Why a US Recipe Fails in the UK — Butter Sticks, Cup Sizes, Tablespoon Volumes, and Egg Standards Compared
Scooping flour vs spooning it into a cup creates a 20-30% weight difference for the same "cup" measurement — and that's before accounting for the fact that US cups (237 mL), UK cups (284 mL old / 250 mL new), and Australian cups (250 mL) are different sizes. Here's the butter stick convention no one outside the US knows, why Australian tablespoons are 33% larger than US ones, and why UK large eggs are closer to US extra-large.