Pregnancy Due Date Calculator
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.input-group input[type="number"] {
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h1 {
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.btn-calculate {
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#result p {
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Pregnancy Due Date Calculator
Your Estimated Due Date:
—
Understanding Your Estimated Due Date
Estimating your baby's due date is a crucial part of your pregnancy journey. While it's an estimate and babies often arrive a little before or after, it provides a vital timeline for monitoring your pregnancy and preparing for your baby's arrival. The most common method for calculating a due date is by using the Last Menstrual Period (LMP).
How the Calculation Works (Naegele's Rule)
The standard method for estimating a due date is called Naegele's Rule. This rule assumes a typical 28-day menstrual cycle with ovulation occurring around day 14. The calculation is as follows:
- Step 1: Take the first day of your Last Menstrual Period (LMP).
- Step 2: Add 7 days to this date.
- Step 3: Subtract 3 months from the resulting date.
- Step 4: Add 1 year to the resulting date.
This effectively adds 40 weeks (280 days) from the LMP, which is the average length of a full-term pregnancy. For example, if your LMP was January 1st, 2023:
- Add 7 days: January 8th, 2023
- Subtract 3 months: October 8th, 2022
- Add 1 year: October 8th, 2023
- So, the estimated due date would be October 8th, 2023.
Using Gestational Age
This calculator also allows you to input your current gestational age in weeks and days if you know it (perhaps from an early ultrasound or doctor's assessment). The calculator will then add the remaining days until 40 weeks (280 days) to determine your due date.
- Total expected days in pregnancy: 280 days.
- If your current gestational age is 12 weeks and 3 days, the remaining days are: (280 total days) – (12 weeks * 7 days/week + 3 days) = 280 – (84 + 3) = 280 – 87 = 193 days.
- The calculator adds these remaining 193 days to your current date to estimate the due date.
Important Considerations
- Irregular Cycles: Naegele's Rule is most accurate for women with regular 28-day cycles. If your cycles are longer or shorter, your due date may be less precise.
- Ultrasound Accuracy: Early ultrasounds (especially in the first trimester) are often more accurate in dating a pregnancy than LMP alone, as fetal growth is more standardized in the early weeks.
- Individual Variation: Every pregnancy is unique. Only a small percentage of babies are actually born on their due date. It's common for babies to be born within a window of two weeks before or after the due date.
- Consult Your Doctor: Always confirm your due date with your healthcare provider. They will use a combination of your LMP, physical exams, and potentially ultrasound findings to give you the most accurate estimate.
function calculateDueDate() {
var lmpInput = document.getElementById("lastMenstrualPeriod");
var gestationalWeeksInput = document.getElementById("gestationalAgeWeeks");
var gestationalDaysInput = document.getElementById("gestationalAgeDays");
var dueDateDisplay = document.getElementById("dueDateDisplay");
var lmpValue = lmpInput.value;
var gestationalWeeks = parseInt(gestationalWeeksInput.value);
var gestationalDays = parseInt(gestationalDaysInput.value);
var dueDate = null;
if (lmpValue) {
var lmpDate = new Date(lmpValue);
if (!isNaN(lmpDate.getTime())) {
// Naegele's Rule: LMP + 7 days – 3 months + 1 year
var dateFromLMP = new Date(lmpDate);
dateFromLMP.setDate(dateFromLMP.getDate() + 7);
dateFromLMP.setMonth(dateFromLMP.getMonth() – 3);
dateFromLMP.setFullYear(dateFromLMP.getFullYear() + 1);
dueDate = dateFromLMP;
}
} else if (!isNaN(gestationalWeeks) && !isNaN(gestationalDays)) {
// Calculate based on current date and gestational age
var currentDate = new Date();
if (gestationalWeeks >= 0 && gestationalDays >= 0 && gestationalDays = 0) {
dueDate = new Date(currentDate);
dueDate.setDate(dueDate.getDate() + remainingDays);
} else {
dueDateDisplay.textContent = "Gestational age exceeds 40 weeks.";
return;
}
} else {
dueDateDisplay.textContent = "Please enter valid Gestational Age.";
return;
}
} else {
dueDateDisplay.textContent = "Please enter your LMP or Gestational Age.";
return;
}
if (dueDate && !isNaN(dueDate.getTime())) {
var options = { year: 'numeric', month: 'long', day: 'numeric' };
dueDateDisplay.textContent = dueDate.toLocaleDateString(undefined, options);
} else {
dueDateDisplay.textContent = "Invalid Input";
}
}