Free body fat calculator for the UK below.
Based on Lean Body Mass
An additional method of figuring out how much protein you need takes into account activity level and lean body mass. Some experts feel that this is a more accurate technique since our lean body mass requires more protein for maintenance than fatty tissue.
Lean body mass (LBM) is simply the amount of body weight that is not fat. It includes bone, water, muscle, organs, and other tissues. There are different ways to determine your lean body mass, but the easiest is to subtract your body fat from your total body mass.
First, you’ll need to determine your body fat percent. There are different ways to get the number including body fat testing with skin calipers, BIA scales, or DeXA scans. You can also estimate body fat with this calculator.
Body Fat Calculator
BMI Caculator here