DK or double knitting yarn is very similar in thickness to sport yarn. 50 g is a tad more than 1.75 ounces.

This was my first time posting and it was so nice to get an answer right away.
Donna, Thank you so much for helping me.

Perhaps this will help?

Weight~~~~~~~~~~Stitches~~~~~Inches~~~~~Needle Size
Fingering Weight~~~28sts~~~~~~4 inches~~~~~~~1-3(baby yarn)
Sport Weight~~~~~24sts~~~~~~4 inches~~~~~~~3-5
Double Knit Weight~20sts~~~~~~4 inches~~~~~~~4-6
Worsted Weight~~~24sts~~~~~~4 inches~~~~~~~5-7
Worsted Weight~~~20sts~~~~~~4 inches~~~~~~~6-8(larger)
Bulky Weight~~~~~16sts~~~~~~4 inches~~~~~~~10-13