Fat Track Gold
 04222007, 11:10 AM
 Join Date
 Jan 2004
 Location
 Northeastern United States
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Fat Track Gold
I have had these digital calipers for a while now. I still can't get a consistant measurement using these. Thats why I prefer the mirror. Anyway, there is a booklet that came with it that is called "Improve Your Measuring Skill". It has a section called "Determine your ideal weight with the desired bodfat percentage"
The example is this,
Assume you have the following data:
Body fat percentage: 24.5
Body Weight: 165 pounds
Desired body fat percentage: 20
Your ideal weight can be determined as follows:
(100current bodyfat%)/(100 Desired bodyfat %)XCurrent Weight
=(10024.5)/(10020)x165
=155.7 pounds
I can not figure out how they came out with 155.7!!!!
I want to figure out mine. I have no need to be super lean and for me 10% bodyfat would be spectacular. Even 14% would be great!. So if I was to get to 10% what would be my ideal bodyweight?
I am at 18% bodyfat, guessing by my several trys with this product!. I have had it for about 5 years!. I don't really trust it, but I want to figure out this math problem. So my current weight is 232 at 18% bodyfat, 5'10", not that my height matters, I just thought I would throw that in...Can anyone help me figure this out?  04222007, 12:49 PM
 Join Date
 Jan 2004
 Location
 Northeastern United States
 Posts
 15,495
 Rep Power
 4267887
Anyone else as confused as me by this math formula?. Maybe some of the science nerds can help. I know there are few on here and they have to be good at figuring stuff like this out!
 04262007, 01:15 AM
TBone,
For what it's worth, I've heard that the spring used in those calipers is what causes consistency problems. I use a plastic AccuMeasure and have no problems getting consistent readings with that. As for the math problem:
I worked through it and came up with the same answer. Here's how:
They give the formula of:
(100current bodyfat%)/(100Desired bodyfat%)X Current weight.
With the values given of:
Current bodyfat% = 24.5
Desired bodyfat% = 20
Current weight = 165
You have to work in the parenthesis first.
so, the first parenthesis is:
(100current bodyfat%) which is:
(10024.5) this gives us: 75.5
The next parenthesis is:
(100Desired bodyfat%) which is:
(10020) this gives us: 80
OK, so now that you have those values, you can plug them in:
(100current bodyfat%)/(100Desired bodyfat%)X Current weight. Which works out to be:
75.5 divided by 80, multiplied by 165
75.5 divided by 80 = 0.94375
multiply 0.94375 by 165, and you get:
155.71875 or simply: 155.7
There you go, hope I broke it down for you easy to understand like.
Ok, let's try yours:
Current bodyfat% = 18
Desired bodyfat% = 10
Current weight = 232
(10018) divided by (10010) multiplied by 232
82 divided by 90 multiplied by 232
0.91111 multiplied by 232 = 211.37
or simply: 211.4
SOOOOOO, is that forumula useful/correct? I dunno, I'd have to look at my references, but I just wanted to chime in and help you with the math problem, because I HATE when I can't figure out how someone did something!
Hope that helps you out man, I'm tired from all the typing! lol
Lifting 
 04272007, 11:51 AM
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