8 Ounces in Cups
8 oz in cups depends on the ingredient: 8 oz of flour is about 1.9 cups, and 8 oz of butter is 1 cup. Eight ounces in cups is the conversion where weight and volume collide, because the answer depends on the ingredient: eight ounces of flour is about 1.9 cups, while eight ounces of butter is exactly 1 cup. The trap is the fluid ounce, which measures volume, and the weight ounce, which measures mass, and they are only equal for water. This page gives the per-ingredient table and explains the trap in full.
Why this conversion exists
Grams measure mass and cups measure volume, and the bridge between them is density, which is different for every ingredient. A cup is always 236.59 ml of space, but what that space weighs depends on what fills it: a cup of flour weighs 120 g, a cup of granulated sugar weighs 198 g and a cup of butter weighs 227 g, and across the 120 ingredients in our table the figure runs from 48 g for dried oregano to 340 g for molasses. That is why this page gives a table instead of a single number, and why every figure on it is labelled approximate. Confusing volume with weight is how a cake ends up too dry or too sweet: the recipe asked for a weight and the cook supplied a volume, or the other way round. Keep the two apart, use the table for the ingredient in your bowl, and weigh the ingredient on a scale whenever the recipe matters.
8 Ounces in Cups conversion table
| Ingredient | Grams per cup | Cups | Method |
|---|---|---|---|
| All-Purpose Flour | 120 g per cup | 1.89 cups | spooned and levelled |
| Granulated Sugar | 198 g per cup | 1.15 cups | spooned and levelled |
| Butter | 227 g per cup | 1 cup | scooped |
| Brown Sugar | 213 g per cup | 1.06 cups | packed |
| Honey | 336 g per cup | 0.67 cups | poured |
| Cocoa Powder | 84 g per cup | 2.7 cups | spooned and levelled |
| Milk | 244 g per cup | 0.93 cups | poured |
| Rolled Oats | 89 g per cup | 2.55 cups | spooned and levelled |
The gram-per-cup figures in the table come from the King Arthur Baking ingredient weight chart and USDA FoodData Central, and every converted figure is computed from them, so the table is consistent: the same density gives every row. All the converted figures are approximate, because densities are measured one way in one laboratory, and your kitchen will differ by a few grams. When a bake really matters, verify with a kitchen scale.
The same conversion for flour, sugar and butter
The table above covers eight ingredients. The table below gives the same conversion for the three ingredients that appear in most recipes, at the amounts cooks actually use, so the common cases are all in one place.
| Ounces | All-purpose flour | Granulated sugar | Butter |
|---|---|---|---|
| 2 oz | 0.47 cups | 0.29 cups | 0.25 cups |
| 4 oz | 0.94 cups | 0.57 cups | 0.5 cups |
| 8 oz | 1.89 cups | 1.15 cups | 1 cup |
| 16 oz | 3.78 cups | 2.29 cups | 2 cups |
Worked examples
Ground coffee for a cafetiere calling for 8 oz of all-purpose flour
A ground coffee for a cafetiere recipe that calls for 8 oz of all-purpose flour needs 1.89 cups. Coffee is dosed by weight, and the difference between two ounces and three is the difference between a weak brew and a strong one, so the gram figure is the one to trust. Put the bowl on the scale, press tare to zero it, and only then add the ingredient, so the bowl's weight is not part of the reading. That is the figure to measure: 8 oz in the units the recipe uses, or 1.89 cups on a scale or in a cup, whichever the recipe asks for. The figure is approximate, because it comes from the King Arthur Baking density of 120 g per cup, measured spooned and levelled, so when the bake really matters, verify with a kitchen scale. A recipe that calls for 8 oz of all-purpose flour and gets 1.89 cups will behave as written, and a recipe that uses another ingredient's figure instead will not, because a cup of one ingredient weighs nothing like a cup of another.
