How is BMI computed?
BMI = weight (kg) ÷ height (m)². E.g. 60 ÷ 1.7² = 20.8 — input height and weight for auto calculation and rating.
What is the normal range?
Chinese standard: 18.5-23.9 normal, 24-27.9 overweight, ≥28 obese; WHO: 18.5-24.9 normal.
Is high BMI always unhealthy?
BMI is a reference; athletes with high muscle mass may score high — combine with body fat and waist.
Is online calculation safe?
Safe — runs locally; height and weight never upload.
What is it best for?
Self-checks, weight-loss tracking, before/after fitness and health management.
Are there limits on free use?
No. Free, no registration, unlimited.
Is it for children?
Children need pediatric growth charts; this tool targets adults.
Does it give health tips?
Yes — diet and exercise advice per category, e.g. more nutrition for underweight.