BMI — Quick 8‑Section Guide
Fast way to interpret your Body Mass Index correctly and use it alongside other metrics.
1) Core idea
- Metric: BMI = weight(kg) / height(m)²
- US: BMI = 703 × weight(lb) / height(in)²
2) Flow
- Enter age, gender, height, weight → we convert exactly (1 in = 2.54 cm; 1 lb = 0.45359237 kg)
- We compute BMI and map it to WHO categories
3) Sanity checks
- Height > 0; weight > 0; realistic adult ranges
- Gauge capped to 0–50 BMI for legibility
4) Shortcuts
- Toggle cm ↔ ft/in and kg ↔ lb in‑place
- US mode uses the exact 703 factor
5) Pitfalls
- Muscle vs fat: BMI can label athletes as overweight
- Children/elderly: use age‑specific tools
6) Micro examples
- 70 kg, 175 cm → 70 / 1.75² = 22.9
- 154 lb, 69 in → 703×154/69² ≈ 22.7
7) Mini‑FAQ
- Healthy adult range: 18.5–25 kg/m²
- Better with context: pair with Body Fat and TDEE
8) Action tip
If your BMI is borderline, check body‑fat % and waist‑to‑height ratio before making big diet or training changes.