Understanding the Body Mass Index (BMI) Calculator
Body Mass Index (BMI) is a simple, inexpensive, and non-invasive method for estimating body fat. It's calculated using your height and weight. A higher BMI generally indicates a higher body fat percentage. BMI is a screening tool and not a diagnostic tool. It doesn't account for factors like muscle mass, bone density, or body composition, which can affect weight.
BMI is categorized as follows (for adults):
- 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
It's important to consult with a healthcare professional for a comprehensive assessment of your health and weight status. This calculator is for informational purposes only.
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 numbers for weight and a height greater than zero.";
return;
}
var bmi = weight / (height * height);
bmi = bmi.toFixed(1); // Round BMI to one decimal place
var bmiCategory;
if (bmi = 18.5 && bmi = 25 && bmi <= 29.9) {
bmiCategory = "Overweight";
} else {
bmiCategory = "Obesity";
}
resultDiv.innerHTML = "Your BMI is:
" + bmi + " (" + bmiCategory + ")";
}
#bmi-calculator-wrapper {
font-family: sans-serif;
border: 1px solid #ccc;
padding: 20px;
border-radius: 8px;
max-width: 600px;
margin: 20px auto;
background-color: #f9f9f9;
}
#bmi-calculator-form {
margin-top: 20px;
}
#bmi-calculator-form label {
display: inline-block;
width: 120px;
margin-bottom: 10px;
}
#bmi-calculator-form input[type="number"] {
padding: 8px;
border: 1px solid #ccc;
border-radius: 4px;
width: 150px;
}
#bmi-calculator-form button {
padding: 10px 15px;
background-color: #4CAF50;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
}
#bmi-calculator-form button:hover {
background-color: #45a049;
}
#result {
margin-top: 20px;
font-weight: bold;
color: #333;
}
#bmi-calculator-wrapper article h2,
#bmi-calculator-wrapper article h3 {
color: #333;
margin-bottom: 15px;
}
#bmi-calculator-wrapper article p {
line-height: 1.6;
margin-bottom: 10px;
}
#bmi-calculator-wrapper article ul {
margin-left: 20px;
margin-bottom: 10px;
}
#bmi-calculator-wrapper article li {
margin-bottom: 5px;
}