BMI Calculator
Calculate your BMI, healthy weight range, and estimated BMR.
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Normal weight |
| 25.0 – 29.9 | Overweight |
| 30.0 and above | Obese |
About BMI Calculator
Body Mass Index (BMI) is a simple screening measure that estimates body fat based on your height and weight. Our BMI Calculator supports both metric (centimeters and kilograms) and imperial (feet, inches, and pounds) units, so you can use whichever system you're comfortable with. Enter your height and weight and the tool instantly calculates your BMI, your weight category — Underweight, Normal weight, Overweight, or Obese, based on WHO thresholds — and the healthy weight range for your exact height. If you also enter your age and gender, it estimates your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation, the calories your body burns at rest before any activity is factored in. Keep in mind BMI is a general indicator and doesn't account for muscle mass, bone density, or body composition, so it's best used alongside other health measures.
Frequently Asked Questions
A BMI between 18.5 and 24.9 is generally considered a healthy weight range for most adults.
BMI is a useful general screening tool but doesn’t distinguish between muscle and fat, so it can be less accurate for athletes, older adults, or very muscular people.
BMI = weight (kg) / height (m)² in metric units, or weight (lb) / height (in)² × 703 in imperial units.
BMR (Basal Metabolic Rate) is the calories your body burns at rest just to function. This tool uses the Mifflin-St Jeor equation, which factors in weight, height, age, and gender since metabolic rate genuinely varies by all four.
The standard BMI formula and categories used here apply to adults. Children and teens use age- and gender-specific percentile charts instead.