Track your healthy weight gain during pregnancy based on your BMI.
Pregnancy Weight Gain Calculator
Enter the current week of your pregnancy (1-40).
Your Body Mass Index before pregnancy (e.g., 18.5 – 24.9 for normal weight).
Your Pregnancy Weight Gain Status
Enter your gestational week and pre-pregnancy BMI to see recommended weight gain ranges.
Recommended Range (Total):
Current Gain Status:
Recommended Gain This Week:
Recommended Pregnancy Weight Gain by BMI Category
BMI Category
BMI Range
Total Recommended Gain (lbs)
Recommended Weekly Gain (2nd & 3rd Trimester)
Underweight
< 18.5
28–40 lbs
About 1 lb/week
Normal Weight
18.5–24.9
25–35 lbs
About 1 lb/week
Overweight
25.0–29.9
15–25 lbs
About 0.6 lb/week
Obese
≥ 30.0
11–20 lbs
About 0.5 lb/week
Pregnancy Weight Gain Progress
What is Pregnancy Weight Gain Calculator Chart?
The pregnancy weight gain calculator chart is a vital tool designed to help expectant mothers and their healthcare providers monitor and manage appropriate weight gain throughout pregnancy. Pregnancy weight gain is a critical factor influencing both maternal and fetal health. Gaining too little weight can increase the risk of preterm birth and low birth weight, while gaining too much weight can lead to complications such as gestational diabetes, preeclampsia, and a larger baby (macrosomia), which can complicate labor and delivery. This calculator uses your pre-pregnancy Body Mass Index (BMI) and current gestational week to provide personalized insights into your weight gain journey.
Who should use it? Any pregnant individual, especially those who want to actively track their progress and ensure they are within recommended guidelines. It's particularly useful for individuals who have concerns about their weight gain, have pre-existing health conditions like diabetes or thyroid issues, or are carrying multiples. Healthcare providers can also use this tool as a visual aid during prenatal appointments.
Common misconceptions about pregnancy weight gain include the idea that "eating for two" means doubling calorie intake from the start, or that weight gain is solely a measure of the baby's size. In reality, weight gain includes the baby, placenta, amniotic fluid, increased blood volume, breast tissue, and maternal fat stores, and calorie needs increase modestly, particularly in the second and third trimesters. Another misconception is that all weight gain is "good" weight; the composition and rate of gain matter significantly.
Pregnancy Weight Gain Calculator Formula and Mathematical Explanation
The core of the pregnancy weight gain calculator relies on established guidelines from health organizations like the Institute of Medicine (IOM). These guidelines recommend specific total weight gain targets and weekly gain rates based on a woman's pre-pregnancy BMI. The calculator estimates where the user falls within these ranges.
The Calculation Process:
Determine BMI Category: The calculator first categorizes the user's pre-pregnancy BMI into Underweight, Normal Weight, Overweight, or Obese categories.
Establish Total Recommended Gain: Based on the BMI category, a target range for total weight gain over the entire pregnancy is identified.
Calculate Current Gain Target Range: For a given gestational week, the calculator determines the expected total weight gained so far. This is generally more linear in the first trimester, then increases at a moderate pace in the second, and picks up slightly more in the third. A simplified approach often uses average weekly gains for different trimesters. For simplicity in many calculators, a steady weekly gain is often applied after the first trimester.
Weeks 1-13 (1st Trimester): Typically 2-4 lbs total.
Weeks 14-27 (2nd Trimester): About 1 lb per week for normal BMI.
Weeks 28-40 (3rd Trimester): About 1 lb per week for normal BMI, potentially slightly less for higher BMIs.
Compare Current Gain to Target: The calculator then compares the user's current projected weight gain (or a hypothetical weight gain based on the week if no current weight is input) against the recommended range for that specific gestational week.
Variables Explained
Variable
Meaning
Unit
Typical Range
Gestational Week
Number of weeks elapsed since the first day of the Last Menstrual Period (LMP).
Weeks
1 – 40
Pre-Pregnancy BMI
Body Mass Index calculated using weight and height before conception.
kg/m²
15 – 40+
Total Recommended Gain
The total pounds a pregnant person should aim to gain by the end of the pregnancy.
lbs
11 – 40 lbs (varies by BMI)
Weekly Recommended Gain
The average amount of weight to gain per week during specific trimesters.
lbs/week
0.5 – 1 lb/week (varies by BMI and trimester)
Current Gain Status
Indicates if the current weight gain is below, within, or above the recommended range for the gestational week.
