First time corned beef. Calculation mistake?

Hey guys, so I’m making corned beef for the first time from the recipe at [https://amazingribs.com/tested-recipes/beef-and-bison-recipes/home-made-corned-beef-recipe/](https://amazingribs.com/tested-recipes/beef-and-bison-recipes/home-made-corned-beef-recipe/)

I followed their calculator for how much prague powder to use, but I realized today that I cut my chunk of brisket in half to fit my container better. Does that mean I used to much prague powder #1?

Would appreciate any advice

by maybeinmykitchen