Butter is the one ingredient that routinely appears in three incompatible units inside a single recipe collection. American recipes call for sticks and tablespoons, British ones for grams, Australian ones for cups, and none of those translate cleanly because the American stick is a unit of weight wearing a volume costume. The butter converter above handles all of them at once, with the stick size stated explicitly rather than assumed.
Arb Digital publishes free calculators for the small conversions that stop a recipe working. This one is deliberately narrow: it is not a general kitchen unit converter, which we already publish as the cooking measurement converter. It exists because butter has a convention of its own, and applying a generic volume-to-weight rule to it produces answers that are wrong in a way people do not notice until the pastry fails.
What This Butter Converter Does
Enter an amount in any of eight units and read it back in any other, with the four measures a recipe is most likely to want shown together underneath. Sticks, tablespoons, US cups and grams update simultaneously, so a recipe can be translated in one pass rather than one line at a time.
The stick size is a setting, not a constant. A US stick is a quarter of a pound, which is 113.4 grams, and that is the default. Butter sold elsewhere comes in blocks of 200, 250 or 500 grams, and a recipe that says "one stick" written by an author who buys 250 gram blocks means something entirely different. Where a package size is not on the list, the custom option takes any weight.
The volume basis selector is the technical heart of the tool. Choosing the wrapper convention makes one US cup equal 226.8 grams, which is the equivalence every American recipe assumes. Choosing true density uses 0.911 grams per millilitre, which is what butter actually weighs, and gives a noticeably smaller figure for the same cup. Both are correct answers to different questions, and the section below explains which one you want.
How to Use It
- Set the stick size first. If the recipe is American, leave it at the quarter-pound default. If it comes from somewhere butter is sold in blocks, set the block weight before anything else.
- Enter the amount and its unit exactly as the recipe states it, including fractions as decimals — three quarters of a cup is 0.75.
- Pick the unit you want to work in for the headline figure, and use the four-way grid for the rest.
- Leave the volume basis on the wrapper convention unless you are genuinely packing butter into a measuring cup, which is the only case where true density is the right choice.
- Cut on the wrapper markings where you can. It is faster and more accurate than any measuring vessel.
The Numbers Behind the Conversion
Everything starts from the US stick, which is defined by weight:
1 stick = ¼ lb = 4 oz = 113.4 g = 8 tablespoons = ½ US cup
From that, one US cup of butter is two sticks, or 226.8 grams. One tablespoon is an eighth of a stick, which is 14.2 grams, and one teaspoon is a third of that, at 4.7 grams. A pound is four sticks, or 453.6 grams. Those five relationships cover almost every American recipe.
Take the value loaded above: one stick converts to 113.4 grams, which is also 8 tablespoons, half a US cup, and 4 ounces. Scale it and nothing changes: three sticks is 340.2 grams, 24 tablespoons and one and a half cups.
The metric cup is a separate unit at 250 millilitres, against the US cup's 236.6 millilitres, so it is about six percent larger. On the wrapper convention a metric cup of butter comes to 239.6 grams. That six percent is small enough to survive a cake and large enough to matter in a shortcrust, which is why the two cup sizes are listed separately here rather than treated as the same thing.
Why the Cup Marks on the Wrapper Are Not a Density
This is the detail almost every conversion table gets quietly wrong. Butter in the United States is sold by weight — a quarter-pound stick — and the tablespoon and cup markings are printed onto the wrapper so that the stick divides neatly into those units. They are labelling conventions derived from the weight, not measurements of how much space the butter occupies.
Solid butter has a density of roughly 0.911 grams per millilitre. If the cup markings were a true volume measurement, a US cup of 236.6 millilitres would weigh about 215.6 grams, not the 226.8 grams the convention states. The gap is about five percent, and it exists because the convention rounds a quarter-pound stick into a half-cup label rather than the other way round.
In practice this almost never bites, because nobody measures butter by filling a cup with it. It matters in exactly two situations: when you are packing softened butter into a measuring cup because you have no scale, in which case true density is closer to what you will get; and when you are converting a large quantity where five percent is a meaningful weight. For everything else, the wrapper convention is the answer the recipe author intended. Our density calculator handles the general mass-and-volume relationship if you need to work it through for another fat.
Sticks Are Not the Same Shape Everywhere
Two stick shapes are sold in the United States and both weigh a quarter of a pound. The long, thin stick common in the east and the shorter, fatter one common in the west hold identical weight, so every conversion on this page is unaffected. What is affected is anything that depends on dimensions: a recipe that says to slice a stick into eight pats produces different-shaped pats, and one that asks for a stick to be laid across a pastry sheet will not fit the same way.
