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Mermaid Tail Blanket in Bulky Waves

A cozy oversized blanket shaped like a mermaid tail, perfect for lounging and imaginative play.

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Difficulty
🟢 Beginner
Time
⏱️ 8-12 hours
Hook
🪡 J / 6mm
Yardage
🧶 approximately 1200 yards
Finished Size
📏 36 inches long x 39 inches wide at top
⚠️
Always make a gauge swatch before starting!
Gauge: 11 sc x 12 rows = 4 inches in single crochet
Adjust hook size as needed to match gauge.
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At a Glance

The Mermaid Tail Blanket in Bulky Waves is a free Beginner-level blanket pattern using Bulky weight yarn with a J / 6mm hook . Estimated time: 8-12 hours. Finished size: 36 inches long x 39 inches wide at top. You'll need approximately approximately 1200 yards of yarn.

33 steps across 4 sections  ·  Free under CC BY-NC-SA 4.0 — you can sell finished items

🛒 Materials

Bulky weight yarn - Main color (mermaid scale shade)
900 yards in teal, purple, blue, or iridescent colorway
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Bulky weight yarn - Accent color (shell/belly shade)
300 yards in cream, white, or complementary color
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Crochet hook
J / 6mm aluminum or bamboo hook
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Yarn needle
Tapestry needle for weaving in ends
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📖 Abbreviations

View full dictionary →
ch — chain → sc — single crochet → dc — double crochet → hdc — half double crochet → sl st — slip stitch → st(s) — stitch(es) → rnd — round → inc — increase → dec — decrease →

Tap any abbreviation to look it up. Start a free 7-day Maker trial for full stitch details.

📌 Before You Begin

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This blanket is worked flat from top to bottom, starting at the shoulders and tapering to a point at the tail fin.

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Use stitch markers to mark the beginning of each row for accuracy.

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Main color (MC) is used for the majority; Accent color (AC) is used for belly stripe detail.

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Double crochet (dc): Yarn over, insert hook into stitch, yarn over and pull through (3 loops on hook), yarn over and pull through 2 loops, yarn over and pull through remaining 2 loops.

🧶 Pattern Instructions

💡 Tip: Keep tension consistent and use stitch markers on the first and last stitches of each row to prevent rolling edges. For Rows 17-18, use stitch markers at st 27 and st 81 to track color changes.
  1. Row 1
    With MC, ch 109. Sc in 2nd ch from hook and in each ch across. (108 sts)
  2. Row 2
    Ch 1, turn. Sc in each st across. (108 sts)
  3. Rows 3-15
    Ch 1, turn. Sc in each st across, maintaining 108 sts for 13 rows total.
  4. Row 16
    Ch 1, turn. Sc in first 27 sts with MC. Sc in next 54 sts with AC (change to AC after st 27). Sc in last 27 sts with MC (cut AC after st 81, rejoin MC for final 27 sts). (108 sts: 27 MC + 54 AC + 27 MC)
  5. Rows 17-18
    Ch 1, turn. Using two balls of yarn (MC and AC), work with MC for first 27 sts, AC for center 54 sts, and MC for last 27 sts. Carry unused yarn along the edge or use bobbins to prevent tangling. Sc in each st across maintaining color placement. (108 sts)
  6. Row 19
    Ch 1, turn. Cut AC. With MC only, sc in each st across entire row. (108 sts)
Row counter:
💡 Tip: Decreases are spaced further apart to create a gradual, natural taper.
  1. Row 20
    Ch 1, turn. Sc2tog, sc in each st to last 2 sts, sc2tog. (106 sts)
  2. Rows 21-25
    Ch 1, turn. Sc in each st across. (106 sts for 5 rows)
  3. Row 26
    Ch 1, turn. Sc2tog, sc in each st to last 2 sts, sc2tog. (104 sts)
  4. Rows 27-30
    Ch 1, turn. Sc in each st across. (104 sts for 4 rows)
  5. Row 31
    Ch 1, turn. Sc2tog, sc in each st to last 2 sts, sc2tog. (102 sts)
Row counter:
💡 Tip: Rows 56-58 create a rapid taper that forms a natural pointed fin. The stitch count progresses as: 56→28→14→7 sts. If a less pointed finish is desired, add 1-2 rows of single crochet at 14 sts or 7 sts before the final point.
  1. Rows 32-35
    Ch 1, turn. Sc in each st across. (102 sts for 4 rows)
  2. Row 36
    Ch 1, turn. Sc2tog, sc in each st to last 2 sts, sc2tog. (100 sts)
  3. Rows 37-38
    Ch 1, turn. Sc in each st across. (100 sts for 2 rows)
  4. Row 39
    Ch 1, turn. Sc2tog twice, sc in each st to last 4 sts, sc2tog twice. (96 sts)
  5. Rows 40-41
    Ch 1, turn. Sc in each st across. (96 sts for 2 rows)
  6. Row 42
    Ch 1, turn. Sc2tog twice, sc in each st to last 4 sts, sc2tog twice. (92 sts)
  7. Rows 43-44
    Ch 1, turn. Sc in each st across. (92 sts for 2 rows)
  8. Row 45
    Ch 1, turn. Sc2tog 3 times, sc in each st to last 6 sts, sc2tog 3 times. (86 sts)
  9. Rows 46-47
    Ch 1, turn. Sc in each st across. (86 sts for 2 rows)
  10. Row 48
    Ch 1, turn. Sc2tog 4 times, sc in each st to last 8 sts, sc2tog 4 times. (78 sts)
  11. Rows 49-50
    Ch 1, turn. Sc in each st across. (78 sts for 2 rows)
  12. Row 51
    Ch 1, turn. Sc2tog 5 times, sc in each st to last 10 sts, sc2tog 5 times. (68 sts)
  13. Rows 52-53
    Ch 1, turn. Sc in each st across. (68 sts for 2 rows)
  14. Row 54
    Ch 1, turn. Sc2tog 6 times, sc in each st to last 12 sts, sc2tog 6 times. (56 sts)
  15. Row 55
    Ch 1, turn. Sc in each st across. (56 sts)
  16. Row 56
    Ch 1, turn. Sc2tog across entire row. (28 sts)
  17. Row 57
    Ch 1, turn. Sc2tog across entire row. (14 sts)
  18. Row 58
    Ch 1, turn. Sc2tog 7 times. (7 sts). This creates the final tapered point.
  19. Row 59
    Ch 1, turn. Sc in each st across. (7 sts). Cut yarn leaving 6-inch tail.
Row counter:
💡 Tip: Shell stitch adds texture and resembles mermaid scales. Work loosely to allow the edging to lay flat. Each shell consists of 3 double crochets separated by chain-1 spaces in a single stitch; each shell is separated from the next by a skip of 2 stitches and a single crochet in the following stitch.
  1. Step 1
    Rejoin AC with st">sl st to any st along the long edges of blanket.
  2. Step 2
    Shell stitch pattern: Ch 1, sc in same st as join. *Sk 2 sts, work (dc, ch 1, dc, ch 1, dc) in next st to form a shell (3 double crochets with chain-1 spaces between), sk 2 sts, sc in next st*. Repeat from * to * around entire perimeter, adjusting spacing at corners as needed. Sl st to first sc to join. Double crochet: Yarn over, insert hook into stitch, yarn over and pull through (3 loops on hook), yarn over and pull through 2 loops, yarn over and pull through remaining 2 loops.
  3. Step 3
    Fasten off AC, cut yarn leaving 6-inch tail.
Row counter:

