BMI Calculator
Calculate your Body Mass Index (BMI) instantly. Supports US (imperial) and metric units. Get your BMI score, health category, healthy weight range, and more.
BMI Calculator
Body Mass Index — Adults
Your BMI
23.6
✓ Normal Weight| Category | BMI Range | Status |
|---|---|---|
| Underweight | < 18.5 | — |
| Normal Weight | 18.5 – 24.9 | ✓ You |
| Overweight | 25.0 – 29.9 | — |
| Obese | 30.0 and above | — |
125 – 169 lbs
Healthy Weight Range
0.95
BMI Prime
13.5
Ponderal Index
None ✓
Weight to Lose/Gain
📊 BMI Categories Chart
What is BMI?
Body Mass Index (BMI) is a numerical value calculated from your height and weight. Widely used by healthcare professionals as a quick screening tool, BMI categorizes individuals into weight status categories — underweight, normal weight, overweight, and obese. While BMI is not a perfect measure of body fat, it is a useful starting point for assessing weight-related health risks. For a more complete picture, also try our body fat calculator and calorie calculator.
📐 BMI Formula
US/Imperial: BMI = 703 × weight(lb) ÷ height(in)²Metric: BMI = weight(kg) ÷ height(m)²Both formulas produce the same result when units are consistent. Example: 5'9", 160 lbs → BMI ≈ 23.6.
⚠️ Limitations of BMI
- Athletes: may register high BMI from muscle mass, not fat
- Elderly: can have a normal BMI but high body fat from muscle loss
- Pregnancy: BMI is not applicable during pregnancy
- Children: need age-and-sex-specific growth charts, not adult BMI
- Ethnicity: some populations carry higher health risk at lower BMI values
🌱 Maintaining a Healthy BMI
- Balanced diet: whole foods, vegetables, lean protein, healthy fats
- Regular exercise: at least 150 minutes of moderate activity per week
- Strength training: builds muscle and raises resting metabolism
- Sleep: poor sleep raises hunger hormones and promotes weight gain
- Stress management: chronic stress drives cortisol-related weight gain
📊 BMI vs Other Measurements
- Waist-to-hip ratio: often a better predictor of cardiovascular risk than BMI alone
- Body fat %: the most direct measure of composition — see our body fat calculator
- Waist circumference: over 40in (men) or 35in (women) signals elevated risk
- BMR: know how many calories your body burns at rest with our BMR calculator
— FAQ