Java Helper Class: BMI calculator, lb to kg converter, kg to lb converter, feet to cm converter, cm to feet converter

Hey Guy’s,

Long time no seen. Today I want to share with you Java helper class that I have designed for one  of the projects I am working on. This class will be useful for you, if your application works with height and weight conversions, also if you need to calculate Body Mass Index.

My helper class has following functionality:

– Kg to Lb Converter
– Lb to Kg Converter
– BMI (Body Mass Index) Calculator and “Classificator
– Feet to Cm Converter
– Cm to Feet Converter

Here is the class:

import java.text.DecimalFormat;

* This class is used for any calculations connected with Weight and Height
*  - KG to LB converter (and vice versa)
*  - Feet to Cm converter (and vice versa)
*  - BMI Calculation
public class HeightWeightHelper {

* @param value double that is formatted
* @return double that has 1 decimal place
private double format ( double value) {
  if ( value != 0){
   DecimalFormat df = new DecimalFormat("###.#");
   return Double.valueOf(df.format(value));
 } else {
   return -1;

* @param lb - pounds
* @return kg rounded to 1 decimal place
public double lbToKgConverter(double lb) {
  return format(lb * 0.45359237 );

* @param kg - kilograms
* @return lb rounded to 1 decimal place
public double kgToLbConverter(double kg) {
  return format(kg * 2.20462262);

* @param cm - centimeters
* @return feet rounded to 1 decimal place
public double cmToFeetConverter(double cm) {
  return format(cm * 0.032808399 );

* @param feet - feet
* @return centimeters rounded to 1 decimal place
public double feetToCmConverter(double feet) {
  return format(feet * 30.48 );

* @param height in <b>cm</b>
* @param weight in <b>kilograms</b>
* @return BMI index with 1 decimal place
public double getBMIKg (double height, double weight) {
  double meters = height/100;
  return format( weight / Math.pow(meters,2));

* @param height in <b>feet</b>
* @param weight in <b>pounds</b>
* @return BMI index with 1 decimal place
public double getBMILb (double height, double weight) {
  int inch = (int)(height *12);
  return format((weight*703) / Math.pow(inch, 2));

* @param bmi (Body Mass Index)
* @return BMI classification based on the bmi number
public String getBMIClassification (double bmi) {

 if (bmi <= 0) return "unknown";
 String classification;

 if (bmi < 18.5) {
  classification = "underweight";
 } else if (bmi < 25) {
  classification = "normal";
 } else if (bmi < 30) {
  classification = "overweight";
 } else {
  classification = "obese";

 return classification;

}//end of class

P.S If you want to have JUnit tests for this class let me know, I have them too 🙂



About Anatoly Spektor

My name is Anatoly Spektor (originally Anatolijs Spektors) I am Software and Web Developer. I have worked in Seneca Center for Development of Open Technology on Big Blue Button Add-on - Polling Module, Red Hat and some other places :) I am an author of the book 'Eclipse Debugging How To', Muay Thai fighter and amateur photographer ;)
This entry was posted in Helper Class, Java, open-source, Programming Languages, Useful Functions and tagged , , , , , , , , , , , , , , , , , , , , . Bookmark the permalink.

39 Responses to Java Helper Class: BMI calculator, lb to kg converter, kg to lb converter, feet to cm converter, cm to feet converter

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