This calculator helps you determine your Body Mass Index (BMI), a widely used metric to assess your weight status relative to your height. It's a simple screening tool, not a diagnostic tool, and should be used in conjunction with advice from a healthcare professional.
How BMI is Calculated
The formula for BMI is:
BMI = (Weight in Kilograms) / (Height in Meters)^2
In this calculator, we use centimeters for height. To convert centimeters to meters, we divide by 100. So, if your height is 'H' cm, your height in meters is H/100. The formula then becomes:
BMI = Weight (kg) / (Height (cm) / 100)^2
This calculator automatically handles the conversion and computation for you.
Interpreting Your BMI
The calculated BMI value is then categorized as follows:
Underweight: BMI less than 18.5
Normal weight: BMI between 18.5 and 24.9
Overweight: BMI between 25 and 29.9
Obesity: BMI of 30 or greater
Why is This Important?
Maintaining a healthy weight is crucial for overall well-being. Being significantly underweight or overweight can increase your risk of various health problems, including:
Heart disease and stroke
Type 2 diabetes
Certain types of cancer
Sleep apnea
Osteoarthritis
High blood pressure
This calculator provides a starting point for understanding your current weight status. For personalized advice and health recommendations, always consult with a doctor or a registered dietitian.
function calculateHealthWeight() {
var weightInput = document.getElementById("weight");
var heightInput = document.getElementById("height");
var resultDiv = document.getElementById("result");
var weight = parseFloat(weightInput.value);
var heightCm = parseFloat(heightInput.value);
// Validate inputs
if (isNaN(weight) || isNaN(heightCm) || weight <= 0 || heightCm <= 0) {
resultDiv.innerHTML = "Please enter valid positive numbers for weight and height.";
resultDiv.style.color = "#dc3545"; // Red for error
return;
}
// Convert height from cm to meters
var heightM = heightCm / 100;
// Calculate BMI
var bmi = weight / (heightM * heightM);
// Display BMI and interpretation
var bmiRounded = bmi.toFixed(1);
var interpretation = "";
if (bmi = 18.5 && bmi = 25 && bmi <= 29.9) {
interpretation = "Overweight";
} else {
interpretation = "Obese";
}
resultDiv.innerHTML = "Your BMI: " + bmiRounded + " (" + interpretation + ")";
resultDiv.style.color = "#28a745"; // Green for success
}