Report a problem

Crochet coaster pattern: one piece, nine rounds, six more stitches each time

A free crochet coaster pattern for a disc ~10 cm across, worked on a 4.0 mm hook in one colour, under an hour's work. Every round is the round before it with six more stitches in it — six into a magic ring, then 12, 18, 24 and on out to 48 — so there is one rule to learn and nothing else changes; round 9 does nothing but slip stitch the last stitch to the first and fasten off. All nine rounds are written out below for the single piece, with the number of stitches it leaves you on printed beside it.

Maths verified, not yet made. Every one of the 9 rounds was checked against the round before it by machine — the counts, the increases and the decreases all add up. What nobody can promise you yet is how it sits in the hand.How we check
6 of 8 checks ran on 2026-09-04
  • 1 format and stitch chainscripts/validate.py — 113 patterns, all counts chain.
  • 2 catalogue auditscripts/audit-patterns.py — 113 audited, 0 errors, 66 warnings.
  • 3 geometrygeometry-check.py — 113 checked, 0 errors, 4 warnings.
  • 5 not a duplicate113 distinct display names across 113 patterns
  • 6c target on the recordseo.headKeyword, confidence and demand present and cross-checked by scripts/validate.py
  • 8 page readinessscripts/check-completeness.py --gate — 0 required fields missing, 114 editorial flags, 0 unearned claims.
Not yet checked
  • 4 render matches the pattern — no image has been compared against its own prompt, so a render showing a piece the rounds do not make would not be caught here. Nothing has counted how many do.
  • 6a recognisability — provenance.recognisability is empty in every pattern, so there is no feature list to check the parts against.
Why it is rated Beginner

Beginner: one piece, one stitch and one rule — six increases a round, spread evenly, from six stitches out to 48. Nothing is sewn and nothing is stuffed.

Sell what you make. Anything you crochet from this pattern is yours to sell — any quantity, no fee, no credit required.

00
00

What you need before you start

gather it once, in one place
Expand

Yarn — one colour, weight 4

Blush1 ballCotton double knit

Tools

2 you probably own

You likely have

Tapestry needle
Scissors

Optional

Stitch marker

Gauge and finished size

the last check before you cast on
Tension
Tight enough that the disc lies flat. If it cups, loosen; if it ruffles, tighten.
Finished size
~10 cm across
Any smooth cotton double knit works on the 4.0 mm hook. Cotton is what makes this a coaster rather than a mat: wool takes water up and holds on to it.

How to make the shell coaster

9 rounds in one piece.

Switching rewrites every round:US6 sc in a magic ring→UK6 dc in a magic ringWork a US sc as a UK single crochet and the fabric comes out looser and taller.
1
01

The coaster

One flat disc. Every round is the round before it with six more…9 RNDS
starts in blush· magic ring· Piece 1 of 1

One flat disc. Every round is the round before it with six more stitches in it.Block it under a damp cloth overnight and it will lie properly flat.

Rounds 1 to 6 of The coaster: 6, 12, 18, 24, 30, 36 stitchesFirst six rounds[6] [12] [18] [24] [30] [36]
16 sc in a magic ring[6]
2inc x6[12]
3(1 sc, inc) x6[18]
4(2 sc, inc) x6[24]
5(3 sc, inc) x6[30]
6(4 sc, inc) x6[36]
7(5 sc, inc) x6[42]
8(6 sc, inc) x6[48]
9sl st to join, fasten off[48]
US termsMRmagic ringscsingle crochetincincreaseststitch
When this piece is doneThe coaster is done.A flat circle is the whole of working in the round. Everything else is this, curved.

Two notes on the shell coaster

Read them
01Worked in a spiral — nothing to join, nothing to turn.
02Every round is the round before it with six more stitches in it.

Four questions this pattern answers

Not questions anybody asked. Each one is written from this pattern's own record, and every answer is read off the fields it names.

Can the shell coaster be made with a different hook or yarn?

Any smooth cotton double knit works on the 4.0 mm hook. Cotton is what makes this a coaster rather than a mat: wool takes water up and holds on to it.

Is there a gauge to match for the shell coaster?

No stitches-to-the-centimetre figure to match, because nobody has swatched this one; what the pattern asks for instead is a technique: tight enough that the disc lies flat. If it cups, loosen; if it ruffles, tighten.

What hook will the shell coaster need, and what is the finished size?

A 4.0 mm hook, US G/6. Finished, it comes out ~10 cm across; the leading tilde is there because that came off the stitch counts rather than a tape measure.

How long will the shell coaster take to crochet?

About three quarters of an hour. That is 9 rounds of the shell coaster, worked as one piece, coming to 180 single crochet and 42 increases, and the hours are an estimate rather than a timing of anybody making it.

A round that will not add up?
Tell us the piece and the round number — the stepper already knows where you are.There is nowhere to send one yet.
Report a problem
Put the laptop down mid-round
The iPhone app keeps your place — and hands it back where you left it.
Get the app

More home patterns

All 113 patterns
Scrunchie, crocheted, on a plain backgroundScrunchieHome · Beginner3.5 mm hook · 8 roundsCitrus slice coaster, crocheted, on a plain backgroundCitrus slice coasterHome · Beginner3.5 mm hook · 7 roundsWorry pet, crocheted, on a plain backgroundWorry petHome · Beginner4 mm hook · 11 roundsBaby rattle ring, crocheted, on a plain backgroundBaby rattle ringHome · Beginner4 mm hook · 12 roundsSolid square, crocheted, on a plain backgroundSolid squareHome · Beginner4 mm hook · 6 roundsEar warmer, crocheted, on a plain backgroundEar warmerHome · Beginner4 mm hook · 15 rounds
Piece 1 of 1The coaster0 OF 9 ROUNDS WORKED
Round1/96 sc in a magic ring[6]
Start at round 1