Gotta love crochet - but it can be a problem when the pattern you want to use comes from a different part of the world. A double crochet in North America is not the same a double crochet in the United Kingdom.
In general, it seems that in the UK the number of loops on the hook including the first loop that's already on your hook influences its name, but in North America it's the number of loops excluding that loop. The chart below may be of some assistance to you if you're attempting to crochet a pattern written the "other" way.
We also have a Crochet Hook Conversion Chart.
North America: United Kingdom: skip skip / miss chain chain slip stitch slip stitch / single crochet single crochet double crochet double crochet treble crochet half double crochet half treble crochet triple / treble crochet double treble crochet double treble crochet triple treble crochet
This web site is made in Canada.