Categorical (e.g., Below, Within, Above)
N/A
Practical Examples (Real-World Use Cases)
Example 1: Normal Weight Gain
Scenario: Sarah is 28 weeks pregnant and had a normal BMI of 21.5 before pregnancy. She wants to know if her weight gain is on track.
Inputs:
Gestational Week: 28
Pre-Pregnancy BMI: 21.5
Calculation:
BMI Category: Normal Weight (18.5–24.9)
Total Recommended Gain: 25–35 lbs
Weekly Recommended Gain (2nd/3rd Trimester): Approx. 1 lb/week
Estimated Target Gain by Week 28: 28 weeks * 1 lb/week = 28 lbs (This is a simplified calculation; actual gain can vary). Let's assume Sarah has gained 27 lbs.
Outputs:
Main Result: Within Recommended Range
Recommended Range (Total): 25–35 lbs
Current Gain Status: Within Recommended Range (Approx. 27 lbs gained at 28 weeks is within the expected range for a normal BMI)
Recommended Gain This Week: About 1 lb
Interpretation: Sarah's weight gain appears to be on track for a healthy pregnancy, aligning with the general recommendations for her BMI category.
Example 2: Overweight BMI with Higher Gain
Scenario: Maria is 32 weeks pregnant. Her pre-pregnancy BMI was 27.0 (overweight). She's concerned because she feels she's gained a lot of weight.
Inputs:
Gestational Week: 32
Pre-Pregnancy BMI: 27.0
Calculation:
BMI Category: Overweight (25.0–29.9)
Total Recommended Gain: 15–25 lbs
Weekly Recommended Gain (2nd/3rd Trimester): Approx. 0.6 lb/week
Estimated Target Gain by Week 32: 32 weeks * 0.6 lb/week = 19.2 lbs. Let's say Maria has gained 24 lbs.
Outputs:
Main Result: Slightly Above Recommended Range
Recommended Range (Total): 15–25 lbs
Current Gain Status: Slightly Above Recommended Range (Approx. 24 lbs gained at 32 weeks is at the higher end or slightly over the target for an overweight BMI)
Recommended Gain This Week: About 0.6 lb
Interpretation: Maria's weight gain is at the upper limit or slightly exceeding the recommended total gain for her BMI category. While not necessarily alarming, it warrants a discussion with her healthcare provider to review her diet, activity levels, and overall health to ensure the gain is appropriate and to manage potential risks associated with excessive weight gain.
How to Use This Pregnancy Weight Gain Calculator
Using the pregnancy weight gain calculator chart is straightforward and takes just a few moments. Follow these steps to get personalized insights:
Input Gestational Week: Enter the current number of weeks you are into your pregnancy. This is typically counted from the first day of your last menstrual period (LMP). The calculator accepts weeks from 1 to 40.
Input Pre-Pregnancy BMI: Enter your Body Mass Index (BMI) from before you became pregnant. If you don't know your BMI, you can estimate it using online BMI calculators if you know your pre-pregnancy weight and height. A BMI between 18.5 and 24.9 is considered normal weight.
Click 'Calculate': Once you've entered the required information, click the "Calculate" button.
How to Read Results:
Main Result: This gives a quick summary (e.g., "Within Recommended Range," "Below Target," "Above Target").
Recommended Range (Total): Shows the overall weight gain goal (in pounds) for your entire pregnancy, based on your BMI.
Current Gain Status: This provides a more detailed assessment of where your current weight gain (estimated based on gestational week and typical rates) falls compared to the ideal range for your stage of pregnancy and BMI.
Recommended Gain This Week: Indicates the approximate amount of weight gain recommended for the current week, especially relevant for the second and third trimesters.
Chart & Table: The visual chart and table offer broader context, showing recommended gains by BMI category and tracking your progress over time.
Decision-Making Guidance: This calculator is an informational tool, not a substitute for professional medical advice. If your results indicate you are significantly above or below the recommended ranges, or if you have any concerns, it's crucial to discuss them with your doctor or midwife. They can provide personalized guidance based on your unique health status, diet, and lifestyle. Use the results to inform conversations with your healthcare provider and make informed choices about your nutrition and well-being during pregnancy.
Key Factors That Affect Pregnancy Weight Gain Results
While this calculator provides a valuable estimate, several factors influence actual pregnancy weight gain. Understanding these can help interpret the results and guide discussions with healthcare providers:
Individual Metabolism: Every person's body processes nutrients and energy differently. Some individuals naturally gain weight more easily than others, even with similar diets and activity levels.
