Hello guys, This tutorial is all about How to Create Simple Calorie Calculator Using PHP.
Determining our calorie will help us have a balanced diet and Calorie are essential for human health.
So let’s get started:
First create a class and name it “index.php” and add this code:
<html>
<body>
<center>
<head><h1><font face = "forte">Simple Calorie Calculator</font></h1></head>
<form method="post">
Gender:
<Select name="gender" ><br>
<option>Male</option>
<option>Female</option>
</select><br><br>
Age:
<input name="age" type="text"> yrs.<br><br>
Weight:
<input name="weight" type="text">kgs.<br><br>
Height:
<input name="height" type="text">cm.<br><br>
<br><input type="Submit" value="Calculate">
<?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>";
}
?>
</form>
</center>
</body>
</html>Simple as that! Go and test the program now.
Here’s the output:

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Download Source code here:
Frequently Asked Questions
What does this PHP tutorial cover?
Focused PHP language or library tutorial showing a single concept with working code. Use as a building block when assembling a larger system.
What PHP and MySQL versions does this project require?
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How do I set up the database for this PHP project?
Open phpMyAdmin (http://localhost/phpmyadmin/ on XAMPP), create a new empty database with the name specified in the project’s config.php. Click the Import tab, choose the included .sql file, click Go. Then edit config.php (or includes/connection.php) with: ‘localhost’, your MySQL username (usually ‘root’), your MySQL password (usually blank for XAMPP), and the database name.
Can I use this PHP project for a BSIT capstone or thesis?
Yes, but extend it. A bare CRUD app is too narrow for full capstone scope. Add: user roles via session checks, reports/dashboards (Chart.js + AJAX), PDF exports (TCPDF library), email notifications (PHPMailer), real domain extension (analytics, audit log, multi-branch support). Pair with Chapter 1-5 documentation matching your panel’s rubric.
Why am I getting ‘connection error’ or ‘undefined function mysqli_connect’?
Three common PHP issues: (1) Connection error: Apache + MySQL services not running in XAMPP control panel, OR database name in config.php does not match what you created in phpMyAdmin. (2) ‘undefined function mysqli_connect’: MySQL extension not enabled, in php.ini uncomment extension=mysqli (then restart Apache). (3) ‘No such file or directory’: MySQL socket path wrong, use 127.0.0.1 instead of localhost in the connection string.
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if we have to add person daily activity like he/she is active ,moderate active something like that then who we calculate calories?????
give me the reply as soon as possible.
Thanks!
It’s wonderful, just give it some CSS and let users enjoy it.