These are very valuable tools for any designer. Check them out.
When designing patterns these charts are my life savers!! I thought you might find them helpful too!
This first chart is for babies:
I used this chart to help me makes these cute props.
It can be found at: http://pattern-paradise.com/2013/10/05/crochet-patterns-baby-measurements-sizes/
Another of my favorites for hat making :
And this blanket chart can be found at the same site:
Visit this last page for many more charts with hook conversions and more!!
Hope you find the charts as useful as I have!!