No. 01
unsalted butter
Most stick-fat swaps are 1:1 by weight, with carve-outs. Salted/unsalted: 1:1 +/- ~1/4 tsp salt per 1/2 cup (113 g, 1 stick). Shortening, ghee, lard, duck fat, and beef tallow are 1:1 by weight in most cookies, biscuits, pastry, and frying but cannot laminate or brown. Stick vegan butter and baking margarine are 1:1 only at 80%+ fat; tub spreads and coconut/cocoa butter are not 1:1.
Solid fats swap 1:1 by weight in most baking and cooking, but butter alone laminates and browns. Shortening, ghee, lard, and 80%+ stick vegan butter or margarine cover most other jobs; tub spreads, coconut butter, and cocoa butter are not 1:1.
No. 02
neutral oil
Butter (~80% fat): ~3/4 cup oil per 1 cup butter (~165 g/227 g). ~100% fat solids (shortening, ghee, lard, duck fat, tallow): ~1:1 by weight. Clean in melted-butter bakes (brownies, muffins, quick breads, oil-friendly cakes) and butter cakes lifted by baking powder. Sauteing 1:1 (oils ~400-450 F vs butter ~350 F). Out of scope: laminated doughs, creamed butter cakes, cut-out cookies, brown-butter.
Oil replaces butter cleanly in melted-butter recipes and high-heat cooking but cannot cream, laminate, or brown.
No. 03
salted butter
Most stick-fat swaps are 1:1 by weight, with carve-outs. Salted/unsalted: 1:1 +/- ~1/4 tsp salt per 1/2 cup (113 g, 1 stick). Shortening, ghee, lard, duck fat, and beef tallow are 1:1 by weight in most cookies, biscuits, pastry, and frying but cannot laminate or brown. Stick vegan butter and baking margarine are 1:1 only at 80%+ fat; tub spreads and coconut/cocoa butter are not 1:1.
Solid fats swap 1:1 by weight in most baking and cooking, but butter alone laminates and browns. Shortening, ghee, lard, and 80%+ stick vegan butter or margarine cover most other jobs; tub spreads, coconut butter, and cocoa butter are not 1:1.