The Weekend Folio

Free pattern

Free Crochet Coaster Pattern (Set of 4)

· beginner · about 2 hours

One coaster uses 18 yards of worsted weight cotton on a 4.0 mm (US G-6) hook — 72 yards for a set of four, or one standard 2 oz ball with a little left over. It is worked in joined rounds of single crochet to a 4.25 inch circle, deliberately one hook size down from what the yarn label suggests: a coaster has to be dense enough to block condensation and lie dead flat, and loose stitches do neither. A set takes about two hours.

A stack of round cotton crochet coasters beside one in use under a glass, tight stitches visible

A coaster is the best first project in the round there is: it teaches the magic ring, the increase logic that makes circles flat, and an invisible finish — and if it goes wrong, it cost you eighteen yards and half an hour. This one is written with the numbers that make a coaster actually function, because a coaster has a job.

Density is the specification

The yarn label for worsted cotton says 5.0 or 5.5 mm. This pattern says 4.0 mm, and that difference is the whole design. A coaster exists to stop water reaching wood: worked tight, single-crochet cotton is a thick absorbent mat; worked at label gauge it is a doily with gaps a sweating glass drips straight through. If your fabric shows daylight between stitches, go down another hook size — the stiffness that feels wrong for a garment is correct here.

The flat-circle rule, visible

Every round adds 8 stitches: 8, 16, 24, 32, 40, 48. That is the single-crochet circle constant — circumference grows by about one stitch-width per round per 2π, and 8 increases keeps pace. The pattern makes the rule visible so you can adjust it: ruffling means you personally need fewer increases (your stitches are wider than average), cupping means more. Round 7’s increase-free lap is a deliberate brake that firms the rim.

Where the yardage figure comes from

Finished coasters, weighed: 8 g each in standard kitchen cotton, at 2.2 g per 5 yards — 18 yards per coaster, 72 for the set. Yarn requirements on this site are measured this way rather than estimated, which is why they come with a decimal of confidence: buy one 95-yard ball and you will finish four coasters. Loose crocheters, buy the second ball anyway; going up 15% is normal for a relaxed tension.

Abbreviations

US crochet terms throughout.

  • ch — chain
  • sc — single crochet
  • st(s) — stitch(es)
  • sl st — slip stitch
  • inc — increase (2 sc in the same stitch)

The pattern

  1. Round 1 Start with a magic ring and work 8 sc into it, then pull the tail to close and sl st to the first sc to join. 8 sts. (Alternative: ch 2, 8 sc in the 2nd ch from hook — the centre closes less tightly, but it works if the magic ring is still fighting you.)
  2. Round 2 Ch 1 (does not count as a stitch here or anywhere in this pattern). Inc in every st around, sl st to join. 16 sts.
  3. Round 3 Ch 1. *Sc 1, inc in the next st* around, sl st to join. 24 sts. Check gauge here: the piece should measure 2.5 in across. Wider, go down to 3.5 mm; smaller, up to 4.5 mm.
  4. Round 4 Ch 1. *Sc 2, inc* around, sl st to join. 32 sts. Rotate where each round starts by beginning a stitch or two further along — stacking every join in one column builds a visible seam line up the coaster.
  5. Round 5 Ch 1. *Sc 3, inc* around, sl st to join. 40 sts.
  6. Round 6 Ch 1. *Sc 4, inc* around, sl st to join. 48 sts.
  7. Round 7 Ch 1. Sc in every st around — no increases — sl st to join. 48 sts. This plain round firms the rim and stops the edge ruffling.
  8. Finishing Fasten off, thread the tail onto the yarn needle, and weave it through the back of the final round in two directions before trimming. Weave the starting tail into the closed centre the same way. Steam lightly under a damp cloth if the coaster cups — cotton flattens obediently.

Notes

  • Yardage measured by weighing: 18 yd per coaster in worsted cotton at this gauge, 72 yd for four. A standard 2 oz / 95 yd ball of kitchen cotton makes four coasters with about 20 yd spare — enough for a fifth if one is destined to live under a plant pot.
  • Cotton is not negotiable, and it is the answer to why not use up acrylic scraps: acrylic is plastic, and a hot mug on it can glaze or even melt the surface. Cotton takes heat, absorbs drips, and washes at any temperature.
  • If your circle ruffles like a lettuce leaf, you are increasing too fast for your tension — work Round 7 earlier (after Round 5) and add a second plain round at the end. If it cups into a bowl, the opposite: your tension is tight, add an extra increase round of *sc 5, inc* before the plain round.
  • The invisible finish for the very end: instead of the final sl st join, cut the yarn, pull it through, skip one stitch and thread the tail under both loops of the next, then back into the centre of the last stitch worked. The join disappears completely. Optional, and worth learning on a coaster rather than a blanket.
  • For a square coaster from the same maths: work Rounds 1–2, then ch 2 at four evenly spaced corners in every round instead of distributing increases. Same yarn, same density rules.

Common questions

What is the best yarn for crochet coasters?

Worsted weight cotton — the unglamorous kitchen-cotton sort is exactly right. It tolerates hot mugs, absorbs condensation instead of letting it pool, holds its shape, and machine washes. Acrylic can deform or glaze under a genuinely hot mug because it is plastic; wool felts with repeated damp and washing. Cotton has no failure mode a coaster will ever meet.

How many yards of yarn does one coaster use?

18 yards of worsted cotton at this pattern's gauge, measured by weighing finished coasters rather than estimating — so a set of four uses 72 yards, comfortably inside one 95-yard ball. Looser tension or a larger hook adds 10–15%. As a rule of thumb, any 4-to-4.5-inch single crochet circle in worsted lands between 16 and 22 yards.

Why does my crochet circle ruffle or cup instead of lying flat?

A flat circle needs its stitch count to grow at the same rate as its circumference — 8 stitches per round in single crochet. Ruffling means the count is growing faster than your stitches need (work a plain round to absorb the excess); cupping means slower (add an increase round). Tension moves the balance point, which is why the same written pattern behaves differently in different hands.

Are crochet coasters actually absorbent enough to work?

At the right density, yes — that is why this pattern runs a 4.0 mm hook on yarn labelled for 5.0 mm. Tight single crochet in cotton produces a thick, thirsty fabric that blocks condensation from reaching the table. Coasters made loosely at the label gauge have visible gaps between stitches and let a sweating glass drip straight through.

How long does a crochet coaster take to make?

About 30 minutes each once the first one has taught you the pattern — the first usually takes 45. A set of four is a two-hour project, which is also roughly one film. They are the standard recommendation for a first project in the round for exactly this reason: every skill in an amigurumi or a hat, at one-tenth the commitment.