Butter Conversion Calculator

American recipes measure butter in sticks, tablespoons or cups; UK recipes use grams; older cookbooks use ounces. The conversions are exact once you know the reference: 1 US stick = 113 g = 4 oz = 8 tablespoons = ½ cup. We pivot every conversion through grams using these standards.

How the calculation works

We convert your input into grams, then divide by the gram-equivalent of the target unit. A US tablespoon of butter is 14.2 g; a US cup is 227 g (effectively 2 sticks). Because butter is dense and consistent, these conversions are far more reliable than dry-ingredient cup conversions.

A worked example

An American cookie recipe calls for 1½ sticks of butter. That's 1.5 × 113 = 170 g, or about 12 tablespoons. A UK recipe asking for 250 g of butter is just over 2 sticks (250 ÷ 113 ≈ 2.2) or roughly 17½ tablespoons — close enough to a standard UK 250 g block to use the whole thing.

Why this matters

Butter is structural in most baked goods. Get the quantity wrong by 20% and a shortbread becomes greasy, a sponge collapses, or a puff pastry refuses to laminate. Because butter often dominates the fat content of a recipe, even small conversion errors show up in the result. Knowing the precise gram value also makes it easy to halve or double a recipe without guessing — pair this with the Recipe Scaler when you're cooking for a different headcount.

Common mistakes

• Assuming a UK pack of butter equals a US stick. UK butter usually comes in 250 g blocks, not 113 g sticks.
• Measuring soft butter in cups. Cold butter compresses very little; soft butter packs tightly and over-measures by 10–15%.
• Confusing US sticks with European blocks. European butter is sold in 200 g, 250 g or 500 g packs.
• Reading "1 cup butter" as the same as "1 cup oil". They have different densities and aren't interchangeable in a recipe.

Beyond the numbers

American sticks of butter exist because of the wrapper. In the 1900s, an Iowa dairy packaged its butter in pre-cut sticks marked with tablespoon graduations, and home cooks loved it — recipes could just say "1 stick" and the wrapper did the maths. The format stuck and shaped a century of US baking. UK butter never went down that path, which is why our blocks are sold in solid 250 g pieces and recipes here lean on the scale.

Salted versus unsalted matters more than the units. UK salted butter typically contains 1.5–2% salt by weight — enough to noticeably shift the seasoning in a sweet recipe. American baking books almost always assume unsalted; if you're working from one and only have salted, reduce or omit any added salt. "Spreadable" butter blends contain vegetable oil and behave differently in pastry, so they shouldn't be substituted at the same weight in laminated dough or shortcrust.

Useful neighbours: Cups to Grams for the rest of the ingredients, Oven Temperature for the dial, and the Recipe Scaler when the headcount changes.