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💪 Body Fat Calculator

Estimate adult body-fat percentage using Deurenberg BMI-based and U.S. Navy (Hodgdon-Beckett) formulas with metric and imperial inputs. Returns ACE category, fat mass, lean mass, FFMI, and a Jackson-Pollock ideal body-fat reference. For general information only; not medical advice.

This adult body-fat estimator is for general information only. It estimates percentage from body measurements and is not a substitute for professional body-composition testing (DEXA, BIA, hydrostatic weighing).

Results on this page are not medical advice, a diagnosis, or individualized nutrition guidance. They are not intended for minors, pregnancy, lactation, athletes, or people with unusual muscle mass.

Privacy note: Calculations run locally by default. Your age, height, weight, and circumference measurements are not uploaded.

How to measure correctly
  • Neck: measure just below the larynx at the narrowest point, tape horizontal and snug but not compressed.
  • Waist: men — around the navel; women — narrowest point between ribs and hips.
  • Hip: around the widest part of the hips; female measurement only.
  • Measure in the morning, fasted, standing naturally, without holding breath. Tape should touch skin without compressing it.

Numbers accept ASCII digits and an optional period (no comma). Age 18-120 whole; other fields must be positive and within sensible ranges.

Navy formula typical SD ~3-4%. BMI-based method is unreliable for athletes or people with unusual muscle mass.

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Free body fat calculator with metric and imperial inputs. Estimates adult body-fat percentage using Deurenberg BMI-based and U.S. Navy (Hodgdon-Beckett) formulas, returning ACE category, fat mass, lean mass, FFMI, and a Jackson-Pollock ideal body-fat reference. For general information only; not medical advice, a diagnosis, or individualized nutrition guidance.