BMI Calculator Create Using JavaScript

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<!DOCTYPE html>
<html>
<head>
<title>BMI Calculator Create Using JavaScript</title>
</head>
<body>
<h1>BMI Calculator Create Using JavaScript</h1>
<form name="bmiForm">
Your Weight(kg): <input type="text" name="weight" size="10"><br />
Your Height(cm): <input type="text" name="height" size="10"><br />
<input type="button" value="Calculate BMI" onClick="bmiCalculator()"><br />
Your BMI: <input type="text" name="bmi" size="10"><br />
This Means: <input type="text" name="meaning" size="25"><br />
<input type="reset" value="Reset" />
</form>
<script>
function bmiCalculator() {
var weight = document.bmiForm.weight.value
var height = document.bmiForm.height.value
if(weight > 0 && height > 0){ 
var finalBmi = weight/(height/100*height/100)
document.bmiForm.bmi.value = finalBmi
if(finalBmi < 18.5){
document.bmiForm.meaning.value = "That you are too thin."
}
if(finalBmi > 18.5 && finalBmi < 25){
document.bmiForm.meaning.value = "That you are healthy."
}
if(finalBmi > 25){
document.bmiForm.meaning.value = "That you have overweight."
}
}
else{
alert("Please Fill in everything correctly")
}
}
</script>
</body>
</html>

Output