Fiber-to-Yarn Yield Calculator

Finished yarn yardage from raw fiber weight.

Raw fiber weight (oz)

Target WPI

Number of plies

Wash yield (%)

Prep loss (%)

Tab to move between fields

Estimated total yards

4,212

Yards per pound7,200

Spinnable fiber (oz)9.36

Clean weight (oz)10.4

Overall yield (%)58.5%

Waste fiber (oz)6.64

Finished yarn weight (oz)9.36

How to Use This Calculator

Enter the raw fiber weight in ounces (16 oz = 1 lb of raw fleece or fiber).
Enter the target WPI of the finished yarn.
Set the number of plies.
Enter the wash yield percentage — raw fleece is typically 50–70%; washed fiber is 90–95%.
Enter the prep loss percentage for carding, combing, or picking waste (typically 5–15%).
Read the total estimated yards and the spinnable fiber weight in ounces to know how much usable fiber you have.

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