{"id":57935,"date":"2016-02-05T11:34:20","date_gmt":"2016-02-05T09:34:20","guid":{"rendered":"http:\/\/wpcalc.com\/?p=57935"},"modified":"2026-10-23T10:09:56","modified_gmt":"2026-10-23T07:09:56","slug":"pregnancy-due-date","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/pregnancy-baby\/pregnancy-due-date\/","title":{"rendered":"Due Date Calculator \u2013 Pregnancy Due Date"},"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\">Estimate Your Baby\u2019s Expected Delivery Date<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"57935\" data-favorite-title=\"Pregnancy Due Date\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/pregnancy-baby\/pregnancy-due-date\/\" data-favorite-excerpt=\"Enter the first day of your last menstrual period and your usual cycle length to estimate your due date and conception date.\" 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-due-date\/\" method=\"POST\" class=\"calculator\" id=\"calculator-57935\" data-post=\"57935\"><fieldset class=\"fieldset-input\"><legend class=\"sr-only\">Input Fields<\/legend><div class=\"field\" id=\"input-1\"><label for=\"field-1\">First day of your last menstrual period (LMP)<\/label><input type=\"date\" name=\"first_day_of_your_last_menstrual_period_lmp\" id=\"field-1\" step=\"any\" value=\"2026-11-13\"\/><\/div><div class=\"field\" id=\"input-2\"><label for=\"field-2\">Cycle Length<\/label><div class=\"grid grid-cols-1\"><select id=\"field-2\" name=\"cycle_length\"><option value=\"20\">20<\/option><option value=\"21\">21<\/option><option value=\"22\">22<\/option><option value=\"23\">23<\/option><option value=\"24\">24<\/option><option value=\"25\">25<\/option><option value=\"26\">26<\/option><option value=\"27\">27<\/option><option value=\"28\">28<\/option><option value=\"29\">29<\/option><option value=\"30\">30<\/option><option value=\"31\">31<\/option><option value=\"32\">32<\/option><option value=\"33\">33<\/option><option value=\"34\">34<\/option><option value=\"35\">35<\/option><option value=\"36\">36<\/option><option value=\"37\">37<\/option><option value=\"38\">38<\/option><option value=\"39\">39<\/option><option value=\"40\">40<\/option><option value=\"41\">41<\/option><option value=\"42\">42<\/option><option value=\"43\">43<\/option><option value=\"44\">44<\/option><option value=\"45\">45<\/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><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Re-Calculate\" id=\"calculate-button\" data-post=\"57935\">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>Pregnancy Conception Date<\/span><span class=\"result-term\">conception<\/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>Expected Date of Delivery<\/span><span class=\"result-term\">edd<\/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><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=\"57935\" 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\">1<\/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>Pregnancy 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\\[ \\mathrm{EDD}=\\mathrm{LMP}+(280+C-28)\\text{ days} \\]\n\\[ \\mathrm{CD}=\\mathrm{LMP}+(C-14)\\text{ days} \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Where:<\/strong><\/p>\n<ul>\n<li>\\(\\mathrm{EDD}\\) \u2014 estimated date of delivery (due date)<\/li>\n<li>\\(\\mathrm{CD}\\) \u2014 estimated conception date<\/li>\n<li>\\(\\mathrm{LMP}\\) \u2014 first day of the last menstrual period<\/li>\n<li>\\(C\\) \u2014 usual menstrual cycle length in days<\/li>\n<\/ul>\n<p>For a 28-day cycle, the due date is 280 days after the LMP. The calculator adjusts both dates for the cycle length you select, assuming ovulation occurs about 14 days before the next period.<\/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>Pregnancy Due Date \u2013 Calculation Example<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Example:<\/strong> The first day of your last menstrual period was September 28, 2026, and your usual cycle length is 28 days.<\/p>\n<p>\\[ \\mathrm{CD}=\\text{September 28, 2026}+(28-14)\\text{ days}=\\text{October 12, 2026} \\]<\/p>\n<p>\\[ \\mathrm{EDD}=\\text{September 28, 2026}+(280+28-28)\\text{ days}=\\text{July 5, 2027} \\]<\/p>\n<p><strong>Result:<\/strong> The estimated conception date is October 12, 2026, and the expected date of delivery is July 5, 2027.<\/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 (LMP)<\/strong>, enter the date your most recent period began\u2014not the date it ended. Use the date before the pregnancy, even if you later had spotting.<\/li>\n<li>In <strong>Cycle Length<\/strong>, select the number of days in your usual menstrual cycle, counted from the first day of one period to the first day of the next. The available choices are 20 to 45 days.