Want to know your body fat percentage? This free body fat calculator estimates it instantly.

How to use this body fat calculator

Whether you’re checking your own body fat percentage or doing the calculations for a client, here’s the information you’ll need:

• age
• sex
• height
• weight
• waist circumference
• hip circumference
• neck circumference

You’ll know the first few details off the top of your head. But what about your neck, waist, and hip circumference? Just grab a measuring tape and use the instructions below.

What this body fat calculator can do (and what it can’t do)

This body fat calculator estimates the percentage of your body weight that is fat mass. Fat mass is exactly what you think it is: All the fat on your body. The body fat calculator also estimates your lean mass. Simply put, lean mass is anything that isn’t fat mass—muscle, bone, organs, connective tissue, water, and even stuff inside your GI tract. Please note that your level of body fat doesn’t define your health status. For instance, it’s possible to be very healthy at a higher body fat percentage. Or very unhealthy at a lower body fat percentage.