How much yarn to cast on 238 stitches with needles size 10?

Question

How much yarn to cast on 238 stitches with needles size 10?

Answer 1

Wind the yarn around the needle 238 times and then add a couple inches for the tail

Answer 2

this will depend on the thickness of the yarn and the type of cast on being used.  Be more detailed in your question to obtain better answers

Answer 3

About 8 yards of yarn for a standard knitted on cast on, long tail will take about twice as much to start with.