.conception-birth-calculator-container {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
max-width: 800px;
margin: 20px auto;
padding: 25px;
background-color: #f9f9f9;
border-radius: 10px;
box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
color: #333;
}
.conception-birth-calculator-container h2 {
color: #2c3e50;
text-align: center;
margin-bottom: 25px;
font-size: 1.8em;
}
.conception-birth-calculator-container h3 {
color: #34495e;
margin-top: 30px;
margin-bottom: 15px;
font-size: 1.4em;
border-bottom: 2px solid #e0e0e0;
padding-bottom: 8px;
}
.conception-birth-calculator-container .input-group {
margin-bottom: 18px;
display: flex;
flex-direction: column;
}
.conception-birth-calculator-container label {
margin-bottom: 8px;
font-weight: bold;
color: #555;
font-size: 1em;
}
.conception-birth-calculator-container input[type="date"] {
padding: 12px;
border: 1px solid #ccc;
border-radius: 6px;
font-size: 1em;
width: calc(100% – 24px);
box-sizing: border-box;
transition: border-color 0.3s ease;
}
.conception-birth-calculator-container input[type="date"]:focus {
border-color: #007bff;
outline: none;
box-shadow: 0 0 5px rgba(0, 123, 255, 0.3);
}
.conception-birth-calculator-container button {
background-color: #28a745;
color: white;
padding: 12px 25px;
border: none;
border-radius: 6px;
cursor: pointer;
font-size: 1.1em;
margin-top: 15px;
transition: background-color 0.3s ease, transform 0.2s ease;
width: auto;
align-self: flex-start;
}
.conception-birth-calculator-container button:hover {
background-color: #218838;
transform: translateY(-1px);
}
.conception-birth-calculator-container .result {
margin-top: 25px;
padding: 18px;
background-color: #e9f7ef;
border: 1px solid #d4edda;
border-radius: 8px;
font-size: 1.1em;
color: #155724;
line-height: 1.6;
}
.conception-birth-calculator-container .result p {
margin: 0 0 8px 0;
}
.conception-birth-calculator-container .result p:last-child {
margin-bottom: 0;
}
.conception-birth-calculator-container .error-message {
color: #dc3545;
margin-top: 10px;
font-weight: bold;
}
.conception-birth-calculator-container .calculator-section {
background-color: #ffffff;
padding: 20px;
border-radius: 8px;
box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
margin-bottom: 30px;
}
.conception-birth-calculator-container .calculator-section:last-of-type {
margin-bottom: 0;
}
.conception-birth-calculator-container .article-content {
margin-top: 40px;
line-height: 1.7;
color: #444;
font-size: 1em;
}
.conception-birth-calculator-container .article-content h4 {
color: #2c3e50;
margin-top: 25px;
margin-bottom: 10px;
font-size: 1.2em;
}
.conception-birth-calculator-container .article-content p {
margin-bottom: 15px;
}
.conception-birth-calculator-container .article-content ul {
list-style-type: disc;
margin-left: 20px;
margin-bottom: 15px;
}
.conception-birth-calculator-container .article-content li {
margin-bottom: 8px;
}
function formatDate(date) {
var d = new Date(date),
month = " + (d.getMonth() + 1),
day = " + d.getDate(),
year = d.getFullYear();
if (month.length < 2)
month = '0' + month;
if (day.length < 2)
day = '0' + day;
return [month, day, year].join('/');
}
function calculateFromLMP() {
var lmpDateStr = document.getElementById("lastMenstrualPeriodDate").value;
var resultDiv = document.getElementById("resultLMP");
resultDiv.style.display = 'none';
resultDiv.innerHTML = '';
if (!lmpDateStr) {
resultDiv.innerHTML = 'Please enter your Last Menstrual Period (LMP) date.';
resultDiv.style.display = 'block';
return;
}
var lmpDate = new Date(lmpDateStr + 'T00:00:00'); // Add T00:00:00 to ensure UTC interpretation for consistency
if (isNaN(lmpDate.getTime())) {
resultDiv.innerHTML = 'Please enter a valid date for LMP.';
resultDiv.style.display = 'block';
return;
}
// Calculate Estimated Due Date (EDD) – 280 days from LMP
var eddDate = new Date(lmpDate);
eddDate.setDate(lmpDate.getDate() + 280);
// Calculate Estimated Conception Date – approx 14 days from LMP
var conceptionDate = new Date(lmpDate);
conceptionDate.setDate(lmpDate.getDate() + 14);
resultDiv.innerHTML =
'Based on your LMP of ' + formatDate(lmpDate) + ':' +
'Estimated Due Date (EDD): ' + formatDate(eddDate) + '' +
'Estimated Conception Date: ' + formatDate(conceptionDate) + '' +
'(These are estimates. Consult your doctor for precise dating.)';
