If you have a supply of large compasses, you’re in luck, and can easily draw yourself all sizes of circles. We can use 38⅝” as the width of the fabric piece you are cutting for your tube. Harumph! The table below will give you a close-enough ruler match. If you already deal with the metric system, you rock – no conversion necessary.įor those of us in the world of inches, you need to find a yardage conversion. If you are using Pi, remember it always returns a decimal number. For example, a tall duffle bag might be 30″ in height whereas a shorter bucket might be only 10″.Ĭonverting a Decimal to a US Ruler Measurement The height of your fabric cut is variable and dependent on your project. The circle should start as 13″ in diameter. If you use a standard ½” seam allowance, you need to add 1″ to the diameter of your circle ( the diameter increases by double the seam allowance) and 1″ to the width of your fabric (½” for both sides of the seam allowance). (This works with the metric system as well: 3.14 x 30 cm = 94.2 cm)Īn important step many people miss at this point is forgetting to add extra (to both pieces) for the seam allowance. The formula: 3.14 (π) x diameter = circumferenceĮxample: You want a finished 12″ diameter base (a 12″ diameter circle) in a duffle bag.
GETTING A PERFECT CENTER POINT MEASURE HOW TO
That width is the circumference of the circle that will be inserted into the tube (we have a great step-by-step tutorial on how to insert a circle into a tube). If you know the diameter of your circle, you can use a standard formula to figure out the width of the fabric cut needed to make a tube.
Π or Pi: the name given to the ratio of a circle’s circumference to its diameter, expressed as the decimal 3.14 How wide to cut fabric to fit a circle Radius: the distance from the center of the circle to the outside edgeĭiameter: the distance across a circle through its center pointĬircumference: the distance around the outer edge of a circle Let’s start with remembering what all the parts of a circle are called and how Pi (π) fits into the mix. We’ve also included a handy conversion from decimals to inches, which is necessary when working with Pi. We’ll show you the parts of a circle, how wide to cut fabric to fit a circle, and how to draw a circle without a pattern. We’re here today to help you with the steps you’ve forgotten since high school geometry class (or maybe never learned because you were too busy passing notes with Susan Ellery!). However, trying to draw a perfect circle without a pattern is a challenge, and figuring out the proper size of an opening into which a circle can be inserted requires working with Pi (or π), which is not the delicious kind you can eat with a bit of ice cream. Don’t get me wrong I like all those squares, rectangles, triangles, octagons, and whatnot but the circle is the coolest of the bunch: smooth and pretty and endlessly useful. The circle is, in my humble opinion, the Queen of the geometric shapes.
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