It does. The size of your hook has a large effect on the size, drape and feel of your work. This guide explains hook sizes, shows a conversion chart, describes the main types of hooks and materials, and gives practical tips for choosing the right hook for your yarn and project.
Why Hook Size Matters
The hook determines the size of the loops you make, and therefore the size of every stitch.
- A larger hook makes bigger stitches, a looser, more flexible fabric, and a larger finished item.
- A smaller hook makes smaller stitches, a denser and firmer fabric, and a smaller finished item.
Using the wrong hook can make a hat too small, a blanket too stiff, or a toy with holes in its stuffing. That is why patterns suggest a hook size, and why you should check your gauge when size matters.
Hook Size Chart
Crochet hook sizes are shown in millimeters, which is the most reliable system, and often also with US letters or numbers. Labels vary a little between brands, so use this chart as a guide.
| Metric (mm) | US size |
|---|---|
| 2.25 | B-1 |
| 2.75 | C-2 |
| 3.25 | D-3 |
| 3.5 | E-4 |
| 3.75 | F-5 |
| 4.0 | G-6 |
| 4.5 | 7 |
| 5.0 | H-8 |
| 5.5 | I-9 |
| 6.0 | J-10 |
| 6.5 | K-10½ |
| 8.0 | L-11 |
| 9.0 | M/N-13 |
| 10.0 | N/P-15 |
Important notes:
- Go by millimeters. Letters and numbers are not perfectly consistent between brands, but the millimeter size is a true measurement of the shaft.
- Steel hooks use a different system. Very fine steel hooks used for thread crochet are numbered so that a higher number means a smaller hook. Check the millimeter size.
- Older UK sizes use numbers that are not the same as US sizes. Again, use millimeters when in doubt.
Matching Hook to Yarn
Yarn labels suggest a hook size. These are approximate hook ranges for common yarn weights, and they match those in our guide to the best yarn for crochet beginners.
- Lace and thread: 1.6 to 2.25 mm
- Super fine (fingering): 2.25 to 3.5 mm
- Fine (sport): 3.5 to 4.5 mm
- Light (DK): 4.5 to 5.5 mm
- Medium (worsted): 5.5 to 6.5 mm
- Bulky: 6.5 to 9 mm
- Super bulky: 9 mm and larger
These ranges are suggestions and not rules. Many crocheters use a smaller hook for firm projects, and a larger hook for soft, drapey ones.
Parts of a Hook
- Tip (point): The end that goes into the stitches. Pointed tips go in easily but can split yarn; rounded tips split yarn less but are harder to insert.
- Throat (or hook): The notch that catches the yarn. Deep throats hold yarn securely; shallow throats let it slide.
- Shaft: The part that determines the size of the stitch.
- Thumb rest: The flat area where your thumb and finger hold the hook.
- Handle: The rest of the hook. Some are thicker for comfort.
Hook Types and Materials
Tapered and Inline Hooks
Tapered hooks have a rounded, narrowing head. Inline hooks have a head that is the same width as the shaft and a sharper throat. Neither is better. Try both to see which feels right.
Aluminum
Smooth and slippery, with a wide range of sizes and colors. Good for most yarns, especially those that are not too slippery. A popular choice for beginners.
Steel
Used for fine thread and lace work, as it can be made very thin.
Plastic and Acrylic
Lightweight and inexpensive, and often used in larger sizes. They can flex or bend, so they may not suit very thick yarn.
Bamboo and Wood
Warm to the touch, with a slightly grippy surface that is good for slippery yarns. They can be less smooth than metal, so they may slow you down with sticky yarn.
Ergonomic Handles
Thicker handles in soft materials can reduce hand strain for some people. They are often more expensive but may be worth trying if your hands tire easily.
Choosing a Hook by Project
- Amigurumi, ornaments and coasters: A hook one or two sizes smaller than the label suggests for a tight fabric. This is the approach used in our crochet coasters and tree ornament patterns.
- Blankets and scarves: The recommended size, or a size larger for a softer drape.
- Hats and wearables: The size suggested by the pattern, and check gauge.
- Lace and thread work: A steel hook and a fine thread.
- Bags and baskets: A smaller hook for a firm, sturdy fabric.
How to Test Your Hook
- Make a swatch using your yarn and hook. Use our practice swatch pattern in the yarn guide.
- Squeeze and stretch the fabric. If it feels stiff, try a larger hook. If it feels loose or has gaps, try a smaller hook.
- Measure the swatch, and compare it with the pattern's gauge if there is one.
- Change the hook size until the fabric feels right.
Some people crochet loosely and some tightly, so you may need a different size from the one recommended. This is normal.
Comfort and Care
- Hold the hook comfortably. Relax your grip, and keep your wrists and shoulders loose.
- Take breaks. Stretch your hands and fingers regularly.
- Try different handles if your hand feels tired.
- If you feel pain, stop and rest. If it continues, speak with a health professional.
- Store hooks safely. A case or a cup keeps them organized and protects the tips.
- Check for damage. Small burrs or scratches on a metal hook can snag yarn. Replace damaged hooks.
Buying Tips
- Start with a few common sizes. A 3.5 mm, 4.0 mm, 5.0 mm and 5.5 mm hook cover a lot of beginner projects.
- Consider a set. Sets are good value, but buy single hooks if you only need one or two.
- Buy a hook gauge. A small hook sizer helps you check the size if the label has worn off.
- Try before you buy, if you can, to see how a hook feels in your hand.
- Avoid very cheap hooks with rough seams or sharp edges.
Common Mistakes and Fixes
The fabric is stiff. Use a larger hook, or relax your tension.
The fabric is loose or has holes. Use a smaller hook.
The yarn keeps splitting. Try a rounder tip, or a smoother yarn.
The yarn sticks or drags. Try a smoother metal hook.
The hook slips out of your hand. Try a hook with a thumb rest or a thicker handle.
The pattern's size does not match yours. Check your gauge, and change the hook size to match.
Frequently Asked Questions
What size hook should a beginner use?
A 5.0 to 5.5 mm hook with a smooth worsted-weight yarn is a common beginner combination, but follow the label on your yarn.
Is a bigger hook easier to use?
Larger hooks and thicker yarn can make the stitches easier to see, but very large hooks can feel awkward. A medium size is usually the most comfortable.
Can I use a different size hook from the pattern?
Yes, but your item may come out a different size. Always check your gauge for items that need to fit.
What is the difference between a US size and a metric size?
The metric size is the diameter of the shaft in millimeters. US sizes use letters and numbers that vary slightly between brands.
Do I need different hooks for different yarns?
You may, because thicker yarn needs a larger hook. Slippery yarns may work better with bamboo or wood, and sticky yarns may work better with smooth metal.
Why do some people use a smaller hook for toys?
A smaller hook creates tighter stitches, so that the stuffing does not show through.
Final Thoughts
The right hook helps you work comfortably and get the results you want. Start with a few common sizes, test them with your yarn, and trust your swatch and your hands. As you gain experience, you will learn which hooks and sizes suit your style. Once you know your hooks, you can read patterns more easily with our guide on how to read a crochet pattern. Happy crocheting!
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