Crocheting a half double crochet blanket block is a great way to create a customizable, cozy project. This Half Double Crochet (HDC) blanket block is simple yet effective, making it a perfect addition to any crochet blanket. In this guide, we’ll go over the materials you need, step-by-step instructions, and helpful tips to ensure your block turns out beautifully.
How to Do a Half Double Crochet (HDC) Stitch
The half double crochet (HDC) stitch is a versatile and slightly taller stitch than a single crochet, but shorter than a double crochet. It creates a soft yet firm texture, making it perfect for blankets, scarves, and other cozy projects.
Step-by-Step Instructions
- Start with a Foundation Chain:
- Begin by chaining the number of stitches required for your project.
- Yarn Over (YO):
- Wrap the yarn over your hook before inserting it into the stitch.
- Insert Hook:
- Insert your hook into the next stitch (or the third chain from the hook if working from a foundation chain).
- Yarn Over and Pull Through:
- Wrap the yarn over your hook again and pull it through the stitch. You should now have three loops on your hook.
- Yarn Over and Pull Through All Loops:
- Wrap the yarn over again and pull through all three loops on your hook. You have now completed one half double crochet stitch!
- Repeat:
- Continue repeating steps 2-5 for each stitch across the row.
- Turning for the Next Row:
- At the end of the row, chain two (this acts as the first HDC of the next row) and turn your work.
Tips for Perfect Half Double Crochet Stitches
- Maintain Even Tension: Keep your yarn tension consistent for uniform stitches.
- Count Your Stitches: Always count your stitches to ensure you don’t accidentally increase or decrease the number.
- Practice with Swatches: If you’re new to HDC, practice making small swatches before starting a full project.
- Learn how to fix mistakes here: Crochet: Troubleshooting Beginner Mistakes

Materials and Tools for Half Double Crochet Blanket Block
To complete this half double crochet blanket block, you will need the following materials:
- Yarn: Worsted Weight #4
- Suggestions:
- Premier Just Yarn (Ruby)
- I Love This Yarn (Navy, White)
- Main Stays (White)
- Suggestions:
- Hook Size: 5.5mm
- Additional Tools:
- Stitch Marker
- Yarn Needle
- Row Counter
- Measuring Tape
- Yarn Snips or Scissors
These tools will help you create a neat and even block, ensuring consistency across all pieces of your blanket.

Step-by-Step Instructions For Half Double Crochet Blanket Block
Foundation: Chain 25.
- Row 1: Start in the 3rd chain from the hook (the initial chain 2 counts as the first HDC). Work 23 HDC stitches, chain 2, and turn. (Total stitches: 24)
- Rows 2-13: Work 24 single crochet (SC) stitches in each row, chaining 1 and turning after each row. (Total stitches: 24 per row)
- Measure Your Block: By the end of Row 2, your block should be approximately 6 inches wide. If it’s too small, restart with an additional stitch; if it’s too wide, reduce the number of stitches. A ¼-inch variance is acceptable.
- Edging: At the end of your final row, chain 1 and single crochet evenly down the side of the block (aim for about 26 SC stitches). In the last stitch, SC 3 into the corner and turn.
- Bottom Edge: Continue to SC across the bottom of the block, placing 3 SC stitches in the opposite corner before turning.
- Side and Final Edge: SC evenly along the remaining side (again, aim for approximately 26 stitches). SC 2 in the final corner and stop.
- Final Measurement: Your half double crochet blanket block should now measure about 7 inches. If needed, SC around all four sides once more to reach the correct size.
- Finish Off: Use a yarn needle to weave in the tail.
Helpful Tips for Success
- Consistent Tension: Make sure your stitches are even to maintain uniformity across all blocks.
- Measuring Accuracy: Measuring after Row 2 ensures you are on track with sizing early on.
- Hook Size Adjustment: If crocheting along the edges feels too tight, consider switching to a smaller hook (4mm or 4.5mm) but stay consistent for all blocks.
- Row Counting: A row counter can help keep track of your progress and ensure accuracy.
Why This Block is Great for Crochet Blankets
This half double crochet blanket block provides a sturdy yet soft texture, making it ideal for blankets. The combination of HDC and SC stitches ensures durability while maintaining a comfortable feel. Additionally, using multiple colors allows you to create a visually appealing design that enhances the final look of your project.
Want instructions on how to make a block crochet blanket? Read Step-by-Step: Making A Crochet Blanket With Blocks. Also read How to Crochet a Perfect Block with Single Crochet

Conclusion
The half double crochet blanket block is an excellent project for beginners and experienced crocheters alike. Its simple construction and clean edges make it a must-have for any blanket design. By following the step-by-step guide and incorporating helpful tips, you’ll achieve a perfectly sized and beautifully finished crochet block every time.
Happy crocheting!