Estimate length of your pregnancy with pregnancy calculator

DISCLAIMER: The Pregnancy Calculator below is an estimation of weeks from reported last normal menstrual period and does not constitute medical advice. A missed period does not necessarily mean that you are pregnant, and having a period does not mean you are not pregnant. Only an exam, pregnancy test, or ultrasound by a physician can confirm pregnancy and approximate length of pregnancy. The calculator should be used as a guide only and should not be relied upon for weeks of pregnancy, conception date, or due date.

To estimate the length of your pregnancy, enter the first day of your last period and then press 'calculate'.

"; } function calBody(d,day) { var s="", dayCount=1, fd=firstDay(d), ld=lastDay(d); if (weekDay > 0 && fd == 0) { fd = 7; } for (var i=0; i<6; i++) { s+=""; for (var j=weekDay; jld) { s+=""+span1("day")+" "+span2+""; } else { var bgColor=dayColor; var fgTag="day"; var fgTagA="daya"; if (dayCount==day) { bgColor=currentDayColor; fgTag="currentDay"; fgTagA="currenta"; } s+=""+span1(fgTag)+a1(fgTagA)+"'javascript: if (window.opener && !window.opener.closed && window.opener.pickDate) window.opener.pickDate("+dayCount+")'>"+(dayCount++)+""+span2+""; } } s+=""; } return s; } function moveYear(dy) { cY+=dy; var nd=new Date(cY,cM,1); changeCal(nd); } function prepMonth(m) { cM=m-1; if (cM<0) { cM=11; cY--; } var nd=new Date(cY,cM,1); changeCal(nd); } function nextMonth(m) { cM=m+1; if (cM>11) { cM=0; cY++;} var nd=new Date(cY,cM,1); changeCal(nd); } function changeCal(d) { var dd = 0; if (currentCal != null) { var calRE = getFormat(); if (currentCal.form[currentCal.field].value!="" && calRE.test(currentCal.form[currentCal.field].value)) { var cd = getDateNumbers(currentCal.form[currentCal.field].value); if (cd[0] == d.getFullYear() && cd[1] == d.getMonth()) { dd=cd[2]; } } else { var cd = new Date(); if (cd.getFullYear() == d.getFullYear() && cd.getMonth() == d.getMonth()) { dd=cd.getDate(); } } } var calendar=calHeader()+calTitle(d)+calBody(d,dd)+calFooter(); calWin.document.open(); calWin.document.write(calendar); calWin.document.close(); } function markClick(e) { if (isIE || isOpera6) { winX=event.screenX; winY=event.screenY; } else if (isN4 || isN6) { winX=e.screenX; winY=e.screenY; document.routeEvent(e); } if (isN4 || isN6) { document.routeEvent(e); } else { event.cancelBubble=false; } return true; } function showCal(name) { var lastCal=currentCal; var d=new Date(), hasCal=false; currentCal = findCalendar(name); if (currentCal != null && currentCal.form != null && currentCal.form[currentCal.field]) { var calRE = getFormat(); if (currentCal.form[currentCal.field].value!="" && calRE.test(currentCal.form[currentCal.field].value)) { var cd = getDateNumbers(currentCal.form[currentCal.field].value); d=new Date(cd[0],cd[1],cd[2]); cY=cd[0]; cM=cd[1]; dd=cd[2]; } else { cY=d.getFullYear(); cM=d.getMonth(); dd=d.getDate(); } var calendar=calHeader()+calTitle(d)+calBody(d,dd)+calFooter(); if (calWin != null && typeof(calWin.closed)!="undefined" && !calWin.closed) { hasCal=true; calWin.moveTo(winX+calOffsetX,winY+calOffsetY); } if (!hasCal) { if (isIE || isOpera6) { calWin=window.open("","cal","toolbar=0,width="+calWidth+",height="+calHeight+",left="+(winX+calOffsetX)+",top="+(winY+calOffsetY)); } else { calWin=window.open("","cal","toolbar=0,width="+calWidth+",height="+calHeight+",screenx="+(winX+calOffsetX)+",screeny="+(winY+calOffsetY)); } } calWin.document.open(); calWin.document.write(calendar); calWin.document.close(); calWin.focus(); } else { if (currentCal == null) { window.status = "Calendar ["+name+"] not found."; } else if (!currentCal.form) { window.status = "Form ["+currentCal.formName+"] not found."; } else if (!currentCal.form[currentCal.field]) { window.status = "Form Field ["+currentCal.formName+"."