resultDiv.style.display = 'block';
}
function calculateFromEDD() {
var eddDateStr = document.getElementById("estimatedDueDateInput").value;
var resultDiv = document.getElementById("resultEDD");
resultDiv.style.display = 'none';
resultDiv.innerHTML = ";
if (!eddDateStr) {
resultDiv.innerHTML = 'Please enter your Estimated Due Date (EDD).';
resultDiv.style.display = 'block';
return;
}
var eddDate = new Date(eddDateStr + 'T00:00:00'); // Add T00:00:00 to ensure UTC interpretation for consistency
if (isNaN(eddDate.getTime())) {
resultDiv.innerHTML = 'Please enter a valid date for EDD.';
resultDiv.style.display = 'block';
return;
}
// Calculate Estimated Conception Date – 266 days before EDD
var conceptionDate = new Date(eddDate);
conceptionDate.setDate(eddDate.getDate() – 266);
// Calculate Estimated Last Menstrual Period (LMP) – 280 days before EDD
var lmpDate = new Date(eddDate);
lmpDate.setDate(eddDate.getDate() – 280);
resultDiv.innerHTML =
'Based on your EDD of ' + formatDate(eddDate) + ':' +
'Estimated Conception Date: ' + formatDate(conceptionDate) + '' +
'Estimated Last Menstrual Period (LMP): ' + formatDate(lmpDate) + '' +
'(These are estimates. Consult your doctor for precise dating.)';
resultDiv.style.display = 'block';
}
Conception and Birth Date Calculator
Calculate from Last Menstrual Period (LMP)
Calculate from Estimated Due Date (EDD)
Understanding Your Pregnancy Timeline
The journey of pregnancy is an exciting time, and knowing your estimated due date (EDD) and approximate conception date can help you plan and prepare. While only a healthcare professional can provide definitive dates, this calculator offers a helpful estimate based on common medical guidelines.
How Pregnancy Dates Are Calculated
Pregnancy is typically measured from the first day of your Last Menstrual Period (LMP), even though conception usually occurs about two weeks later. This method is known as Naegele's Rule and assumes a 28-day menstrual cycle with ovulation occurring on day 14.
- Estimated Due Date (EDD) from LMP: The standard calculation adds 280 days (40 weeks) to the first day of your LMP.
- Estimated Conception Date from LMP: Conception is generally assumed to occur around 14 days after the first day of your LMP.
- Estimated Due Date from Conception Date: If you know your exact conception date, the EDD is typically 266 days (38 weeks) from that date.
- Estimated Conception Date from EDD: To work backward from an EDD, subtract 266 days (38 weeks) to find the approximate conception date, or subtract 280 days (40 weeks) to find the approximate LMP.
Factors Affecting Accuracy
While these calculations provide a good starting point, several factors can influence their accuracy:
- Irregular Menstrual Cycles: Naegele's Rule assumes a regular 28-day cycle. If your cycles are longer or shorter, or irregular, the LMP-based calculation may be less accurate.
- Ovulation Timing: Not everyone ovulates on day 14. Early or late ovulation will shift the actual conception date.
- Early Ultrasound: An early ultrasound (typically between 8-12 weeks) is often considered the most accurate method for dating a pregnancy, as it measures the size of the embryo/fetus.
- Multiple Pregnancies: While the calculation method remains the same, multiple pregnancies might have different growth patterns.
Why These Dates Matter
Knowing your estimated due date helps healthcare providers monitor your baby's development, schedule important screenings and tests, and plan for delivery. It also gives expectant parents a timeline for preparing for their new arrival.
Important Note
This calculator provides estimates for informational purposes only. It is not a substitute for professional medical advice. Always consult with your doctor or healthcare provider for accurate dating of your pregnancy and personalized care.
Example Scenarios:
Scenario 1: Calculating from LMP
If your Last Menstrual Period (LMP) started on January 1, 2024:
- Estimated Conception Date: January 1 + 14 days = January 15, 2024
- Estimated Due Date: January 1 + 280 days = October 8, 2024
Scenario 2: Calculating from EDD
If your Estimated Due Date (EDD) is October 8, 2024:
- Estimated Conception Date: October 8 – 266 days = January 15, 2024
- Estimated Last Menstrual Period (LMP): October 8 – 280 days = January 1, 2024