bm.js

function calculateBMI() {
    var weight = parseFloat(document.getElementById("weight").value);
    var height = parseFloat(document.getElementById("height").value);

    if (isNaN(weight) || isNaN(height)) {
        alert("Please enter valid weight and height.");
        return;
    }

    var bmi = weight / (height * height);
    var bmiCategory = interpretBMI(bmi);

    document.getElementById("result").innerHTML = "Your BMI is " + bmi.toFixed(2) + ". You are classified as: " + bmiCategory;
}

function interpretBMI(bmi) {
    if (bmi < 18.5) {
        return "Underweight";
    } else if (bmi >= 18.5 && bmi < 25) {
        return "Normal weight";
    } else if (bmi >= 25 && bmi < 30) {
        return "Overweight";
    } else {
        return "Obese";
    }
}