Crochet Yarn Weight Converter

Convert crochet yarn weight with this free online tool

Crochet Yarn Weight Converter

Standard yarn weight categories with WPI, hook sizes, gauge, and ply equivalents

Select Yarn Weight Category

Category 4: Medium

Alternative Names

Worsted / Afghan / Aran

Wraps Per Inch (WPI)

16-20

Recommended Hook Size

5.5-6.5 mm (I-9 to K-10½)

Crochet Gauge

11-14 sc = 10 cm

Ply Equivalent

8-10 ply

Knitted Gauge (10 cm)

16-20 sts

All Yarn Weights at a Glance

#	Name	WPI	Hook Size	Ply
0	Lace	30-40+	1.0-1.75 mm (Steel)	1-2 ply
1	Super Fine	27-32	2.25-3.5 mm (B-1 to E-4)	3-4 ply
2	Fine	23-26	3.5-4.5 mm (E-4 to 7)	4-5 ply
3	Light	21-24	4.5-5.5 mm (7 to I-9)	6-8 ply
4	Medium	16-20	5.5-6.5 mm (I-9 to K-10½)	8-10 ply
5	Bulky	12-15	6.5-9.0 mm (K-10½ to M-13)	10-12 ply
6	Super Bulky	7-11	9.0-15.0 mm (M-13 to Q)	12+ ply
7	Jumbo	1-6	15.0+ mm (Q+)	N/A

The Crochet Yarn Weight Converter is a free tool that runs entirely in your browser. No sign-up, no downloads — just open and use it.

Key Features

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Instant crochet yarn weight converter conversions

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Supports multiple input formats

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Batch conversion capability

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Copy results with one click

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No installation needed

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100% free online converter

How to Use Crochet Yarn Weight Converter

Enter Your Data

Input your values or data into the crochet yarn weight converter tool fields

Configure Options

Adjust any optional settings or parameters for your specific needs

Get Instant Results

The tool automatically calculates and displays results in real-time

Copy or Export

Copy the results to clipboard or use them directly in your project

Repeat as Needed

Run the tool again with different inputs — unlimited usage, completely free

Use Cases

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Use crochet yarn weight converter for personal projects

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Professional and academic applications

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Quick reference and verification

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Everyday productivity and convenience

Frequently Asked Questions

Is the Crochet Yarn Weight Converter free to use?

Yes, the Crochet Yarn Weight Converter is completely free with no registration required. Use it as many times as you need.

Do I need to create an account?

No account needed. All tools work instantly in your browser without any signup or login.

Is my data safe?

Absolutely. All processing happens locally in your browser. Your data is never sent to any server.

Does the Crochet Yarn Weight Converter work on mobile?

Yes, the tool is fully responsive and works on phones, tablets, and desktop computers.

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