Dietary Composition: The *type* of calories consumed matters. A diet rich in nutrient-dense foods (fruits, vegetables, lean proteins, whole grains) supports healthy development, while a diet high in processed foods, sugars, and unhealthy fats can contribute to excessive or unhealthy weight gain.
Activity Level: Regular, moderate exercise is generally recommended during pregnancy. Physical activity helps manage weight gain, improves cardiovascular health, and can alleviate common pregnancy discomforts. Sedentary lifestyles can contribute to excessive weight gain.
Underlying Health Conditions: Conditions like gestational diabetes, thyroid disorders, or polycystic ovary syndrome (PCOS) can significantly impact weight gain. Careful monitoring and management are essential.
Number of Fetuses: Pregnancies with twins, triplets, or more typically require higher overall weight gain and follow different guidelines due to increased nutritional demands.
Genetics: Genetic predisposition can play a role in how a person's body stores fat and manages weight.
Nausea and Vomiting (Morning Sickness): Severe nausea and vomiting in early pregnancy can lead to weight loss initially, requiring catch-up gain later.
Edema (Swelling): Fluid retention, common in later pregnancy, can contribute to weight gain that isn't necessarily fat mass.
Frequently Asked Questions (FAQ)
What is considered a "normal" pre-pregnancy BMI?
A pre-pregnancy BMI between 18.5 and 24.9 kg/m² is generally considered normal weight. This category typically has the highest recommended total weight gain during pregnancy (25-35 lbs).
How much weight should I gain in the first trimester?
In the first trimester (weeks 1-13), the recommended weight gain is typically modest, around 2-4 pounds total. Many women experience nausea and may even lose a little weight during this period, which is often fine if they have a normal pre-pregnancy BMI.
What if my pre-pregnancy weight was unavailable?
If you don't know your pre-pregnancy weight, you won't be able to accurately use this calculator. It's best to discuss weight gain goals with your healthcare provider, who can estimate based on your current health and pregnancy stage.
Does this calculator account for water weight or baby's weight?
The calculator's recommendations are based on guidelines that implicitly account for the needs of the baby, placenta, amniotic fluid, increased blood volume, and maternal tissue growth. It focuses on the total maternal weight gain, which is a reflection of all these components and necessary fat stores.
Can I use this calculator if I'm pregnant with multiples?
This calculator is designed for singleton pregnancies. Guidelines for weight gain in multiple pregnancies (twins, triplets, etc.) differ significantly and require personalized recommendations from a healthcare provider.
What does it mean if I'm "above" the recommended range?
If the calculator indicates you are gaining weight above the recommended range for your BMI and gestational week, it suggests a potential for excessive weight gain. This doesn't automatically mean there's a problem, but it's a flag to discuss with your doctor or midwife. They may recommend dietary adjustments or increased physical activity.
How often should I update my weight gain tracking?
Many healthcare providers recommend weekly weigh-ins, especially during the second and third trimesters, to monitor progress. Using this calculator periodically (e.g., weekly or bi-weekly) can help you stay informed about whether your gain aligns with recommendations.
Does post-pregnancy weight retention matter?
Yes, excessive pregnancy weight gain is linked to greater postpartum weight retention, which can increase the long-term risk of obesity and related health issues. Managing weight gain during pregnancy is therefore important for both immediate and long-term maternal health.
var gestationalWeekInput = document.getElementById('gestationalWeek');
var prePregnancyBMIInput = document.getElementById('prePregnancyBMI');
var gestationalWeekError = document.getElementById('gestationalWeekError');
var prePregnancyBMIError = document.getElementById('prePregnancyBMIError');
var resultSummary = document.getElementById('resultSummary');
var mainResult = document.getElementById('mainResult');
var intermediateResults = document.getElementById('intermediateResults');
var totalRecommendedGainSpan = document.getElementById('totalRecommendedGain');
var currentGainStatusSpan = document.getElementById('currentGainStatus');
var weeklyRecommendedGainSpan = document.getElementById('weeklyRecommendedGain');
var formulaExplanation = document.querySelector('.formula-explanation');
var ctx; // Canvas context
var weightGainChart; // Chart instance
var weightGainData = {
labels: [],
recommendedGain: [],
currentGain: []
};
// Default settings for the chart
var chartOptions = {
responsive: true,
maintainAspectRatio: false,
scales: {
x: {
title: {
display: true,
text: 'Gestational Week'
}
},
y: {
title: {
display: true,
text: 'Weight Gain (lbs)'
},
beginAtZero: true
}
},
plugins: {
legend: {
display: false // We will create a custom legend
},
tooltip: {
callbacks: {
label: function(context) {
var label = context.dataset.label || ";
if (label) {
label += ': ';
}
if (context.parsed.y !== null) {
label += context.parsed.y + ' lbs';
}
return label;
}
}
}
}
};
// Function to get BMI category and ranges
function getBMIData(bmi) {
if (bmi = 18.5 && bmi = 25.0 && bmi = 30.0) return { category: 'Obese', totalGain: { min: 11, max: 20 }, weeklyGain: 0.5 };
return null; // Should not happen with validation
}
// Simplified function to estimate current gain based on BMI category and week
// This is a simplified model for demonstration; actual gain varies significantly.
