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Body Fat Percentage Sloan Caliper Calculator
Estimate body density and fat percentage in active younger populations using the 2-site Sloan caliper equation.
About the Sloan 2-Site Caliper Method
The Sloan method provides a rapid two-site skinfold assessment derived from active, college-aged populations.
Linear Density Equations
- Men: Body Density = 1.1043 - (0.001327 × Thigh) - (0.001310 × Subscapular)
- Women: Body Density = 1.0764 - (0.000810 × Suprailiac) - (0.000880 × Triceps)
Frequently Asked Questions
What makes the Sloan method practical?
It requires only two measurement sites, making it faster to administer than 4- or 7-site protocols.
Which population does this formula target?
It was validated on active young adults ages 18 to 30; older demographics may experience minor systematic underestimation.
How does the thigh measurement work for men?
Measure a vertical fold on the anterior midline of the thigh midway between the hip crease and the top of the patella.
Does caliper friction alter readings?
Yes. Calipers should be serviced and calibrated periodically to maintain accurate spring tension.
How to use
Calculate in three steps
- 1Enter your valuesUse the fields above and check the units shown beside each input.
- 2Run the calculationSelect Calculate to refresh the result with your latest values.
- 3Review or shareCompare the result, reset the form, print it, or share this page.
Inputs
What you need
Biological SexValue
Site 1: Thigh (Men) / Suprailiac (Women)mm
Site 2: Subscapular (Men) / Triceps (Women)mm
Body Weight (kg)kg