.calculator-wrapper {
font-family: sans-serif;
border: 1px solid #ddd;
padding: 20px;
border-radius: 8px;
max-width: 500px;
margin: 20px auto;
background-color: #f9f9f9;
}
.calculator-title {
text-align: center;
color: #333;
margin-bottom: 20px;
}
.form-group {
margin-bottom: 15px;
}
.form-group label {
display: block;
margin-bottom: 5px;
color: #555;
font-weight: bold;
}
.form-group input[type="number"] {
width: calc(100% – 22px); /* Adjust for padding and border */
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
box-sizing: border-box; /* Include padding and border in the element's total width and height */
}
.calculate-button {
display: block;
width: 100%;
padding: 12px 20px;
background-color: #4CAF50;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 16px;
transition: background-color 0.3s ease;
}
.calculate-button:hover {
background-color: #45a049;
}
.calculator-result {
margin-top: 25px;
padding: 15px;
background-color: #e7e7e7;
border: 1px solid #ccc;
border-radius: 4px;
text-align: center;
font-size: 1.1em;
color: #333;
}
.bmi-category {
font-weight: bold;
}
function calculateBMI() {
var weightInput = document.getElementById("weight");
var heightInput = document.getElementById("height");
var resultDiv = document.getElementById("result");
var weight = parseFloat(weightInput.value);
var height = parseFloat(heightInput.value);
if (isNaN(weight) || isNaN(height) || height <= 0) {
resultDiv.innerHTML = "Please enter valid weight and height values.";
return;
}
var bmi = weight / (height * height);
bmi = bmi.toFixed(2); // Round to 2 decimal places
var bmiCategory = "";
if (bmi = 18.5 && bmi = 25 && bmi <= 29.9) {
bmiCategory = "Overweight";
} else {
bmiCategory = "Obesity";
}
resultDiv.innerHTML = "Your BMI is:
" + bmi + " (" + bmiCategory + ")";
}
Understanding Body Mass Index (BMI)
Body Mass Index (BMI) is a simple measurement that uses your height and weight to estimate the amount of body fat you have. It's a commonly used screening tool for weight categories that may lead to health problems. While it doesn't directly measure body fat, it often correlates with it.
How is BMI Calculated?
The formula for BMI is:
BMI = weight (kg) / [height (m)]²
In simpler terms, you divide your weight in kilograms by the square of your height in meters. For example, if a person weighs 70 kg and is 1.75 meters tall:
BMI = 70 / (1.75 * 1.75) = 70 / 3.0625 ≈ 22.86
BMI Categories
The results are typically interpreted using the following standard categories:
- Underweight: BMI less than 18.5
- Normal weight: BMI between 18.5 and 24.9
- Overweight: BMI between 25 and 29.9
- Obesity: BMI 30 or greater
Why is BMI Important?
Maintaining a healthy BMI is associated with a lower risk of various chronic diseases, including heart disease, type 2 diabetes, high blood pressure, and certain types of cancer. Conversely, being significantly underweight or overweight can increase the risk of health complications.
Limitations of BMI
It's important to remember that BMI is a screening tool, not a diagnostic tool. It has limitations:
- It doesn't distinguish between muscle mass and fat mass. Athletes with a lot of muscle may have a high BMI but be very healthy.
- It doesn't account for body composition or fat distribution.
- It may not be as accurate for certain populations, such as the elderly or pregnant women.
For a comprehensive assessment of your health and weight, it's always best to consult with a healthcare professional.