About CupMath

CupMath does one thing: it scales recipe measurements and tells you exactly which cups and spoons to use for the result. Halving ¾ cup, thirding a tablespoon, doubling ⅔ cup — the fractions that make you stop mid-recipe and reach for your phone.

How the numbers are calculated

Every conversion is computed with exact fraction arithmetic — no floating-point rounding — using the standard US customary ladder:

• 1 cup = 16 tablespoons = 48 teaspoons = 8 fl oz ≈ 237 ml
• 1 tablespoon = 3 teaspoons ≈ 14.8 ml
• 1 stick of butter = ½ cup = 8 tablespoons = 113 g

When a scaled result isn't measurable with standard cups and spoons (a twelfth of a teaspoon, say), we say so and give the closest practical measurement instead of pretending precision that your spoon drawer can't deliver.

Gram weights follow widely used US baking references: 120 g per cup of spooned-and-leveled all-purpose flour, 200 g per cup of granulated sugar, 227 g per cup of butter, and so on. Different flours and techniques vary — for critical baking, weigh your ingredients.

Questions or corrections

Spotted something off, or want a measurement added? Get in touch — corrections are genuinely welcome.