Pattern Download

I Love Pi


Skill Level


What You Get

  • 1 digital pattern (instant download)
  • Free Pattern Updates

How it works

  • This pattern was designed by a Craftsy independent design partner!
  • You'll purchase through PayPal and all profits go to the designer.
  • After purchase find your pattern in your pattern library.


A well-known fact about me is my ongoing and eternal love of pie. I have never met a (dessert) pie that I didn't like, and am unable to pick just one favorite. Apple? Berry? Key lime? Chess? Pecan? Peach cheesecake? Sweet potato? But I also love the mathematical constant pithat is, the ratio of the circumference of a circle to its diameter, or 3.1415926535 (and so on). Math team cheers need it, calculations of distance, momentum, and volume need it in every branch of math, science, and engineering, and it's fun to yell at sporting events when there's 3:14 left on the timeclock. This hat uses the principle of pi in two ways. First, it is worked top-down with increases worked until the diameter of the knitting is 1/3.14 of the desired circumference. Second, the welting pattern of alternating knit and purled bands follows the digits of pi! The sample shown uses approximately 80 yards of bulky weight yarn, spun and N-plied from past PhatFiber Sampler Box fluff samples. This is a great project for such "monster yarn" - but it would also look great in a more normal handspun or commercially made yarn. BASIC SKILLS NECESSARY Knitting in the round Knit & purl patterning GAUGE 11 stitches and 16 rows = 4 inches in stockinette stitch SIZING / FINISHED MEASUREMENTS Fits adult heads 21-24"

Recommended with this pattern

  • 75 - 90 yards (69 - 82 m) bulky weight handspun or commercial yarn
  • US11 (8mm) circular and/or double pointed knitting needles
  • Yarn needle

Sold by

Katherine Vaughan Designs
Katherine Vaughan Designs
I’m a lifelong knitter, from a family of knitters, gardeners, seamstresses, and sailors (yes, even the men!) - who also happen to be doctors, scientists, priests, and businesspeople (yes, even the women!). I like to design baby blankets, accessories for children, adults, and the home, and garments for children and adults. You can find my patterns through my indie line here on Craftsy or in a variety of print and online magazines and books. I happily work with local yarn stores, crafters, and indie dyers: please contact me to start a conversation about how we can support each other! I’m a certified knitting teacher, accomplished technical editor for knitting patterns, and in my daily life am an academic science librarian.

Get your first class for only $14.99

Get your first class for only $14.99