Crochet Your Way to a Perfect Circle!
Crochet circles form the foundation of many functional projects, from simple coasters and pot holders to hats, bags, and circular shawls. While the mathematical principle behind a flat circle is straightforward, achieving a truly round shape requires careful placement of increases. Without a structured formula, circles can easily wave at the edges, cup inwards, or develop distinct corners that resemble hexagons rather than smooth curves.
When choosing yarn for circular projects, the drape and stitch definition of natural plant-based fibres are excellent for showing off clean geometric lines. Refer to our ultimate yarn weight guide to select the correct thickness for your project. If you are developing custom circular projects, you can use purlJam to generate custom patterns, or consult our essential craft glossary to familiarise yourself with standard stitch abbreviations.
Essential Mechanics of a Flat Circle
To keep a circular piece lying completely flat, you must follow three core rules:
- Consistent Stitch Math: Every stitch height requires a specific starting number of stitches, which also dictates the number of increases added to each subsequent round. For double crochet (dc) in UK terminology, starting with 6 stitches and adding 6 increases per round is standard.
- Even Tension: Consistent tension keeps your stitches uniform. Varying your tension mid-project will cause the circle to warp or ripple.
- Staggered Increases: If you place your increases directly on top of the increases from the previous round, the fabric will expand faster at those points, creating corners. Staggering the increases prevents this hexagonal shape and maintains a clean circular edge.
12-Round Flat Circle Pattern (UK Double Crochet)
The pattern below uses staggered increases to construct a flat circle with a smooth, round edge. You can use standard double crochet increases (two stitches worked into one) or the invisible increase (dcinc) for a completely seamless fabric.
Note: We recommend starting with a magic loop to ensure the centre of your circle can be pulled tightly closed, leaving no visible hole.
- Start with a magic loop and work 6 dc into the loop (or ch 2 and work 6 dc into the second ch from the hook). Place a stitch marker in the first stitch to mark the start of the round, shifting it up with each new round. (6 dc)
- Dcinc in each stitch around. (12 dc)
- [1 dc, dcinc] repeat 6 times. (18 dc)
- [2 dc, dcinc] repeat 6 times. (24 dc)
- 1 dc, dcinc, [3 dc, dcinc] 5 times, 2 dc. (30 dc)
- [dcinc, 4 dc] repeat 6 times. (36 dc)
- 2 dc, dcinc, [5 dc, dcinc] 5 times, 3 dc. (42 dc)
- 4 dc, dcinc, [6 dc, dcinc] 5 times, 2 dc. (48 dc)
- 6 dc, dcinc, [7 dc, dcinc] 5 times, 1 dc. (54 dc)
- 1 dc, dcinc, [8 dc, dcinc] 5 times, 7 dc. (60 dc)
- 3 dc, dcinc, [9 dc, dcinc] 5 times, 6 dc. (66 dc)
- 5 dc, dcinc, [10 dc, dcinc] 5 times, 5 dc. (72 dc)
Stitch Height and Structure
The height of the stitch you choose directly affects the shape and rate of expansion of your circle. Double crochet (dc) stitches are short and dense, which makes them more prone to showing polygon corners if increases are not staggered. Taller stitches, such as treble crochet (tr), have more flexibility in their structure and tend to drape more easily, requiring a starting round of 11–13 stitches to lie flat.
Frequently Asked Questions
Why is my crochet circle curling up like a bowl?
If the circle is cupping inwards, it means you are not adding enough increases per round to accommodate the growing circumference. Ensure you are increasing by the correct number of stitches (e.g. adding 6 stitches each round for double crochet) and checking that your stitch count matches the pattern at the end of every round.
Why is my crochet circle waving or rippling at the edges?
Rippling occurs when there are too many increases in a round, causing the outer edge to grow faster than the flat surface needs. To fix this, verify your stitch count, ensure you aren't accidentally working double increases, or try using a slightly smaller hook size to tighten your tension.
How do I choose the correct starting number of stitches for different stitch heights?
Stitch height determines the radius of each round, which dictates how many stitches you need to start with to lie flat. As a standard guide, start with 6–8 stitches for double crochet (dc), 8–10 stitches for half treble (htr), and 11–13 stitches for treble crochet (tr) in UK terminology.
What is the benefit of using the invisible increase (dcinc) in a circle?
A standard increase works two stitches into both loops of a single stitch below, which can create a noticeable gap or bulk. The invisible increase works the first stitch into the front loop only and the second into both loops, which fills the gap and results in a completely smooth fabric surface.