BMI - Body Mass Index
Estimate your Body Mass Index (BMI) from height and weight. Add waist for a stronger health signal (WHtR).
lb
in
in
BMI:
BMI Category:
Waist-to-Height Ratio (WHtR)
Enter waist + height to calculate.
Note: BMI can misclassify muscular people. WHtR often tracks health risk better. A common target is < 0.5.
This calculator estimates your BMI (Body Mass Index) — a simple height-to-weight screening metric. BMI can be useful for broad population-level comparisons, but it does not directly measure body fat or muscle.
What BMI measures (and what it doesn’t)
- Measures: weight relative to height (a rough risk-screening tool).
- Doesn’t measure: body fat %, muscle mass, bone density, or where you store fat.
How to use it
- Enter your height and weight.
- Click Calculate to get your BMI and category (if shown).
- Use BMI as a general reference — not as your only progress metric.
BMI categories (general reference)
- Underweight: below 18.5
- Normal weight: 18.5–24.9
- Overweight: 25.0–29.9
- Obesity: 30.0 and above
Important note for lifters
If you lift and carry more muscle, BMI can label you as “overweight” even when your body fat is reasonable. For a better picture, use BMI alongside waist measurements, body fat % estimates, and progress photos.
What to use instead (if you want more precision)
- Body Fat % / LBM: better for tracking composition changes.
- Waist measurement: simple, high-signal health/progress metric.
- Scale trend + performance: weekly averages + strength progression.
Note: Estimates for informational purposes only, not medical advice.