Grated cheddar for a gratin calling for 16 oz of granulated sugar
A grated cheddar for a gratin recipe that calls for 16 oz of granulated sugar needs 2.29 cups. Cheese for a gratin is weighed in ounces and scattered by the cup, and the weight is what decides whether the topping is generous or stingy. Use grams for anything under a pound, because grams are finer than ounces and the target is easier to hit exactly. That is the figure to measure: 16 oz in the units the recipe uses, or 2.29 cups on a scale or in a cup, whichever the recipe asks for. The figure is approximate, because it comes from the King Arthur Baking density of 198 g per cup, measured spooned and levelled, so when the bake really matters, verify with a kitchen scale. A recipe that calls for 16 oz of granulated sugar and gets 2.29 cups will behave as written, and a recipe that uses another ingredient's figure instead will not, because a cup of one ingredient weighs nothing like a cup of another.
Caster sugar for meringues calling for 4 oz of butter
A caster sugar for meringues recipe that calls for 4 oz of butter needs 0.5 cups. Meringue is a ratio of egg white to sugar by weight, and the sugar is the part that has to be exact, because too little makes a weeping meringue and too much makes it gritty. Weigh the ingredient straight into the mixing bowl when you can, because every transfer loses a little of it. That is the figure to measure: 4 oz in the units the recipe uses, or 0.5 cups on a scale or in a cup, whichever the recipe asks for. The figure is approximate, because it comes from the King Arthur Baking density of 227 g per cup, measured scooped, so when the bake really matters, verify with a kitchen scale. A recipe that calls for 4 oz of butter and gets 0.5 cups will behave as written, and a recipe that uses another ingredient's figure instead will not, because a cup of one ingredient weighs nothing like a cup of another.
Scaling the recipe up and down
Scaling works the same way in both directions, and flour is the example here because it is the ingredient most recipes scale. Double the recipe and 8 oz of all-purpose flour becomes 3.78 cups. Halve it and you need 0.94 cups. The same arithmetic applies to every ingredient in the table, using that ingredient's own density: double the amount, double the converted figure, and the ratio holds. When you scale, always scale by weight if the original recipe was written in grams, and by volume if it was written in cups, because mixing the two mid-recipe is how scaling errors creep in. And remember that the figures are approximate, so a scaled recipe is only as accurate as the original conversion: weigh the scaled amount on a scale rather than trusting the scaled cup figure.
How the conversion is defined
The gram figures on this page come from the King Arthur Baking ingredient weight chart and USDA FoodData Central, the two sources used across this site. Dry ingredients are measured spooned and levelled, which means the ingredient is spooned loosely into the measuring cup and the top is swept flat with a straight knife, never scooped and never pressed down. Butter is measured scooped, because it is a solid fat pressed into the cup, and liquids are measured poured into a jug and read at eye level. Every density-based result on this page is approximate, so when a recipe really matters, verify with a kitchen scale. Two figures on this page carry a dispute worth knowing about. Flour is the most disputed conversion in baking: King Arthur lists 120 g per cup spooned and levelled, while other sources quote 125 g, 130 g and up to 142 g for a scooped cup, so this page uses the King Arthur spooned-and-levelled value. Granulated sugar is listed at 198 g per cup by King Arthur while USDA rounds it to 200 g; the 2 g difference is rounding, not a real disagreement, and this page uses 198 g.
Weight ounces versus fluid ounces: the trap to avoid
The ounce is two different units with the same name. A weight ounce measures mass, and one of them is 28.35 g. A fluid ounce measures volume, and one of them is 29.57 ml. They are only equal for water, which weighs 28.35 g per fluid ounce by a happy coincidence of the two systems. For anything else they diverge: eight fluid ounces of flour is one cup, which weighs 120 g, while eight weight ounces of flour is 226.8 g, which is about 1.9 cups. Recipes, packets and jugs all mix the two, so the rule is to check the context: a jug measures fluid ounces, a scale measures weight ounces, and a recipe that says 8 oz of flour means weight, while a recipe that says 8 fl oz of milk means volume. When in doubt, convert by weight, because the scale cannot be confused about which ounce it means.