function estimateCurrentGain(bmiData, week) {
if (!bmiData) return { gained: 0, status: 'Unknown' };
var targetTotalGainMin = bmiData.totalGain.min;
var targetTotalGainMax = bmiData.totalGain.max;
var weeklyRate = bmiData.weeklyGain;
var estimatedGain = 0;
if (week <= 13) { // First Trimester
estimatedGain = Math.min(targetTotalGainMax * 0.2, 4); // Max 4 lbs or 20% of total
estimatedGain = Math.max(estimatedGain, targetTotalGainMin * 0.1); // Min 10% of total
} else if (week <= 27) { // Second Trimester
var gainFirstTri = (targetTotalGainMin * 0.1 + targetTotalGainMax * 0.2) / 2; // Average gain from first tri
estimatedGain = gainFirstTri + (week – 13) * weeklyRate;
} else { // Third Trimester
var gainSecondTriEnd = (targetTotalGainMin * 0.1 + targetTotalGainMax * 0.2) / 2 + (27 – 13) * weeklyRate; // Gain by end of second tri
estimatedGain = gainSecondTriEnd + (week – 27) * weeklyRate;
}
// Ensure estimated gain doesn't exceed total target
estimatedGain = Math.min(estimatedGain, targetTotalGainMax);
estimatedGain = Math.max(estimatedGain, targetTotalGainMin * 0.1); // Minimum gain even in early weeks
var currentGainStatus = 'Within Range';
if (estimatedGain targetTotalGainMax) {
currentGainStatus = 'Above Target';
}
// Add nuance for current week vs total
var targetWeeklyMin = 0.5; // General minimum for any week after first few
var targetWeeklyMax = 1.0; // General maximum for normal BMI
if(bmiData.category === 'Overweight') {
targetWeeklyMax = 0.6;
} else if (bmiData.category === 'Obese') {
targetWeeklyMax = 0.5;
} else if (bmiData.category === 'Underweight') {
targetWeeklyMax = 1.0;
}
// Refine status based on current week's expected gain
var currentWeekGain = (week > 13) ? weeklyRate : (week <=13 ? (estimatedGain / week) : 0) ;
if(currentWeekGain 13) currentGainStatus = 'Below Target Rate';
if(currentWeekGain > targetWeeklyMax && week > 13) currentGainStatus = 'Above Target Rate';
// Final override if total gain is way off
if (estimatedGain targetTotalGainMax * 1.2) currentGainStatus = 'Significantly Above Target';
return { gained: parseFloat(estimatedGain.toFixed(1)), status: currentGainStatus };
}
function calculateWeightGain() {
// Clear previous errors
gestationalWeekError.textContent = ";
prePregnancyBMIError.textContent = ";
var week = parseFloat(gestationalWeekInput.value);
var bmi = parseFloat(prePregnancyBMIInput.value);
// Validation
if (isNaN(week) || week 40) {
gestationalWeekError.textContent = 'Please enter a valid week between 1 and 40.';
return;
}
if (isNaN(bmi) || bmi <= 0) {
prePregnancyBMIError.textContent = 'Please enter a valid BMI value.';
return;
}
var bmiData = getBMIData(bmi);
if (!bmiData) {
prePregnancyBMIError.textContent = 'Invalid BMI entered. Please check the range.';
return;
}
var estimatedCurrent = estimateCurrentGain(bmiData, week);
var totalRecommendedMin = bmiData.totalGain.min;
var totalRecommendedMax = bmiData.totalGain.max;
var weeklyRecommended = bmiData.weeklyGain;
var totalRecommendedText = totalRecommendedMin + '–' + totalRecommendedMax + ' lbs';
var currentGainStatusText = estimatedCurrent.status;
var weeklyRecommendedText = 'About ' + weeklyRecommended + ' lb/week';
// Determine main result message
var mainResultText = '';
if (estimatedCurrent.status === 'Within Range' || estimatedCurrent.status === 'Within Target Rate') {
mainResultText = 'Within Recommended Range';
mainResult.style.color = 'var(–success-color)';
} else if (estimatedCurrent.status.includes('Below')) {
mainResultText = 'Below Recommended Range';
mainResult.style.color = '#ffc107'; // Warning color
} else { // Above Target
mainResultText = 'Above Recommended Range';
