BMI Calculator
Calculate your Body Mass Index (BMI) and see which weight category you fall into.
Body Mass Index Calculator
Your Result
How BMI Is Calculated
Body Mass Index (BMI) is a simple screening measure that estimates whether your weight is healthy relative to your height. It's calculated by dividing your weight by the square of your height, and it's used by doctors and health organizations worldwide as a quick, free first indicator of possible weight-related health risk.
Metric formula
BMI = weight (kg) ÷ height (m)²
Imperial formula
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 — Obese
Keep in mind BMI doesn't distinguish between muscle and fat, so athletes and very muscular people may show a higher BMI without extra body fat. It's a useful starting point, not a full diagnosis — talk to a healthcare provider for a complete picture of your health.
Frequently Asked Questions
Is BMI accurate for everyone?
BMI is a useful general screening tool but it doesn't account for muscle mass, bone density, age, or sex distribution of fat, so it can be less accurate for athletes, older adults, and pregnant women.
What is a healthy BMI range?
For most adults, a BMI between 18.5 and 24.9 is considered a healthy weight range, according to major health organizations.
Does this calculator store my data?
No. The calculation runs entirely in your browser and nothing you enter is uploaded or saved.