Whether you fancy making some quick bunting or are planning on hooking up an angular patchwork blanket, understanding how to crochet a triangle is a fun introduction to the world of crochet geometry.
If you’re new to crochet, you may find our post on how to increase in crochet stitches a useful companion to this post.
Crocheting triangles is actually surprisingly easy, as unlike many other shapes where you would need to work in the round, triangles can be made in rows with simple increase stitches. In this tutorial we’re going to focus on making an equilateral triangle (where all 3 angles are the same), as these are the easiest and perhaps most useful type of triangles.
Crochet triangles are generally made by doing an increase stitch (working two stitches into one stitch) at the end of alternate rows. It’s worth noting that if you try increasing stitches at both ends of your row, you’ll end up with a much wider triangular shape that will normally start curving the bottom edge – hence these are not commonly used.
So grab a hook and some yarn, and lets get started!
How to crochet a triangle
Row 1: Make a slipknot to attach your yarn to your hook, then ch2…
…then work 2dc into the second chain from your hook (this would be the first chain you made)
Row 2: Ch1 (does not count as a stitch), dc into your first stitch…
…then work 2dc into the next stitch. Turn.
Top Tip – you may get a little loop sticking out of the side from your first row of dc stitches – if this is the case, just pick up the loop when working into the last stitch of this row, this will help to bring it in and hide it.
Row 3: Ch1 (again does not count as stitch), work a dc in each stitch along up to the last stitch, then work 2dc into the last stitch. Turn. So in this example, row 3 would be: dc in next 2 sts, 2dc in next st – giving you 4dc.
Continue repeating row 3 for each further row. Your stitch count will increase by 1 for each row you work. Once your triangle is complete to your desired size, fasten off as usual.
And that’s how to crochet a triangle – simple isn’t it! If you’re wondering whether you could do this with decrease stitches instead, technically the answer is yes, but you would have to know the exact chain width that you want your final triangle to have.
It’s worth noting that although this is a simple technique when using dc stitches, it doesn’t quite come out the same if you use treble stitches, as these are taller stitches so you won’t get the same angles. If you want to make a triangle with treble stitches, it’s more common that you’ll do this by working in the round. So with that in mind, let’s take a look at how to crochet a granny square triangle!
How to crochet a granny square triangle
Start off with a ch4…
…then join in the first ch with a slip stitch to make a ring. (alternatively you could use the crochet magic loop technique)
Round 1: Ch6 (which counts as a tr and ch3)…
…then work 3tr into the ring, then ch3…
…repeat (3tr, ch3) once more into the ring…
[You will have made 3 x 3tr clusters and 3 x 3ch-spaces]
Round 2: Ss in the next 3ch-sp and ch3…
…work (2tr, ch3, 3tr, ch1) in same 3ch-sp as your first ss…
… then work (3tr, 3ch, 3tr, ch1) into the next 3ch-sp…
… and repeat (3tr, 3ch, 3tr, ch1) one more time into the last 3ch-sp…
…then finish the round with a ss to join in the top of your starting 3ch.
And that’s how you make a crochet granny triangle. Your corners may be a little bit rounded like in the image above, but blocking will help to define the triangular shape, and it will be a lot less noticeable if you join multiple granny triangles together.