✂️ Finishing

Weave in all yarn ends with tapestry needle, securing tails on wrong side. Block blanket gently to even out edges if desired. To create a cohesive mermaid look, you may optionally add a simple sequin or shell embellishment to the tail fin point. Lay flat to dry completely before use.

🧺 Care Instructions

Hand wash in cool water with mild detergent. Gently squeeze out water; do not wring. Lay flat to dry away from direct heat and sunlight. Do not bleach or dry clean. May be machine washed on gentle cycle in mesh bag if yarn fiber permits. Refer to yarn label for specific care instructions based on fiber content.

🤖 This pattern was generated by AI and may contain errors. Always test your gauge before starting.

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Questions About This Pattern

Absolutely — just match the weight (Bulky). You'll need about approximately 1200 yards, so make sure your substitute has enough meterage. Bulky yarns work up fast and have more visible stitch texture — try wool or wool-blend for best results.
Yes! This is one of the friendlier patterns to start with. You only need to know: ch, sc, dc, hdc. Work slowly, count your stitches at the end of each row, and don't be afraid to frog (rip back) and redo a section — that's how everyone learns. Budget about 8-12 hours; beginners often take a bit longer, and that's totally fine.
Find the stitch repeat in the pattern (usually mentioned in the foundation chain section) and add or remove multiples of that number. Keep in mind: with Bulky yarn, every extra inch of width across a blanket adds meaningful yardage — double the size means roughly 4× the yarn. For a baby blanket, halving the dimensions works well as a starting point.
For this pattern, gauge is "11 sc x 12 rows = 4 inches in single crochet". For decorative or non-fitted items it's less critical, but matching gauge ensures you use the right amount of yarn and get the proportions the pattern intends. If your swatch is too small (too many stitches/inch), go up a hook size. Too large — go down.
Hand wash in cool water with mild detergent. Gently squeeze out water; do not wring. Lay flat to dry away from direct heat and sunlight. Do not bleach or dry clean. May be machine washed on gentle cycle in mesh bag if yarn fiber permits. Refer to yarn label for specific care instructions based on fiber content. A general rule: when unsure about the yarn, hand wash in cool water with a drop of gentle detergent, squeeze (don't wring), and block flat to dry. This is safe for almost every fiber.
Each section builds on the last, so yes — follow them in order. That said, some finishing sections (like embellishments or optional edging) can be skipped if you prefer a simpler look. Read through all sections before starting so you understand how the pieces fit together and can plan your yarn usage across sections.
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