BMI Calculator

Calculate your Body Mass Index (BMI) using your height and weight. See your BMI score and health category — underweight, normal, overweight, or obese.

Part of our Health Calculators collection.

BMI Calculator

Free online calculator

Units

Weight (lbs)

Height – Feet

Height – Inches

Weight (kg)

Height (cm)

How to Use This Calculator

1
Select your preferred unit system.
2
Enter your weight and height.
3
View your BMI score and health category instantly.

BMI Formula

Imperial: BMI = (weight in lbs × 703) / (height in inches)²
Metric:   BMI = weight in kg / (height in meters)²

Underweight < 18.5 | Normal 18.5–24.9 | Overweight 25–29.9 | Obese ≥ 30

Example Calculation

Example: 5′10″, 160 lbs

Inputs

units: imperialweightLbs: 160heightFt: 5heightIn: 10

Result

BMI 22.9 – Normal Weight

(160 × 703) / (70)² = 22.9 — Normal Weight range (18.5–24.9).

Frequently Asked Questions

Is BMI an accurate health measure?

BMI is a useful screening tool but doesn't distinguish muscle from fat. Use it alongside other health metrics.

What is a healthy BMI?

For adults: 18.5–24.9 is normal, 25–29.9 is overweight, 30+ is obese.