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Decrease 12 stitches evenly across 120 stitches
The answer
In the round: [K8, K2tog] 12 times
Flat (balanced row): K4, [K2tog, K8] 11 times, K2tog, K4
Check: the round uses 120 stitches and ends with 108. The flat row uses 120 and ends with 108.
Markers (in the round): place a marker after stitch 8, 18, 28, 38, 48, 58, 68, 78, 88, 98, 108, 118 of the old round, then work each K2tog just after a marker.
How it is worked out
You have 120 stitches and need 108, so you work 12 K2tog moves. Each K2tog uses 2 stitches, so 24 stitches go into decreases and 96 stay plain: (120 − 24) ÷ 12 = 8 exactly, so every section is the same.
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Questions people ask
How do I decrease 12 stitches evenly across 120?
Work 12 sections, each made of plain stitches and one K2tog. In the round: [K8, K2tog] 12 times. You end with 108 stitches.
How do I decrease 12 stitches evenly in a flat row of 120?
Split one section between the two edges so the shaping sits away from the edges: K4, [K2tog, K8] 11 times, K2tog, K4. You end with 108 stitches.
Does it work for crochet?
Yes. Tap Crochet (US) or Crochet (UK) in the calculator on this page. A crochet decrease uses 2 stitches of the row, so the plain counts change; the calculator works them out.