Hi Lisa! Thought you might be interested in this recent article: https://food52.com/blog/15584-can-you-swap-salted-and-unsalted-butter-in-baking#:~:text=The%20original%20recipe%20with%20unsalted,teaspoon%20to%20the%20salted%20version.
Annie, the author, mentions (very helpfully!) that the standard estimate is that salted butter contains 1/4 teaspoon of salt per 4 ounces of butter (1 stick). However, these salt levels can vary from brand to brand—something worth keeping in mind!
I run into this same problem. It’s not often I see a pastry recipe using salted butter, but it does happen occasionally. I usually add 1/2 tsp of fine sea salt for each 1 1/2 cups of flour in the recipe. Good luck!
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Annie, the author, mentions (very helpfully!) that the standard estimate is that salted butter contains 1/4 teaspoon of salt per 4 ounces of butter (1 stick). However, these salt levels can vary from brand to brand—something worth keeping in mind!