Yarn Weight Conversion
Convert wraps per inch (WPI) to yarn weight category and get recommended gauge range and needle size.
Inputs
Results
Detected Yarn Weight
DK
Gauge Range (min)20 sts/4in
Gauge Range (max)22 sts/4in
Needle Size (min)3.75 mm
Needle Size (max)4.5 mm
How to Use This Calculator
- Enter the weight of yarn you have available in grams.
- Input the yardage per skein (from the ball band) to determine yards per gram.
- Enter the yardage per gram of the substitute yarn.
- Review the converted skein count and total grams needed for the substitute.
- Purchase the substitute yarn in the calculated quantity, rounding up to whole skeins.
What each input means
- Wraps per Inch (WPI)
- Wrap the yarn around a ruler and count wraps per inch. This determines yarn weight.
- Yarn Weight Category
- Select manually or let WPI auto-detect the weight category.
How this is calculated
Worked example, using the default values
- Identify Input ParametersWraps per Inch (WPI) = 14, Yarn Weight Category = 5 = 2 input(s) provided
- Calculate Detected Yarn WeightDetected Yarn Weight = data.nameDK = DK
- Calculate Gauge RangeGauge Range = 3220 = 20
- Calculate Gauge RangeGauge Range = 4022 = 22
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