Butter is the ingredient where unit confusion bites hardest, because it is sold differently everywhere. In the United States it comes as quarter-pound sticks with tablespoon marks printed on the wrapper. In Europe you buy 250 g blocks. In Australia, 500 g blocks. And the recipe in front of you might ask for "1 cup butter", "225 g butter", "2 sticks" or "16 tablespoons" — all of which are the same thing, but only if you know the conversions.
The core numbers every baker should know
Butter is roughly 80% fat, 16% water and 4% milk solids, which makes its density remarkably consistent. One cup of butter weighs 227 g in US recipes — conveniently close to 225 g in European and Australian recipes. That tiny difference is invisible in baking, so treat 1 cup = 225–227 g as identical.
| US sticks | Cups | Grams | Tablespoons |
|---|---|---|---|
| 1 stick | ½ cup | 113 g | 8 tbsp |
| 2 sticks | 1 cup | 227 g | 16 tbsp |
| 3 sticks | 1½ cups | 340 g | 24 tbsp |
| 4 sticks (1 lb) | 2 cups | 454 g | 32 tbsp |
The weight converter and volume converter handle butter instantly, but the table above is worth memorising — it comes up in almost every butter recipe.
Cold, softened, room temperature or melted?
The same 100 g of butter behaves completely differently depending on temperature, and recipes mean very specific states when they name one:
- Cold / straight from the fridge: for pie dough, scones and laminated pastries, where you want distinct flour-coated butter layers that create flakiness.
- Softened / room temperature: for creaming with sugar in cookies and cakes. The butter should yield to gentle finger pressure but still hold its shape. The classic mistake is melting it in the microwave "to speed things up" — melted butter cannot trap air the way softened butter does, and your cookies will spread into puddles.
- Melted: for brownies, banana bread and some bar cookies, where liquid fat is intentional and gives dense, fudgy textures.
How long does softening take? One hour on the counter for a standard stick in a normal kitchen, or 10–15 minutes if you cut it into tablespoon-sized cubes. Avoid the microwave entirely for creamed-butter recipes; for melted-butter recipes it is fine.
How to measure butter without a scale
US sticks make this easy: each stick is marked in tablespoons, so cutting at the mark is precise. Elsewhere, the water displacement trick works when you have no scale: fill a measuring jug to a known level of cold water, add butter until the water level rises by the volume you need. For example, to measure ½ cup of butter, add butter until the water rises by ½ cup. This works because butter's density is close enough to 1 g/ml for measuring purposes.
If you are using our cups to grams converter, the butter entry assumes softened (packed into the cup, no air gaps). A cup of chopped cold butter and a cup of softened butter weigh nearly the same, but softened is easier to pack evenly.
Salted vs unsalted butter
Recipes almost always mean unsalted butter when they just say "butter", because the salt content of salted butter varies by brand (roughly 1.5–2% by weight, or about ¼ teaspoon per stick). If you only have salted butter, reduce added salt by about ¼ teaspoon per stick and expect a slightly firmer, slightly saltier result. In sweet recipes like shortbread, the difference is often welcome; in delicate custards, it can be noticeable.
Clarified butter and ghee
Clarified butter and ghee are butter with the water and milk solids removed, so they weigh more per volume: 1 cup of ghee is about 225 g (nearly the same as butter by weight because the removed water is replaced by concentrated fat). Their fat content is higher (~99%), which makes them ideal for high-heat work and stable at room temperature for months.
Margarine and plant butter
Stick margarines and plant-based butters are formulated to behave like dairy butter and convert 1:1 in most recipes — but tub margarines contain 20–40% water and will change your dough. When substituting, use a stick-style product, keep it cold or softened exactly as the recipe specifies, and expect slightly different browning. Our converter's butter density (227 g/cup) applies to stick-style spreads; for tub spreads, treat them as a different ingredient entirely.
Butter in recipes from around the world
When a British recipe says "butter", it usually means 250 g of the block you bought. An Australian recipe's "125 g butter" is half a 250 g block. An American recipe's "½ cup butter" is one stick. The conversions are consistent across all of them — which is exactly why a quick grams to cups conversion settles the matter before you start creaming.
Butter may be the most forgiving and the most unforgiving ingredient in baking at the same time: it makes almost everything better, yet its temperature determines texture more than any other variable. Measure it right, respect the temperature state, and your shortbread will crumble the way the recipe intended.