With a typical jelly roll, the strips are 2 1/2" - so they finish at 2"(we are going to talk in terms of finished size). When you sew them all end to end, they are 2" x 1600". When you bring the tail to the head and sew your first seam, your quilt is now 4" x 800". Bring the tail to the head and sew again, now for the second seam, 8" X 400". Are you seeing the pattern? - 16" X 200", 32" x 100", 64" x 50". If you would fold it in half again, it would be 128" X25". I would say the most you would want to bring the head to the tail is 5 times (32 strips wide)- or to the 64" mark, because 128" is just too big!!

*The question was asked about how many inches for queen size? How many strips?*Let's aim for somewhere around 88" X 96" (mattress size listed as 60 X 80)

**.**

*We are going to do this quilt as two Jelly Roll Race Quilts*

*Quilt 1*Let's start with Quilt 1. We want this piece to measure 64" long X 88" wide. Each Strip finished at 2", so that is

**32**strips long. So we need 88" Wide by 32 strips long (64")= 2816". Converting that to strips would be

**70.4**strips. Remember - you are going 88" across with your strips. If you are using full strips (around 40"), you are going to have basically 2 strips across in every row. Don't forget to start with a half strip...or you could use half strip widths.

*Quilt 2*We are now going to make quilt 2. Since the first quilt was 64" long, we are going to make this one 32" long. 64+32=96". So this quilt will measure 32" long X 88" wide. Each strip finished at 2", so that is

**16**strips long. 16 strips X 88 across = 1408". Converting that to strips would be

**35.2**strips.

**Remember- you are bringing the head to the tail one less time on this quilt.**

Sew Quilt one to Quilt 2 and square up. Your quilt should measure approximately 88" x 96".

*Back to the Math- and more ramblings by me......***My advice always Start with the length (32" or 64")**. Remember...when you bring the head to the tail, one measurement doubles and the other measurement decreases by HALF.*If you want to make a baby jelly roll race quilt and you want to know how many strips (or inches) to use -If your length is 32", select a proportional width (around 28"). Using the formula 32" = 16 strips of 2" each; 28" wide X 16 strips = 448" (11 strips)*- Lastly- don't be afraid to turn the quilt vertical! 64" can be your width. Figure it the same way. to make 64" wide X 80 long....32 strips X 80" Long= 2560" (or 64 strips)
- You can make other lengths besides 32" and 64", but you will have to use your seam ripper.

Did I confuse you further or is it making sense?

**My Formula:**

**Determine the length (32" or 64")****Determine a proportional width to go with the length selected****Take the # of strips (16=32" OR 32=64")multiplied by the Width desired (NUMBER YOU CHOSE IN #2) to get how many inches you need.****If you want to estimate strips, divide this number by 40.**

## 6 comments:

Thanks so much for making this easy to understand. I have been trying to do this myself and lose patience!!

Thanks for all of this info. I've been figuring out how many strips I need to make a King...now I know to just sew two separate quilts together to make the size I need...duh!! LOL

Thanks again!

thank you for this great post and the explanations. i want to try my first jelly roll quilt soon, cutting my own fabric -- i was in desperate need for an explanation like yours! let's see how it turns out!

I, too, thank you very much for all this calculating material. Math and I REALLY don't mix so you have answered a lot of my questions and provided direction.

I am going to give your link to the other quilters in my quilt group, many of whom are beginners. I know they too will appreciate you time and talent.

Thanks again. Jean

This is so great! Exactly what I was looking for. Thank you for posting this and in a way I understand. I'm so excited now!

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