Use this body fat percentage calculator to turn seven skinfold caliper measurements into an estimated body-fat percentage, fat mass, and lean mass. Take three readings at each site, enter the average in millimeters, and use the same method every time you remeasure.
For adults 18 and older. Enter the average of three caliper readings at each site in millimeters.
This calculator uses the Jackson–Pollock seven-site skinfold equation. It combines your age with the total of chest, abdomen, suprailiac, midaxillary, tricep, subscapular, and thigh caliper readings to estimate body density, then converts that estimate into body-fat percentage.
It is a field estimate, not a medical diagnosis. The most useful result is a consistent trend over time: take your measurements under the same conditions, with the same tool, using the same sites.
For the most consistent skinfold data, a trained professional is helpful. At-home calipers are most valuable when you use the method consistently rather than expecting a perfect one-time number.
| Site | General location |
|---|---|
| Chest | Diagonal fold between the armpit and nipple area. |
| Abdomen | Vertical fold beside the navel. |
| Suprailiac | Diagonal fold above the hip bone. |
| Midaxillary | Vertical fold below the middle of the armpit. |
| Tricep | Vertical fold at the back of the upper arm. |
| Subscapular | Diagonal fold below the shoulder blade. |
| Thigh | Vertical fold midway between hip and knee. |
Do not let one estimate dictate a crash diet or extreme training change. Use body-fat trend, waist measurement, body weight, gym performance, and recovery together. If fat loss is your goal, use the TDEE calculator to set a sustainable calorie starting point and follow a repeatable training plan.
Start with the 3-day full-body plan or 4-day upper/lower plan, then adjust based on your real progress.
Calipers can be useful for estimating change over time, especially when the same person uses the same tool and method consistently. They are not a substitute for clinical assessment.
Every two to four weeks is enough for most people. Daily or weekly changes are often too small to interpret reliably.
No. This calculator needs seven skinfold readings in millimeters. For a circumference-based estimate, use a dedicated Navy-style body-fat calculator.
This tool is not for people under 18, pregnancy or breastfeeding, eating-disorder recovery, or medical conditions affecting body composition. Use individualized guidance from a qualified clinician in those situations.
Use the body-fat percentage calculator to track your trend, not to chase a perfect single number. Consistent readings, strong workouts, and sustainable nutrition are the signals that matter.
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