{"id":65883,"date":"2026-10-14T12:15:14","date_gmt":"2026-10-14T06:45:14","guid":{"rendered":"https:\/\/www.quickonlinetips.com\/archives\/?page_id=65883"},"modified":"2026-10-15T10:48:04","modified_gmt":"2026-10-15T05:18:04","slug":"due-date-calculator","status":"publish","type":"page","link":"https:\/\/www.quickonlinetips.com\/archives\/tools\/due-date-calculator\/","title":{"rendered":"Due Date Calculator: When Is My Baby Due?"},"content":{"rendered":"<p>This <strong>due date calculator<\/strong> estimates when your baby is due and how far along you are today. 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.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-dd\">\n<div class=\"qt-grid\">\n<div class=\"qt-field\"><label for=\"qt-dd-m\">Based on<\/label><select id=\"qt-dd-m\"><option value=\"lmp\" selected>First day of last period<\/option><option value=\"con\">Conception date<\/option><option value=\"ivf3\">IVF transfer (day 3 embryo)<\/option><option value=\"ivf5\">IVF transfer (day 5 embryo)<\/option><\/select><\/div>\n<div class=\"qt-field\"><label for=\"qt-dd-d\">Date<\/label><input type=\"date\" id=\"qt-dd-d\"><\/div>\n<div class=\"qt-field\" id=\"qt-dd-cbox\"><label for=\"qt-dd-c\">Average cycle length (days)<\/label><input type=\"number\" id=\"qt-dd-c\" value=\"28\" min=\"20\" max=\"45\"><\/div>\n<\/div>\n<div class=\"qt-result qt-roman\" id=\"qt-dd-out\" aria-live=\"polite\" style=\"font-size:26px\"><\/div>\n<div class=\"qt-stats\">\n<div class=\"qt-stat\"><span class=\"qt-num\" id=\"qt-dd-wk\">&#8211;<\/span><span class=\"qt-lab\">Weeks pregnant today<\/span><\/div>\n<div class=\"qt-stat\"><span class=\"qt-num\" id=\"qt-dd-tri\">&#8211;<\/span><span class=\"qt-lab\">Trimester<\/span><\/div>\n<div class=\"qt-stat\"><span class=\"qt-num\" id=\"qt-dd-left\">&#8211;<\/span><span class=\"qt-lab\">Days to go<\/span><\/div>\n<\/div>\n<div class=\"qt-status\" id=\"qt-dd-status\" aria-live=\"polite\"><\/div>\n<table class=\"qt-table\">\n<thead>\n<tr>\n<th>Milestone<\/th>\n<th>Week<\/th>\n<th>Date<\/th>\n<\/tr>\n<\/thead>\n<tbody id=\"qt-dd-out2\"><\/tbody>\n<\/table>\n<p class=\"qt-note\">Everything runs in your browser. Nothing you enter is sent to or stored on our server.<\/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 dEl = document.getElementById('qt-dd-d'); if (!dEl) { return; } function $(id) { return document.getElementById(id); } var DAY = 864e5; function pad(n) { return (n > 9 ? '' : '0') + n; } function parse(v) { var m = v.match(\/^(\\d{4})-(\\d\\d)-(\\d\\d)$\/); return m ? Date.UTC(+m[1], +m[2] - 1, +m[3]) : NaN; } function fmt(t) { return new Date(t).toLocaleDateString('en-US', { timeZone: 'UTC', weekday: 'short', month: 'long', day: 'numeric', year: 'numeric' }); } var now = new Date(), today = Date.UTC(now.getFullYear(), now.getMonth(), now.getDate()); var MS = [['Positive home test likely', 4], ['Heartbeat often seen on ultrasound', 6], ['End of first trimester', 13], ['Anatomy scan', 20], ['Third trimester begins', 28], ['Full term', 37], ['Due date', 40], ['Usually induced by', 42]]; function upd() { var mode = $('qt-dd-m').value, t = parse(dEl.value), cyc = parseFloat($('qt-dd-c').value) || 28; $('qt-dd-cbox').style.display = mode === 'lmp' ? '' : 'none'; var st = $('qt-dd-status'); st.textContent = ''; st.classList.remove('qt-error'); var body = $('qt-dd-out2'); body.textContent = ''; if (!isFinite(t)) { return; } if (20 > cyc || cyc > 45) { cyc = 28; } var lmp = mode === 'lmp' ? t + (cyc - 28) * DAY : (mode === 'con' ? t - 14 * DAY : t - (mode === 'ivf3' ? 17 : 19) * DAY); var due = lmp + 280 * DAY; var ga = Math.round((today - lmp) \/ DAY); $('qt-dd-out').textContent = 'Estimated due date: ' + fmt(due); if (0 > ga) { st.textContent = 'That date is in the future. Pick a date in the past.'; st.classList.add('qt-error'); } if (ga > 300) { st.textContent = 'That date is more than 42 weeks ago.'; } var w = Math.floor(Math.max(ga, 0) \/ 7), d = Math.max(ga, 0) % 7; $('qt-dd-wk').textContent = ga >= 0 ? (300 > ga ? w + 'w ' + d + 'd' : '-') : '-'; $('qt-dd-tri').textContent = ga >= 0 ? (300 > ga ? (98 > ga ? '1st' : (196 > ga ? '2nd' : '3rd')) : '-') : '-'; var left = Math.round((due - today) \/ DAY); $('qt-dd-left').textContent = left >= 0 ? left : '-'; if (!st.textContent) { st.textContent = 'Estimated conception: around ' + fmt(lmp + 14 * DAY) + '. Only about 1 in 25 babies arrives on the due date; most come within two weeks either side.'; } MS.forEach(function (m) { var tr = document.createElement('tr'); var dt = lmp + m[1] * 7 * DAY; [m[0], String(m[1]), fmt(dt)].forEach(function (x) { var td = document.createElement('td'); td.textContent = x; tr.appendChild(td); }); if (today >= dt) { tr.style.opacity = '.6'; } body.appendChild(tr); }); } var def = new Date(today - 70 * DAY); dEl.value = def.getUTCFullYear() + '-' + pad(def.getUTCMonth() + 1) + '-' + pad(def.getUTCDate()); ['qt-dd-d', 'qt-dd-c'].forEach(function (id) { $(id).addEventListener('input', upd); }); $('qt-dd-m').addEventListener('change', upd); upd(); }); })();<\/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\/calorie-calculator\/\">Calorie Calculator<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/body-fat-calculator\/\">Body Fat Calculator<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/water-intake-calculator\/\">Water Intake Calculator<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/ideal-weight-calculator\/\">Ideal Weight Calculator<\/a><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><\/div>\n<\/div>\n<p><strong>Quick answer:<\/strong> Your due date is usually 280 days (40 weeks) after the first day of your last menstrual period, or 266 days after conception. The calculator adjusts this if your cycles are longer or shorter than 28 days.