{"id":57933,"date":"2016-02-05T11:16:12","date_gmt":"2016-02-05T09:16:12","guid":{"rendered":"http:\/\/wpcalc.com\/?p=57933"},"modified":"2026-09-28T13:52:31","modified_gmt":"2026-09-28T10:52:31","slug":"pregnancy","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/pregnancy-baby\/pregnancy\/","title":{"rendered":"Find Due Date 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 id=\"calculator-title\" class=\"text-lg font-display font-bold\">Pregnancy Due Date and Milestone Estimator<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"57933\" data-favorite-title=\"Find Your Due Date\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/pregnancy-baby\/pregnancy\/\" data-favorite-excerpt=\"Enter the first day of your last menstrual period to estimate your due date, conception date, fertility dates, and 12- and 27-week pregnancy milestones.\" aria-label=\"Add to Favorites\" data-favorite-icon=\"icon icon-embryo\">\n    <span class=\"icon icon-shape-star-empty\" aria-hidden=\"true\"><\/span>\n  <\/button>\n  <div class=\"calcdash-favorite__tip\" aria-hidden=\"true\">\n   <span class=\"favorite-tooltip\" id=\"favorite-tooltip\"><\/span>\n  <\/div>\n  <span class=\"sr-only\" role=\"status\" id=\"favorite-status\"><\/span>\n<\/div><\/div><form action=\"https:\/\/wpcalc.com\/en\/pregnancy-baby\/pregnancy\/\" method=\"POST\" class=\"calculator\" id=\"calculator-57933\" data-post=\"57933\"><fieldset class=\"fieldset-input is-1\"><legend class=\"sr-only\">Input Fields<\/legend><div class=\"field\" id=\"input-1\"><label for=\"field-1\">First day of your last menstrual period<\/label><input type=\"date\" name=\"first_day_of_your_last_menstrual_period\" id=\"field-1\" step=\"any\" value=\"2026-11-12\"\/><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Re-Calculate\" id=\"calculate-button\" data-post=\"57933\">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>Estimated Fertility Dates<\/span><span class=\"result-term\">fertile<\/span><\/span><span class=\"field-value\" id=\"result-1\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-2\"><span class=\"field-title\"><span>Estimated Conception Date<\/span><span class=\"result-term\">conception<\/span><\/span><span class=\"field-value\" id=\"result-2\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-3\"><span class=\"field-title\"><span>First Trimester Ends (12 Weeks)<\/span><span class=\"result-term\">trimester1<\/span><\/span><span class=\"field-value\" id=\"result-3\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-4\"><span class=\"field-title\"><span>Second Trimester Ends (27 Weeks)<\/span><span class=\"result-term\">trimester2<\/span><\/span><span class=\"field-value\" id=\"result-4\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-5\"><span class=\"field-title\"><span>Estimated Due Date (40 Weeks)<\/span><span class=\"result-term\">duedate<\/span><\/span><span class=\"field-value\" id=\"result-5\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><\/div><div class=\"result-actions\"><button type=\"button\" class=\"copy-link\"><svg viewBox=\"0 0 20 20\" fill=\"currentColor\" aria-hidden=\"true\"><path d=\"M12.232 4.232a2.5 2.5 0 0 1 3.536 3.536l-1.225 1.224a.75.75 0 0 0 1.061 1.06l1.224-1.224a4 4 0 0 0-5.656-5.656l-3 3a4 4 0 0 0 .225 5.865.75.75 0 0 0 .977-1.138 2.5 2.5 0 0 1-.142-3.667l3-3Z\"\/><path d=\"M11.603 7.963a.75.75 0 0 0-.977 1.138 2.5 2.5 0 0 1 .142 3.667l-3 3a2.5 2.5 0 0 1-3.536-3.536l1.225-1.224a.75.75 0 0 0-1.061-1.06l-1.224 1.224a4 4 0 1 0 5.656 5.656l3-3a4 4 0 0 0-.225-5.865Z\"\/><\/svg><span class=\"copy-link__text\">Copy link to this calculation<\/span><\/button><span class=\"sr-only\" role=\"status\" id=\"copy-link-status\"><\/span><\/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=\"57933\" aria-live=\"polite\" aria-labelledby=\"calc-reactions-title\"><p id=\"calc-reactions-title\" class=\"text-sm text-gray-500 text-center mb-2\">How did this result make you feel?