1. 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:

(100-current bodyfat%)/(100- Desired bodyfat %)XCurrent Weight
=(100-24.5)/(100-20)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?

2. 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!
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3. T-Bone,

For what it's worth, I've heard that the spring used in those calipers is what causes consistency problems. I use a plastic Accu-Measure and have no problems getting consistent readings with that. As for the math problem:
Originally Posted by T-Bone
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:

(100-current bodyfat%)/(100- Desired bodyfat %)XCurrent Weight
=(100-24.5)/(100-20)x165
=155.7 pounds

I can not figure out how they came out with 155.7!!!!
I worked through it and came up with the same answer. Here's how:

They give the formula of:
(100-current bodyfat%)/(100-Desired 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:
(100-current bodyfat%) which is:
(100-24.5) this gives us: 75.5

The next parenthesis is:
(100-Desired bodyfat%) which is:
(100-20) this gives us: 80

OK, so now that you have those values, you can plug them in:

(100-current bodyfat%)/(100-Desired 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.

Originally Posted by T-Bone
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?
Ok, let's try yours:

Current bodyfat% = 18
Desired bodyfat% = 10
Current weight = 232

(100-18) divided by (100-10) 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

4. Originally Posted by LiftingFit
T-Bone,

For what it's worth, I've heard that the spring used in those calipers is what causes consistency problems. I use a plastic Accu-Measure 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:
(100-current bodyfat%)/(100-Desired 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:
(100-current bodyfat%) which is:
(100-24.5) this gives us: 75.5

The next parenthesis is:
(100-Desired bodyfat%) which is:
(100-20) this gives us: 80

OK, so now that you have those values, you can plug them in:

(100-current bodyfat%)/(100-Desired 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

(100-18) divided by (100-10) 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

Thanks a lot!!. I really get stuck on math problems. Me and math just don't mix. Maybe its just the way people explain things, I have a hard time understanding unless things are explained in a way I understand. Thanks though, I understand it now a lot better.