Calculate your BMI using height and weight in U.S. or metric units. See your adult BMI category and healthy-weight range in seconds.
Enter your height and weight to calculate Body Mass Index (BMI), view the adult category, and see the estimated healthy-weight range for your height.
Body Mass Index is a height-and-weight screening measure. For adults, it helps categorize weight relative to height, but it does not directly measure body fat, muscle mass, fitness, or health status. Use it as one signal—not the whole story.
Metric formula: BMI = weight in kilograms ÷ height in meters squared. U.S. formula: BMI = 703 × weight in pounds ÷ height in inches squared.
For example, a person who weighs 175 pounds and is 5 feet 10 inches tall has a BMI of about 25.1.
| Category | BMI range |
|---|---|
| Underweight | Below 18.5 |
| Healthy weight | 18.5–24.9 |
| Overweight | 25.0–29.9 |
| Obesity | 30.0 and above |
These are adult screening categories used by the CDC. Children and teens use age- and sex-specific BMI percentiles rather than the adult ranges.
BMI is useful for quickly tracking a height-to-weight trend, but it cannot distinguish muscle from fat. That matters at Tiger Fitness: a muscular lifter may land in a higher BMI category without having excess body fat. Pregnancy, rapid weight changes, medical conditions, body-fat distribution, and individual history also need more context than this calculator can provide.
Pair BMI with performance, waist measurements, progress photos, training consistency, and guidance from a qualified healthcare professional when you need a fuller picture.
Use your result as a starting point, then focus on controllable habits: consistent resistance training, a nutrition approach you can sustain, sufficient protein, daily movement, and recovery. If your goal is to lose fat, gain muscle, or maintain weight, calculate your daily calorie needs with our TDEE calculator.
The adult BMI formula and standard categories are the same for men and women. Body composition can differ, which is one reason BMI should not be used alone.
For adults age 20 and older, a BMI from 18.5 to 24.9 is categorized as healthy weight by the CDC.
Yes, but with caution. BMI does not separate lean mass from fat mass, so athletes and muscular lifters may receive a higher result that does not reflect their body composition.
No. For ages 2 through 19, BMI must be interpreted using age- and sex-specific percentiles. Use a pediatric tool or speak with a healthcare professional.
No. BMI is a screening measure, not a diagnosis. Consult a qualified healthcare professional for personal medical advice.
Calculate your BMI, use it as one useful checkpoint, then build your plan around sustainable nutrition, training, recovery, and progress you can feel. Fuel your goals and keep moving forward.
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