Use our free BMI Calculator to check your Body Mass Index instantly. Enter your height and weight to see which weight category you fall into. No signup required.
Calculate Your BMI
How to Use This BMI Calculator
- Enter your height in centimeters.
- Enter your weight in kilograms.
- Click Calculate BMI to see your result instantly.
- Check your weight category in the table below.
BMI Formula
BMI is calculated as weight divided by height squared:
BMI = weight (kg) ÷ [height (m)]²
| BMI Range | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Normal weight |
| 25.0 – 29.9 | Overweight |
| 30.0 and above | Obese |
Worked Examples
Example 1
Height 175 cm (1.75 m), weight 70 kg. BMI = 70 ÷ (1.75 × 1.75) = 70 ÷ 3.0625 = 22.9 (Normal weight).
Example 2
Height 160 cm (1.60 m), weight 80 kg. BMI = 80 ÷ (1.60 × 1.60) = 80 ÷ 2.56 = 31.3 (Obese).
Frequently Asked Questions
What is a healthy BMI?
A BMI between 18.5 and 24.9 is considered the healthy range for most adults.
Is BMI accurate for athletes?
BMI does not distinguish muscle from fat. Very muscular people may have a high BMI without excess body fat. Athletes should also consider body fat percentage.
How often should I check my BMI?
Checking monthly is enough to track trends. Daily fluctuations are normal and not meaningful.
About the author: The DaProfitClub health tools team builds free calculators reviewed against WHO BMI classifications.
Sources: World Health Organization (WHO) BMI classifications. Last reviewed: September 2026.
Disclaimer: This calculator is for educational purposes only and does not constitute medical advice. Consult a healthcare professional for personalized guidance.