HEALTH / FITNESS
BMI Calculator
Estimate adult BMI from height and weight in metric or imperial units, then review the standard screening category and weight range for the entered height.
Set your BMI inputs
Use the unit system that matches the height and weight you enter.
BMI estimate
Your estimate will appear here
Enter height, weight, and units, then calculate to see BMI, category, and the corresponding range.
Use BMI as a screening starting point
BMI is weight relative to height. This page uses standard adult screening bands and reports the weight range associated with BMI 18.5 to 24.9 for the entered height; it does not diagnose a condition or describe body composition completely.
Metric and imperial formulas
Metric mode uses weight in kilograms divided by height in meters squared. Imperial mode applies the standard 703 conversion to pounds and inches.
Know the boundary
The category guide is intended for adults. Children and teens use BMI-for-age methods, and individual health decisions need more context than a single number.
Frequently Asked Questions
What does this BMI calculator show?
It estimates body mass index from height and weight, identifies the corresponding standard adult BMI category, and shows the weight range associated with BMI 18.5 to 24.9 for that height.
Which units can I use?
Choose metric for height in centimeters and weight in kilograms, or imperial for height in inches and weight in pounds.
Does age change the BMI result?
The optional age field is displayed for context but does not change this calculation. This page uses standard adult BMI screening bands and is not a child or teen BMI-for-age calculator.
Is BMI a diagnosis?
No. BMI is a screening measure and one health indicator, not a diagnosis or a complete assessment of body composition or health.
What should I do with the result?
Use it as general information and discuss questions about your BMI or health with a qualified healthcare professional.