Butter Calculator

What one stick of butter is

American butter comes wrapped in sticks, and every stick is the same four things at once: 113 grams, 4 ounces, 8 tablespoons and half a cup. That single identity solves most recipe questions, because the wrapper is printed with tablespoon marks and the box holds exactly 4 sticks, one pound, or 454 grams.

So the ladder runs: 1 tablespoon is half an ounce, 8 tablespoons are one stick, 2 sticks are one cup, and 4 sticks are one pound. Halve it and a quarter stick is 2 tablespoons, 28 grams, an eighth of a cup.

Metric countries skip the stick and sell blocks, usually 250 grams. A 250 g block is 2.21 US sticks, close to two sticks plus a tablespoon and a half, which is where imported recipes go wrong. European recipes written for a 250 g block want about 2 sticks plus 2 extra tablespoons to land on the same weight.

The 250 g block is the one that catches American bakers, because it looks like two sticks and weighs 24 g more.

Why weight beats volume for butter

A cup of butter is 226 grams only when the butter is a solid block cut to the line. Butter that sat in a warm kitchen, butter whipped with air, and butter packed into a cup all measure differently by volume while weighing the same. One cup of whipped butter can weigh a third less than one cup of block butter, and the recipe never knows until the cookies spread.

Weight fixes that. If a recipe lists cups, this calculator converts them to grams once, and from then on the scale settles every question: 113 g, no matter how cold, soft or whipped the butter was. Professional bakeries work in grams for the same reason.

The one place volume still wins is the wrapper. US sticks carry tablespoon marks on the paper, so for a tablespoon or two you can slice on the printed line and be within a gram. Past half a stick, put the bowl on the scale.

Butter conversion chart

The whole ladder in one table, with calories from USDA data at 717 kcal per 100 g.

Read it in both directions: a recipe asking for 170 grams of butter wants 1.5 sticks, three quarters of a cup, or 12 tablespoons. The calories column comes from the same weight math, 7.17 kcal per gram, so it scales with whatever amount you enter above.

How much butter to buy

Butter is sold in 1 pound boxes of 4 sticks, so the shopping question is how many sticks a recipe needs, then how many boxes cover them with margin.

• A cookie recipe with 1 cup of butter: that is 2 sticks, half a box. Buy one 1 pound box and you have 2 sticks left.
• A triple batch: 2 × 3 = 6 sticks, which is 1.5 pounds. One box is not enough, so buy 2 boxes and the spare half box freezes for months in its wrapper.
• Toast for 40 people at 1 tablespoon each: 40 tablespoons is 5 sticks, 1.25 pounds, so 2 boxes again.
• A holiday baking day totaling 10 cups: 20 sticks is 5 pounds, exactly 5 boxes.

The freezer is the reason to round up rather than down. Butter keeps its quality for months frozen, and a half box short of a recipe has no substitute that behaves the same way in dough.

Calories and fat, straight from USDA data

Butter is one of the most calorie dense foods in the kitchen. USDA FoodData Central lists salted butter at 717 kcal per 100 g with 81.1 g of fat, of which 51.4 g is saturated. Translated to kitchen units, one tablespoon (14.2 g) is about 102 kcal and 11.5 g of fat, and one stick is about 810 kcal.

Butter also carries vitamin A, about 684 micrograms RAE per 100 g, roughly three quarters of a day's requirement in 100 g, though nobody eats 100 g of butter on purpose. Cholesterol runs 215 mg per 100 g.

The fat number explains the substitution ratios used elsewhere on this site. Butter is about 80 to 82 percent fat and 16 percent water, which is why 3/4 cup of oil, all fat, replaces 1 cup of butter in recipes. Any calculator that treats butter as pure fat will overestimate what it does in a pan.

Federal law sets the floor for what can be called butter: the product must be made from milk or cream and hold not less than 80 percent milkfat by weight, as 21 U.S.C. 321a states, and the FDA sets the rules for nutrient content claims for butter. That is why a label can say reduced fat butter only under a set of rules, and why the fat percentage on the wrapper is the number worth reading.

Salted or unsalted, and how much salt is inside

Salted butter is unsalted butter with salt stirred in. USDA data puts salted butter at 643 mg of sodium per 100 g, which is about 91 mg per tablespoon and 727 mg per stick, close to a third of a teaspoon of table salt per stick. Unsalted butter sits at 11 mg per 100 g, essentially none.

Bakers reach for unsalted because the salt dose then belongs to the recipe, not the brand. Salt levels in salted butter vary between makers, and a dough that tastes right with one brand can come out flat or sharp with another.

Swapping is easy arithmetic. If a recipe written for unsalted butter and you only have salted, use the same weight and drop about 1/4 teaspoon of added salt per stick of butter in the bowl. The reverse, unsalted standing in for salted, works with 1/4 teaspoon of salt added per stick. In either case keep the butter weight identical, since salt is a seasoning and not a structural ingredient in most doughs.

Both columns come from USDA FoodData Central, and the gap is the whole reason bakers keep two kinds in the fridge.

Melting, browning and softening change the math

Melting changes nothing but shape. A stick weighs 113 g solid, liquid or anywhere between, so melted butter measured by weight is exact, while melted butter poured into a cup measure clings to the sides and can short the recipe by a teaspoon or more.

Browning does change the weight. Beurre noisette drives off the water in butter as steam, and a pan that started with 113 g can lose roughly 15 to 20 percent of its weight by the time the milk solids toast. Recipes that call for browned butter by weight expect that loss, so weigh the butter before the pan, not after.

Softening is a temperature question, not a weight one. Butter creams best at 65 to 67 F, cool enough to hold shape but soft enough to leave a shallow dent when pressed. Melted or oily butter cannot trap air, and that is what turns creamed sugar and butter from fluffy to flat.

Mistakes this calculator catches

Calling a stick a cup. One stick is half a cup. A recipe that needs 2 cups wants 4 sticks, a whole box, and stopping at 2 sticks leaves half the butter out.

Assuming a 250 g block is 2 sticks. It is 2.21 sticks. Measuring by weight instead of guessing the difference is 24 grams of fat, enough to feel in shortbread.

Measuring whipped butter by volume. Whipped butter has air beaten in, so a cup of it weighs far less than 226 g. Use the weight of regular butter as the target, or add about half again as much whipped butter by volume.

Ignoring the salt in salted butter. Each salted stick brings about a third of a teaspoon of salt, and it stacks. Six sticks of salted butter in a dough carry about 2 teaspoons of salt before the recipe adds any.

Measuring soft butter in a tablespoon. A level tablespoon of butter is 14.2 g, but a heaping one can hold 20 g. On a 16 tablespoon recipe that is nearly a quarter stick of drift, which the scale removes.