BMI Calculator

Calculate your Body Mass Index and learn what it means for your health and fitness goals.

Calculate Your BMI

Enter your height and weight to calculate your Body Mass Index. BMI is a screening tool that provides a general indication of whether your weight falls in a healthy range.

Understanding Your BMI

BMI RangeCategoryWhat It Means
Below 18.5UnderweightMay benefit from strength training and nutrition guidance to build lean mass
18.5 - 24.9NormalHealthy range — maintain with regular exercise and balanced nutrition
25.0 - 29.9OverweightMay benefit from combined training and nutrition program for fat loss
30.0+ObeseProfessional guidance recommended — safe, progressive training program

Note: BMI is a screening tool, not a diagnostic measure. It does not account for muscle mass, bone density, age, or sex. Consult a healthcare professional for a comprehensive health assessment.

BMI FAQ

What is BMI and how is it calculated?
Body Mass Index (BMI) is a calculation using height and weight. The formula is weight in kilograms divided by height in meters squared. For imperial units, it is weight in pounds divided by height in inches squared, multiplied by 703. BMI is a screening measure and does not directly measure body fat.
Is BMI an accurate measure of health?
BMI is a useful screening measure, but it does not distinguish between muscle and fat or account for every individual health factor. Trevor Cassidy recommends considering it alongside measurements such as waist circumference, body composition, health history, and functional fitness.
What BMI is considered healthy?
For adults, the CDC classifies a BMI from 18.5 to below 25 as healthy weight, 25 to below 30 as overweight, and 30 or higher as obesity. These categories are screening ranges rather than a diagnosis of individual health.
How can a personal trainer support healthier body composition?
A personal trainer can build a program around your current fitness, goals, movement ability, and schedule. Trevor Cassidy combines progressive resistance training, conditioning, nutrition guidance, and ongoing accountability, then adjusts the program using your recorded progress.

Want to Improve Your Body Composition?

BMI is just the start. Book a free consultation with Trevor Cassidy for a comprehensive fitness assessment and customized training plan.

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By Trevor Cassidy Published Last updated

Sources

  1. 1. Adult BMI Categories — Centers for Disease Control and Prevention
Trevor Cassidy, NASM-certified personal trainer

About the author

Trevor Cassidy

Trevor Cassidy is a NASM Certified Personal Trainer, Corrective Exercise Specialist, Performance Enhancement Specialist, and Certified Nutrition Coach with more than 13 years of coaching experience. He is also a former professional rugby player.

Credentials and experience