This is an easy filet crochet pattern! The gauge is not important and the finished size will depend upon which hook size and which thread size one uses.

The pattern suggests using Size 10 crochet thread and a steel hook size within the range of 1.25 mm - 1.7 mm.

One ball of size 10 crochet thread will easily make a doily with up to 9 letters, if not more.