Jackson & Pollock 3-Site Fat Caliper Calculator
Enter your skinfold measurements in millimeters (mm). The calculator uses a validated 3-site equation to estimate body fat percentage.
Male sites: chest, abdomen, thigh. Pinch skinfold vertically (except chest, diagonal) and measure 1 cm below your fingers.
Tip: Take 2–3 readings at each site and enter the average for best accuracy.
What this fat caliper body fat calculator does
This tool estimates your body fat percentage using skinfold caliper measurements and the Jackson & Pollock 3-site method. It first estimates body density from your age and skinfold sum, then converts that density to body fat percentage with the Siri equation.
Unlike scale-based methods that can jump around with hydration changes, caliper tracking is usually more useful for following trends over time—especially if you measure the same way each week.
How to measure skinfolds correctly
General rules
- Use the same caliper each time.
- Measure on dry skin (no lotion/sweat).
- Take measurements on the right side of the body.
- Pinch firmly with thumb and index finger, then place caliper 1 cm below the pinch.
- Read the value after 1–2 seconds, not immediately.
- Take 2–3 readings per site and use the average.
Measurement sites for men (3-site method)
- Chest: Diagonal fold halfway between armpit and nipple.
- Abdomen: Vertical fold 2 cm to the right of navel.
- Thigh: Vertical fold midway between hip crease and kneecap.
Measurement sites for women (3-site method)
- Triceps: Vertical fold at back of upper arm, midway between shoulder and elbow.
- Suprailiac: Diagonal fold just above the hip bone.
- Thigh: Vertical fold midway between hip crease and kneecap.
Understanding your result
Your estimated body fat percentage is only as good as your measurement quality. A single result is less important than the trend over several weeks. If your number drops steadily while strength and energy stay stable, your plan is likely working.
- Essential fat: Minimum needed for normal physiological function.
- Athletic/Fitness ranges: Common for highly active individuals.
- Average range: Typical in the general population.
- Obesity range: Elevated health risk in most cases.
Common mistakes that skew caliper readings
- Measuring at slightly different landmarks each session.
- Not maintaining the pinch while taking the reading.
- Taking readings right after training (fluid shifts can affect values).
- Using too much pressure or waiting too long before reading the caliper.
- Comparing your result to someone using a different method (DEXA, BIA, Navy formula, etc.).
How often should you test?
For most people, once every 1–2 weeks is ideal. Daily testing creates noise and can be discouraging. Test at the same time of day, under similar hydration conditions, and before a workout.
Frequently asked questions
Is this as accurate as DEXA?
No. DEXA is generally more precise, but calipers are practical, low-cost, and great for tracking trends.
Can beginners use skinfold calipers?
Yes, but expect a short learning curve. Accuracy improves quickly when you practice site location and technique.
Should I use this during fat loss or muscle gain?
Both. It helps you estimate whether weight changes are likely from fat mass or lean mass over time.
Bottom line
A fat caliper body fat calculator is one of the most practical tools for real-world progress tracking. Use it consistently, focus on trends, and combine your data with strength, energy, sleep, and waist measurements for the clearest picture of body composition change.