The wrapper markings themselves are the reliable part. Both shapes are printed with tablespoon divisions along their length, and cutting on a line is accurate to a fraction of a gram. It is genuinely the most precise volume measurement available in a domestic kitchen, which is an odd thing to be able to say about a stick of fat.
Outside the US the whole system disappears. Butter is sold in rectangular blocks of 200, 250 or 500 grams with no markings, and recipes are written in grams because that is what the packaging supports. A block can be weighed or divided by eye against its known total, and our grams to ounces converter and weight converter handle the rest of the translation when a recipe mixes systems.
Salted, Unsalted and What Else Is in the Block
Butter is a standardised product, not simply churned cream. In the United States, the USDA Agricultural Marketing Service grade standards for butter set the requirements a product must meet to be sold and graded as butter, including its minimum milkfat content. Composition data for butter and its salted and unsalted forms, including the fat, water and sodium content, is published in USDA FoodData Central.
The practical consequence for a converter is that not all of a block is fat. Butter carries a meaningful proportion of water, and European-style butters with a higher fat content carry less of it. Substituting one for the other at equal weight changes the water going into a dough, which is why the same pastry recipe behaves differently with different brands even when the grams are identical. The weight conversion is unaffected; the outcome is not.
Salted butter carries added salt, and where a recipe specifies unsalted and you substitute salted, the seasoning changes measurably at the quantities baking uses. The formal definitions of the mass and volume units underlying all of this are maintained by the NIST Office of Weights and Measures, which is also the authority behind the difference between a US cup and every other cup in the world. If you are scaling the whole recipe rather than one ingredient, the cake pan converter handles the tin-size side and the volume converter covers liquids.
Arb Digital publishes hundreds of free calculators across food, finance, health and maths — no sign-up, no limits. If the one you need is missing, tell us and we will look at building it.
Browse All Free Tools Suggest a ToolCommon Mistakes to Avoid
- Assuming a stick is 100 grams — it is a quarter of a pound, which is 113.4 grams. The eleven per cent shortfall is enough to change a pastry.
- Treating a metric cup as a US cup — 250 millilitres against 236.6 is a six per cent difference, small in a cake and significant in shortcrust.
- Applying butter's true density to a recipe's cup measure — American recipes are written against the wrapper convention, so use that unless you are physically packing a cup.
- Reading "one stick" in a non-US recipe as a US stick — an author who buys 250 gram blocks means something more than twice the size.
- Swapping salted for unsalted at equal weight without adjusting — the conversion is unchanged, but the seasoning of the finished bake is not.
Related Free Tools From Arb Digital
For everything that is not butter, the cooking measurement converter handles general kitchen units, while the weight converter and grams to ounces converter cover plain weight and the volume converter covers liquids. The density calculator works out mass and volume relationships for any ingredient, the cake pan converter rescales a recipe between tin sizes, and the cake pricing calculator costs the result if you are baking to sell. Everything else is listed on the free online tools hub.
Frequently Asked Questions
A US stick is a quarter of a pound, which is 113.4 grams. It is also 4 ounces, 8 tablespoons and half a US cup. Butter sold outside the United States comes in blocks of 200, 250 or 500 grams and has no stick equivalent.
Eight, and they are printed on the wrapper. Each tablespoon is about 14.2 grams. Cutting on the printed line is the fastest accurate way to measure butter and needs nothing washing up afterwards.
Two. One US cup of butter is 226.8 grams under the standard convention, which is exactly half a pound. A metric cup of 250 millilitres is about six per cent larger and comes to roughly 239.6 grams on the same basis.
Because the cup and tablespoon markings on a US wrapper are derived from the quarter-pound weight, not measured from the volume. Solid butter is about 0.911 grams per millilitre, so a genuinely volume-measured cup weighs around five per cent less than the convention states.
The wrapper convention, in almost every case, because that is what the recipe author assumed. True density is only the better choice when you are physically packing softened butter into a measuring cup because no scale is available.
No. The long thin stick and the short fat one both weigh a quarter of a pound, so every weight and volume conversion is identical. Only instructions that depend on the physical dimensions are affected.
The weight conversion is unchanged, but salted butter carries added salt, which alters the seasoning of the finished bake at the quantities baking uses. Recipes that specify unsalted do so precisely so the salt can be controlled separately.
Not by weight. It does carry a higher fat content and correspondingly less water, so substituting it at equal weight changes the water going into a dough, which is why the same pastry can behave differently across brands at identical grams.
This converter applies standard unit relationships to figures you supply and is provided for general reference. Package sizes, composition and labelling conventions vary between countries and between brands, so check the weight printed on the packaging you are actually using before relying on a stick or block equivalence.