<\/p><div role=\"group\" aria-labelledby=\"calc-reactions-title\" class=\"grid grid-cols-3 sm:flex sm:flex-row sm:justify-around gap-4 sm:items-center sm:flex-wrap\"><button type=\"button\" aria-pressed=\"false\" 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\" aria-hidden=\"true\">\ud83d\ude00 <\/span><span class=\"reaction-description font-medium\">Like <\/span><\/button><button type=\"button\" aria-pressed=\"false\" 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\" aria-hidden=\"true\">\ud83d\udca1 <\/span><span class=\"reaction-description font-medium\">Helpful <\/span><\/button><button type=\"button\" aria-pressed=\"false\" 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\" aria-hidden=\"true\">\ud83d\ude15 <\/span><span class=\"reaction-description font-medium\">Confused <\/span><\/button><button type=\"button\" aria-pressed=\"false\" 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\" aria-hidden=\"true\">\ud83d\ude1e <\/span><span class=\"reaction-description font-medium\">Disappointed <\/span><\/button><button type=\"button\" aria-pressed=\"false\" 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\" aria-hidden=\"true\">\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><div class=\"calcdash-ad not-prose calcdash-ad--calc_result calcdash-ad--in-article\"><ins class=\"adsbygoogle\" style=\"display:block\" data-ad-client=\"ca-pub-1721569815777345\" data-ad-slot=\"6317458308\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\"><\/ins><script>(adsbygoogle = window.adsbygoogle || []).push({});<\/script><\/div>\n<style id=\"wpcoderpro-inline-1\">.formula-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><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>Find Your Due Date Formula<\/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\\[\\begin{aligned}\n\\text{Estimated fertility dates} &amp;= \\text{LMP} + 10\\text{ to }17\\text{ days} \\\\\n\\text{Estimated conception date} &amp;= \\text{LMP} + 14\\text{ days} \\\\\n\\text{First trimester ends (12 weeks)} &amp;= \\text{LMP} + 84\\text{ days} \\\\\n\\text{Second trimester ends (27 weeks)} &amp;= \\text{LMP} + 189\\text{ days} \\\\\n\\text{Estimated due date (40 weeks)} &amp;= \\text{LMP} + 280\\text{ days}\n\\end{aligned}\\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Where:<\/strong><\/p>\n<ul>\n<li>\\(\\text{LMP}\\) \u2014 the first day of your last menstrual period.<\/li>\n<li>\\(\\text{days}\\) \u2014 calendar days added to the LMP date.<\/li>\n<\/ul>\n<p>The calculator uses fixed offsets based on a typical 28-day menstrual cycle. It does not adjust its dates for your individual cycle length or the date you actually ovulated.<\/p>\n<p>\r\n<\/section>\n<style id=\"wpcoderpro-inline-459\">.calculation-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section id=\"calculation\" class=\"calculation-box\" aria-labelledby=\"calculation-title\">\r\n\t<div id=\"calculation-title\" class=\"not-prose font-display\"><span class=\"icon icon-unordered-list\" aria-hidden=\"true\"><\/span><h2>Find Your Due Date \u2013 Calculation Example<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Example:<\/strong> If the first day of your last menstrual period was September 28, 2026, add the calculator\u2019s fixed number of days for each milestone.<\/p>\n<p>\\[\\begin{aligned}<br \/>\n\\text{Fertility dates: }&amp;\\text{September 28} + 10\\text{ to }17\\text{ days} = \\text{October 8\u201315, 2026} \\\\<br \/>\n\\text{Conception: }&amp;\\text{September 28} + 14\\text{ days} = \\text{October 12, 2026} \\\\<br \/>\n\\text{12 weeks: }&amp;\\text{September 28} + 84\\text{ days} = \\text{December 21, 2026} \\\\<br \/>\n\\text{27 weeks: }&amp;\\text{September 28} + 189\\text{ days} = \\text{April 5, 2027} \\\\<br \/>\n\\text{40 weeks: }&amp;\\text{September 28} + 280\\text{ days} = \\text{July 5, 2027}<br \/>\n\\end{aligned}\\]<\/p>\n<p><strong>Result:<\/strong> The estimated due date is July 5, 2027. The other dates are estimates based on the same September 28 LMP.<\/p>\n<p>\n\r\n<\/section>\n<h2>How to use the calculator<\/h2>\n<ol>\n<li>In <strong>First day of your last menstrual period<\/strong>, select the date your most recent menstrual bleeding began\u2014not the date it ended. The field may initially show today\u2019s date, so change it if necessary.<\/li>\n<li>Read <strong>Estimated Fertility Dates<\/strong> as a date range and <strong>Estimated Conception Date<\/strong> as a single estimated date.