Crochet thread sizes play a crucial role in determining the appearance, texture, and durability of your crochet projects. Unlike yarn, which is categorized by weight (such as worsted or bulky), crochet thread is classified by size numbers—the higher the number, the finer the thread.
If you’ve ever wondered which crochet thread size to use for doilies, lace, jewelry, or home décor, this guide will help you choose the perfect thread for your project!
Understanding Crochet Thread Sizes
Crochet thread sizes are measured opposite to yarn weight—meaning that:
✔️ Smaller number = Thicker thread (e.g., Size 3 is thicker than Size 10)
✔️ Larger number = Thinner thread (e.g., Size 20 is finer than Size 10)
Thread sizes range from Size 3 (thickest) to Size 100+ (ultra-fine lace thread).
💡 Tip: If you’re new to crochet thread, start with Size 3 or 5 before working with finer threads like Size 10 or 20.
Crochet Thread Size Chart
Here’s a breakdown of the most common crochet thread sizes and their recommended uses:
| Thread Size | Best For | Recommended Hook Size (Steel) |
|---|---|---|
| Size 3 | Home décor, table runners, clothing, bags | 2.10mm – 2.75mm |
| Size 5 | Accessories, placemats, sturdy lace projects | 1.75mm – 2.25mm |
| Size 10 | Doilies, filet crochet, lace patterns | 1.25mm – 1.75mm |
| Size 20 | Delicate lace, fine details, heirloom crochet | 0.90mm – 1.25mm |
| Size 30 | Miniature lacework, jewelry, fine edging | 0.75mm – 1.00mm |
| Size 40+ | Ultra-fine lace, tatting, intricate designs | 0.60mm – 0.75mm |
💡 Tip: Use cotton crochet thread for crisp, defined stitches, especially in lace projects.
How to Choose the Right Crochet Thread Size
The thread size you choose depends on the type of project you’re making. Here’s a quick guide:
🔹 Size 3 and 5 – Best for Home Décor & Wearables
- Thick and easy to work with
- Great for placemats, rugs, bags, and lightweight clothing
- Perfect for beginners transitioning from yarn to thread crochet
✔ Recommended Projects: Table runners, sturdy lace pieces, summer tops, purses
🔹 Size 10 – Best for Doilies & Filet Crochet
- The most popular size for thread crochet
- Great for doilies, lace edgings, and vintage-style pieces
- Creates intricate, yet visible patterns
✔ Recommended Projects: Filet crochet (creating patterns with open/filled stitches), doilies, decorative motifs
🔹 Size 20 and 30 – Best for Delicate Lacework
- Finer than Size 10, perfect for detailed designs
- Used in heirloom crochet, lace shawls, and fine home décor
- Requires more patience and skill due to the small stitches
✔ Recommended Projects: Victorian-style lace, wedding accessories, handkerchief edging
🔹 Size 40 and Above – Best for Advanced Lacework
- Ultra-fine, used for tatting, micro-crochet, and intricate lace designs
- Not beginner-friendly but ideal for lace enthusiasts
- Works best with tiny steel hooks
✔ Recommended Projects: Miniature lace, fine jewelry, delicate tablecloths
💡 Tip: If you’re working with very fine thread (Size 40+), use magnifying glasses or bright lighting to avoid eye strain!
What Hook Size Should I Use for Crochet Thread?
Crochet thread requires steel crochet hooks, which are smaller than regular hooks. Here’s a guide to match hook sizes with thread sizes:
| Thread Size | Recommended Hook Size (Steel) |
|---|---|
| Size 3 | 2.10mm – 2.75mm |
| Size 5 | 1.75mm – 2.25mm |
| Size 10 | 1.25mm – 1.75mm |
| Size 20 | 0.90mm – 1.25mm |
| Size 30 | 0.75mm – 1.00mm |
| Size 40+ | 0.60mm – 0.75mm |
💡 Tip: A smaller hook creates tighter stitches, which is essential for delicate lace patterns.
Tips for Working with Crochet Thread
✅ Start with a larger thread size (Size 3 or 5) before progressing to finer threads.
✅ Use a comfortable grip—small hooks can cause hand fatigue.
✅ Keep an even tension—tight stitches can make fine threads difficult to work with.
✅ Work in bright lighting—small stitches can be hard to see.
✅ Block your finished project—this enhances lace designs and helps maintain shape.
💡 Tip: If your crochet thread twists or tangles, let the ball hang freely to untwist naturally.
Frequently Asked Questions (FAQ)
Q: Can I substitute yarn for crochet thread?
A: Not always! Yarn is thicker and stretchier, while thread is smooth and fine—substituting will change the look and texture of your project.
Q: Which crochet thread size is best for beginners?
A: Size 3 or 5 is the easiest to start with. They’re thicker and easier to see than finer threads.
Q: How do I keep my crochet thread from tangling?
A: Store it in a thread holder or zippered bag with a small hole to feed the thread smoothly.
Q: What is the most common crochet thread size?
A: Size 10 is the most widely used for doilies, lace projects, and home décor.
Q: Can I use regular crochet hooks with thread?
A: No, you need steel hooks, which are smaller and designed for fine thread.
Final Thoughts
Crochet thread comes in various sizes, each serving a unique purpose. Whether you’re making lace doilies, intricate jewelry, or filet crochet designs, understanding thread sizes will help you choose the best one for your project.
For beginners, start with Size 3 or 5. If you love fine lacework, experiment with Size 10 or smaller for delicate results!
Would you like a beginner-friendly crochet thread pattern to try? Let me know! 😊🧶