for popcorn:
a little less than 1 cup of un-popped kernels.
approximately 6-7 quarts of air popped corn


for caramel: 
  * 270 grams (2/3 cup) corn syrup
  * 270 grams ( 1.25 cups ) brown sugar
  * 170 grams (3/4 cup) (1.5 sticks) butter
  * 1 teaspoon salt


Cook over medium heat then add in the following after it gets frothy
Add them in slowly as it will froth up even more
  * 1 teaspoon vanilla extract
  * 5 grams (3/4 teaspoon) baking soda

pour caramel over popped corn

Adapted from 
https://bakerbynature.com/the-best-caramel-corn-recipe/
https://triedinblue.blogspot.com/2013/01/flashback-friday-grandmas-old-fashioned.html?m=1