My wife is baking and the recipe calls for salted butter. We have unsalted. Can we add salt to unsalted butter?

1 table spoon of most salted butter contains about 90 mg of sodium. 1/4 teaspoon of salt contains about 480 mg sodium so while the sodium in salted butter is negligible (originally added as a preservative), if your recipe calls for a stick (four tablespoons) of salted butter, in theory you could add about 1/8th teaspoon of table salt to compensate.

Thank you! After I posted the question, I also found the advice from a number of members (yourself included) to always cook with unsalted butter. We'll follow your advice here. Thanks for the help!

Yes, of course! The amount of salt in salted butter is quite variable, but think along the lines of adding 1 to 2 teaspoons per pound of butter.