{"id":65764,"date":"2026-10-14T10:41:51","date_gmt":"2026-10-14T05:11:51","guid":{"rendered":"https:\/\/www.quickonlinetips.com\/archives\/?page_id=65764"},"modified":"2026-10-14T14:31:06","modified_gmt":"2026-10-14T09:01:06","slug":"bmi-calculator","status":"publish","type":"page","link":"https:\/\/www.quickonlinetips.com\/archives\/tools\/bmi-calculator\/","title":{"rendered":"BMI Calculator: Body Mass Index for Adults"},"content":{"rendered":"<p>This <strong>BMI calculator<\/strong> works out your body mass index from your height and weight, in metric (cm and kg) or US units (feet, inches and pounds). It shows your BMI category using the standard adult ranges from the World Health Organization and the CDC, plus the weight range considered healthy for your height. 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.qt-lb{display:inline-flex;width:44px;height:44px;border-radius:50%;align-items:center;justify-content:center;font-weight:700;font-size:17px;background:#fff;color:#1A202C;border:2px solid var(--qt-accent);margin:3px} .qt-tool .qt-lb.qt-bonus{background:#E53E3E;color:#fff;border-color:#E53E3E} .qt-tool .qt-8{width:230px;height:230px;border-radius:50%;margin:16px auto;background:radial-gradient(circle at 35% 30%,#666,#000 62%);display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 10px 24px rgba(0,0,0,.35)} .qt-tool .qt-8 span{width:116px;height:116px;border-radius:50%;background:radial-gradient(circle,#2747a8,#0b1a4a);color:#fff;display:flex;align-items:center;justify-content:center;text-align:center;font-size:13px;font-weight:700;padding:16px;box-sizing:border-box;line-height:1.25;transition:opacity .3s} .qt-tool .qt-shake{animation:qt-shake .7s} @keyframes qt-shake{0%,100%{transform:translate(0)}20%{transform:translate(-12px,4px) rotate(-6deg)}40%{transform:translate(10px,-6px) rotate(5deg)}60%{transform:translate(-8px,6px) rotate(-4deg)}80%{transform:translate(6px,-3px) rotate(3deg)}} .qt-tool .qt-grid>.qt-field{display:flex;flex-direction:column;justify-content:flex-end} .qt-tool .qt-field input[type=range]{height:46px;padding:0 10px} .qt-tool .qt-field input[type=color]{height:46px} .qt-tool .qt-drop .qt-sub{font-weight:400;font-size:14px;margin:4px 0 0} .qt-tool .qt-board{display:grid;gap:5px;margin:14px auto 0;max-width:100%;user-select:none;-webkit-user-select:none;touch-action:manipulation} .qt-tool .qt-cell{display:flex;align-items:center;justify-content:center;background:#fff;border:1px solid #AEC3DB;border-radius:6px;font-weight:700;cursor:pointer;aspect-ratio:1;font-size:clamp(14px,4vw,26px);color:#1A202C;padding:0;min-width:0;font-family:inherit;line-height:1} .qt-tool .qt-cell:disabled{cursor:default} .qt-tool .qt-win{background:#C6F6D5;border-color:#38A169} .qt-tool .qt-sel{background:#BEE3F8;border-color:#3182CE} .qt-tool .qt-bad{background:#FED7D7;border-color:#E53E3E} .qt-tool select{-webkit-appearance:none;-moz-appearance:none;appearance:none;padding-right:40px;cursor:pointer;border:2px solid #90B4DA;font-weight:600;background-color:#fff;background-image:url(\"data:image\/svg+xml,%3Csvg xmlns='http:\/\/www.w3.org\/2000\/svg' viewBox='0 0 14 9'%3E%3Cpath d='M1.5 1.5l5.5 5.5 5.5-5.5' fill='none' stroke='%232B6CB0' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'\/%3E%3C\/svg%3E\");background-repeat:no-repeat;background-position:right 14px center;background-size:14px 9px} .qt-tool select:hover{border-color:var(--qt-accent);background-color:#F4F8FD} .qt-tool select::-ms-expand{display:none} .qt-next{margin:0 0 1.75em} .qt-next .qt-next-h{font-size:14px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:#4A5568;margin:0 0 8px} .qt-next-g{display:grid;grid-template-columns:repeat(3,1fr);gap:8px} .qt-next-g a{display:flex;align-items:center;min-height:46px;padding:9px 12px;border:1px solid #AEC3DB;border-radius:8px;background:#F4F8FD;color:#215387;font-weight:600;font-size:15px;line-height:1.3;text-decoration:none} .qt-next-g a:hover,.qt-next-g a:focus{background:#E3EEFF;border-color:#2B6CB0;text-decoration:none} @media (max-width:600px){.qt-next-g{grid-template-columns:repeat(2,1fr)}}<\/style>\n<div class=\"qt-tool\" id=\"qt-bmi\">\n<div class=\"qt-tabs\" role=\"group\" aria-label=\"Units\"><button type=\"button\" data-qt-u=\"m\" aria-selected=\"true\">Metric (cm, kg)<\/button><button type=\"button\" data-qt-u=\"us\" aria-selected=\"false\">US (ft, in, lb)<\/button><\/div>\n<div class=\"qt-grid\" id=\"qt-bmi-m\">\n<div class=\"qt-field\"><label for=\"qt-bmi-cm\">Height (cm)<\/label><input type=\"number\" id=\"qt-bmi-cm\" value=\"170\" min=\"50\" max=\"250\" step=\"0.1\" inputmode=\"decimal\"><\/div>\n<div class=\"qt-field\"><label for=\"qt-bmi-kg\">Weight (kg)<\/label><input type=\"number\" id=\"qt-bmi-kg\" value=\"68\" min=\"10\" max=\"400\" step=\"0.1\" inputmode=\"decimal\"><\/div>\n<\/div>\n<div class=\"qt-grid\" id=\"qt-bmi-us\" hidden>\n<div class=\"qt-field\"><label for=\"qt-bmi-ft\">Height (feet)<\/label><input type=\"number\" id=\"qt-bmi-ft\" value=\"5\" min=\"1\" max=\"8\" inputmode=\"numeric\"><\/div>\n<div class=\"qt-field\"><label for=\"qt-bmi-in\">Inches<\/label><input type=\"number\" id=\"qt-bmi-in\" value=\"7\" min=\"0\" max=\"11.9\" step=\"0.1\" inputmode=\"decimal\"><\/div>\n<div class=\"qt-field\"><label for=\"qt-bmi-lb\">Weight (lb)<\/label><input type=\"number\" id=\"qt-bmi-lb\" value=\"150\" min=\"20\" max=\"900\" step=\"0.1\" inputmode=\"decimal\"><\/div>\n<\/div>\n<div class=\"qt-result\" id=\"qt-bmi-res\" aria-live=\"polite\">&#8211;<\/div>\n<div class=\"qt-explain\" id=\"qt-bmi-cat\"><\/div>\n<div class=\"qt-meter\" aria-hidden=\"true\" style=\"background:linear-gradient(90deg,#63B3ED 0,#63B3ED 25.86%,#48BB78 25.86%,#48BB78 48.28%,#ECC94B 48.28%,#ECC94B 65.52%,#F56565 65.52%,#F56565 100%);position:relative;overflow:visible\"><span id=\"qt-bmi-mark\" style=\"position:absolute;top:-6px;width:4px;height:34px;background:#1A202C;border-radius:2px;left:0\"><\/span><\/div>\n<div class=\"qt-small\" style=\"text-align:left;margin-top:6px\">Blue: underweight \u00b7 Green: healthy \u00b7 Yellow: overweight \u00b7 Red: obesity<\/div>\n<div class=\"qt-stats\">\n<div class=\"qt-stat\"><span class=\"qt-num\" id=\"qt-bmi-range\">&#8211;<\/span><span class=\"qt-lab\">Healthy weight for your height<\/span><\/div>\n<div class=\"qt-stat\"><span class=\"qt-num\" id=\"qt-bmi-prime\">&#8211;<\/span><span class=\"qt-lab\">BMI Prime<\/span><\/div>\n<\/div>\n<div class=\"qt-status\" id=\"qt-bmi-status\" aria-live=\"polite\"><\/div>\n<p class=\"qt-note\">Calculated in your browser. Your height and weight are not sent to or stored on our server. This tool is for adults aged 20 and over and is not medical advice.