All of the sources I can find give the density as exactly 4 oz = 1⁄2 cup, although maybe this is just an approximation that’s infecting other data sources?
https://www.wolframalpha.com/input?i=density+of+butter+*+(1%2F2+cup)+in+ounces
All of the sources I can find give the density as exactly 4 oz = 1⁄2 cup, although maybe this is just an approximation that’s infecting other data sources?
https://www.wolframalpha.com/input?i=density+of+butter+*+(1%2F2+cup)+in+ounces