Approximate finished sizes in filet crochet (once through one chart, worked in 4 dc mesh):

With size 5 thread: (720 yards) and a size US 4 steel hook, finished size is about 20.8 inches x 23.8 inches.
With size 10 thread: (641 yards) and a size US 7 steel hook, finished size is about 17.2 inches x 18.8 inches.
With size 20 thread: (602 yards) and a size US 9 steel hook, finished size is about 16.5 inches x 18 inches.
With size 30 thread: (562 yards) and a size US 11 steel hook, finished size is about 15.8 inches x 17.2 inches.
With fingering/baby weight yarn: (1406 yards) and a size US F hook, finished size is about 52.5 inches x 54 inches.
With sport weight yarn: (1631 yards) and a size US G hook, finished size is about 60 inches x 61.5 inches.
With worsted weight yarn: (1856 yards) and a size US I hook, finished size is about 67.5 inches x 69 inches.

Gauge:

With size 5 thread: 5 squares = 1.4 inches, 5 rows = 1.6 inches
With size 10 thread: 5 squares = 1.2 inches, 5 rows = 1.3 inches
With size 20 thread: 5 squares = 1.1 inches, 5 rows = 1.2 inches
With size 30 thread: 5 squares = 1 inch, 5 rows = 1.1 inches
With fingering/baby weight yarn: 5 squares = 3.5 inch, 5 rows = 3.6 inches
With sport weight yarn: 5 squares = 4 inch, 5 rows = 4.1 inches
With worsted weight yarn: 5 squares = 4.5 inch, 5 rows = 4.6 inches