# How to Calculate Simple Interest with Example in PHP

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How to calculate simple interest with example in PHP.

In this article, you will learn how to calculate simple interest with examples in PHP.

### Example

**Principal = 5
Time = 7
Rate = 9**

**Simple Interest = 3.15**

## Simple Interest Formula

`SI = (P * T * R) / 100`

Source Code

```
<?php
// How to Calculate Simple Interest with Example in PHP
$p = 5;
$t = 7;
$r = 9;
$SI = NULL;
// $p=principal, $t=time, $r=rate, $SI=simple interest
// It will calculate the simple interest
$SI = ($p * $t * $r) / 100;
// It will print the final output
echo "Simple Interest = " . $SI;
?>
```

### Output

`Simple Interest = 3.15`

### Explanation

In this given program we have taken input variables named with their values

, **$p = 5**

, and **$t = 7**

. After that, we applied the standard formula to calculate the simple interest.**$r = 9**

Then It will return the

simple interest of the above program.**3.15**