Best BMI Calculator in Android Studio 2023: Mastering Health with a Thrilling Fitness Journey

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BMI stands for Body Mass Index, which is a measure of a person’s body fat based on their weight and height. It is a commonly used tool to assess whether a person’s weight is healthy or not.

The calculation of BMI involves dividing a person’s weight in kilograms by the square of their height in meters. The result of this calculation is then used to categorize the person’s weight status based on a range of BMI values:

  • Below 18.5: underweight
  • 18.5-24.9: normal weight
  • 25-29.9: overweight
  • 30 or above: obese

However, it’s important to note that BMI is not a perfect measure of body fat, as it doesn’t take into account factors such as muscle mass, bone density, and overall body composition. Therefore, it should be used as a general guide rather than a definitive assessment of a person’s health. It’s always best to consult with a healthcare professional for an accurate assessment of your weight and overall health.


1. Open Android Studio and click on “Start a new Android Studio project” from the welcome screen. If you already have a project open, you can create a new one by going to “File” > “New” > “New Project”.

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2. In the “Create New Project” dialog, choose “Empty Activity” from the list of templates and click on “Next”.

3. Enter the name of your app in the “Application name” field. This will be the name that appears on the user’s device when they install your app. You can also choose the package name, which is a unique identifier for your app.

4. Choose the minimum API level that your app will support. This determines the oldest version of Android that your app can run on. You can also choose the language that you want to use for your app development. Once you have made your selections, click on “Finish”.

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Android Studio will now create a new project with an empty activity. The activity is a basic screen that users will see when they open your app. You can customize this activity by adding UI elements and functionality.


First of all I wish to remove the action bar in the main activity of an Android app:
1. Open the main activity java file in Android Studio.
2. In the onCreate() method of the activity, add the following code snippet:


3. This will hide the action bar from the main activity. However, if you want to remove the action bar from the entire app, you can add the same line of code to the onCreate() method of every activity in your app.

4. If you want to remove the action bar permanently from your app, you can do this by modifying the app theme in your styles.xml file. To do this, open the styles.xml file located in the res/values folder of your project.

5. In the styles.xml file, add the following line of code to the AppTheme style:

<item name="windowActionBar">false</item> 

This will remove the action bar from all activities in your app that use the AppTheme style.


You can set up the activity layout resource and Java code implementation for a BMI calculator with a standard look. Here’s an example:

1. Now open the activity_main.xml file located in the “res/layout” folder.
2. In the activity_main.xml file, add the following code to set up the layout for the BMI calculator that is to Designing BMI Calculator UI:

<?xml version="1.0" encoding="utf-8"?> <LinearLayout
android:text="BMI Calculator"
android:hint="Enter your weight in kg"
android:hint="Enter your height in cm" 


Finally, Your Java code implementation for the BMI calculator in

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity
private EditText editTextWeight;
private EditText editTextHeight;
private Button buttonCalculate;
private TextView textViewResult;
protected void onCreate(Bundle savedInstanceState)
editTextWeight = findViewById(;
editTextHeight = findViewById(;
buttonCalculate = findViewById(;
textViewResult = findViewById(;
buttonCalculate.setOnClickListener(new View.OnClickListener()
public void onClick(View v)
private void calculateBMI()
String weightStr = editTextWeight.getText().toString();
String heightStr = editTextHeight.getText().toString();
if (weightStr.isEmpty())
editTextWeight.setError("Please enter your weight");
editTextWeight.requestFocus(); return;
if (heightStr.isEmpty())
editTextHeight.setError("Please enter your height");
float weight = Float.parseFloat(weightStr);
float height = Float.parseFloat(heightStr) / 100;
float bmi = weight / (height * height);
String bmiResult = String.format("Your BMI is %.1f", bmi);
String bmiCategory = getBMICategory(bmi);
bmiResult = bmiResult + "\n" + bmiCategory;
private String getBMICategory(float bmi)
if (bmi < 18.5)
return "Underweight";
else if
(bmi < 25)
return "Normal weight";
else if (bmi < 30) 
return "Overweight"; 
return "Obese"; 

This code defines a MainActivity class that extends AppCompatActivity. The class includes private member variables for the EditText views for weight and height, the Button view for the calculate button, and the TextView view for the BMI result.
The onCreate() method initializes the member variables by finding them using their resource IDs. It also sets up an onClickListener for the calculate button that calls the calculateBMI() method when clicked.

The calculateBMI() method retrieves the weight and height values from the EditText views, checks if they are empty, converts them to floats, calculates the BMI value using BMI Calculation Formula, and creates a string with the BMI result and category. It then sets the text of the result TextView to the BMI string.
The getBMICategory() method takes the calculated BMI value as an argument and returns a string with the corresponding BMI category based on the standard classification system.

