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Increase 2 stitches evenly across 40 stitches
The answer
In the round: [K20, M1] 2 times
Flat (balanced row): K10, M1, K20, M1, K10
Check: the round uses 40 stitches and ends with 42. The flat row uses 40 and ends with 42.
Markers (in the round): place a marker after stitch 20, 40 of the old round, then work each M1 just after a marker.
How it is worked out
You have 40 stitches and need 42, so you work 2 M1 moves. Each M1 is made between stitches, so all 40 stitches are plain: 40 ÷ 2 = 20 exactly, so every section is the same.
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Questions people ask
How do I increase 2 stitches evenly across 40?
Work 2 sections, each made of plain stitches and one M1. In the round: [K20, M1] 2 times. You end with 42 stitches.
How do I increase 2 stitches evenly in a flat row of 40?
Split one section between the two edges so the shaping sits away from the edges: K10, M1, K20, M1, K10. You end with 42 stitches.
Does it work for crochet?
Yes. Tap Crochet (US) or Crochet (UK) in the calculator on this page. A crochet increase uses 1 stitch of the row, so the plain counts change; the calculator works them out.