How much salt is in salted or unsalted butter?
Similarly one may ask, how much salt is in salted butter vs unsalted?
But here's a general rule: reduce or add 1/4 teaspoon of salt per 1/2 cup (1/4 lb; 115g; 1 stick) of butter. Explained: If you come across a recipe that calls for salted butter and all you have is unsalted butter, use unsalted butter and increase the salt in the recipe by 1/4 teaspoon for every 1/2 cup of butter.
In respect to this, how much salt is in a cube of salted butter?
Depending on brand, it is approximately 1 1/4 tsp per pound (US), or a little more than 1/4 tsp per stick (4 oz). For most applications, yes it is fine to substitute and adjust; you can just adjust the "salt to taste" step of your recipe in many cases.
Regular butter contains some salt, and most recipes take this into account. But if you only have unsalted butter when the recipe calls for regular butter, you can add a ¼ teaspoon of salt for every stick or ½ cup of Challenge Unsalted Butter required.