mainResult.style.color = '#dc3545'; // Danger color
}
// Adjust display based on actual estimated gain vs total range
if (estimatedCurrent.gained totalRecommendedMax) {
currentGainStatusText = 'Above Target';
mainResultText = 'Above Recommended Range';
mainResult.style.color = '#dc3545';
} else {
currentGainStatusText = 'Within Range';
mainResultText = 'Within Recommended Range';
mainResult.style.color = 'var(–success-color)';
}
// Update results display
resultSummary.style.display = 'none';
mainResult.textContent = mainResultText;
mainResult.style.display = 'inline-block';
totalRecommendedGainSpan.textContent = totalRecommendedText;
currentGainStatusSpan.textContent = currentGainStatusText + ' (Estimated ' + estimatedCurrent.gained + ' lbs gained)';
weeklyRecommendedGainSpan.textContent = weeklyRecommendedText;
intermediateResults.style.display = 'block';
formulaExplanation.innerHTML = 'Formula Used: Calculations are based on guidelines from the Institute of Medicine (IOM) which recommend total weight gain and weekly gain rates specific to pre-pregnancy BMI. This calculator estimates your current position within those guidelines based on gestational week.';
updateChart(week, bmiData, estimatedCurrent.gained);
}
function updateChart(currentWeek, bmiData, estimatedGain) {
// Generate data for the chart up to the current week or a bit beyond
var weeksToDisplay = Math.min(currentWeek + 5, 40);
weightGainData.labels = [];
weightGainData.recommendedGain = [];
weightGainData.currentGain = [];
var totalRecommendedMin = bmiData.totalGain.min;
var totalRecommendedMax = bmiData.totalGain.max;
var weeklyRate = bmiData.weeklyGain;
for (var i = 1; i <= weeksToDisplay; i++) {
weightGainData.labels.push(i);
var recommendedMinForWeek = 0;
var recommendedMaxForWeek = 0;
var estimatedGainForWeek = 0;
if (i 0 ? 0 : 0)); // Minimal gain early on
recommendedMaxForWeek = Math.min(totalRecommendedMax * 0.2, 4);
// Simple linear estimate for current gain in first tri
estimatedGainForWeek = (i / 13) * ( (recommendedMinForWeek + recommendedMaxForWeek) / 2 );
estimatedGainForWeek = Math.max(estimatedGainForWeek, 0); // Ensure it's not negative
estimatedGainForWeek = Math.min(estimatedGainForWeek, 4); // Cap at 4 lbs
} else if (i <= 27) { // Second Trimester
var gainFirstTriAvg = (totalRecommendedMin * 0.1 + totalRecommendedMax * 0.2) / 2;
recommendedMinForWeek = gainFirstTriAvg + (i – 13) * weeklyRate * 0.8; // Lower end of weekly rate
recommendedMaxForWeek = gainFirstTriAvg + (i – 13) * weeklyRate * 1.2; // Higher end of weekly rate
estimatedGainForWeek = gainFirstTriAvg + (i – 13) * weeklyRate; // Average for current gain
} else { // Third Trimester
var gainSecondTriEndAvg = (totalRecommendedMin * 0.1 + totalRecommendedMax * 0.2) / 2 + (27 – 13) * weeklyRate;
recommendedMinForWeek = gainSecondTriEndAvg + (i – 27) * weeklyRate * 0.8;
recommendedMaxForWeek = gainSecondTriEndAvg + (i – 27) * weeklyRate * 1.2;
estimatedGainForWeek = gainSecondTriEndAvg + (i – 27) * weeklyRate;
}
// Clamp values to overall total gain range
recommendedMinForWeek = Math.max(recommendedMinForWeek, totalRecommendedMin * (i / 40));
recommendedMaxForWeek = Math.min(recommendedMaxForWeek, totalRecommendedMax * (i / 40));
estimatedGainForWeek = Math.min(estimatedGainForWeek, totalRecommendedMax);
estimatedGainForWeek = Math.max(estimatedGainForWeek, totalRecommendedMin * 0.1); // Ensure minimum plausible gain
weightGainData.recommendedGain.push({x: i, y: recommendedMaxForWeek}); // Plotting the upper bound of recommended gain for simplicity
weightGainData.currentGain.push({x: i, y: estimatedGainForWeek});
}
if (weightGainChart) {
