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Mermaid Blanket Pattern

This knit mermaid tail blanket is perfect for both adults and kids. Any sea princess in training is sure to love the colorful and comfy design.

Mermaid Blanket Pattern
Mermaid Blanket Pattern
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This Mermaid Blanket Pattern may be one of the cutest and most interesting knit blanket patterns out there. Using bright yarn, this knit blanket is actually a sack so you can slip your legs in and stay cozy while feeling like a mermaid. How cool is that?

This pattern would also be perfect for a daughter or granddaughter and you can work up a matching one for yourself! Just imagine the look of excitement on her face when she sees her new knit mermaid blanket.

So, if you want to be the coolest relative around, just grab your needles and start this free knitting pattern. You and your child will have matching mermaid tail blankets in no time.

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Knitting Needle Size11 or 8 mm, Circular Knitting Needles

Yarn Weight(6) Super Bulky/Super Chunky (4-11 stitches for 4 inches)

Gauge8 sts and 13 rows = 4" [10 cm] in stocking st.

Finished SizeChild Approx 46" [117 cm] circumference x 45" [114.5 cm] long (excluding tailfin). Adult Approx 64" [162.5 cm] circumference x 66" [167.5 cm] long (excluding tailfin).

Materials List

  • Bernat® Blanket Brights™ (10.5 oz/300 g; 220 yds/201 m)

    Child: Lemonade Varg (12012) - 3 balls or 570 yds/520 m

    Adult: Go-Go Green (12004) - 5 balls or 1050 yds/960 m
  • Size U.S. 11 (8 mm) circular knitting needles 36" [90 cm] and 16" [40.5 cm] long or size needed to obtain gauge
  • Stitch marker


The instructions are written for smaller size. If changes are necessary for larger size the instructions will be written thus ( ). Numbers for each size are shown in the same color throughout the pattern. When only one number is given in black, it applies to both sizes.


With longer circular needle, cast on 88 (124) sts. Join in rnd, placing a marker on first st.
1st rnd: *K1. P1. Rep from * around.
2nd rnd: *P1. K1. Rep from * around. Rep last 2 rnds Seed St Pat twice more.
Next rnd: Knit, inc 4 sts evenly around. 92 (128) sts.
Knit even in rnds until work from cast on edge measures 22 (36)" [56 (91.5) cm].
Shape body: Next rnd: *K21 (30). K2tog. Rep from * around. 88 (124) sts. Knit 5 rnds even.
Next rnd: *K20 (29). K2tog. Rep from * around. 84 (120) sts.
Knit 5 rnds even.
Next rnd: *K19 (28). K2tog. Rep from * around. 80 (116) sts.
Knit 5 rnds even.
Next rnd: *K18 (27). K2tog. Rep from * around. 76 (112) sts.
Knit 5 rnds even.
Note: Change to shorter circular needle when necessary to accommodate sts.
Cont dec 4 sts evenly (as established) around next and following 6th rnds until there are 44 (92) sts.
Adult Size only: Cont dec 4 sts evenly (as established) around next and following 4th rnds until there are 52 sts.
Both Sizes: Knit even in rnds until work from beg measures 45 (66)" [114.5 (167.5) cm]. Cast off. Sew cast off edge of Body tog.


Note: Tailfin is worked side to side with short-turn row shaping.
Cast on 42 (48) sts. Working back and forth across needle in rows, proceed as follows:
Knit 3 rows (garter st).
**Next row: (WS). Cast off 3 sts. Knit to last 4 sts. Turn. Leave rem 4 sts unworked.
Next row: Knit.
Next 2 rows: Knit across all sts.** Rep from ** to ** 8 (10) times more. 15 sts rem.
***Next row: (WS). Cast on 3 sts. Knit to last 4 sts. Turn. Leave rem 4 sts unworked.
Next row: Knit.
Next 2 rows: Knit across all sts.***
Rep from *** to *** 8 (10) times more. 42 (48) sts.
Cast off all sts.


Gather top edge of Tailfin to fit lower edge (cast off edge) of Body and sew in position.

  1. Click to enlarge the image of the adult version

  2. Click to enlarge the image of the child version


Knit next 2 stitches together
Right Side
Wrong Side

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how do I save it there is no save pattern button

I haven't seen very many knitted patterns for these mermaid sleep sacks but, I have seen ton of crocheted ones, so it is nice to see a free knitted one this is the perfect gift for any little girl because what little girl doesn't pretend she is a mermaid?

Can someone explain the tail fin part? Do I only leave 4 stitches unworked one time? It doesnt show where ends.

In order to shape the tail, you're using a technique called short row shaping, in short row shaping you will always leave some stitches unworked until they are worked back into the pattern later. You will leave the 4 unworked stitches each time the pattern tells you to do so, it is more than 1 time. The making of the tail is actually an 11 row shaping pattern repeated according to size, 8 for child 10 for adult. The patterns ends after the tail is completed and you are instructed to cast off. I know this is late, hope it helps someone.

I'm almost done with this pattern. When it says to sew the body together what stitch should I use? Thank you.

No where in this part are you instructed to sew the body together, it is knit in the round, the only sewing is attach the tail fin to the cast on row. Typically you would use a mattress stitch to attach the tail.

Oh thank God! A pattern that is not PDF and is sooo clear and easy to understand! Thank you SO much for this!

I've seen these mermaid blankets or sacks all over Pinterest, everybody likes the look. Some of the patterns I've looked at are pretty complicated, but this one is actually easier and has clear instructions. I like that the designer has made a larger sized version that will fit the middle school tweens who want one!

I love these mermaid sacks, I clicked on the link and the ravalry page also had a pattern for the child size version which is the one that I made. It was much easier to knit than I was expecting as the instructions are very clear. I decided to use a blue mix yarn rather than the pink as my daughter didn't like the colour of the one shown above. She loves it and it is great for taking on sleepovers and on Cubs camp as it fits snugly into her sleeping bag as an aextra layer.

Oh, this is really fun! I have an adult daughter who is a real Disneyphile and loves the Little Mermaid and I think I'll make this for her. She'd get a real kick out of it!

The Little Mermaid was one of my favourite books as a child so I can understand your desire to create this. What colours will you choose for her? How many others love these mermaid tails and plan to make one for Christmas?


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