This is a free crochet pattern and video tutorial showing how to crochet a Basic C2C Afghan Square in Half Double Crochet Boxes with 12 sizes included.
Find the free crochet pattern instructions below, or purchase a printer-friendly, ad-free PDF on Ravelry by clicking here.

Even though it’s Summer time, I have got Fall on my mind. My plan is to work up a throw pillow made with corner to corner (C2C) boxes worked in half double crochet, and appliqued with falling leaves – I will use my Basic Leaf 2 Ways crochet pattern.

I’ll look similar to my Fall Inspired Lightweight C2C Scarf, but in throw pillow form.

And hopefully will be a good pair to my Fall Vibes Square that I’m hoping to turn into a throw pillow soon too.
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My sweet Shiloh loves to photobomb, and I love it when he does!

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What Supplies Do I Need to Crochet a C2C Afghan Square?
- 15 (40, 68, 110, 170, 240, 310, 415, 520, 640, 770, 945) Yards of Worsted Weight Yarn – I used Red Heart Super Saver in the Buff colorway
- I9/5.5mm Crochet Hook
- Tapestry Needle
- Soft Tape Measure (if gauge is essential for your project)
Material Notes:
Similar Yarns: Caron’s One Pound, Bernat’s Super Value.
Depending on your project, you can use any yarn in your stash with respective crochet hook, and just work the square to your desired size. I will be using my 16″ square to create a throw pillow, and I like Red Heart’s Super Saver for my home projects because it’s durable, and machine washes well.
The yardage has been tested with the 16″ size, and the rest are estimated based on this.
Measurements:
I’ve got instructions to make squares that are around these sizes: 4″, 6″, 8″, 10″, 12″, 14″, 16″, 18″, 20″, 22″, 24″, and 27″.
The actual finished sizes with border are listed below:
- 4″: 4.13″ (4 1/8″) by 3.63″ (3 5/8″)
- 6″: 6.13″ (6 1/8″) by 6″
- 8″: 8″ by 7.63″ (7 5/8″)
- 10″: 10.13″ (10 1/8″) by 9.88″ (9 7/8″)
- 12″: 12.38″ (12 3/8″) by 12.13″ (12 1/8″)
- 14″: 14.13″ (14 1/8″) by 13.63″ (13 5/8″)
- 16″: 16″ by 15.75″ (15 3/4″)
- 18″: 18.38″ (18 3/8″) by 18.25″ (18 1/4″)
- 20″: 20.38″ (20 3/8″) by 20.25″ (20 1/4″)
- 22″: 22.38″ (22 3/8″) by 21.75″ (21 3/4″)
- 24″: 24.38″ (24 3/8″) by 24.25″ (24 1/4″)
- 27″: 26.88″ (26 7/8″) by 26.75″ (26 3/4″)
Gauge:
6 Squares = 4.13″ (4 1/8″) Wide by 3.63″ (3 5/8″) Tall

Abbreviations (US Terms):
- HDC – Half Double Crochet (Photo Tutorial)
- SC – Single Crochet (Photo Tutorial)

Pattern Notes:
Square grows from the bottom corner upward diagonally.
Beginning chain 1 in the boxes and the skipped stitches from the chain 5 does count as a stitch. In the border, the chain 1, does not count as a stitch.
A box is comprised of four half double crochet’s.
The “space under the same chain joined to” is defined as the space between the last two half double crochets of the previous rows box.
Working the final half double crochet into the top of the chain from the previous row helps to keep the edge more even. After completing the first box, you may also need to lightly tug on it to keep it even as well.
Instructions for smallest size – 4″ shown with 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 and 27 in parenthesis.
There are a lot of words and numbers to this pattern, and that can seem intimidating or daunting, but basically, you are going to build your square one row at a time increasing until you get the size you’re looking for, then decreasing back down to one box. The border will add 0.5″ to the finished size, so keep that in consideration while increasing.
As you work your square, the row you stop increasing on will measure 0.5” larger then the finished measurement. It’s safe to say this will be the finished size after the border is added, and the fabric “rests”. If after you finish the first round of the border, your square is not measuring large enough, you can add another round to the border working one stitch per single crochet and per chain space all the way around increasing in the corners.
Basic HDC C2C Afghan Square Video Tutorial:
Basic HDC C2C Afghan Square Written Tutorial:
Chain 5. HDC into the 3rd chain, and into each of the next 2. (1 Box)
Row 2: Chain 5, and turn. HDC into the 3rd chain, and into each of the next 2, slip stitch into the top corner stitch of the next box. Chain 1, work 2 HDC into the space under the same chain joined to, HDC into the top of the last stitch. (2 Boxes)
Row 3: (I) Chain 5, and turn. HDC into the 3rd chain, and into each of the next 2, slip stitch into the top corner stitch of the next box;
(II) Chain 1, work 3 HDC into the space under the same chain joined to, skip the next 3 HDCs, slip stitch into the top corner stitch of the next box;
(III) Chain 1, work 2 HDC into the space under the same chain joined to, HDC into the top of the last stitch. (3 Boxes)
Rows 4 – 6 (10, 13, 17, 21, 25, 28, 33, 37, 41, 45, 50): Using Row 3 as a base, you will continue working in the same manner repeating (II) one extra time each row to increase the number of boxes by one each row. At the end, you will have the same number of boxes as rows.
Row 7 (11, 14, 18, 22, 26, 29, 34, 38, 42, 46, 51): Turn. Slip stitch into the 2nd stitch, and each of the next 2. Chain 1, work 3 HDC into the space under the same chain joined to, skip the next 3 HDCs, slip stitch into the top corner stitch of the next box;
(IV) (chain 1, work 3 HDC into the space under the same chain joined to, skip the next 3 HDCs, slip stitch into the top corner stitch of the next box) 4x (8x, 11x, 15x, 19x, 23x, 26x, 31x, 35x, 39x, 43x, 48x);
Chain 1, work 2 HDC into the space under the same chain joined to, skip the next 3 HDCs, slip stitch into the top of the last stitch. [5 (9, 12, 16, 20, 24, 27, 32, 36, 40, 44, 49) Boxes]
Work Until You Have 3 Boxes Left: Using the previous row as a base, you will continue working in the same manner repeating (IV) one less time each row to decrease the number of boxes by one each row. Continue working until you have 3 boxes left.
2 Boxes: Turn. Slip stitch into the 2nd stitch, and each of the next 2. Chain 1, work 3 HDC into the space under the same chain joined to, skip the next 3 HDCs, slip stitch into the top corner stitch of the next box, chain 1, work 2 HDC into the space under the same chain joined to, skip the next 3 HDCs, slip stitch into the top of the last stitch. (2 Boxes)
1 Box: Turn. Slip stitch into the 2nd stitch, and each of the next 2. Chain 1, work 3 HDC into the space under the same chain joined to. Skip the next 3 HDCs, slip stitch into the top of the last stitch. (1 Box)
Border: Chain 1. SC into the space just under the same chain joined to, [chain 1, (SC into the next space in between boxes, chain 1) across to the corner, (SC, chain 2, SC) into the corner] 4x, chain 1, slip stitch join to the 1st SC.
Fasten off, and weave in ends.

Please feel free to make and sell your own projects made using an afghan square worked from this pattern, but please DO NOT claim this pattern as your own nor should you sell my pattern, and DO NOT re-publish my photos as your own. DO NOT copy and paste my pattern anywhere, link to it instead.

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Beautiful pattern!
Michelle
https://mybijoulifeonline.com
Thank you! I just love the texture of this stitch pattern.