If you are interested in having a sculpted jawline, then it's important to know what your body fat percentage is and where you want it to be. 

It’s important that you don’t obsess about your hairline and ignore your jawline. You need to make sure that both are in check. After all, if your hairline is on point and you have a big double chin, then no matter how good your hair looks, it will be highly noticeable because of the size of your double chin.

The ideal body fat percentage for jawline definition may vary from person to person, but most people believe that the lowest amount of body fat you can have is around 10% or less.

The average person has between 20% and 25% body fat. That's a lot of extra weight to carry around! If you want to know what your body fat percentage is, you can use Skin Fold Calipers  to measure skin folds at various locations on the body (triceps, subscapular, suprailiac).

This is the least expensive way to measure body fat but it's also the least accurate because it relies on equations rather than actual measurement.