Knitting needle sizes range from 2.0mm right up to 25.0mm, and just to make it even more complicated there are three main measurement schemes for needles sizes.
Knitting Needle Metric-US-UK Size Conversion Chart
Knitting Needle Sizes and Conversion Chart (Free Printable
This is a cute and to-the-point knitting needle conversion chart to easily download and print to use in your knitting bag, purse, pattern folder or
Knitting Needle Conversion Chart, Knitting Accessories
Knitting needle sizes & Conversion chart [+ recommentation for
Knitting Needle Sizes Chart and Conversion Guide - Sarah Maker
Knitting Needle Sizes and Conversion Chart (Free Printable
Knitting Needle Conversion Chart (Plus The Ultimate Guide To
Knitting Needle Sizes and Conversion Chart (Free Printable
Knitting Needle Conversion Chart (Plus The Ultimate Guide To
Knitting Needle Sizes Explained + Printable Conversion Chart