Basic Metabolic Rate (BMR) Calculator
Your Basic Metabolic Rate (BMR) is the minimum number of calories your body needs to perform essential functions like breathing, circulation, and cell production while at rest. It's essentially the energy your body expends to keep you alive. Several factors influence your BMR, including age, sex, weight, and height. This calculator uses the Mifflin-St Jeor equation, which is considered one of the most accurate for estimating BMR.
Calculate BMR
function calculateBMR() {
var gender = document.getElementById("gender").value;
var weight = parseFloat(document.getElementById("weight").value);
var height = parseFloat(document.getElementById("height").value);
var age = parseFloat(document.getElementById("age").value);
var bmr = 0;
var resultElement = document.getElementById("result");
if (isNaN(weight) || weight <= 0 || isNaN(height) || height <= 0 || isNaN(age) || age 0) {
resultElement.innerHTML = "Your estimated Basal Metabolic Rate (BMR) is:
" + bmr.toFixed(2) + " calories per day.";
resultElement.style.color = "#333"; // Default color for success
} else {
resultElement.innerHTML = "Could not calculate BMR with the provided information. Please check your inputs.";
resultElement.style.color = "red";
}
}
.calculator-container {
font-family: sans-serif;
max-width: 600px;
margin: 20px auto;
padding: 20px;
border: 1px solid #ddd;
border-radius: 8px;
box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}
.calculator-title {
text-align: center;
color: #333;
margin-bottom: 15px;
}
.calculator-description {
color: #555;
line-height: 1.6;
margin-bottom: 25px;
text-align: justify;
}
.calculator-inputs {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
gap: 15px;
margin-bottom: 20px;
}
.input-group {
display: flex;
flex-direction: column;
}
.input-group label {
margin-bottom: 5px;
font-weight: bold;
color: #444;
}
.input-group input,
.input-group select {
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 1em;
}
.calculate-button {
display: block;
width: 100%;
padding: 12px 20px;
background-color: #007bff;
color: white;
border: none;
border-radius: 4px;
font-size: 1.1em;
cursor: pointer;
transition: background-color 0.3s ease;
}
.calculate-button:hover {
background-color: #0056b3;
}
.calculator-result {
margin-top: 25px;
padding: 15px;
background-color: #f9f9f9;
border: 1px solid #eee;
border-radius: 4px;
text-align: center;
font-size: 1.1em;
min-height: 40px; /* To prevent layout shifts */
}