AtlasCalcBMI Calculator – Calculate Your Body Mass Index
Body Mass Index (BMI) is a quick screening measure relating weight to height. Enter your weight and height below — the calculation runs locally in your browser.
Enter values and press Calculate — the result appears here.
BMI = weight(kg) / height(m)²
- weight
- Body weight (kg or lb)
- height
- Height (cm or in)
BMI is a population-level screening tool. It doesn't distinguish muscle from fat, so athletes and very muscular people can score 'overweight' while being healthy.
Example: 70 kg, 1.75 m → 70 / 1.75² = 22.86 (normal)
Ref: WHO classification (18.5–24.9 normal, 25–29.9 overweight, 30+ obese)
- 💡 BMI is a screening tool, not a diagnosis. Athletes with high muscle mass often score 'overweight' while being perfectly healthy.
- 💡 For Asian populations, a BMI of 23+ is sometimes used as the overweight cutoff due to higher metabolic risk at lower weights.
- 💡 Track your BMI over time — a single value is less useful than the trend.
FAQ
Is BMI accurate?
BMI is a useful population-level indicator but doesn't distinguish fat from muscle. Use it alongside waist circumference and body-fat percentage for a fuller picture.
What's a healthy BMI?
The WHO defines 18.5–24.9 as normal, 25–29.9 as overweight, and 30+ as obese. Children and teens use age- and sex-specific percentiles.