BMI Calculator
Body mass index with CDC ranges and your healthy weight window.
Enter your height and weight — get your BMI, the CDC category, and the weight window that corresponds to a healthy range for your height.
How this is calculated
Methodology & sources
- Formula: Body mass index = weight(kg) / height(m)² — CDC, About Adult BMI
- Categories: Healthy weight 18.5–24.9 · Above 25–29.9 · 30+ — CDC BMI categories
- Height-adjusted BMI (New BMI): Trefethen LN. "New BMI = 1.3 × weight(kg) / height(m)^2.5" — Mathematical Institute, University of Oxford (2013)
- Known limits: WHO — obesity and overweight (BMI as a population screening tool)
Privacy — how your data is handled
All math runs in your browser on your device. Nothing you type is sent to a server,
and saved results live only in this browser's local storage. Tools that use live
public data (food databases, weather) request only what they need to display.
👟 Practical toolkit tip — Simple Pocket Pedometer or Wrist Step Counter
Why it helps: Tracking daily step volume (7,500–10,000 steps/day) prevents subconscious NEAT drop-off when you are in a calorie deficit.
Pro tip: A 15-minute brisk walk after dinner adds ~1,600 steps and blunts post-meal blood glucose spikes.