Jelly Roll Quilt Math Simplified! - What you need to know!

hey there i'm kristen with icstarsquilting.com let's talk a little bit more about jelly rolls we've been talking about jelly rolls for about five weeks six weeks i don't remember we've been talking about jelly rolls for a little bit if you're just coming into this video go back look at the description down below see if you can find the other jelly roll videos i will link everything down below that i'm talking about in this video okay i also want you to know that if you have not rsvp'd for the jelly roll party that i'm gonna have what are you waiting for it's gonna be so much fun i have prizes to give away and all kinds of good stuff that is also linked in the details down below i get emails that ask you know hey what if i want to make a jelly roll quilt this size what if i have three jelly rolls how big a quilt will that make now my answer to that question is not always a popular answer okay it doesn't ever make anybody excited or get like really really happy because my answer is you gotta do the math okay you have to do the math and i'm with you i'm a creative soul math is not my strong point okay i can do math when it comes to quilts all right because i know if i do the math now then i'm not going to have to worry about coming up with some weird funky size quilt afterwards okay it's all going to be taken care of and it's going to be okay in order to take this roll of fabric hold on i don't have a roll of fabric with me okay in order to take this roll of fabric and turn it into a gorgeous quilt you're gonna have to do a little bit of math i can't look at this and tell you what size jelly roll it's going to make actually that's a lie i can because i know because i've done the math before but by the end of this video you're going to have specific instructions specific formulas it's not super complicated but you do have to do just a little bit of math okay so you're going to be able to know exactly what size quilt you're going to make with what size jelly roll you have or if you're making your own jelly rolls i have a formula for that as well because like i mean like this project right here behind me it's a a big it's a big one okay it's a big jelly roll quilt but i didn't make these strips i actually cut these strips from yardage okay so these strips are not two and a half inches wide they're actually i think they're three and a half inches wide yeah they're three and a half inches wide so those strips are bigger than these strips are and i was able to calculate how big i needed to make it that right there is it's ginormous that that is only folded in half okay so um it's going to be a big quilt but it's going to be beautiful right so let's look at the formulas for how you can do each size we're going to go over a baby size quilt we're going to go over a throw size quilt we're going to go over a queen size quilt and for all of you adventurous quilters out there a king size quilt okay that one is a big quilt we're also going to go over you know if you want to take on a project like i did right here which is i want to cut my own strips out of yardage and truthfully on a big big quilt like that you lose a lot of fabric in the yardage because every time you sew a seam you lose half an inch right if you do a quarter inch seam you're going to lose a half an inch on the top and a half an inch on the bottom so all those strips are going to end up at two inch strips instead of two and a half inch strips right so it goes to say that if you make it at three and a half inch strip those strips are gonna come out to three inches right so you're still losing a little bit of fabric but you you still have these big chunkier things that are going to make up a much just just trust me on that okay it makes sense when you see it on paper let's go over each quilt okay it's easier for me to write it out and explain it to you rather than just throw a whole bunch of numbers and facts and all kinds of weird things up on the screen so let's try it this way okay the first size that we're gonna go over is the baby size quilt if you're wanting to make a baby size quilt it's going to be roughly but close to and a half inches by 50 inches okay that's going to be like your finishing size it may be a tiny bit smaller than that it may be a tiny bit bigger than that depending on if you've got your seams exactly at a quarter of an inch or you fudge it sometimes or you use multiple different fabrics you know you want to get in somewhere in that range to get a baby size jelly roll quilt in the standard form in the example like i did in this link right up here you're going to need 20 40 inch strips okay that's gonna get you to this size right here now something that i like to do is i like to cut my strips in half and make them smaller pieces rather than the huge long 40 inch strips what that does is it gives the quilt more of a mixed look cutting those strips in half you'll need 40 20 inch strips that's going to give you the same thing even though you're going to lose just a little bit in the seams when you sew those 20 inch strips together you're going to lose a little bit in the seams when you sew those 40 inch strips together as well okay so this is what you're going to need for the baby size quilt that's going to end up at this size right here the shorter the strips are the more busy that your quilt is going to look the more fabric variation and colors the more that the fabric is going to overlap with other colors and it's going to allow for more of a pattern so this is what you need for your baby size quilt let's move up to a lap size quilt for a lap size quilt you're going to want something that is going to be about 50 inches by 64.5 