Marker placement calculator

Set Up

• Starting chain
  Ch a multiple of 16 to match your neckline size and check it fits comfortably over your head. Sl-st to the back bump of the first ch to join in the round, being careful not to twist the chain
• Shell set up
  Place st-dc (counts as first dc) and 1 dc in back bump of same ch - half shell. (Skip 3 ch, shell in back bump of next ch) repeat until 3 ch remain. Skip last 3 ch, 2 dc in same ch as half shell, ch-1, sl-st to top of st-dc - completes final shell at join.
• Step 1: Calculate raglan pointsdoes not count
  The yoke will now be divided into 4 panels: front, back, left sleeve, and right sleeve. You’ll place 4 stitch markers to indicate where your raglan increases will go on each round. These are placed between specific shells to mark the panel boundaries. There’s a small amount of maths needed to place your stitch markers correctly, but it’s simple and only needs to be done once. Calculate the number of shells in each panel if shells are distributed equally between them (x): 
x = starting chain / 16. Calculate the number of shells for each front / back panels (a) and sleeve panels (b)

If starting chain is multiple of 32: 
a = x + 1
b = x - 1 Else:
a = x
b = x
• Step 2: Place markersdoes not count
  PM1 after shell [x / 2], PM2 [b] shells after PM1, PM3 [a] shells after PM2, 
PM4 [b] shells after PM3 You should now have [a] shells between PM1 and PM4.

Pattern Repeat

• Increase between shells
  Half shell in ch-1 sp of joining shell, then shell in each ch-1 space between markers. At each marker, place a shell in the marked gap between shells.
Finish with half shell, ch-1, sl-st to top of st-dc. Move markers into the ch-1 spaces of the new raglan shells.
• Spikes
  Half shell in ch-1 sp of joining shell, ch-2, place spike between shells, ch-2, (shell in next ch-1 sp, ch-2, spike, ch-2) repeat til you reach joining shell again. Finish with half shell, ch-1, sl-st to top of st-dc. Move markers into the ch-1 spaces at raglan points.
• Increase within shells
  Half shell in ch-1 sp of joining shell, then shell in each ch-1 sp between markers. At each marked ch-1 sp, place an increase shell (2 dc, ch-1, 2 dc, ch-1, 2 dc) Finish with half shell, ch-1, sl-st to top of st-dc. Move markers between the ch-1 spaces at raglan points.
• Shells
  Half shell, then shell in each ch-1 space around. Finish with half shell, ch-1, sl-st to top of st-dc. Move markers between shells at raglan points, as you did after Set up row 1.
• Spikes
  Half shell, ch-2, spike, ch-2, (shell in next ch-1 sp, ch-2, spike, ch-2) repeat to end. Finish with half shell, ch-1, sl-st to top of st-dc. Move markers to spike stitches at raglan points
• Shells
  Half shell, then shell in each ch-1 space around. Finish with half shell, ch-1, sl-st to top of st-dc. Move markers between shells at raglan points.