<\/p>\n<h2>How to use the due date calculator<\/h2>\n<ol>\n<li>Choose what you know: the <strong>first day of your last period<\/strong>, the <strong>conception date<\/strong>, or an <strong>IVF transfer date<\/strong> for a day 3 or day 5 embryo.<\/li>\n<li>Pick the date. If you use your last period, enter your average cycle length too.<\/li>\n<li>Read your estimated due date, how many weeks and days pregnant you are today, your trimester and the days to go.<\/li>\n<li>Check the milestones table for the dates of key scans and stages.<\/li>\n<\/ol>\n<h2>How the due date is calculated<\/h2>\n<p>Doctors and midwives use <strong>Naegele&#8217;s rule<\/strong>: add one year, subtract three months and add seven days to the first day of your last period. That is the same as adding 280 days. Pregnancy is counted from the start of the last period, about two weeks before conception, which is why you are already &#8220;4 weeks pregnant&#8221; around the time a test turns positive.<\/p>\n<ul>\n<li><strong>Longer or shorter cycles:<\/strong> ovulation shifts, so the due date moves by the difference from 28 days.<\/li>\n<li><strong>Conception date:<\/strong> due date = conception + 266 days.<\/li>\n<li><strong>IVF:<\/strong> due date = transfer date + 263 days for a day 3 embryo, or + 261 days for a day 5 blastocyst.<\/li>\n<\/ul>\n<h2>Trimesters<\/h2>\n<table class=\"qt-ref\">\n<thead>\n<tr>\n<th>Trimester<\/th>\n<th>Weeks<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>First<\/td>\n<td>Week 1 to the end of week 13<\/td>\n<\/tr>\n<tr>\n<td>Second<\/td>\n<td>Week 14 to the end of week 27<\/td>\n<\/tr>\n<tr>\n<td>Third<\/td>\n<td>Week 28 until birth<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Is the due date exact?<\/h2>\n<p>No. It is an estimate. Only about 4 percent of babies are born on their due date, and a birth anywhere from 37 to 42 weeks is considered normal. An early ultrasound, especially between 8 and 13 weeks, measures the baby and is often used to confirm or adjust the date.<\/p>\n<p>This tool is for information only and does not replace advice from your doctor or midwife. Count the days with the <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/countdown-to-date\/\">countdown timer<\/a>, or work out exact dates with <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/days-between-dates\/\">days between dates<\/a>.<\/p>\n<h2>FAQ<\/h2>\n<h3>How many weeks pregnant am I?<\/h3>\n<p>The &#8220;Weeks pregnant today&#8221; box shows it in weeks and days, counted from your last period.<\/p>\n<h3>What if I don&#8217;t know my last period date?<\/h3>\n<p>Use the conception date if you know it, or ask for a dating scan. An early ultrasound gives the most reliable estimate.<\/p>\n<h2>More free tools<\/h2>\n<div class=\"qt-cards\"><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/calorie-calculator\/\"><strong>Calorie Calculator<\/strong><span>Daily calories (TDEE) and BMR for your goal.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/body-fat-calculator\/\"><strong>Body Fat Calculator<\/strong><span>Body fat percentage by the US Navy method.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/water-intake-calculator\/\"><strong>Water Intake Calculator<\/strong><span>How much water to drink each day.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/ideal-weight-calculator\/\"><strong>Ideal Weight Calculator<\/strong><span>Ideal body weight by height with four formulas.<\/span><\/a><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><\/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 due date calculator estimates when your baby is due and how far along you are today. Enter the first day of your last period, the date of conception or your IVF embryo transfer date, and see your estimated due date, current week of pregnancy, trimester and key milestones. Based onFirst day of last periodConception&#8230;<\/p>\n","protected":false},"author":4,"featured_media":66592,"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-65883","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65883","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=65883"}],"version-history":[{"count":3,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65883\/revisions"}],"predecessor-version":[{"id":66440,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65883\/revisions\/66440"}],"up":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65595"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/media\/66592"}],"wp:attachment":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/media?parent=65883"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}