For these calculators, find the yarn label’s package weight and length. A label such as 100 g / 200 m describes one package’s mass and length. It does not mean that every 100 g skein contains 200 m.
Three numbers that mean different things
| Label information | What it tells you |
|---|---|
| 100 g | Nominal yarn mass in the package |
| 200 m | Nominal yarn length in that package |
| A thickness category such as Medium | A classification, not a package size or fixed length |
The Craft Yarn Council’s yarn weight system describes thickness categories and guideline gauge ranges. Use the package’s own mass and length for conversions.
Compare length before counting balls
A project requiring 1,200 m needs six packages of 200 m, or eight packages of 150 m, before any additional allowance. A different ball count does not necessarily mean a different total length. Round up to whole packages after calculating the requirement.
Matching length is only a quantity comparison. It does not establish that a replacement yarn will behave the same way, produce the same fabric, or meet the pattern’s gauge. Make and measure an appropriate swatch rather than relying on the package count.
Keep the label with leftovers
Record the mass and length before removing the band. Later, a net remainder of 40 g from a 100 g / 200 m package estimates to 80 m. The remaining-yarn calculator does this conversion. If the pattern uses yards, the tool also shows that equivalent.
Use the calculator ↗Examples illustrate the arithmetic; they are not physical project tests. Send a correction.