BMI Calculator
Find your Body Mass Index, category and healthy weight range in US or metric units.
Your Measurements
Understanding Your BMI
Body Mass Index (BMI) is a simple screening measurement based on your height and weight. It's used by doctors and health organizations worldwide as a quick indicator of whether your weight falls in a typical range for your height.
- Below 18.5 — Underweight
- 18.5 – 24.9 — Normal weight
- 25.0 – 29.9 — Overweight
- 30.0 and above — Obese
BMI is a general screening tool, not a diagnosis. It doesn't account for muscle mass, bone density, age or sex, and isn't intended for athletes, pregnant women or children. Always talk to a healthcare provider for personalized advice.
Frequently Asked Questions
In metric units, BMI = weight in kilograms divided by height in meters squared. In US units, BMI = 703 × weight in pounds divided by height in inches squared.
For most adults, a BMI between 18.5 and 24.9 is considered a healthy weight. Below 18.5 is underweight, 25-29.9 is overweight, and 30 or above is considered obese.
BMI is a general screening tool and doesn't directly measure body fat. It may not accurately reflect health for athletes with high muscle mass, older adults, pregnant women, or children. Always consult a healthcare provider for a personalized assessment.