BMI Calculator

BMI Calculator computes Body Mass Index based on weight and height. Ideal for health assessments, fitness tracking, and personal wellness planning.

Weight (kg):

Height (m):

About the BMI Calculator

The BMI Calculator computes Body Mass Index based on weight and height, providing insights into health status. It supports metric (kg/m) and imperial (lb/in) units, making it ideal for fitness tracking, health assessments, and personal wellness planning.

Enter values using the number buttons or keyboard input.
Input weight and height in the desired unit system (toggle between metric and imperial).
Press Calculate to view BMI, category, health implications, and ideal weight range.
Use Clear to reset inputs to empty or Backspace (⌫) to delete the last character.

How to Use the BMI Calculator

Follow these steps:

Select Unit: Click Unit Toggle to switch between metric (kg/m) and imperial (lb/in).
Enter Data: Input weight and height in the respective fields, overwriting or clearing defaults.
Enter Value: Use number buttons (0-9, 00, .) or keyboard to input values.
Correct Input: Use Backspace (⌫) to delete the last character or clear the field.
Calculate: Press the “Calculate” button to display the result.
Clear or Reset: Use “Clear” to empty all inputs.

Notes:

Ensure inputs are valid numbers (decimals supported; negative values are invalid).
Default weight is 70 kg (154 lb), and height is 1.75 m (69 in), but can be cleared.
Keyboard support: Numbers, decimal point, Enter for calculation, Backspace to delete characters.

BMI Calculation Explained

BMI is calculated as weight divided by the square of height:

Metric:
\( \text{BMI} = \frac{\text{Weight (kg)}}{\text{Height (m)}^2} \)

Imperial:
\( \text{BMI} = \frac{\text{Weight (lb)} \times 703}{\text{Height (in)}^2} \)

BMI Categories (WHO):

Underweight: BMI < 18.5
Normal: BMI 18.5–24.9
Overweight: BMI 25–29.9
Obesity: BMI ≥ 30

Assumptions:

Results are rounded to two decimal places.
Ideal weight range is calculated for BMI 18.5–24.9.
Inputs must be positive numbers; empty inputs are invalid.

Example Calculation

Calculate BMI for a person weighing 70 kg and 1.75 m tall:

Ensure Metric Units: Unit Toggle set to Metric.
Enter Data: Clear defaults and set weight to 70 kg, height to 1.75 m.
Calculate: Press “Calculate”.
BMI: \( \frac{70}{1.75^2} = \frac{70}{3.0625} \approx 22.86 \)
Category: Normal
Ideal Weight Range: \( 18.5 \times 3.0625 \approx 56.66 \, \text{kg} \) to \( 24.9 \times 3.0625 \approx 76.39 \, \text{kg} \)
Health: Within healthy range
Result: BMI: 22.86 (Normal, healthy range).

Available Features

Unit Systems: Metric (kg/m) and Imperial (lb/in).
Inputs: Weight and height with decimal support, fully clearable.
Results: BMI value, category, health implications, ideal weight range.
Backspace: Delete the last character or clear the input field.
Sharing: Share via Facebook, WhatsApp, or X.com.
Embedding: Copy embed code for external sites via the Embed share button.
Copy Answer: Copy calculation results to clipboard.

Calculator Functionality

Error Handling: Validates inputs and displays errors for empty or invalid inputs.
Result Formatting: Rounds to two decimal places.
Responsive Design: Adapts to all screen sizes.
Accessibility: Includes ARIA attributes and keyboard support.

Applications: