Calculate your BMI using metric or imperial options to check weight thresholds.
Calculator Parameters
Enter details and click calculate to view the results instantly.
Calculation Examples
Scenario Inputs
Output Result
weight : 70, height : 175, system : metric
BMI Score: 22.86 (Normal Weight)
About BMI Calculator
Body Mass Index (BMI) Calculator. Calculate your BMI using metric or imperial options to check weight thresholds. Starlightopia provides this tool completely free and online, optimized for instant, accurate computations.
How It's Calculated
What is the formula for calculating BMI?
In metric units, BMI is calculated using the formula: BMI = weight (kg) / [height (m)]^2.
Technical Specifications
CategoryHealth
Target ValueBMI Score
Inputs Required (3)
Weight (kg / lbs) (number)
Height (cm / inches) (number)
Measurement System (select)
Frequently Asked Questions
What is the formula for calculating BMI?
In metric units, BMI is calculated using the formula: BMI = weight (kg) / [height (m)]^2.
What are the standard weight categories according to BMI ranges?
Underweight is a BMI below 18.5; normal weight is 18.5 to 24.9; overweight is 25 to 29.9; and obese is a BMI of 30 or higher.
Does BMI distinguish between muscle mass and body fat?
No, BMI only uses total weight and height, meaning it can classify heavily muscled athletes as overweight or obese.
Why is BMI used if it has accuracy limitations?
BMI is widely used because it provides a quick, inexpensive, and simple screening tool to assess health risks across large populations.
Are BMI target ranges the same for men and women?
Yes, standard adult BMI classifications apply equally to both men and women regardless of gender.