The question arose in a pie-crust thread and I thought I'd clear it
up. Based on the sodium content of salted butter (Land O Lakes, 95 mg
per Tbsp) and the sodium content of table salt (590 mg per 1/4 tsp is
what my box of salt says) it appears that there is about 1 1/4
teaspoons of salt in a pound of butter, or a bit over a
quarter-teaspoon in a 4 oz stick.

Adjust your recipes accordingly. Or not. :-)
--
Best -- Terry