<\/li>\n<li>Check <strong>First Trimester Ends (12 Weeks)<\/strong>, <strong>Second Trimester Ends (27 Weeks)<\/strong>, and <strong>Estimated Due Date (40 Weeks)<\/strong> for the remaining milestones.<\/li>\n<\/ol>\n<p>The dates appear in your device\u2019s local date format. For a more detailed look at pregnancy timing, see the <a href=\"https:\/\/wpcalc.com\/en\/pregnancy-baby\/gestational-age\/\">Gestational Age Calculator<\/a>.<\/p>\n<h2>What your estimated due date means<\/h2>\n<p>Pregnancy is commonly dated from the first day of the last menstrual period, even though conception usually happens later. On this method, an estimated due date is 40 weeks, or 280 days, after that first day. It is a planning estimate, not a prediction that labor will start on a particular date. Many babies are born before or after their estimated due date.<\/p>\n<p>The conception estimate assumes ovulation around 14 days after the period began. The fertility range runs from day 10 through day 17 after the LMP date. These are broad calendar estimates: sperm can survive for several days, while the timing of ovulation differs between people and can vary from one cycle to another. The displayed conception date cannot establish when conception actually occurred. If you want to explore cycle timing separately, use the <a href=\"https:\/\/wpcalc.com\/en\/pregnancy-baby\/fertility-ovulation-calendar-2\/\">Calendar of Ovulation and Fertility<\/a>.<\/p>\n<p>The 12- and 27-week results mark the exact gestational ages named in their labels. Trimester boundaries are described differently by different sources, so these dates should be read as calculator milestones rather than universal clinical cutoffs. Your prenatal care team may use different wording or revise your pregnancy dating. The <a href=\"https:\/\/wpcalc.com\/en\/pregnancy-baby\/how-many-weeks-pregnant\/\">How Many Weeks Pregnant Are You?<\/a> calculator can help you check an LMP-based week count for a particular day.<\/p>\n<h2>Assumptions and practical limitations<\/h2>\n<ul>\n<li><strong>Cycle length is fixed in the calculation.<\/strong> There is no cycle-length input. If your cycles are shorter or longer than 28 days, or ovulation happened earlier or later than assumed, the fertility, conception, and due-date estimates may be off.<\/li>\n<li><strong>The LMP needs to be reliable.<\/strong> If you are unsure when your last period started, have irregular bleeding, or became pregnant soon after stopping hormonal contraception, an LMP-based date may be less useful.<\/li>\n<li><strong>Clinical dating may differ.<\/strong> A clinician may use an early ultrasound and your medical history to confirm or revise the estimated due date. Follow the date used by your prenatal care team when planning care.<\/li>\n<li><strong>Fertility dates are not birth-control advice.<\/strong> Do not use this range to decide which days are safe for unprotected sex. Calendar estimates cannot reliably identify or exclude fertile days for an individual cycle.<\/li>\n<\/ul>\n<p>If you have a positive pregnancy test or questions about your dates, discuss the estimate with a healthcare professional. The calculator provides a starting point for understanding a pregnancy timeline; it cannot confirm pregnancy, determine the exact conception date, or replace prenatal assessment.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Enter the first day of your last menstrual period to estimate your due date, conception date, fertility dates, and 12- and 27-week pregnancy milestones.<\/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":[45],"tags":[47],"class_list":["post-57933","post","type-post","status-publish","format-standard","hentry","category-pregnancy-baby","tag-pregnancy-tracking"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/57933","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=57933"}],"version-history":[{"count":4,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/57933\/revisions"}],"predecessor-version":[{"id":65382,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/57933\/revisions\/65382"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=57933"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=57933"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=57933"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}