Thread: BodyFat Formula?

I would first try posting this in the right forum.

30% fat is 155.4 lbs LBM to find total weight at 10% multiple that by 110% or 1.1 and get 170.94.

No algebra required.

Originally Posted by nsimmons

30% fat is 155.4 lbs LBM to find total weight at 10% multiple that by 110% or 1.1 and get 170.94.

No algebra required.

How did you find that 30% bf is 155.4lbs?

When I did it I did the following:

Weight - 222lbs
BodyFat - 30%


Divide total weight by 100 = 1% body weight
220/100=2.22
2.22=1% bf

FAT - 2.22x30=66.60 (67lbs)
LBM - 222lbs-67lbs=155lbs
10%BF - 2.22lbsx10=22.2lbs (155+22.2=*177lbs*)

I need to be 177lbs in order to be 10% BodyFat

222 * 0.3= 66.6
222-66.6=155.4

just realized you might have misunderstood my post...155.4 LBM lean body mass, the 66.6 is the 30% fat

Originally Posted by nsimmons

222 * 0.3= 66.6
222-66.6=155.4

just realized you might have misunderstood my post...155.4 LBM lean body mass, the 66.6 is the 30% fat

Nope I understood you. I just think 170 is wrong? so your calculation say at 170lbs a person who was 30%bf would be 10% bf? How did I get 7lbs more than you brotha?

your math is wrong, 2.22lbs % body fat is only valid at 30% fat, when you get down to 10% fat the lb per % is going to be lower. Besides that your way of dividing 222 by 100 gives mass per %, (a mix of muscle, fat, bone, water, etc) not just body fat.

try this

Final Weight = (Current weight - (Current weight*current bf%)) * 1.desiredbf

example
(222 - (222 * 0.30)) * 1.10 = 170.94lbs to be 10% bf with no muscle gain


shitty algorithm but it works on my calculator

Originally Posted by nsimmons

your math is wrong, 2.22lbs % body fat is only valid at 30% fat, when you get down to 10% fat the lb per % is going to be lower. Besides that your way of dividing 222 by 100 gives mass per %, (a mix of muscle, fat, bone, water, etc) not just body fat.

try this

Final Weight = (Current weight - (Current weight*current bf%)) * 1.desiredbf

example
(222 - (222 * 0.30)) * 1.10 = 170.94lbs to be 10% bf with no muscle gain


shitty algorithm but it works on my calculator

Hmm intersting. Thanks

This is what i calculated
222lbs At 30%
LBM=155.4lbs=70% of 222lbs
Bodyfat=66.6lbs=30% of 222lbs


To be at 10% body fat with the same LBM of 155.4lbs

LBM= 155.4lbs=90% bodyweight
Bodyfat=17.2lbs=10% bodyweight

Therefore bodyweight =172.66666.lbs

30% means you have 66.6 lbs of fat mass, and 156.4 lbs lean mass, So 1% of body fat is 2.22lbs about 1KG, 1% of total fat is .666lb