inches for this you're going to need 40 40 inch strips and this is what i did in the example video when i sewed a jelly roll race quilt earlier this is a typical jelly roll race quilt is that 40 40 inch strips if you cut them in half and you use the the 20 inch strips you're going to need 80 of them all you're doing is you're taking these strips right here chopping them in half you can add in and you know cut them into smaller bits if you cut them really really really small i might suggest adding an extra strip or two in there just to make sure but if you're making a lap sized quilt the quilt size is relative okay this is kind of what we're shooting for in here but it does not have to be that exact number now if you are making a twin size quilt you're going to shoot for 64 inches by 88 inches okay that will fit on a twin sized bed in order to do that i'm going to tell you what you need here but there is a couple little differences in the final product okay but let's get with what we need first you'll need 70 40 inch strips or 140 20 inch strips now i know that sounds like a lot okay and it is a lot you're making a twin sized quilt and you're using the two and a half inch strips okay that's what this formula is right here you're using the two and a half inch standard jelly roll strips i'll show you in just a few minutes if you want to cut your own strips how to figure out how much you'll need okay let me show you what you're going to do because technically when you make the twin size quilt you're going to end up making two of them okay so if you have two sets when you are finished with each set let me write that down again so you're going to have two sets with half of the strips okay that's either 35 or 70. okay this is the 40 inch and this is the 20 inch okay so what you're going to do is you are going to make a jelly roll quilt that is like that and a jelly roll quilt that is like that sorry they're going to be the same size i know i drew them off but they're going to be the same size okay so you're going to have your beautiful jelly roll quilt all the strips are sewn together and now you have two of them and it's your typical jelly roll quilt with all these lovely lines through it you may have some smaller pieces you may have some bigger pieces so once you have two of them they're each going to be about 87 and a half by 32 and a half okay so that's what each of these sizes are then you're going to sew these two together that is going to give you your final size of 64 by 88 and like i said roughly okay if that tiny tiny fraction of an inch let's see i've got 87.5 here and it's really 88 here if that really bothers you you can add just a little bit more or you can add a border or something to it that makes it all together generally you're not going to be able to see the difference in these two pieces right here okay because all of these fabrics are just going to blend right into each other and if you make sure and you nest your seams boop link right up there on nesting your seams nobody's ever going to know that these are like two different pieces okay you're just going to see this explosion of color and beautiful beautiful fabrics all coming together to make a beautiful large size twin bed okay so this method moving forward you're gonna need to know this okay because the bigger you go the more pieces you're gonna have to do to make this okay so let's move on to the queen size okay keep this in mind you're gonna need to come back to this let's move on to the queen size bed okay so a queen size quilt is like this okay you are going to need 105 40 inch strips or 210 20 inch strips okay you're going to do the exact same thing here except you're going to divide this number by three okay so you are actually going to make three of this that we were talking about right here ignore that line right there okay you are going to make three of these and then you're going to sew them side by side that is going to give you your queen size quilt okay so they're going to be 87.5 inches by 32.5 inches roughly this is like the actual math part of it if you come in just a little bit short or a little bit different that's okay okay you're gonna sew them together side by side your standard queen size quilt is 86 by 93 okay what this method comes out to is going to be 87 and a half by 96 and a half okay so this is what your let's let's do this let's do your um jelly roll using these numbers up here this is what your jelly roll is going to come out to okay so this one you're going to do three of them whereas the twin you are doing two of them so once you get to this you can either trim it down to be the standard size quilt or you can just leave it as is and have just a little bit of extra on there it does not bother me to have just a little bit of extra on there and yes i have made a queen size jelly roll quilt it turned out really really amazing i'll see if i can pull up some pictures of that so i can show you okay last one and then we'll get to the create your own size quilt okay let's go with the king size quilt for the king size quilt you're going to need 120 40 inch strips or come on you've been following along here how many 20-inch strips i totally have my teacher voice on right here i'm sorry tell me 240 20 inch strips your standard king let's do this your standard king is going to be 104 by 93. now we can't quite get this number what we can get with our jelly roll let's do our jelly king is about 100 by 96 and a half so i mean a little like in the same range okay now if this really really bothers you you can always add on a border or you can add like a sashing in the middle or you know something to make this fit into the standard roll that you want it to that's only if it