Crochet Flat Circle Calculator

How to use

1. Pick your stitch: single, half-double or double crochet — taller stitches start with more stitches per round (6, 8, 12).
2. Enter how many rounds you want to work.
3. Read each round: the first round is worked into a magic ring, then each round adds an even set of increases, like [sc 2, 2 sc] × 6.
4. Offset the increases each round so they spiral rather than stack — a stacked circle turns into a hexagon.

Good to know

• A circle lies flat when the increases per round match the starting stitch count, which is set by stitch height: 6 for single crochet, 8 for half-double, 12 for double crochet.
• If the circle ruffles it is increasing too fast (or your gauge is loose); if it cups it is too tight — go up or down a hook size.
• For amigurumi, crochet tightly (often a hook size or two down) so the stuffing does not show through.

FAQ

What is the flat-circle rule (6, 8, 12)?

Each round of a flat circle adds the same number of stitches it started with, and that number depends on stitch height: 6 for single crochet, 8 for half-double, 12 for double. Add fewer and it cups; add more and it ruffles.

Why do my increases form corners like a hexagon?

Because they are stacking directly above each other. Move each round’s increases over by a stitch or two so they spiral around — the calculator’s brackets keep the count right; you choose where to place them.

How do I make it flat for amigurumi?

Amigurumi starts with the same flat-circle increases, then stops increasing to curve into a ball. Crochet tightly so there are no gaps, usually going down a hook size or two from the ball-band suggestion.