If you have a 1/4 cup measure, your life just got easier. Three of those stacked together make 3/4 cup. It’s child’s play—literally, because toddlers learn this stacking concept before they can talk.
Only have a 1/3 cup? That’s 4 tablespoons, so you need two and a quarter of them. Eyeballing the extra quarter is fine for things like flour or oats, but for baking, be precise: fill the 1/3 cup twice, then add 2 tablespoons (or half of that 1/3 cup if you can eye it).
Pro tip: For liquids, fill a 1/2 cup measure to the brim, then add exactly 1/4 cup. That’s your 3/4. It feels like a barista-level hack, and you’ll look cool doing it.