Common mistakes
- Confusing weight ounces with fluid ounces. A weight ounce measures mass and a fluid ounce measures volume, and they are only equal for water. Eight weight ounces of flour is about 1.9 cups, while eight fluid ounces is exactly 1 cup, and mixing them up is the commonest conversion error in the kitchen.
- Weighing in a container without taring. A bowl or jug adds its own weight to the reading. Put the container on the scale, press tare to zero it, and only then add the ingredient.
- Trusting a packet weight for a cup measure. A packet that says 8 oz contains 8 oz by weight, but the cups in it depend on the ingredient. Use the weight on the scale, not the volume in the cup, when the recipe gives grams.
- Rounding ounces to the nearest whole number too early. Rounding 3.53 oz to 4 oz adds 13 g, which is a real error in a small recipe. Keep one decimal place until the final measurement, then round.
Practical guidance
Weighing is the most accurate way to measure anything in the kitchen, and the practical habit that makes it work is taring the scale: put the empty bowl on the scale, press tare to zero it, and only then add the ingredient. Without that step, the bowl's weight is part of the reading, and the error is the weight of the bowl. Use grams for anything under a pound, because grams are finer than ounces and the reading is easier to hit exactly: 100 g is a cleaner target than 3.53 oz. Keep the scale on a flat, stable surface, away from the edge of the counter, and away from steam, because a wobbling scale and a steaming pot both move the reading. When a recipe gives ounces and your scale reads grams, use the table on this page rather than converting in your head, because the arithmetic is where errors happen. And remember that a weight ounce and a fluid ounce are different units: a scale measures weight ounces, a jug measures fluid ounces, and they only agree for water.
Frequently asked questions
Does packing change the answer?
Yes, and for some ingredients it changes it a great deal. Brown sugar is measured packed at 213 g per cup, while loosely spooned it weighs about 170 g, so packing is part of the number for brown sugar and muscovado. Flour, sugar and cocoa powder are measured spooned and levelled, never packed, because packing them adds grams the recipe did not ask for. Butter is measured scooped, because it is a solid fat that has to be pressed into the cup to fill it.
How many cups is 8 oz?
8 oz in cups depends on the ingredient: 8 oz of flour is about 1.9 cups, and 8 oz of butter is 1 cup. The table above lists the same conversion for eight ingredients cooks use most often, and the second table gives the figures for the three ingredients that appear in most recipes: all-purpose flour, granulated sugar and butter. Every figure is approximate, because it comes from a density, so when a bake really matters, verify with a kitchen scale.
Why does the answer depend on the ingredient?
Because this conversion crosses from volume to weight, or from weight to volume, and the bridge between them is density, which is different for every ingredient. A cup is always 236.59 ml of space, but what that space weighs runs from 48 g for dried oregano to 340 g for molasses across the 120 ingredients in our table. That is why this page gives a table instead of a single number: the conversion is a property of the ingredient, not of the unit.
Which ingredient's figure should I use?
The figure for the ingredient in your bowl, not the figure for the ingredient in the example. A cup of sugar weighs 198 g and a cup of cocoa powder weighs 84 g, so swapping their conversions more than doubles the error. Find your ingredient in the table, read its row, and use that figure. If your ingredient is not in the table of eight, use the cups-to-grams page for that ingredient, which is linked below.
How accurate are the figures on this page?
They are approximate, and they are honest about it. The densities come from the King Arthur Baking ingredient weight chart and USDA FoodData Central, measured spooned and levelled for dry ingredients, packed for brown sugar, scooped for butter and poured for liquids. Packing, moisture and brand all move the real weight by a few grams, so a kitchen scale is the only way to know the exact weight. For cooking, the table is more than accurate enough; for baking, weigh the ingredient.
Related conversions
Use the ounces to grams converter, pounds to grams converter, weight converter for instant answers, or browse the units hub for every conversion on this site. For the weight of the same ingredients by the cup, see all-purpose flour in grams, granulated sugar in grams and butter in grams. Nearby pages in this series: 16 ounces in grams, 4 ounces in cups, 1 pound in cups of butter. See also our disclaimer about approximate conversions and about CookScale for how our figures are sourced.