<\/li>\n<li>Read <strong>Pregnancy Conception Date<\/strong> for the estimated date of conception and <strong>Expected Date of Delivery<\/strong> for your estimated due date.<\/li>\n<\/ol>\n<p>If you are unsure of your cycle length, 28 days is a common starting assumption. Select 28 from the list rather than assuming it is already selected, and remember that an uncertain cycle length makes both estimates less precise.<\/p>\n<h2>What your pregnancy due date means<\/h2>\n<p>A pregnancy due date is an estimate, not a scheduled birth date. Pregnancy is conventionally dated from the first day of the last menstrual period, which is usually about two weeks before ovulation in a 28-day cycle. On that basis, 40 weeks of pregnancy equals 280 days from the LMP. Changing the cycle length shifts the estimated ovulation date and due date by the same number of days.<\/p>\n<p>The <strong>Pregnancy Conception Date<\/strong> result estimates when ovulation\u2014and possible fertilization\u2014occurred. It cannot identify the exact day conception happened. Ovulation may vary from cycle to cycle, and sperm can survive for several days before fertilization. The result is best read as a calendar estimate rather than confirmation of when pregnancy began.<\/p>\n<p>The <strong>Expected Date of Delivery<\/strong> provides a reference point for prenatal care and for interpreting how far along a pregnancy is. Many babies are born before or after their due date. If you want to follow the timeline in weeks and days, use the <a href=\"https:\/\/wpcalc.com\/en\/pregnancy-baby\/gestational-age\/\">Gestational Age Calculator<\/a> or <a href=\"https:\/\/wpcalc.com\/en\/pregnancy-baby\/how-many-weeks-pregnant\/\">How Many Weeks Pregnant Are You?<\/a> calculator.<\/p>\n<h2>Assumptions and practical limitations<\/h2>\n<p>The calculation assumes a fairly regular cycle and ovulation approximately 14 days before the next period. A longer selected cycle produces a later estimated conception date and due date; a shorter cycle produces earlier dates. Cycle length alone cannot reveal when ovulation actually happened, particularly if your periods are irregular.<\/p>\n<p>LMP-based dating may be less reliable if you do not know when your last period began, recently stopped hormonal contraception, have irregular bleeding, or conceived soon after a previous pregnancy. Bleeding in early pregnancy can also be mistaken for a period. If any of these apply, tell your healthcare professional what you know about your dates instead of relying on the calculator result alone.<\/p>\n<p>An early pregnancy ultrasound can help establish gestational age, especially when menstrual dates are uncertain. Its estimate may differ from this calculator\u2019s result. A healthcare professional can decide which due date to use for your medical record; do not change a date they have established solely because a later calculation differs. For an ultrasound-based estimate, see the <a href=\"https:\/\/wpcalc.com\/en\/pregnancy-baby\/ultrasound-gestation-period\/\">Ultrasound Gestation Period<\/a> calculator.<\/p>\n<h2>Using your estimate<\/h2>\n<p>Keep the LMP date, selected cycle length, and calculated due date together so you can explain how you arrived at the estimate during a prenatal visit. If you later learn that your usual cycle length differs from the value you entered, recalculate and discuss any meaningful difference with your healthcare professional.<\/p>\n<p>If you are comparing dates after fertility tracking, keep in mind that an estimated ovulation day and a known date of intercourse are not necessarily the same as the day of fertilization. The <a href=\"https:\/\/wpcalc.com\/en\/pregnancy-baby\/date-of-conception\/\">Date of Conception<\/a> calculator offers another way to explore conception timing. Neither estimate replaces clinical dating or confirms paternity.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Enter the first day of your last menstrual period and your usual cycle length to estimate your due date and conception date.<\/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-57935","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\/57935","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=57935"}],"version-history":[{"count":5,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/57935\/revisions"}],"predecessor-version":[{"id":67451,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/57935\/revisions\/67451"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=57935"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=57935"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=57935"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}