Granny Squares are the OG - the “original gangsters” in the crochet world. Grandma’s classic crochet pattern is very much trending in 2025 as it became a revolution in the 1970s and will continue to slay for a long time! They are small, stylish, and endlessly customizable. And, all you need is a crochet hook and yarn. You do not even need a full yarn skein; leftover yarn from your stash will also do. One minute you’re making one and next thing you know, you’ve got a blanket, a bag, a top, or home decor. Granny squares are the beloved building blocks of countless crochet projects. To get started, explore our guide on how to crochet a classic granny square.
While you can make a granny square in any size as the rule goes crochet hook size + matching yarn weight. However, you can always explore creativity by asking the question, What size crochet hooks to use for Granny Squares. The right hook size depends on various factors, including everything from the drape and texture of your finished piece to how quickly you can complete it. In this blog, let’s walk you through how to choose the perfect crochet hook size for your granny square.
Understanding Crochet Hook Sizes and Using Them for Granny Squares
Crochet hooks come in a variety of sizes, typically measured using either the metric system (in millimeters) or letter/number designations in the US system. Single-ended crochet hooks are tools for regular crochet, however, you can work on the granny square with double-ended crochet hooks as well as interchangeable Tunisian crochet hooks, but without attaching the cable. The general rule is that larger hooks create looser, more open stitches, while smaller hooks produce tighter, more dense fabric. Before you dive into details, explore our guide on everything you need to know about crochet hook sizes.
Crochet Hooks and Matching Yarn Weight for Granny Squares
Selecting your crochet hook size generally falls to the weight of your yarn.
Here's a general guide for pairing yarn weights with hook sizes for granny squares:
| Yarn Weight |
Crochet Hook Size (mm / US) |
Granny Square Characteristics |
|---|---|---|
|
Lace Weight (0) |
1.5–2.25 mm (US 8–B-1) |
Intricate stitches, ideal for fine granny squares that make shawls or decorative pieces. |
|
Fingering/Sock (1) & (2) |
2.25–3.25 mm (US B-1 to D-3) |
detailed stitches, ideal for lightweight garments, summer tops and cowls. |
|
DK (3) |
3.75–4.5 mm (US F-5 to 7) |
Balances detail and speed, a versatile favorite. Ideal for a range of projects from garments to home decor and gifts. |
|
Worsted/Medium (4) |
5.0–6.0 mm (US H-8 to J-10) |
Works up quickly with good stitch definition. Perfect for winter garments, afghans/ blankets and home decor. |
|
Bulky (5) & Super Bulky (6) |
6.5–8.0 mm (US K-10.5 to L-11) |
Ideal for winter accessories and cozy throws. Excellent for beginners or last-minute gifts. |
Making Your Crochet Hook Choice
While yarn weight provides a starting point, consider these additional factors when selecting the crochet hook size for granny squares:
1. Crochet Tension
If you tend to crochet tightly, you might want to size up from the recommended hook that is mentioned on the yarn label. Conversely, if your stitches are typically loose, sizing down might give you better results.
2. Project Purpose
Consider how you'll use your granny squares:
- For blankets: Choose a slightly larger hook for softer drape and comfort.
- For bags: A smaller hook creates sturdier fabric with less stretch
- For garments: Hook size affects how the finished piece hangs on the body.
3. Desired Effect
How you want your granny square to look is a deciding factor in the crochet hook size.
- For open, lacy granny squares: Choose a hook 1-2 sizes larger than recommended
- For dense, solid squares: Use a hook 0.5-1 size smaller than recommended
- For traditional, balanced squares: Stick close to the yarn's recommended hook size
4. Testing & Experimenting
Before starting a large project, it's always wise to make a test square. Create a simple granny square using your chosen yarn and hook size, then evaluate:
- Is the square too tight or too loose?
- Do you like the overall look and feel?
- Are your stitches neat and even?
- Does the square block to your desired dimensions?
If you're not satisfied with your test square, adjust your hook size accordingly and try again.
Don't be afraid to experiment with using different hook sizes within the same project:
- Use a smaller hook for the starting chain and first round to create a tighter center
- Switch to a larger hook for the outer rounds to create a ruffled effect
- Alternate hook sizes for decorative textured bands within your squares
There's no single "correct" hook size for granny squares. The perfect crochet hook is the one that helps you achieve your desired results. Don't hesitate to experiment with different sizes to discover what works best for your unique crochet journey.
Happy hooking!