bothers you if it doesn't bother you don't worry about it make this 100 by 96 and a half and you are gold it's gonna be beautiful okay so with the king sized one you're gonna do the same thing okay it's gonna be three segments okay so three segments that's a really weird three let's fix that you're gonna do three segments okay your three segments are going to be 40 strips each okay um and that's for the the 40 inch ones you know if you do the 20 inch strips it's going to be 80 strips okay so this is the 40 inch i'm gonna do 80 strips if you're doing the 20 inch strips okay because yeah 20 times 2 is 40. so you need twice as many of the 20 inch strips and then you're going to stop sewing and cutting and dividing when you get to your 100 inches by 32 and a half inches okay so this is what each of your segments is going to be okay so you're gonna do this three times you're going to get to this 100 inches by 32 and a half inches and it's going to be same as this all right so you're going to do wait till this is 100 inches and then this is 32 and a half inches and then you're going to stop you're going to move on to your next pile of strips and you're going to do it again all again and then you're going to stop and then you're going to do it one more time and you're going to join those three sections together and tada you are going to have a ginormous king-sized jelly roll quilt okay so we've been through each of these and remember check the link below if you want to see all of this written out in like blog post form so that you can take those notes and go forward with it so you're not having to copy my writing while we're doing this video and i know what you're thinking but kristen what if i want to make my own jelly roll quilt and i want a formula that can get me through everything in life okay let's talk about that if you want to make a custom size jelly roll quilt okay this right here this is your magic formula okay so i'm gonna go ahead and write that here because this is what you need to know if you're about to go rogue and step out on your own and make an amazing jelly roll quilt that is custom sized this is what you're going to need to know okay you can't go rogue all on your own and not have some type of plan this right here is your plan okay now i'm going to give you the formula and then we're going to walk through it with an example so that you can understand it because otherwise it's just going to be mush and if you have to back up and watch this part again it's okay because the very first time i heard this and understood it from somebody else they had to explain it multiple times for me because again math is not my strong point but quilt math is necessary so here is the formula okay so you have your width of your quilt times the number of rows divided by 40 is how many strips you're going to need this is going to help you calculate your formula okay this is the formula that is going to help you calculate how much fabric you need okay so let's talk about a couple things first 40 right here this number is your width of fabric i know most fabric comes in and it's like uh 42 inches or 43 inches you're gonna lose a little bit on the selvage and then you're going to lose a little bit on the seams so let's say roughly 40 inches let's start with 40 inches okay now your number of rows and the width of your quilt you aren't going to go into this just assuming that you're going to make a quilt of any size let's say you have in your mind that you want roughly a quilt that is 80 inches by 96 inches okay this is what you're shooting for that's the size you said you wanted to make somewhere in that frame okay it may be like just a half inch off or something but that's about the size that you want to make okay so your width of your quilt is 80 inches okay and we're going to figure out next how many rows that makes okay because your quilt remember your quilt looks like this all right so you have all of these rows okay and you want to get up to um 96 inches so all of this is going to be 96 inches okay now this is where you get to decide if you want to use your standard jelly roll okay and remember this is two and a half inches but we're not going to get two and a half inches out of this we're going to take a quarter inch off here and a quarter inch here and that's going to be two inches now you could do your standard jelly roll or you could actually cut from yards of fabric and do much bigger pieces of fabric let's say you decide that your pieces are each going to be four inches tall okay now we know that four inches actually means four and a half inches cut okay because what you're going to see is the four inches that half inch is going to be lost in your seams from here and here right so this is where we do a little bit of math okay so we want 96 inches to be about what this is finishing out at so we're going 96 inches divided by 4 inches is going to give us 24 rows okay so we're gonna have 24 rows right here and we know that our 40 inches are going to be cut at that four and a half inches okay i know i've got a lot of numbers rolling around right here but just follow with me so we took the 96 inches and we divided it by four inches that is going to give us 4 plus 4 plus 4 you know times 24 is going to give us 96 inches so our width the quilt is 80. our number of rows 24 times 4 inches is going to give us 96 so that is our width and our length okay so let's get that number before we move on so we've got 80 times 24 that's gonna give us a pretty big number okay so that's going to give us 1920 okay now we're going to divide that by 40 which is our width of fabric up here right so we've got 1920 divided by 40 is 48 this right here that 48 that is how many strips i need