Free Body Fat Calculator 2026 – Body Fat %, Lean Mass & Fat-Loss Plan

See beyond the scale with BurnLogic's free body fat calculator. Estimate your body fat percentage, fat mass, and lean body mass using simple measurements—height, weight, waist, neck, and hip. Get your Body Composition Score™, Goal Difficulty Scale™, and personalized fat-loss timeline instantly. Unlike BMI, body fat percentage reveals your true health and fitness level. Whether you're 15% or 35% body fat, get realistic recommendations for fat loss, body recomposition, or muscle gain. Track progress every 2–4 weeks. Free, accurate, and no signup required. Know your body composition today.