+currentCal.field+"] not found."; } if (lastCal != null) { currentCal = lastCal; } } } function get2Digits(n) { return ((n<10)?"0":"")+n; } function clearDate() { currentCal.form[currentCal.field].value=""; hideCal(); } function pickDate(d) { hideCal(); window.focus(); var date=calFormat; date = date.replace(/yyyy/i, cY); date = date.replace(/mm/i, get2Digits(cM+1)); date = date.replace(/MON/, yxMonths[cM].substring(0,3).toUpperCase()); date = date.replace(/Mon/i, yxMonths[cM].substring(0,3)); date = date.replace(/dd/i, get2Digits(d)); date = date.replace(/DAY/, getDayName(cY,cM,d).toUpperCase()); date = date.replace(/day/i, getDayName(cY,cM,d)); currentCal.form[currentCal.field].value=date; // IE5/Mac needs focus to show the value, weird. currentCal.form[currentCal.field].focus(); } // ------ // user functions function checkDate(name) { var thisCal = findCalendar(name); if (thisCal != null && thisCal.form != null && thisCal.form[thisCal.field]) { var calRE = getFormat(); if (calRE.test(thisCal.form[thisCal.field].value)) { return 0; } else { return 1; } } else { return 2; } } function getCurrentDate() { var date=calFormat, d = new Date(); date = date.replace(/yyyy/i, d.getFullYear()); date = date.replace(/mm/i, get2Digits(d.getMonth()+1)); date = date.replace(/dd/i, get2Digits(d.getDate())); return date; } function compareDates(date1, date2) { var calRE = getFormat(); var d1, d2; if (calRE.test(date1)) { d1 = getNumbers(date1); } else { d1 = getNumbers(getCurrentDate()); } if (calRE.test(date2)) { d2 = getNumbers(date2); } else { d2 = getNumbers(getCurrentDate()); } var dStr1 = d1[0] + "" + d1[1] + "" + d1[2]; var dStr2 = d2[0] + "" + d2[1] + "" + d2[2]; if (dStr1 == dStr2) { return 0; } else if (dStr1 > dStr2) { return 1; } else { return -1; } } function getNumbers(date) { var calRE = getFormat(); var y, m, d; if (calRE.test(date)) { var yIdx = calFormat.search(/yyyy/i); var mIdx = calFormat.search(/mm/i); var m3Idx = calFormat.search(/mon/i); var dIdx = calFormat.search(/dd/i); y=date.substring(yIdx,yIdx+4); if (mIdx != -1) { m=date.substring(mIdx,mIdx+2); } else { var mm=getMonthFromName(date.substring(m3Idx,m3Idx+3))+1; m=(mm<10)?("0"+mm):(""+mm); } d=date.substring(dIdx,dIdx+2); return new Array(y,m,d); } else { return new Array("", "", ""); } } // ------ if (isN4 || isN6) { document.captureEvents(Event.CLICK); } document.onclick=markClick; //Define calendar(s): addCalendar ("Unique Calendar Name", "Window title", "Form element's name", Form name") addCalendar("Calendar1", "Select Date", "menstrual", "pregform"); // default settings for English // Uncomment desired lines and modify its values // setFont("verdana", 9); setWidth(90, 1, 15, 1); // setColor("#cccccc", "#cccccc", "#ffffff", "#ffffff", "#333333", "#cccccc", "#333333"); // setFontColor("#333333", "#333333", "#333333", "#ffffff", "#333333"); setFormat("mm/dd/yyyy"); // setSize(200, 200, -200, 16); // setWeekDay(0); // setMonthNames("January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"); // setDayNames("Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"); // setLinkNames("[Close]", "[Clear]");

First Day of Last Menstrual Period:	Select Date
Estimated Length of Pregnancy:
Estimated Conception Date:
Estimated Due Date: