Crochet F hook in mm measures 3.75mm, a common size for sport to DK weight yarn, giving a tighter, denser fabric than a larger hook would produce with the same yarn. I keep this exact size in regular rotation for amigurumi work. This guide gives the direct measurement and common pairing.
Direct Answer
The F hook measures 3.75mm. It sits between the E hook at 3.5mm and the G hook at 4.0mm on a standard letter-lettered hook size chart.
Common Uses
Amigurumi, lightweight garments, and anything wanting a tighter, more structured gauge than worsted weight projects typically pairs well with an F hook and sport to DK weight yarn.
Frequently asked questions
What comes after the F hook in size?
The G hook, measuring 4.0mm, is the next size up from the F hook on a standard letter-lettered crochet hook chart.
Want the full hook size chart?
See every standard hook size in millimeters at a glance.
See the full hook size chart