# i need help with John Flynn's method of diagonal backing

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**1**Member

Thread Starter

Join Date: Apr 2012

Posts: 31

**i need help with John Flynn's method of diagonal backing**

i need help with John Flynn's method of diagonal backing i am not quite understanding how to do the math

could someone who understands how to do the math do it for me?

my quilt top is 48" by 60" and i will be using 43" fabric.

here is a link to it http://www.flynnquilt.com/media/uplo...onalpb1103.pdf

Thanks in advance!

Madeline

could someone who understands how to do the math do it for me?

my quilt top is 48" by 60" and i will be using 43" fabric.

here is a link to it http://www.flynnquilt.com/media/uplo...onalpb1103.pdf

Thanks in advance!

Madeline

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**2**Power Poster

Join Date: Jan 2009

Location: Front row

Posts: 14,648

I like this method better: http://www.reddawn.net/quilt/backings.htm

If you want to use the JF method try cutting paper first to get the math right before cutting the fabric.

If you want to use the JF method try cutting paper first to get the math right before cutting the fabric.

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**3**Super Member

Join Date: May 2008

Location: Southern Ontario Canada

Posts: 1,445

Here is a fabric calculator which i use all the time.Great for backings

http://vrya.net/quilt/index.php

Gale

http://vrya.net/quilt/index.php

Gale

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**4**Super Member

Join Date: Mar 2012

Location: Garland, Texas

Posts: 1,388

That is way too much work; plus I just completed Algebra by the greatest curve in history. Good luck! For me I'd by two times what my quilt length and width is just ot be safe.

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**5**Member

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Join Date: Apr 2012

Posts: 31

i found a calculator for it on a website.

here's the link if anyone else wants it http://www.multi-patch.com/html/diag...calculator.php

Thanks!

Madeline

here's the link if anyone else wants it http://www.multi-patch.com/html/diag...calculator.php

Thanks!

Madeline

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**6**Super Member

Join Date: May 2011

Posts: 4,608

Be sure you add the 4" on the top, bottom and each side when you use the length and width of the back -- otherwise you don't have enough backing if you are going to have it longarmed.

I did it by hand and got the same answer of 101" (actually 100.827...) that the calculator came up with -- Yeah!! I can still do algebra.

I did it by hand and got the same answer of 101" (actually 100.827...) that the calculator came up with -- Yeah!! I can still do algebra.

*Last edited by QuiltnLady1; 06-02-2012 at 04:07 PM.*

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**7**Member

Thread Starter

Join Date: Apr 2012

Posts: 31

QuiltnLady1 : i wasn't planing on having it longarmed i am going to quilt it myself (stitch in the ditch)

how much should i add on the sides ?

Thanks!

Madeline

how much should i add on the sides ?

Thanks!

Madeline

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**8**Power Poster

Join Date: Dec 2009

Location: Outside St. Louis

Posts: 35,518

Two or three inches extra all around is usually enough. Just make sure it is center good.

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**9**Senior Member

Join Date: Feb 2011

Location: iowa

Posts: 663

Great calculator! I use the John Flynn method for Hospice quilts that are 45 - 50 inches wide. This method saves so much fabric. There is very little waste. Thanks for posting this site. Good Luck with your quilt, Madeline. Be careful with the bias edges and you will be happy with the result.

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**10**Banned

Join Date: Mar 2010

Location: Sturbridge, Ma

Posts: 3,993

Your example is almost like John's example. The only difference is in the width of the fabric he uses in the example and yours. His is 44" and yours is 43.

If you will just substitute your figures for his in the the example you will see what the additional measurements are.

I do note that he adds 3" to the width of the quilt and 6" to the length.

However, I did the forumla and get that you need 82" of fabric to do the diagonal method.

The forumulae is 66 + 66x(51-43) or

____________

2 x 43-51 or

86-51 or 35

So 66 x8

_____

35 or 15.8 inches and 66 + 15.8 = 81.08 and I would round it up to 82"

I find that I must go back to his formular illustration and plug in my measurements before I can do it. (everytime) sure better than buying two length of the fabric.

If you will just substitute your figures for his in the the example you will see what the additional measurements are.

I do note that he adds 3" to the width of the quilt and 6" to the length.

However, I did the forumla and get that you need 82" of fabric to do the diagonal method.

The forumulae is 66 + 66x(51-43) or

____________

2 x 43-51 or

86-51 or 35

So 66 x8

_____

35 or 15.8 inches and 66 + 15.8 = 81.08 and I would round it up to 82"

I find that I must go back to his formular illustration and plug in my measurements before I can do it. (everytime) sure better than buying two length of the fabric.

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