Blanket Granny Square Blanket | Free Crochet Pattern Updated February 11, 2026 This post contains affiliate links. If you make a purchase through links on our site, I may earn a small commission. Click to see full details of my Privacy Policy. Pin it now, make later!505Shares Introducing the Mermaid Shells Blanket. This giant granny square baby blanket is quick and easy to make and the colour combination is just stunning. I’ve finished this blanket with a shell style border to give those sea side mermaid vibes.TABLE OF CONTENTS1. Table of contents2. Granny Square Blankets3. How many Granny Squares do I need for a blanket?4. What makes the perfect Granny Square?5. Materials & Tools6. Colour Combinations 7. Pattern Notes8. Sizing9. Gauge Swatch 10. Gauge11. Convert Pattern Terms12. Crochet Terms & Abbreviations13. Pin For Later14. Fast & Easy Blanket Patterns15. Pattern Support16. Video Tutorial17. Ways to get this pattern18. Mermaid Shells Blanket: FREE Pattern19. BorderVIEW MORE▼ Granny squares are iconic and never seem to go out of fashion and it’s easy to see why. These versatile squares can be adapted to suit your own colour preferences and are quick and easy to work up. Personally, I’ve made countless granny square blankets and just can’t get enough of them. Table of contentsGranny Square BlanketsHow many Granny Squares do I need for a blanket?What makes the perfect Granny Square?Materials & ToolsColour CombinationsPattern NotesSizingGauge SwatchGaugeCrochet Terms & AbbreviationsPin For LaterFast & Easy Blanket PatternsVideo TutorialWays to get this patternMermaid Shells Blanket: FREE Pattern Granny Square Blankets There are endless possibilities when it comes to granny square blankets. You can take a basic granny square pattern and make changes to colour ways, amount of rounds and layouts and create something unique each time. They’re one of my favourite things to crochet. How many Granny Squares do I need for a blanket? Well, for this blanket…JUST ONE! We’re going to be making a giant crochet granny square (Also known as an infinity granny square). This makes this pattern so easily adaptable because you can keep adding your rounds to make your blanket as big or small you like! What makes the perfect Granny Square? Honestly, what makes the perfect granny square is really down to personal preference. In my basic granny square tutorial created for complete beginners, I chain 3 in the corners and chain 1 between granny sets. I find this a great way of helping beginners understand the concepts of a granny square. In this pattern however, I have only chained 2 in the corners and didn’t chain at all between granny sets. I wanted to created a tighter looking square so this worked perfectly for me. I highly recommend experimenting with this and seeing what you preference is. Materials & Tools Yarn: Caron Simply Soft in: Colour A: Off White Colour B: Robins Egg Colour C: Orchid Colour D: Watermelon Colour E: Soft Green Crochet Hook: 5mm (US H-8) Darning needle/Tapestry needle Scissors Colour Combinations I’ve chosen to use pastels with a pop of colour for my Mermaid Shells Blanket which I think looks stunning, but here’s a few more colour ways to give you some inspiration. Pattern Notes Written in UK terms but switchable to US terms below. When you work three trebles (US Doubles) into one space, it will be referred to as a granny set. The beginning magic ring can be replaced with a chain 4 and join in first chain with a slip stitch if preferred. Sizing Completed size: This baby blanket measures 68.5cm (27inch) Square. Gauge Swatch Crochet gauge (Also know as tension swatch) is important because it ensures that your finished projects have the correct size, fit, appearance, and use of materials as intended by the pattern designer. Ignoring gauge can lead to the project not coming out to the intended size. I highly recommend making a gauge swatch to ensure you are not disappointed with the finished item. If you’re struggling to hit gauge, you may find the following video helpful. In this video, I explain how to adjust the amount of stitches in your own and also demonstrate how to adjust the height of your stitches using the golden loop. This is a great way to get to know your own personal tension and I’d highly recommend watching this video tutorial. Gauge Your square should measure 10cm X 10cm (4inch X 4inch) after 4 rounds. Convert Pattern Terms Here you can quickly switch between UK and US crochet terms. This will make following the pattern easier as all terms will be converted to your preferred version. view in UK terms view in US terms Crochet Terms & Abbreviations Chain Stitch (ch): Insert hook, yarn over, pull though loop on the hook. Slip Stitch (sl st): Insert hook through stitch, yarn over, pull through chain and loop on the hook. Double Crochet(s): dc(s): Insert hook into stitch, yarn over, pull up a loop, you will have two loops on the hook. Yarn over, pull through remaining two loops. Treble Crochet(s): tr(s): Yarn over, insert into chain space, yarn over, pull through, you will have three