<\/p>\n<\/div>\n<p><script>(function () { function qtReady(fn) { if (document.readyState === 'loading') { document.addEventListener('DOMContentLoaded', fn); } else { fn(); } } function qtCopy(text, statusEl, okMsg) { function done(ok) { if (statusEl) { statusEl.textContent = ok ? (okMsg || 'Copied to clipboard.') : 'Press Ctrl+C (or Cmd+C) to copy.'; } } function fallback() { var ta = document.createElement('textarea'); ta.value = text; ta.setAttribute('readonly', ''); ta.style.position = 'fixed'; ta.style.top = '-1000px'; document.body.appendChild(ta); ta.select(); var ok = false; try { ok = document.execCommand('copy'); } catch (e) { ok = false; } document.body.removeChild(ta); done(ok); } if (navigator.clipboard) { if (window.isSecureContext) { navigator.clipboard.writeText(text).then(function () { done(true); }, fallback); return; } } fallback(); } function qtRand32() { var c = window.crypto || window.msCrypto; if (c) { if (c.getRandomValues) { var a = new Uint32Array(1); c.getRandomValues(a); return a[0]; } } return Math.floor(Math.random() * 4294967296); } function qtRandInt(range) { if (range === 4294967296) { return qtRand32(); } var limit = Math.floor(4294967296 \/ range) * range; var x = qtRand32(); while (x >= limit) { x = qtRand32(); } return x % range; } qtReady(function () { var box = document.getElementById('qt-bmi'); if (!box) { return; } function $(id) { return document.getElementById(id); } var unit = 'm'; function v(id) { var x = parseFloat($(id).value); return isFinite(x) ? x : NaN; } function calc() { var m, kg; if (unit === 'm') { m = v('qt-bmi-cm') \/ 100; kg = v('qt-bmi-kg'); } else { m = ((v('qt-bmi-ft') || 0) * 12 + (v('qt-bmi-in') || 0)) * 0.0254; kg = v('qt-bmi-lb') * 0.45359237; } if (!(m > 0.5) || !(kg > 5)) { $('qt-bmi-res').textContent = '-'; $('qt-bmi-cat').textContent = 'Enter your height and weight.'; return; } var bmi = kg \/ (m * m), cat; if (18.5 > bmi) { cat = 'Underweight'; } else if (25 > bmi) { cat = 'Healthy weight'; } else if (30 > bmi) { cat = 'Overweight'; } else if (35 > bmi) { cat = 'Obesity class 1'; } else if (40 > bmi) { cat = 'Obesity class 2'; } else { cat = 'Obesity class 3 (severe)'; } $('qt-bmi-res').textContent = bmi.toFixed(1); $('qt-bmi-cat').textContent = 'BMI category: ' + cat; var pos = Math.min(100, Math.max(0, (bmi - 11) \/ 29 * 100)); $('qt-bmi-mark').style.left = 'calc(' + pos + '% - 2px)'; var lo = 18.5 * m * m, hi = 24.9 * m * m; $('qt-bmi-range').textContent = unit === 'm' ? lo.toFixed(1) + ' to ' + hi.toFixed(1) + ' kg' : (lo \/ 0.45359237).toFixed(0) + ' to ' + (hi \/ 0.45359237).toFixed(0) + ' lb'; $('qt-bmi-prime').textContent = (bmi \/ 25).toFixed(2); $('qt-bmi-status').textContent = 'Height ' + (m * 100).toFixed(0) + ' cm, weight ' + kg.toFixed(1) + ' kg.'; } Array.prototype.forEach.call(document.querySelectorAll('[data-qt-u]'), function (b) { b.addEventListener('click', function () { var nu = b.getAttribute('data-qt-u'); if (nu === unit) { return; } if (nu === 'us') { var cm = v('qt-bmi-cm'), kg = v('qt-bmi-kg'); if (cm > 0) { var tin = cm \/ 2.54; $('qt-bmi-ft').value = Math.floor(tin \/ 12); $('qt-bmi-in').value = (tin % 12).toFixed(1); } if (kg > 0) { $('qt-bmi-lb').value = (kg \/ 0.45359237).toFixed(1); } } else { var t = (v('qt-bmi-ft') || 0) * 12 + (v('qt-bmi-in') || 0), lb = v('qt-bmi-lb'); if (t > 0) { $('qt-bmi-cm').value = (t * 2.54).toFixed(1); } if (lb > 0) { $('qt-bmi-kg').value = (lb * 0.45359237).toFixed(1); } } unit = nu; $('qt-bmi-m').hidden = unit !== 'm'; $('qt-bmi-us').hidden = unit === 'm'; Array.prototype.forEach.call(document.querySelectorAll('[data-qt-u]'), function (x) { x.setAttribute('aria-selected', x === b ? 