Salted/Unsalted Butter

1/2 cup salted butter = 1/2 cup unsalted butter + 1/4 teaspoon of salt

1. Basically, that means if your recipe calls for unsalted butter and you want to use salted, reduce the amount of salt by 1/4 teaspoon.
2. If your recipe calls for salted butter and you're using unsalted, increase the amount of salt by 1/4 teaspoon.