weightGainChart.data.labels = weightGainData.labels;
weightGainChart.data.datasets[0].data = weightGainData.recommendedGain; // Recommended upper bound
weightGainChart.data.datasets[1].data = weightGainData.currentGain; // Estimated current gain
weightGainChart.update();
} else {
var canvas = document.getElementById('weightGainChart');
ctx = canvas.getContext('2d');
weightGainChart = new Chart(ctx, {
type: 'line',
data: {
labels: weightGainData.labels,
datasets: [{
label: 'Recommended Upper Gain Limit',
data: weightGainData.recommendedGain,
borderColor: 'rgba(40, 167, 69, 1)', // Success color
backgroundColor: 'rgba(40, 167, 69, 0.2)',
tension: 0.1,
fill: false,
pointRadius: 3
}, {
label: 'Estimated Current Gain',
data: weightGainData.currentGain,
borderColor: 'rgba(0, 74, 153, 1)', // Primary color
backgroundColor: 'rgba(0, 74, 153, 0.2)',
tension: 0.1,
fill: false,
pointRadius: 3
}]
},
options: chartOptions
});
}
updateChartLegend();
}
function updateChartLegend() {
var legendHtml = 'Chart Key:
';
legendHtml += '
Recommended Upper Gain Limit
';
legendHtml += '
Estimated Current Gain
';
legendHtml += '
';
document.getElementById('chartLegend').innerHTML = legendHtml;
}
function resetCalculator() {
gestationalWeekInput.value = 20;
prePregnancyBMIInput.value = 22.5;
document.getElementById('gestationalWeekError').textContent = ";
document.getElementById('prePregnancyBMIError').textContent = ";
resultSummary.style.display = 'block';
resultSummary.innerHTML = 'Enter your gestational week and pre-pregnancy BMI to see recommended weight gain ranges.';
mainResult.style.display = 'none';
intermediateResults.style.display = 'none';
formulaExplanation.textContent = ";
// Reset chart data and redraw
if (weightGainChart) {
weightGainChart.destroy();
weightGainChart = null;
ctx = null;
document.getElementById('weightGainChart').getContext('2d').clearRect(0, 0, canvas.width, canvas.height); // Clear canvas
}
document.getElementById('chartLegend').innerHTML = "; // Clear legend
}
function copyResults() {
var resultText = "Pregnancy Weight Gain Calculator Results:\n\n";
var summaryContent = resultSummary.style.display !== 'none' ? resultSummary.textContent.trim() : ";
var mainResultContent = mainResult.style.display !== 'none' ? `Status: ${mainResult.textContent.trim()}\n` : ";
var intermediateContent = ";
if(intermediateResults.style.display !== 'none') {
intermediateContent = `Recommended Total Gain: ${totalRecommendedGainSpan.textContent.trim()}\n` +
`Current Gain Status: ${currentGainStatusSpan.textContent.trim()}\n` +
`Recommended Gain This Week: ${weeklyRecommendedGainSpan.textContent.trim()}\n`;
}
var assumptions = `Assumptions: Based on pre-pregnancy BMI of ${prePregnancyBMIInput.value} and gestational week ${gestationalWeekInput.value}. Estimates use standard guidelines.`;
resultText += summaryContent ? `${summaryContent}\n\n` : ";
resultText += mainResultContent;
resultText += intermediateContent;
resultText += `\n${assumptions}`;
// Use a temporary textarea to copy
var textArea = document.createElement("textarea");
textArea.value = resultText;
document.body.appendChild(textArea);
textArea.select();
try {
document.execCommand('copy');
alert('Results copied to clipboard!');
} catch (err) {
console.error('Failed to copy: ', err);
alert('Failed to copy results. Please copy manually.');
}
document.body.removeChild(textArea);
}
function toggleFaq(element) {
var parent = element.parentElement;
parent.classList.toggle('active');
}
// Initial calculation on load if inputs have values
document.addEventListener('DOMContentLoaded', function() {
calculateWeightGain(); // Perform initial calculation
});