BMI Calculator

WHO classsification of BMI and bodyweight

Kilograms
Grams
Pounds

Meters
Centimeters
Feet
Inches

Calculate

BMI Range (kg/m2)	BMI Range (lb/ft2)	Category
< 18.5	< 0.703	Underweight
18.5 – 24.9	0.703 – 0.956	Normal weight
25 – 29.9	0.957 – 1.106	Overweight
30 – 34.9	1.107 – 1.286	Obese I
35 – 39.9	1.287 – 1.473	Obese II
≥ 40	≥ 1.474	Obese III

function calculateBMI() {
var weight = parseFloat(document.getElementById(‘weight’).value);
var height = parseFloat(document.getElementById(‘height’).value);
var weightUnit = document.getElementById(‘weightUnit’).value;
var heightUnit = document.getElementById(‘heightUnit’).value;
var bmi;

if (weightUnit === ‘g’) {
weight = weight / 1000;
} else if (weightUnit === ‘lb’) {
weight = weight * 0.453592;
}

if (heightUnit === ‘cm’) {
height = height / 100;
} else if (heightUnit === ‘ft’) {
height = height * 0.3048;
} else if (heightUnit === ‘in’) {
height = height * 0.0254;
}

bmi = weight / (height * height);

var resultElement = document.getElementById(‘result’);
resultElement.innerHTML = ‘Your BMI: ‘ + bmi.toFixed(2) + ‘‘;

var referenceTable = document.getElementById(‘referenceTable’);
var category = ”;

if (bmi = 18.5 && bmi = 25 && bmi = 30 && bmi = 35 && bmi < 40) {
category = 'Obese II';
resultElement.style.color = '#ff3300';
} else {
category = 'Obese III';
resultElement.style.color = '#ff0000';
}

resultElement.innerHTML += '
Category: ‘ + category + ‘‘;
}