Swap the yarn, keep the count right.
Tell Skeinote what your pattern calls for and the yarn you would rather use. It works out how many skeins to buy from the makers’ own labels, shows its arithmetic, and says plainly when a figure is not published.
Every figure links to the maker’s page with the date we read it. Skeinote never guesses, and it never calls two yarns a match. Read how it works.

Pick both yarns and the pattern quantity.
You will get the total length the pattern needs, the skeins of the new yarn that cover it, and both makers’ printed figures side by side, with a link to each label.
Before you substitute
Short guides on the parts the calculator cannot decide for you.

Same weight category, different fabric
Two yarns printed "worsted" can knit up nothing alike. What the category actually promises, what it leaves out, and how a swatch settles it.

Reading a yarn label, and why some makers print no weight number
Yardage, grams, fiber, and the category symbol: what each one is for, and what to do when one is missing from the maker's page.

From skeins to yards and back
How to turn a pattern's skein count into a total length, and a total length into skeins of something else, with the rounding shown.
How Skeinote decides what to publish
A yarn enters the catalogue only when the maker’s own page prints its yardage and skein weight. We copy the figures exactly, keep the maker’s wording for the weight, record the date, and re-check when a page changes. Missing figures stay missing. Read the full method.