BMI Calculator – Body Mass Index and Healthy BMI
A BMI calculator gives your body mass index from your weight and height. BMI is used as a rough screen for underweight, normal, overweight, and obese ranges. This article explains how BMI is calculated and links to our BMI calculator.
Quick Answer
| Label | Value |
|---|---|
| Weight | 70 kg |
| Height | 170 cm |
| BMI | 24.2 |
How It Works
BMI = weight (kg) ÷ height (m)². Height in cm is converted to meters (÷ 100). For 70 kg and 170 cm: 70 ÷ (1.7)² ≈ 24.2. Normal range is often 18.5–24.9; under 18.5 underweight, 25–29.9 overweight, 30+ obese. BMI does not distinguish muscle from fat.
Additional Notes
BMI is a screening tool, not a diagnosis. For body composition, consider our Body Fat Calculator. Healthy BMI for men and women uses the same formula; interpretation may vary by population.
Use Our Calculator
Try our BMI Calculator for your own numbers: /calculators/bmi-calculator
Related Calculators
Generally 18.5–24.9 is considered normal. Ranges may vary by age and population.
The formula is the same. Interpretation and healthy ranges can differ.
BMI is weight divided by height squared. It doesn't separate muscle from fat, so very muscular people can have a high BMI.