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Tic Tac Toe is a classic paper-and-pencil game for two players who take turns marking X’s and O’s in a 3×3 grid. The objective of the game is to be the first player to get three of their marks in a row, either horizontally, vertically, or diagonally according to the Tic Tac Toe Rules. In Android, it is common to pass data from one activity to another using an intent. An intent is a messaging object that is used to communicate between different components of an Android application, such as activities, services, and broadcast receivers. When developing Android applications, it is often necessary to pass data between different activities. One way to achieve this is by using a Bundle object. Bundles are used to store and pass data between different components of an application.  In Android, an ArrayList can be passed between activities using a Bundle object. A Bundle is a container that holds data and can be used to transfer data between activities.


The journey of creating a BMI Calculator using Android Studio has provided a fascinating insight into the realm of health and technology fusion. Throughout this comprehensive guide, we’ve explored the intricacies of developing an application that not only empowers users to monitor their health but also showcases the potential of mobile app development.

Designing and coding a BMI Calculator demonstrates the transformative power of programming, as it translates a seemingly complex health concept into a user-friendly application. From understanding the BMI formula to implementing user interfaces, the process reveals the synergy between health awareness and technology innovation.

By mastering the techniques illustrated in this guide, you’ve acquired the skills to offer users a valuable tool for assessing their body mass index. The BMI Calculator provides insights into the correlation between weight and height, contributing to a healthier lifestyle and informed decision-making.

Furthermore, the development of a BMI Calculator underscores your ability to create applications that bridge the gap between personal well-being and digital convenience. The amalgamation of algorithmic logic, user-centric design, and interactive features culminates in an application that facilitates easy health monitoring.

As you reflect on the journey of crafting the BMI Calculator in Android Studio, you’ve not only enhanced your programming skills but also contributed to the burgeoning field of health technology. This accomplishment serves as a stepping stone for further exploration, whether it involves refining the app’s features or venturing into other dimensions of software development.

In summation, the creation of a BMI Calculator in Android Studio showcases your aptitude for developing applications that address real-world concerns. The fusion of health science, programming, and design expertise results in an application that epitomizes the synergy between technology and well-being. You should take care for Input Validation and Error Handling in your app. As you embark on future coding endeavors, remember the significance of the lessons learned and the positive impact your BMI Calculator can have on users’ lives.

Q: 1. What is a BMI Calculator app?

A: The BMI Calculator app is a digital tool designed to help users estimate their body mass index (BMI) based on their weight and height measurements. It provides insights into whether a person’s weight is within a healthy range relative to their height.

Q: 2. Why create a BMI Calculator app in Android Studio?

A: Developing a BMI Calculator app in Android Studio enables you to merge health science and technology, offering users an accessible means of monitoring their health and making informed lifestyle choices.

Q: 3. What programming languages are involved in building a BMI Calculator app?

A: Creating a BMI Calculator app entails utilizing Java or Kotlin for Android app development, along with XML for defining the user interface.

Q: 4. Is a BMI Calculator app suitable for all users?

A: Yes, a BMI Calculator app is designed to be user-friendly and accessible for individuals seeking to understand their body mass index. It provides valuable insights regardless of one’s familiarity with health concepts.

Q: 5. What are the key components of a BMI Calculator app?

A: A BMI Calculator app typically includes input fields for weight and height, a button to calculate BMI, a display area for results, and potentially a classification of the BMI value (underweight, normal, overweight, etc.).

Q: 6. Can I customize the appearance of my BMI Calculator app?

A: Absolutely! You can personalize the user interface elements, such as colors, fonts, and layout, to give your BMI Calculator app a unique look that aligns with your app’s theme.

Q: 7. How can I ensure the accuracy of the BMI calculations in my app?

A: Ensuring accuracy involves implementing the BMI formula correctly and validating user inputs. Additionally, incorporating error handling and unit conversion (e.g., kilograms to pounds) enhances precision.

Q: 8. Are there any advanced features I can add to my BMI Calculator app?

A: Yes, you can consider integrating features like a historical log to track changes in BMI over time, personalized health tips, or even integration with wearable health devices for real-time data input.

Q: 9. What skills can I learn from developing a BMI Calculator app?

A: Developing a BMI Calculator app imparts knowledge in UI design, input validation, algorithm implementation, and data interpretation related to health metrics.

Q: 10. Why is testing crucial in BMI Calculator app development?

A: Thoroughly testing your BMI Calculator app is essential to ensure accurate calculations and user-friendly functionality, which are vital for an app intended to provide health insights.

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BMI is a numerical value derived from an individual’s weight and height measurements. In health Interpretations, we will gather user inputs for both height and weight, which will be stored in variables designated for height and weight. These inputs will be used for subsequent calculations. Are you familiar with the fundamentals of Java? Have you ever envisioned crafting your own applications? If so, this article is tailor-made for you! Armed with your foundational understanding of Java, we’re about to embark on the journey of crafting a straightforward Android app—an intuitive BMI Calculator. Within this tutorial, our focus will be on constructing an Android application designed to compute the Body Mass Index (BMI). The calculation will be contingent on the user’s input for both height and weight. The Body Mass Index (BMI), also known as the Quetelet index, is a numerical measure obtained from an individual’s weight and height measurements.

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