⚕️ BMI Calculator
Calculate your Body Mass Index (BMI) to check whether your weight falls in a healthy range for your height.
Your Measurements
Your Result
| Category | BMI Range |
|---|---|
| Underweight | Below 18.5 |
| Normal weight | 18.5 – 24.9 |
| Overweight | 25 – 29.9 |
| Obesity | 30 and above |
BMI is a screening tool, not a diagnostic tool. It does not account for muscle mass, bone density, or body composition. Consult a healthcare provider for a full assessment.
How the BMI Calculator Works
Body Mass Index (BMI) is a simple screening measure that uses your height and weight to estimate whether you're in a healthy weight range. It's calculated the same way for adults regardless of age or sex.
Formula
Imperial: BMI = 703 × weight (lb) / [height (in)]²
BMI Categories (Adults)
- Below 18.5 — Underweight
- 18.5–24.9 — Normal weight
- 25–29.9 — Overweight
- 30 and above — Obesity
Limitations of BMI
BMI does not directly measure body fat and can be less accurate for athletes with high muscle mass, older adults, and pregnant women. It's best used as a general screening tool alongside other health measures like waist circumference and body fat percentage.
Frequently Asked Questions
What is a healthy BMI?
For most adults, a BMI between 18.5 and 24.9 is considered a healthy weight range, according to the CDC and WHO.
Is BMI accurate for everyone?
BMI is a useful general screening tool but can be less accurate for athletes, bodybuilders, elderly people, and pregnant women because it doesn't distinguish between fat and muscle mass.
How is BMI different for children?
Children and teens are assessed using age- and sex-specific BMI percentiles rather than the fixed adult categories used in this calculator.