The common suggestion is to substitute two strands of sport weight for 1 strand of worsted weight.
However, everyone's tension is different. If your pattern has a gauge, I would suggest you crochet a small swatch and see if the gauge matches, using your tension. If it is too large, there are other variations you can try. 1 strand of fingering or sock yarn with 1 strand of sport or DK yarn, for example. Of course, that would necessitate having or buying more yarn.
Worsted weight describes the thickness of the yarn. It is commonly found in America and knits on 4.5mm needles (or thereabouts). It is slightly thicker than the dk yarn most commonly found in Britain which is knit on 4mm (or so) needles.
Craft Yarn Council of America has a chart listing the basic yarn weights.
Worsted Weight yarn will be designated as such on the yarn label as #4, medium weight. Keep in mind, however, that not all medium weight yarns are equal. If it is important that your item come out the same size as your pattern, it might be of benefit to make a gauge swatch.
In the UK, worsted weight yarn corresponds to 10ply (i.e. heavy DK or light aran yarn)
Worsted weight yarn would go great with plastic projects.
worsted weight yarn! :D It's usually a size 4 on most yarn labels.
It will depend on the type of yarn. 225 yards of worsted weight yarn is about 100g, but 225 yards of sock weight yarn is about 25g. What is the yarn type?
Solo yarn is a type of yarn with a worsted weight blend of silk as well as mohair with just a touch of wool.
Most 4-ply yarns are medium-weight, which may carry the name worsted weight yarn. Ply is a complicated thing. Thickness and ply of yarn is different depending on where the yarn is manufactured. In the U.S. worsted weight is generally 4 ply. The number of plies is not always an indication of weight, however. It is just tells you how many strands are used in that type of yarn.
4ply is NOT a yarn weight. Many 4ply yarns in the US are worsted weight. DK is a lighter yarn weight.
Phantex is a type of yarn, it's usually cotton, sport or worsted weight. You knit with it like you would with any other worsted weight yarn. If you want some patterns for it you may find some in a craft store or on line.
Cashmere is a type of wool. Cashmere fibre is collected from cashmere goats. Worsted yarn is the tightly twisted woolen yarn spun from long-staple wool. So a tightly twisted cashmere yarn is called worsted cashmere. Just as a caution in case you are buying cashmere. There is a wool act which describes what type of wool is marked as cashmere. Look at RELATED LINKS SECTION for some interesting links which are worth reading about the topic.
Firm-textured yarn.
No, Cascade 220 is worsted weight (a little heavier than DK).
I don't know how many plies it has, but it knits up worsted weight.