Replacing Salted Butter With Unsalted. The general rule of thumb is to use unsalted butter for sweet dishes and cakes especially when the butter makes up a significant percentage of the whole dish. Then adjust the amount of salt in the recipe to account for the extra salt in the butter.
Then adjust the amount of salt in the recipe to account for the extra salt in the butter. Well it depends on the salt content in the butter. Thats because theres really no way of knowing how much salt has been added and levels vary from brand to brand.
On the average one stick of butter -- a quarter-pound or half-cup -- contains 14 to 38 teaspoon of salt.
Salted Butter Substitute Its less common that youll find a recipe that calls for salted butter when you only have unsalted on hand but if you do just apply the above steps backwards. But there are exceptions. While I like having the control of using unsalted butter then adding in the salt on its own you can swap unsalted for salted. Our Test Kitchen experts explain the difference between the two and recommend when you should use each.