Convert pattern from chunky yarn to worsted

I have a pattern for a vest that is done in a chunky weight yarn. I would like to convert this to a worsted weight to make a lighter weight vest. Is there a formula to convert the existing pattern? Any help or suggestions would be great.

You can knit a sample with the yarn and needles you’d like to use and see if that will get you the right number of sts/inch to make a larger size of the pattern. Take your sts/inch times the measurement you want and compare it to the front and back stitch numbers.

:happydance: Thank you