A Simple Calorie Calculator using Php

<?php
	$age=$_POST['age'];
	$weight=$_POST['weight'];
	$height = $_POST['height'];
	$calories="0.0215183";
	$gender=$_POST['gender'];
 
	switch ($gender){
	        case 'Female':
		$gender= 655 + (9.6 * $weight ) + (1.8 * $height) - (4.7 * $age);
	        echo "<p>Your estimated daily metabolic rate is $gender </p>";
	        echo "<p>This means that you need rouhgly $gender calories a day to maintain your current weight.</p>";
 
	break;
		case 'Male':
		$gender=66 + (13.7 *$weight) + (5 * $height) - (6.8 * $age);
		echo "<p>Your estimated daily metabolic rate is $gender </p>";
		echo "<p>This means that you need rouhgly $gender calories a day to maintain your current weight.</p>";
 
	}
?>