Utility ToolsFree

BMI Calculator

Calculate your Body Mass Index (BMI) from height and weight. Shows your BMI score, health category (underweight, normal, overweight, obese), and the healthy weight range for your height. Supports both metric (kg/cm) and imperial (lbs/inches) units.

Frequently Asked Questions

How is BMI calculated?▼
BMI = weight (kg) ÷ height² (m²). For imperial units, BMI = (weight (lbs) ÷ height² (inches²)) × 703.
What are the BMI categories?▼
Underweight: below 18.5. Normal weight: 18.5–24.9. Overweight: 25–29.9. Obese Class I: 30–34.9. Obese Class II: 35–39.9. Obese Class III: 40 and above.
Is BMI an accurate health indicator?▼
BMI is a useful screening tool for population-level health trends but does not account for muscle mass, bone density, or fat distribution. Athletes often have high BMI despite being very healthy.
Does it support metric and imperial?▼
Yes. Toggle between kg/cm (metric) and lbs/inches (imperial) — the calculation adjusts automatically.
What is the healthy BMI range?▼
18.5 to 24.9 is considered the normal/healthy range for most adults according to WHO guidelines.