BMI & Age
Calculator
Two essential daily tools trusted by thousands. Get your Body Mass Index score and exact age instantly — 100% free, works on any device.
Calculate Your BMI
Body Mass Index based on your height & weight
📋 BMI Categories Reference
World Health Organization (WHO) standard| BMI Range | Category | Health Risk |
|---|---|---|
| Below 18.5 | Underweight | Malnutrition risk |
| 18.5 – 24.9 | Normal Weight ✅ | Lowest risk |
| 25.0 – 29.9 | Overweight | Moderate risk |
| 30.0 – 34.9 | Obese Class I | High risk |
| 35.0 – 39.9 | Obese Class II | Very high risk |
| 40.0+ | Obese Class III | Extremely high risk |
Frequently Asked Questions
Everything you need to know about BMI and age calculation
A healthy BMI falls between 18.5 and 24.9. This range is associated with the lowest health risk for most adults. However, BMI is just one indicator — muscle mass, age, ethnicity, and other factors also matter when assessing overall health.
BMI doesn't distinguish between muscle and fat, so athletes or very muscular people may show a high BMI without being overweight. It's best used alongside other measures like waist circumference and body fat percentage for a complete picture.
BMI = weight (kg) ÷ height² (m²). For example, a person weighing 70kg at 170cm has a BMI of 70 ÷ (1.7 × 1.7) = 24.2, which falls in the normal/healthy range.
Simply enter your date of birth in the Age Calculator tab. Our tool will instantly show your exact age in years, months, days, weeks, and hours — along with your next birthday countdown, zodiac sign, and fun life facts.
A BMI of 30 or above is classified as obese. Class I is 30–34.9, Class II is 35–39.9, and Class III (severe obesity) is 40+. Consulting a healthcare professional is strongly recommended if your BMI falls in these ranges.
Standard BMI calculations are designed for adults (18+). For children and teenagers, BMI is interpreted differently using age- and sex-specific percentile charts. Always consult a paediatrician for children's health assessments.