## Thread Count Conversion

Disscussing old, rare, very specific or otherwise uncommon units and measurements
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### Thread Count Conversion

I have purchased a set of bed sheets and the thread count states 500 threads per 10cm squared.

What is the square inch conversion?

Thanking you in advance...
Puzzled

### thread count conversion

1inch = 2.5cm, so 1 square inch = 4.25 cm square.

If 10 cm square = 500 threads,
it translates to somewhere under 250 threads / square inch. Hope that's helpful.

(4.25cm2 / 10cm2 x 500 threads = 212 threads)

Bummer huh. I just had the same experience when I realized the 600thread count I bought was by 10cm2 not inch.
h

500 tc per10cmsq = 400 tc per sq inch

500/1.25
Guest

### The CORRECT answer is:

I have purchased a set of bed sheets and the thread count states 500 threads per 10cm squared.

What is the square inch conversion?

Thanking you in advance...

I love it! Some people think: Let's make it really complicated. Why? WHY do people do that? It IS basic math you should know from the 3rd grade in grade school on how to figure this stuff out.

10 cmÂ˛ = 1.55 inÂ˛ on the conversion page. Just click on the http://www.convert-me.com/en/convert/area at the top of the page, and at the cmÂ˛ enter 1 and look below and it will tell you that IS: 1.55 inchesÂ˛

SO, 500 threads per 10 cmÂ˛ DIVIDED BY 1.55 = 500 Ă· 1.55 which EQUALS 322.58 threads per inchÂ˛.

Or, if you want to use the 6.45 cmÂ˛ number, then divide 500 by 10 and times that by the 6.45 and you get the same 1 inchÂ˛ = 322.5 Threads per square inch.

Yeah, 600 threads per 10 cmÂ˛ would only be 387 threads per square inch. 600 Ă· 10 * 6.45 = 387

I have a set of 600 threads per square inch sheets. WOW, are they NICE!! The really feel wonderful.

What is that in cmÂ˛ ? 930 threads per cmÂ˛ !! Ken Chevy
competent

Posts: 57
Joined: Mon Sep 26, 2005 11:22 am
Location: Salem, OR, USA

### The CORRECT answer!!!

Oh dear, what a condescending and thoroughly misleading post above.

thread count (being the total number of threads per area) is roughly thread count/2 each way

length of one side of a 10cm^2 area = sqrt(10) = 3.16cm

threads per side for 500 thread count = 500/2 = 250

threads per cm length = 250/3.16 = 79 threads per cm

1 inch = 2.54cm so for 1 inch length there are 79x2.54 = 200 threads

200 threads per inch each way = 200x2 = 400 threads per square inch

which is the right answer!
scottle

### Re: Thread Count Conversion

Thread count is measured by counting the number of threads contained in one square inch of fabric or one square centimetre, including both the length (warp) and width (weft) threads.
It is important to see that thread count is the number of threads counted along two sides (up and across), added together. So TPI (threads per inch) quoted by linen manufacturers can also be thought of as threads per square inch (or threads per both sides of a square inch).

As 3.16cm x 3.16cm = 10cm^2
1inch x 1inch = 1inch^2
and 1 inch = 2.54cm
so 2.54cmx2.54cm = 1 inch^2
when measuring TPI you are counting the threads along 2.54cm+2.54cm = 2x2.54cm
when measuring threads per 10cm^2 you are counting the threads along 3.16cm+3.16cm = 2x3.16cm

To convert from TPI to threads per 10 cm^2 the calculation for the conversion factor is...
(2x3.16)/(2x2.54) = 3.16/2.54 = 1.244 rounded up to 1.25 for simplicity.

However it is not that simple... For marketing purposes some manufacturers of linen are deliberately misleading and count the individual threads in 'plied' yarns (a yarn that is made by twisting together multiple finer threads) so a fabric with 250 two-ply yarns in both the vertical and horizontal direction could have the component threads counted to a 1000 thread count.

Here is a chart to help explain:

Counting 1 plied yarn as one thread____Counting 2 plied yarn as one thread____Counting 3 plied yarn as one thread
___(TPI)___(threads per 10 cm^2)_______(TPI)___(threads per 10 cm^2)_______(TPI)___(threads per 10 cm^2)___
___100_________125__________________200_________250__________________300_________375_____________
___150_________190__________________300_________380__________________450_________570_____________
___160_________200__________________320_________400__________________480_________600_____________
___200_________250__________________400_________500__________________600_________750_____________
___240_________300__________________480_________600__________________720_________900_____________
___300_________375__________________600_________750__________________900________1125_____________

### Re: Thread Count Conversion

Thread count is measured by counting the number of threads contained in one square inch of fabric or one square centimeter, including both the length (warp) and width (weft) threads.
It is important to see that thread count is the number of threads counted along two sides (up and across), added together. So TPI (threads per inch) quoted by linen manufacturers can also be thought of as threads per square inch (or threads per both sides of a square inch).

As 3.16cm x 3.16cm = 10cm^2
1inch x 1inch = 1inch^2
and 1 inch = 2.54cm
so 2.54cmx2.54cm = 1 inch^2
when measuring TPI you are counting the threads along 2.54cm+2.54cm = 2x2.54cm
when measuring threads per 10cm^2 you are counting the threads along 3.16cm+3.16cm = 2x3.16cm

To convert from TPI to threads per 10 cm^2 the calculation for the conversion factor is...
(2x3.16)/(2x2.54) = 3.16/2.54 = 1.244 rounded up to 1.25 for simplicity.

However it is not that simple... For marketing purposes some manufacturers of linen are deliberately misleading and count the individual threads in 'plied' yarns (a yarn that is made by twisting together multiple finer threads) so a fabric with 250 two-ply yarns in both the vertical and horizontal direction could have the component threads counted to a 1000 thread count.

Here is a chart to help explain:

Counting plied yarn as one thread______Counting 2 plied yarn as 2 threads______Counting 3 plied yarn as 3 threads
___(TPI)___(threads per 10 cm^2)_______(TPI)___(threads per 10 cm^2)_______(TPI)___(threads per 10 cm^2)___
___100_________125__________________200_________250__________________300_________375_____________
___150_________190__________________300_________380__________________450_________570_____________
___160_________200__________________320_________400__________________480_________600_____________
___200_________250__________________400_________500__________________600_________750_____________
___240_________300__________________480_________600__________________720_________900_____________
___300_________375__________________600_________750__________________900________1125_____________

chandulvsu