.pregnancy-calculator-container {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
max-width: 700px;
margin: 20px auto;
padding: 25px;
border: 1px solid #e0e0e0;
border-radius: 10px;
background-color: #fdfdfd;
box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
color: #333;
}
.pregnancy-calculator-container h2 {
text-align: center;
color: #2c3e50;
margin-bottom: 25px;
font-size: 1.8em;
}
.pregnancy-calculator-container label {
display: block;
margin-bottom: 8px;
font-weight: bold;
color: #555;
font-size: 0.95em;
}
.pregnancy-calculator-container input[type="date"] {
width: calc(100% – 22px);
padding: 12px;
margin-bottom: 20px;
border: 1px solid #ccc;
border-radius: 6px;
font-size: 1em;
box-sizing: border-box;
transition: border-color 0.3s ease;
}
.pregnancy-calculator-container input[type="date"]:focus {
border-color: #007bff;
outline: none;
box-shadow: 0 0 5px rgba(0, 123, 255, 0.2);
}
.pregnancy-calculator-container button {
display: block;
width: 100%;
padding: 14px 20px;
background-color: #28a745;
color: white;
border: none;
border-radius: 6px;
font-size: 1.1em;
font-weight: bold;
cursor: pointer;
transition: background-color 0.3s ease, transform 0.2s ease;
margin-top: 15px;
}
.pregnancy-calculator-container button:hover {
background-color: #218838;
transform: translateY(-1px);
}
.pregnancy-calculator-container button:active {
transform: translateY(0);
}
.pregnancy-calculator-container #pregnancyResult {
margin-top: 30px;
padding: 20px;
border: 1px solid #d4edda;
background-color: #e9f7ef;
border-radius: 8px;
font-size: 1.1em;
line-height: 1.6;
color: #155724;
display: none; /* Hidden by default */
}
.pregnancy-calculator-container #pregnancyResult p {
margin: 0 0 10px 0;
}
.pregnancy-calculator-container #pregnancyResult p:last-child {
margin-bottom: 0;
}
.pregnancy-calculator-container .input-group {
margin-bottom: 25px;
padding: 15px;
border: 1px solid #e9ecef;
border-radius: 8px;
background-color: #f8f9fa;
}
.pregnancy-calculator-container .input-group h3 {
margin-top: 0;
color: #007bff;
font-size: 1.2em;
margin-bottom: 15px;
}
.pregnancy-calculator-container .or-divider {
text-align: center;
margin: 20px 0;
font-weight: bold;
color: #6c757d;
position: relative;
}
.pregnancy-calculator-container .or-divider::before,
.pregnancy-calculator-container .or-divider::after {
content: ";
position: absolute;
top: 50%;
width: 40%;
height: 1px;
background-color: #dee2e6;
}
.pregnancy-calculator-container .or-divider::before {
left: 0;
}
.pregnancy-calculator-container .or-divider::after {
right: 0;
}
.pregnancy-calculator-container .error-message {
color: #dc3545;
font-weight: bold;
margin-top: 10px;
text-align: center;
}
function calculatePregnancy() {
var lmpDateInput = document.getElementById("lmpDate").value;
var eddDateInput = document.getElementById("eddDate").value;
var resultDiv = document.getElementById("pregnancyResult");
resultDiv.style.display = "none"; // Hide previous results
resultDiv.innerHTML = ""; // Clear previous results
var lmpDate = new Date(lmpDateInput);
var eddDate = new Date(eddDateInput);
var today = new Date();
today.setHours(0, 0, 0, 0); // Normalize today's date to midnight
var currentWeeks, daysIntoWeek, calculatedEDD, calculatedLMP, daysRemaining;
var errorMessage = "";
// Prioritize LMP if provided and valid
if (lmpDateInput && !isNaN(lmpDate.getTime())) {
// Check if LMP is in the future or too far in the past
if (lmpDate.getTime() > today.getTime()) {
errorMessage = "LMP date cannot be in the future.";
} else if ((today.getTime() – lmpDate.getTime()) / (1000 * 60 * 60 * 24) > 300) { // More than ~42 weeks
errorMessage = "LMP date seems too far in the past for a current pregnancy.";
} else {
var diffMs = today.getTime() – lmpDate.getTime();
var diffDays = Math.floor(diffMs / (1000 * 60 * 60 * 24));
currentWeeks = Math.floor(diffDays / 7);
daysIntoWeek = diffDays % 7;
calculatedEDD = new Date(lmpDate.getTime() + (280 * 24 * 60 * 60 * 1000));
daysRemaining = Math.ceil((calculatedEDD.getTime() – today.getTime()) / (1000 * 60 * 60 * 24));
calculatedLMP = lmpDate; // LMP is the input
}
} else if (eddDateInput && !isNaN(eddDate.getTime())) {
// Check if EDD is too far in the past or future
if (eddDate.getTime() today.getTime() + (280 * 24 * 60 * 60 * 1000)) { // EDD more than 40 weeks in future
