Professional Yarn Weight Converter
Convert WPI (Wraps Per Inch) to standard yarn weights with precision
How to Use WPI Converter
Drag the slider to select your yarn's WPI (Wraps Per Inch) measurement. WPI is determined by wrapping your yarn around a ruler for one inch and counting the wraps. The converter will show you the equivalent yarn weight category, recommended needle sizes, and best uses for your yarn.
Yarn Weight Analysis
Yarn Weight
Sport
Lightweight sweaters
WPI Range
12-14
Wraps per inch
Needle Size
3.25 – 3.75 mm
Recommended range
Best Used For
Lightweight sweaters
Common applications
Complete WPI Conversion Chart
| Yarn Weight | WPI Range | Needle Size (mm) | Common Use |
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