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Decrease 1 stitch evenly across 30 stitches
The answer
In the round: K28, K2tog
Flat (balanced row): K14, K2tog, K14
Check: the round uses 30 stitches and ends with 29. The flat row uses 30 and ends with 29.
Markers (in the round): place a marker after stitch 28 of the old round, then work each K2tog just after a marker.
How it is worked out
You have 30 stitches and need 29, so you work 1 K2tog move. Each K2tog uses 2 stitches, so 2 stitches go into decreases and 28 stay plain: (30 − 2) ÷ 1 = 28 exactly, so every section is the same.
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Questions people ask
How do I decrease 1 stitch evenly across 30?
Work 1 section, each made of plain stitches and one K2tog. In the round: K28, K2tog. You end with 29 stitches.
How do I decrease 1 stitch evenly in a flat row of 30?
Split one section between the two edges so the shaping sits away from the edges: K14, K2tog, K14. You end with 29 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.