'true' : 'false'); }); calc(); }); }); Array.prototype.forEach.call(box.querySelectorAll('input'), function (e) { e.addEventListener('input', calc); }); calc(); }); })();<\/script><\/p>\n<div class=\"qt-next\">\n<p class=\"qt-next-h\">Try another free tool<\/p>\n<div class=\"qt-next-g\"><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/days-between-dates\/\">Days Between Dates<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/age-calculator\/\">Age Calculator<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/percentage-calculator\/\">Percentage Calculator<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/online-stopwatch\/\">Stopwatch and Timer<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/average-calculator\/\">Average Calculator<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/fraction-calculator\/\">Fraction Calculator<\/a><\/div>\n<\/div>\n<p><strong>Quick answer:<\/strong> BMI = weight in kilograms \u00f7 (height in metres)\u00b2. For someone 170 cm tall weighing 68 kg: 68 \u00f7 (1.70 \u00d7 1.70) = 23.5, which is in the healthy range of 18.5 to 24.9. In US units, BMI = 703 \u00d7 weight in pounds \u00f7 (height in inches)\u00b2.<\/p>\n<h2>BMI chart for adults<\/h2>\n<table class=\"qt-ref\">\n<thead>\n<tr>\n<th>BMI<\/th>\n<th>Category<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Below 18.5<\/td>\n<td>Underweight<\/td>\n<\/tr>\n<tr>\n<td>18.5 to 24.9<\/td>\n<td>Healthy weight<\/td>\n<\/tr>\n<tr>\n<td>25.0 to 29.9<\/td>\n<td>Overweight<\/td>\n<\/tr>\n<tr>\n<td>30.0 to 34.9<\/td>\n<td>Obesity class 1<\/td>\n<\/tr>\n<tr>\n<td>35.0 to 39.9<\/td>\n<td>Obesity class 2<\/td>\n<\/tr>\n<tr>\n<td>40 and above<\/td>\n<td>Obesity class 3 (severe obesity)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>These are the adult categories used by the <a href=\"https:\/\/www.who.int\/\" target=\"_blank\" rel=\"noopener\">World Health Organization<\/a> and the US <a href=\"https:\/\/www.cdc.gov\/bmi\/\" target=\"_blank\" rel=\"noopener\">CDC<\/a>. They apply to adults aged 20 and over, for both men and women.<\/p>\n<h2>How to use the BMI calculator<\/h2>\n<ol>\n<li>Choose metric or US units. Switching converts the values you entered.<\/li>\n<li>Enter your height and weight. The BMI, category and marker on the color scale update as you type.<\/li>\n<li><strong>Healthy weight for your height<\/strong> shows the weight range that gives a BMI of 18.5 to 24.9.<\/li>\n<li><strong>BMI Prime<\/strong> is your BMI divided by 25, the upper healthy limit; values above 1.0 are above the healthy range.<\/li>\n<\/ol>\n<h2>Limits of BMI<\/h2>\n<p>BMI is a simple screening tool based only on height and weight. It doesn&#8217;t measure body fat directly or show where fat is stored, so it can be misleading for some people:<\/p>\n<ul>\n<li><strong>Muscular people<\/strong> and athletes can have a high BMI with little body fat.<\/li>\n<li><strong>Older adults<\/strong> may have a normal BMI but less muscle and more fat.<\/li>\n<li><strong>Ethnicity:<\/strong> health risks can start at lower BMIs in people of South Asian, Chinese and some other Asian backgrounds. The WHO has suggested lower action points for Asian populations, and UK guidance (NICE) uses 23 and 27.5 as thresholds for overweight and obesity in these groups.<\/li>\n<li><strong>Pregnancy:<\/strong> BMI isn&#8217;t used to assess weight during pregnancy.<\/li>\n<li><strong>Children and teens<\/strong> need BMI-for-age percentiles, which compare them with others of the same age and sex. Use the CDC&#8217;s child and teen BMI calculator instead.<\/li>\n<\/ul>\n<p>Waist size adds useful information: a waist over about 102 cm (40 in) for men or 88 cm (35 in) for women is linked to higher health risks. For a full picture, talk to a doctor, who can consider blood pressure, blood tests and family history.