errorMessage = "EDD date seems too far in the future.";
} else {
var totalDaysToEDD = Math.floor((eddDate.getTime() – today.getTime()) / (1000 * 60 * 60 * 24));
var currentDaysPregnant = 280 – totalDaysToEDD;
currentWeeks = Math.floor(currentDaysPregnant / 7);
daysIntoWeek = currentDaysPregnant % 7;
calculatedLMP = new Date(eddDate.getTime() – (280 * 24 * 60 * 60 * 1000));
daysRemaining = Math.ceil((eddDate.getTime() – today.getTime()) / (1000 * 60 * 60 * 24));
calculatedEDD = eddDate; // EDD is the input
}
} else {
errorMessage = "Please enter either your Last Menstrual Period (LMP) or your Estimated Due Date (EDD).";
}
if (errorMessage) {
resultDiv.innerHTML = " + errorMessage + ";
resultDiv.style.display = "block";
return;
}
// Display results
var resultHtml = "";
resultHtml += "Current Pregnancy Status:";
resultHtml += "You are approximately " + currentWeeks + " weeks and " + daysIntoWeek + " days pregnant.";
resultHtml += "Your estimated due date (EDD) is: " + calculatedEDD.toLocaleDateString('en-US', { year: 'numeric', month: 'long', day: 'numeric' }) + "";
resultHtml += "Your estimated Last Menstrual Period (LMP) was: " + calculatedLMP.toLocaleDateString('en-US', { year: 'numeric', month: 'long', day: 'numeric' }) + "";
if (daysRemaining > 0) {
resultHtml += "You have approximately " + daysRemaining + " days remaining until your estimated due date.";
} else if (daysRemaining === 0) {
resultHtml += "Your estimated due date is today! Congratulations!";
} else {
resultHtml += "Your baby is estimated to be " + Math.abs(daysRemaining) + " days overdue. Please consult your healthcare provider.";
}
resultDiv.innerHTML = resultHtml;
resultDiv.style.display = "block";
}
Pregnancy Week by Week Calculator
Use this calculator to determine your current week of pregnancy, estimated due date, and other key milestones. You can calculate based on your Last Menstrual Period (LMP) or your Estimated Due Date (EDD).
Calculate by Last Menstrual Period (LMP)
OR
Calculate by Estimated Due Date (EDD)
Understanding Your Pregnancy Week by Week
Pregnancy is a remarkable journey, typically lasting around 40 weeks, or 280 days, from the first day of your last menstrual period (LMP). This calculator helps you track your progress by providing an estimate of your current week of pregnancy and your estimated due date (EDD).
How Pregnancy Weeks Are Counted
Even though conception usually occurs around two weeks after your LMP, pregnancy is traditionally counted from the first day of your last menstrual period. This is because the LMP provides a more reliable and easily identifiable starting point than the exact moment of conception.
- First Trimester (Weeks 1-13): This period marks rapid development, including the formation of major organs. Many women experience morning sickness and fatigue during this time.
- Second Trimester (Weeks 14-27): Often considered the "golden trimester," as many early pregnancy symptoms subside. The baby grows significantly, and you might start to feel the first movements (quickening).
- Third Trimester (Weeks 28-40+): The final stretch, where the baby continues to grow and mature, preparing for birth. You might experience more discomfort as your body prepares for labor.
Calculating Your Due Date
The most common method for calculating your due date is Naegele's Rule. This rule adds 280 days (40 weeks) to the first day of your LMP. Our calculator uses this principle to give you an accurate estimate.
If you know your estimated due date from an early ultrasound or your doctor, you can also use that to work backward and determine your current week of pregnancy and estimated LMP.
Why is Tracking Important?
Knowing your current week of pregnancy helps you:
- Understand your baby's developmental milestones.
- Prepare for upcoming appointments and screenings.
- Anticipate changes in your body and symptoms.
- Plan for the arrival of your baby.
While this calculator provides a helpful estimate, remember that it's an approximation. Only about 5% of babies are born exactly on their due date. Most babies arrive between 37 and 42 weeks of gestation. Always consult with your healthcare provider for personalized advice and accurate medical information regarding your pregnancy.