A crochet increase is two stitches worked into one, which spends a stitch of the row below, so its spacing differs from knitting’s. Enter your counts and the increase round comes back written out and balanced.
Your Increase Row
Increase Row
6increases
60 stitches to 66, in the round
[sc 9, 2 sc in next st] × 6.
- Stitches now60
- Stitches after66
- Plain between increases9
The Formula
increases = after − now · plain between = (now − increases) ÷ increasesWorking two stitches into one spends one stitch of the row below, so the plain groups divide (now − increases), not the full count. Divide the full count and the last repeat runs out of stitches two short.
Worked Example
A round of 60 increasing to 66:
- Six increases spend six stitches; 54 plain spread across six gaps → 9 each.
- Written out: [sc 9, 2 sc in next st] × 6. Count after: 66.
- For a flat circle growing every round, the circle calculator runs this logic round after round with the increase count fixed.
Crochet Gauge by Yarn Weight
| Weight | Sc per 4 in | Usual hooks |
|---|---|---|
| 1 · Super fine | 21–32 | B-1 to E-4 (2.25–3.5 mm) |
| 2 · Fine (sport) | 16–20 | E-4 to 7 (3.5–4.5 mm) |
| 3 · Light (DK) | 12–17 | 7 to I-9 (4.5–5.5 mm) |
| 4 · Medium (worsted) | 11–14 | I-9 to K-10½ (5.5–6.5 mm) |
| 5 · Bulky | 8–11 | K-10½ to M-13 (6.5–9 mm) |
| 6 · Super bulky | 7–9 | M-13 to Q (9–15 mm) |
| 7 · Jumbo | 6 or fewer | Q and up (15 mm +) |
Reading the Instruction
- [sc 9, 2 sc in next st] × 6: six repeats of nine singles then an increase.
- Stagger increase rounds in amigurumi the same as decreases, or the growth prints corners instead of a curve.
- Flat rows keep the leftover plain stitches at the edges.
Assumptions and Defaults
- Wording follows your stitch (sc, hdc, dc); spacing is identical for all.
- Doubling the round (6 to 12, amigurumi round 2) writes as an increase in every stitch.
- More than doubling in one round isn’t spaceable; the calculator suggests two rounds.
Increase Questions, Answered
How do I increase evenly in crochet?
To increase evenly in crochet, spread (stitches − increases) ÷ increases plain stitches between the increases, so going from 60 to 66 stitches is [sc 9, 2 sc in next st] × 6. The subtraction matters because each increase is worked into a stitch and uses it up.
Why not divide by the full stitch count like knitting?
Crochet can’t divide by the full stitch count because a knitting M1 adds a stitch between stitches and uses none, whereas a crochet increase works two stitches into one and uses one. Crochet groups therefore divide 54 stitches where knitting would divide 60, which is why knitting calculators mis-space crochet rows.
How do amigurumi increase rounds work?
Amigurumi increase rounds add the same number of stitches every round, usually six for sc, which keeps the circle flat. Round 3 of a sphere is [sc 1, inc] × 6, round 4 is [sc 2, inc] × 6, and so on, which is exactly this calculator’s method with the increase count held at six.
What if I need to more than double my stitches?
A single round can at most double the stitch count, with an increase in every stitch. To grow further, work two increase rounds instead; the fabric also lies better when it grows in two steps rather than one.
Gauge and hook ranges: Craft Yarn Council yarn weight standards.