LAB·01US Navy · RFM · BMI
Body fat calculator
Measure with a soft tape for the most accurate result, or with two photos. No tape? You still get an estimate from height and weight.
- Free
- Private
- No sign-up needed
Your stats
Sex
Tape measurements
Neck: Just below the Adam's apple, the tape sloping slightly down at the front.
Measure on bare skin, relaxed, with the tape snug but not pressing.
Enter your height first: it sets the scale.
Your body fat
—%
Enter your height and weight to start, then add tape measurements for precision.
How it works
Measure
Neck, waist and, for women, hips. Thirty seconds with a soft tape.
Triangulate
Three independent formulas give a range, so you see how certain the number is.
Track
Save it to your profile and follow the trend, not a single reading.
Sources
- US Navy circumference method · Hodgdon & Beckett, Naval Health Research Center, 1984
- Relative Fat Mass · Woolcott & Bergman, Scientific Reports, 2018
RepFit Lab gives estimates to guide your training, not medical advice. If you have a medical condition, are pregnant or have a history of disordered eating, talk to a doctor before changing how you eat or train.