I know my previous post on set-in sleeves, though intended to be simple, was still a welter of lots of words and formulas and scary things. For your (and my) immediate sleeve-designing needs, here’s a cheat-sheet with just the formulas for calculating a basic set-in sleeve.
Shaping a Set-In Sleeve Cap Using Armscye Measurements
|Numbers to Measure|
|A: The inches of your initial armpit bindoff in the sweater body||______|
|B: Half the perimeter of your armscye, in inches||______|
|C: The final bindoff of the sleeve cap, which is typically between 2″ and 2.5″||______|
|D: Half the width of your sleeve at its widest point||______|
|Numbers to Calculate|
|F: Armscye perimeter unaccounted for after initial and final bind offs: F = B – (A + C)||______|
|G: Half sleeve width minus initial bind off: G = D – A||______|
|X: Height of sleeve cap: X2 = F2 – G2||______|
|H: Width to decrease away: H = G – C||______|
|Convert H to stitch gauge: H*||______|
|Convert X to row gauge: X*||______|
Your Sleeve Cap Instructions
Decrease H* stitches evenly on each side across X* rows, in addition to initial bind off A and final bindoffs 1/2 C and 1/2 C, to create your sleeve cap. Never decrease more than one stitch per side per row. If you have too few rows, add some additional rows to the sleeve cap, and remember: Too big is better than too small.