to cut at four and a half inches wide right that's how many strips i need to cut at four and a half inches wide to get this quilt right here that's how much fabric is going to be needed for this quilt okay now being that this is an 80 inch quilt it's probably going to need to be somewhere in the neighborhood of possibly three pieces okay but that's something that you can look at later figuring out you know what size is this width close to is it close to like a a standard size quilt or is it closer to a king or is it closer to a twin um you know it's a little bit bigger than a twin so you might be able to get away with two pieces but technically i think you're gonna need to do three pieces on this particular example now i just kind of made this part up okay so you need to cut 48 strips now if you did say your strips at not four inches if you did it at two inches you're going to need double this number of strips okay so that's why when i do my own custom jelly roll quilts and i like to make the strips a little bit thicker than your standard jelly roll if i'm making just a throw quilt like i did in the example yeah your pre-cuts are absolutely wonderful they're already done for you most time they're already coordinated but if you want to do something with your own fabric piece together your own collection of fabrics and colors and patterns and all of that this is the formula that you will use so it is the width of your quilt times the number of rows divided by 40 is how many strips that you will need now if you want to go and figure out how much yardage that is that's like a whole different level of math okay um because that really depends on like how many fabrics you're using and if you're using scraps or you're using you know other pre-cuts and stuff if you are using pieces that are smaller than 20 inches or if you're using like small squares to go in between them then you may just for the sake of having enough and not too little it's okay to have a little bit too much it's not okay to be short you may add one or two extra strips in here just to make sure that you are gold on this okay i often do that just for what i call sanity's sake okay just add in an extra strip or two to make sure that you have enough fabric because having enough is okay coming up short is not okay i hope that that was clear if you have questions please feel free to leave them down in the comments down below i'll be happy to address them watch it again if you need to but this is the magic formula okay this is what you need to do if you're going to make a custom size jolly roll quilt okay not that hard right i mean it's it's a little bit to figure out it's a little bit to look at it and like step back and like actually do the math but part of you has to go you know what i'm being very responsible quilter i'm making sure that i'm not going to get frustrated in the end by using too little fabric i'm not going to like way overshoot this and use way too much fabric you're doing a good thing okay this few minutes of math in the beginning is going to save you so much time and guesswork in the end if you are new to quilting or if you are looking to improve your skills maybe you don't really have a ton of confidence in your skills and you're like um you know i kinda sorta maybe maybe i don't know what i'm doing but i like doing this i would like to know what i'm doing i have a secret to tell you but i have a class it's open twice a year and i have not opened it up this year and i get several emails a week from students that are friends of prior students and they want to take this class and i have not opened it up yet um y'all it's coming up soon okay i am going to open up my modern quilting made easy class i will put a link down to this below so that you can get on the wait list for that class because it does fill up fast and i have to tell you that um the reason i haven't opened it up this year yet is because i have added some really really really great content to it you know the class is amazing as is okay it is a complete eight week course on learning how to quilt the right way the confident way you make an amazing quilt by the end of it okay from very very beginning to the very very end i am with you every step of the way on this class keep an eye on your inbox for when that class opens up i have one more video on jelly roll quilting that i'm going to show you next week maybe one more video after that i haven't quite decided if i want to show you the last project or not and um you know let me know in the comments what you think about these video series if you like all that i'm doing with the jelly rolls you know maybe we can take on some other pre-cuts later on in the year and i can show you what i do with those because i love these things i love these things and i love working with them it makes it easy and you are by no means put into some box when you use pre-cuts it's just the starting point so let me know in the comments what you think about those i look forward to seeing you again next week i hope that you have a wonderful day and i'll talk to you soon i'm kristen with icstarsquilting.com bye [Music] you

Channel: ISeeStarsQuilting

Views: 5,703

Rating: 4.9668508 out of 5

Keywords: modern quilting, quilting, beginner quilting, jelly roll, Jelly Roll Quilt, Quilt Math, Jelly Roll Race, quilt sizes chart, Quilt sizes, jelly roll quilt ideas, jelly roll quilt patterns, jelly roll quilt patterns free, jelly roll quilt tutorials, modern quilting videos, modern quilting for beginners, modern quilting blogs, Quilting calculations, how much fabric do I need, fabric calculations, jelly roll race, jelly roll quilts

Id: EwBAtcXefLs

Length: 27min 52sec (1672 seconds)

Published: Wed May 05 2021