Estimate body fat percentage using Navy, BMI-based, or manual inputs to understand fat vs lean mass.
DEXA and hydrostatic weighing are most accurate, but the Navy method is a practical, reliable option for most people.
Every 2–4 weeks is typical; consistency matters more than frequency.
Calculate your Body Mass Index to assess your weight relative to height.
Try calculator →Determine body frame size using height and wrist circumference.
Try calculator →Assess health risk using A Body Shape Index.
Try calculator →Estimate lean body mass based on height and weight.
Try calculator →Learn how calories drive maintenance, loss, and gain.
Explore guide →Set protein, carb, and fat targets with confidence.
Explore guide →Understand BMI, body fat, and lean mass metrics.
Explore guide →Use heart-rate zones to train smarter.
Explore guide →