Visual Guide to Calculating Wool Batting for Upholstery

I’m a visual learner so I always find it
easier to draw a map or a diagram to help me figure out the math for
calculating yardage in my upholstery projects. In this video I demonstrate my
visual mapping technique to determine how much wool batting I need to wrap
latex cushions for a mid-century style Minerva sofa. You can use this method to
figure out yardage for your DIY upholstery project, including upholstery fabric,
batting or any material that comes off the roll. For these calculations I’m
using the 84 inch wide Premium Wool Batting that we have in our shop, which
has this thin spun backing which is also wool. If you’re using a different wool
batting you may need to change that 84 inch width to the width of your batting.
I also recommend that you download the free worksheet ‘How to Measure Your
Cushion for Wool Batting’ which gives you more details. You can find that in the
links below this video. For this example I’ll be doing calculations for the
Minerva sofa, which is a mid-century style sofa with a seat cushion a
wedge-shaped back cushion and two pillows. To create a cutting map for your
batting start with a scaled down picture of your wool batting as you would see it
from above, when laid out on the floor or a table. This particular map is not
actually to scale, I just use the graph paper underneath to help me draw
straight lines. I start by writing out the cushion measurements on the side. The
seat cushion is 74 and a half by 28 and a half by 4 and a half
inches thick. The back cushion is 74 and a half inches wide as well, but
since this is a wedge shaped cushion I’m going to do this one a little bit
differently than the standard rectangular seat cushion. I like to draw
a side view with the measurements. It’s easiest if you can measure each side
directly. If you can’t, then there’s some geometry involved, which we won’t get
into here. So the measured dimensions are 3 and a half inches deep at the top,
the back is 15 and a half inches tall, the bottom is 8 inches, and the front
is actually 16 point one four inches which I’m rounding up to 16 and a half the two pillows are 20 and a half by 10
by 3 inches thick. If you’ve downloaded the worksheet, you’ll see the diagram that
shows you how to book wrap the wool around the foam. If you’re not familiar
with the book-wrap method, it might be helpful for you to watch the video ‘How
to Cut Wool Batting for a Latex Cushion’. You can see that link below this video – it gives a clear illustration of how the shapes I’m mapping out on paper fit
around the actual cushion. Starting with the seat cushion, the first thing I want to
do is check to see if the long dimension, which is the width in this case, will fit
across the 84 inch width of the batting. So I add 74 and a half plus
4 and a half for each end so that’s 74 and a half plus 9 equals
83 and a half, which just happens to fit perfectly within the 84
inch wool width. Next I map the 28 and a half inch
dimension of the cushion, and again add the 4 and a half inch cushion
thickness. The dotted lines represent the edges of the foam where the wool wraps
around it. Then I just need to add the other 28 and a half inch dimension. So
the parts of the cushion represented in this diagram are the FACE, the sides which are also called the BOX, and the other FACE and the places marked with an X
or scratched out are the sections that will be cut away to allow folding and
fitting of the batting around the foam. The final step is to add together the
four dimensions along the side here. So my calculations tell me I need 66 inches
of batting to wrap this seat cushion. The wedge-shaped back cushion gets a
slightly different treatment. Instead of a single book-wrapped piece, I’ll end up
with three separate pieces: one large piece to wrap around the top back bottom
and front of the cushion, plus two wedge-shaped end pieces.
Note that the large piece has no cutouts since there’s no wrapping around at the
ends. When I add up the dimensions along the side, I get 43 and a half
inches as the length of wool needed to wrap the back cushion. When mapping the pillows and end pieces, I find I can fit all of them across the 84 inch batting
width with the 20 and a half inch pillow dimension of both pillows across
the width, I add the 10 inch dimension down the side along with the 3 inch
boxing to get a total of 26 inches. Finally, I can see that the wedge-shaped
end pieces will fit easily in the remaining space. When I add up the totals
for each cushion along the side, which is 66 inches for the seat cushion 43 and a half inches for the back cushion and 26 inches for the pillows
and back cushion end pieces, I get 135 and a half
inches. I divide that by 36 to get 3.76 yards of wool, which I
round up to 4 yards, because it’s nice to have a little extra when cutting. So
that’s it: I need 4 yards of 84 inch wide Premium Wool Batting for this
Minerva sofa project. Got Questions? Just ask them in the comments below this
video. Thanks for watching! If you found this video helpful be sure to subscribe
and share it with your friends!

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