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Sparrow Loop

Crochet in the round, counted stitch by stitch.

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PatternHomeBy The Hook Desk23 Oct 2026

Concentric ring coaster, 11 cm

How do I crochet a coaster that stays perfectly flat?

Hook
3.5 mm
Yarn
Worsted cotton (#4), approx. 20 g
Gauge
16 hdc and 14 rounds = 10 cm
Finished
11 cm diameter, 4 mm thick

Six rounds, one colour or six, cotton so it survives hot mugs. Worked in joined rounds so the ring boundaries are visible — the concentric lines are the design, not an artefact.

Materials

  • 20 g worsted cotton, one or six colours
  • 3.5 mm hook
  • Blunt tapestry needle
  • Spray bottle for a light block

Abbreviations

  • hdc = half double crochet
  • ch = chain
  • sl st = slip stitch
  • inc = 2 hdc in one stitch
  • MR = magic ring
Seven rings, eight stitches apart: the constant +8 is what keeps an hdc disc flat without blocking.
Round-by-round schematic Seven rings, eight stitches apart: the constant +8 is what keeps an hdc disc flat without blocking.

Round by round

Open any round to read what happens in it.

R1 · 8 sts

MR, ch 2, 7 hdc into the ring, join with sl st to the top of the ch 2. 8 stitches.

R2 · 16 stsinc

Ch 2, inc in each stitch around, join. Do not count the ch-2 as a stitch.

R3 · 24 stsinc

Ch 2, (1 hdc, inc) around, join.

R4 · 32 stsinc

Ch 2, inc, 2 hdc, then (inc, 2 hdc) seven times, join. The offset avoids a visible spoke.

R5 · 40 stsinc

Ch 2, (3 hdc, inc) around, join.

R6 · 48 stsinc

Ch 2, 2 hdc, inc, then (4 hdc, inc) seven times, 2 hdc, join. Fasten off.

R7 · 48 sts

Optional border: 1 round of reverse sc (crab stitch) into the round-6 stitches, working right to left. Gives a firm rim that stops the edge curling after washing.

Finishing

  1. Mist lightly and press flat with your palm, not an iron. Cotton hdc holds its flatness after one light block.
  2. Stack finished coasters and press them under a book for an hour; the stack settles the rims.
  3. Do not machine dry cotton coasters — the first hot dry shrinks them 4% and they stop matching each other.

If it goes wrong

The disc ripples at the edge.

You are counting the ch-2 as a stitch. Stop, and the ripple disappears by round 4.

The disc curls into a bowl.

The increases are too few for your gauge. Add one extra increase round of 8 before round 6.

The mug sticks to the coaster.

The cotton is not dense enough. Go down to 3.0 mm; the same stitch count in a tighter fabric gives a smoother surface.

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