loops on the hook. Yarn over, pull through two loops, yarn over, pull through remaining two loops. How to Crochet – A Handy Reference Guide eBook Unsure of the differences between UK and US terms? Need a refresher on how to do your stitches? In my ‘How to crochet: A handy reference guide’ EBook I help you with all of these terms and you can always have them to hand! You will also get exclusive access to free video instructions. Learn more about the eBook here. Pin For Later Fast & Easy Blanket Patterns Do you love crocheting fast and easy blankets? Check out these patterns available on the blog: Moss Blanket Switch it Up/Fast & Easy Blanket By the Sea Blanket Moss Blanket Switch it Up/Fast & Easy Blanket By The Sea Blanket Pattern Support The fastest way to get pattern support is to ask in our dedicated facebook group for Bella Coco Crochet patterns. This is the best place for you to connect with other crocheters. Please note, if you wish to change and adapt this pattern in any way, this must be done at your own exploration and we cannot offer assistance with this. Video Tutorial The video for this pattern explains how to work the first 4 rounds of this project as well as how to change colours in your work. The video also shows you how to add the boarder to complete the blanket. Remember the video uses UK terms, but we do make reference to the US terms to help you out if needed. If you are confident in making granny squares, I’d highly recommend watching my video on the no sew granny square. Ways to get this pattern This pattern is available here for FREE on the blog. Simply sign in to your Grow account to get access to the pattern. You can upgrade the beautiful Ad-Free PDF with all of the information for this pattern plus step-by-step photos, a chart and a left-handed resource via my Etsy shop, Ravelry and Bellacococrochet.com This beautiful PDF pattern includes additional information such as yarn substitutions, charts and step by step photos for completing each stage of the project. etsy Bella coco crochet ravelry Remember, if you are part of The Crochet Community, you get this pattern as part of your membership! Mermaid Shells Blanket: FREE Pattern Foundation: With Colour A, make a magic ring. You are viewing this pattern in UK terms. Round 1: 3 ch (counts as tr here and throughout), into ring work 2tr, ch2, *3tr, ch 2; rep from * twice more. Join with ss into top of ch-2. Fasten off, close magic ring and turn. <12 tr, 4 ch-2> Join Colour B in any ch-2 sp. Round 2: 3 ch, (2tr, ch2, 3 tr) into ch-2 sp. *(3 tr, ch 2, 3 tr) in next ch-2 sp; rep from * twice more. Join with ss into top of ch-2. Fasten off and turn. <24 tr, 4 ch-2> Join Colour C in any ch-2 sp. You are viewing this pattern in UK terms. Round 3: 3 ch, (2 tr, ch 2, 3 tr) into ch-2 sp. *Miss 3 sts, 3 tr in sp between granny sets, miss 3 sts, (3tr, ch2, 3 tr) in ch-2 sp; rep from * twice more. Miss 3 sts, 3 tr in sp between granny sets. Join with ss into top of ch-3. Fasten off and turn. <36 tr, 4 ch-2> Join Colour D in any ch-2 sp. Round 4: 3ch, (2tr, ch2, 3 tr) into ch-2 sp. Miss 3 sts, * (3 tr in sp between granny sets, miss 3 sts) to corner ch-2sp, (3tr, ch2, 3tr) in next ch-2 sp, miss 3 sts; rep from * twice more. (3 tr in sp between granny sets, miss 3 sts) to last ch-sp. Join with ss into top of 3-ch. Fasten off and turn. <8 tr, 4 ch-2> Join Colour E in any ch-2 sp. Round 5: Repeat round 4. From this point forward you will be repeating the colour sequence: A, B, C, D, E. Round 6-29: Repeat round 4 ending your last round on colour D without fastening off. Do not turn. Border You are viewing this pattern in UK terms. Ss across to the next tr so you are starting in the centre tr on the first corner granny set. Ch-3, work 3 tr in same st, miss a st, ss in ch-2 sp. *Miss next st, 4 tr in next st, miss a st, ss in sp between granny set or ch-2 sp; rep from * around. Ss in top of ch-3. Fasten off. Sew in all ends. I always love to see your makes so if you try any of my patterns or follow my stitch tutorials please tag me @bellacococrochet or use the #bellacococrochet sarah-jayne KEEP ON making Don’t miss a thing! Sign up to our newsletter, grab a cuppa and find out about the latest posts and projects. First name Email address Thanks! Please check your inbox (and junk) to confirm your subscription! Pin it now, make later!505Shares Further Reading... How to Crochet a Spring Abstract Blanket: Free Pattern July 10, 2019 How to Crochet a Filet Blanket: Free Pattern July 9, 2025 The Best Crochet Stitches for Blankets July 15, 2025 1 Comment Katie H September 14, 2024 at 6:17 pm Although I am not a beginner, I do think this would be a brilliant first project for a beginner. This is easy to make and the first time I have turned my granny squares. Had the urge to make a granny square this afternoon. I think I needed to have a break from my more complex projects and I absolutely loved making this with my left over yarn! Thanks SJ. X Reply Leave a Reply Cancel Reply Save my name, email, and website in this browser for the next time I comment.
