Calculate your Body Mass Index (BMI) to understand your current weight status and guide your weight loss journey.
Understanding BMI and Its Role in Weight Loss
Body Mass Index (BMI) is a measure that uses your height and weight to estimate the amount of body fat you have. It's a widely used screening tool to determine if your weight is healthy for your height.
How BMI is Calculated
The formula for BMI is:
BMI = Weight (kg) / (Height (m) * Height (m))
Note: In this calculator, we ask for height in centimeters (cm). The calculator will automatically convert it to meters (m) for the calculation. 1 meter = 100 centimeters.
Interpreting Your BMI Score
Your BMI score falls into one of several categories:
Below 18.5: Underweight
18.5 – 24.9: Healthy Weight
25.0 – 29.9: Overweight
30.0 and above: Obese
Using BMI for Weight Loss
For individuals looking to lose weight, BMI serves as a crucial starting point. It helps you understand your current weight classification. If your BMI indicates you are overweight or obese, it signifies that weight loss could offer significant health benefits.
Goal Setting: A healthy BMI range is typically between 18.5 and 24.9. Your BMI can help you set realistic weight loss goals. For example, if your BMI is 32, a goal might be to reach a BMI of 24.9.
Monitoring Progress: While BMI is not a direct measure of body fat and doesn't account for muscle mass, it can be a useful indicator to track overall progress when combined with other health metrics.
Health Risks: Being in the overweight or obese categories (BMI 25.0+) increases the risk of several health issues, including heart disease, type 2 diabetes, high blood pressure, and certain types of cancer. Weight loss can help mitigate these risks.
Important Considerations:
BMI is a screening tool, not a diagnostic one. It doesn't consider factors like muscle mass, bone density, or body composition. Athletes or individuals with very muscular builds may have a high BMI without being unhealthy. Consult with a healthcare professional for personalized advice on weight loss and health management.
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) || weight <= 0 || height <= 0) {
resultDiv.innerHTML = "Please enter valid positive numbers for weight and height.";
return;
}
// Convert height from cm to meters
var heightInMeters = height / 100;
// Calculate BMI
var bmi = weight / (heightInMeters * heightInMeters);
// Round BMI to one decimal place
var roundedBMI = bmi.toFixed(1);
var interpretation = "";
var colorClass = "";
if (roundedBMI = 18.5 && roundedBMI = 25.0 && roundedBMI = 30.0
interpretation = "Obese. Significant health benefits can be achieved through weight loss. Seek guidance from a healthcare provider.";
colorClass = "color-obese";
}
resultDiv.innerHTML = "Your BMI is: " + roundedBMI + "" + interpretation;
resultDiv.style.borderColor = getColorForBMI(roundedBMI); // Set dynamic border color
}
// Helper function to determine border color based on BMI category
function getColorForBMI(bmi) {
var numericBMI = parseFloat(bmi);
if (numericBMI = 18.5 && numericBMI = 25.0 && numericBMI = 30.0) return "#dc3545"; // Danger/Red for Obese
return "#004a99"; // Default to primary blue
}