<\/p>\n<p>Track progress with our <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/percentage-calculator\/\">percentage calculator<\/a>, or time workouts with the <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/online-stopwatch\/\">stopwatch and timer<\/a>.<\/p>\n<h2>FAQ<\/h2>\n<h3>Is BMI different for men and women?<\/h3>\n<p>For adults, the same BMI ranges apply to both. Body fat at a given BMI usually differs, though.<\/p>\n<h3>Is my data saved?<\/h3>\n<p>No. The calculation happens in your browser and nothing is stored.<\/p>\n<h2>More free tools<\/h2>\n<div class=\"qt-cards\"><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/days-between-dates\/\"><strong>Days Between Dates<\/strong><span>Count days, weeks and business days between two dates.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/age-calculator\/\"><strong>Age Calculator<\/strong><span>Your exact age in years, months and days, plus next birthday.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/percentage-calculator\/\"><strong>Percentage Calculator<\/strong><span>Work out X% of Y, percent change and more.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/online-stopwatch\/\"><strong>Stopwatch and Timer<\/strong><span>Online stopwatch with laps and a countdown timer with alarm.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/average-calculator\/\"><strong>Average Calculator<\/strong><span>Mean, median, mode and range of a list of numbers.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/fraction-calculator\/\"><strong>Fraction Calculator<\/strong><span>Add, subtract, multiply and divide fractions with steps.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/gpa-calculator\/\"><strong>GPA Calculator<\/strong><span>Semester and cumulative GPA on the 4.0 scale.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/tip-calculator\/\"><strong>Tip Calculator<\/strong><span>Work out the tip and split the bill between people.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/hours-calculator\/\"><strong>Hours Calculator<\/strong><span>Hours and minutes between two times, plus a time card.<\/span><\/a><\/div>\n<p>See all of them on the <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/\">QuickOnlineTips free online tools<\/a> page and play our <a href=\"https:\/\/www.quickonlinetips.com\/archives\/games\/\">free online games<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This BMI calculator works out your body mass index from your height and weight, in metric (cm and kg) or US units (feet, inches and pounds). It shows your BMI category using the standard adult ranges from the World Health Organization and the CDC, plus the weight range considered healthy for your height. BMI is&#8230;<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":65595,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"class_list":["post-65764","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65764","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/comments?post=65764"}],"version-history":[{"count":3,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65764\/revisions"}],"predecessor-version":[{"id":66462,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65764\/revisions\/66462"}],"up":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65595"}],"wp:attachment":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/media?parent=65764"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}