Work out body fat (skinfold 7 site) instantly with clear inputs, formula shown and shareable results.
The seven-site Jackson-Pollock protocol uses chest, midaxillary, triceps, subscapular, abdomen, suprailiac and thigh folds. Its wider sampling makes it more reliable than three-site versions for people with unusual fat distribution. A 95 mm sum at 32 gives a density near 1.0619 and about 16.4% fat for a man.
JP 7-site density, men
D = 1.112 - 0.00043499 S + 0.00000055 S^2 - 0.00028826 x age
JP 7-site density, women
D = 1.097 - 0.00046971 S + 0.00000056 S^2 - 0.00012828 x age
These figures are population-average estimates, not a medical assessment or diagnosis. Body composition equations carry errors of several percentage points, and healthy ranges vary with age, ethnicity, muscularity and medical history. Discuss weight or body composition goals with a qualified clinician or dietitian.
Yes for atypical fat distribution, since averaging more locations reduces the effect of any single unusual site. For most people three sites is within a percentage point.
A calibrated spring caliper such as Harpenden or Lange. Plastic calipers apply inconsistent pressure and add error.