    hEl.value = \"\";\n    wEl.value = \"\";\n    setError(\"\");\n    resEl.hidden = true;\n  }\n\n  calcBtn.addEventListener(\"click\", calculate);\n  resetBtn.addEventListener(\"click\", reset);\n})();\n<\/script>\n\n","protected":false},"excerpt":{"rendered":"<p>BMR Calculator (Mifflin\u2013St Jeor) Estimate Basal Metabolic Rate (BMR) in kcal\/day from age, sex, height, and weight. Educational estimate. Sex(formula) MaleFemale The equation uses a sex constant. Age(years) Enter your&hellip;<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":2457,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","footnotes":""},"_links":{"self":[{"href":"https:\/\/bio-me.bio\/index.php?rest_route=\/wp\/v2\/pages\/2431"}],"collection":[{"href":"https:\/\/bio-me.bio\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/bio-me.bio\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/bio-me.bio\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/bio-me.bio\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2431"}],"version-history":[{"count":1,"href":"https:\/\/bio-me.bio\/index.php?rest_route=\/wp\/v2\/pages\/2431\/revisions"}],"predecessor-version":[{"id":2432,"href":"https:\/\/bio-me.bio\/index.php?rest_route=\/wp\/v2\/pages\/2431\/revisions\/2432"}],"up":[{"embeddable":true,"href":"https:\/\/bio-me.bio\/index.php?rest_route=\/wp\/v2\/pages\/2457"}],"wp:attachment":[{"href":"https:\/\/bio-me.bio\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2431"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}