WPI means Wraps Per Inch: it’s a way of working out the thickness of your yarn if you don’t know what the ply is. Not all patterns will reference a WPI, but it’s good to know what it means just in case you come across one.
Above: Loopy Mango Merino No 5 in Rose Petal Pink.
How does it work? Grab a pencil or a ruler and wrap the yarn around it until you’ve covered about 5cm (2 inches), then count how many wraps you got in an inch. As an example our ‘Jersey Be Good’ yarn is estimated at 4 wraps per inch, while a much thinner 4 ply yarn (sometimes called fingering) would be 14 WPI.
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