How many ounces in a cup of flour?
1 cup = 4.23 oz
by weight · 120 g · spooned into the cup and leveled · by volume it is still 8 fl oz
5 lb bag ≈ 19 cups (spooned and leveled)
Converter
Other cup standards
US cups: 1 · nutrition-label cups (240 mL): 0.986 · metric cups (250 mL): 0.946 · UK fluid ounces: 8.33
A cup of flour is 8 fl oz of space, but it weighs far less than 8 oz. King Arthur Baking's ingredient weight chart puts 1 cup of all-purpose flour at 120 g, about 4.25 oz by weight, measured by spooning flour into the cup and leveling it with a knife. Bread flour is listed at the same 120 g per cup, and whole wheat flour at 113 g, about 4 oz.
How you fill the cup changes the answer. Dipping the cup into the bag and scooping packs in noticeably more flour, which can make cakes and cookies drier and denser than the recipe intended. A scale skips the problem: weigh 120 g per cup the recipe asks for.
For why ounces on a scale and fluid ounces differ, see dry vs. liquid ounces.
| Cups | Grams | Ounces (weight) |
|---|---|---|
| 1/4 cup | 30 g | 1.06 oz |
| 1/3 cup | 40 g | 1.41 oz |
| 1/2 cup | 60 g | 2.12 oz |
| 2/3 cup | 80 g | 2.82 oz |
| 3/4 cup | 90 g | 3.17 oz |
| 1 cup | 120 g | 4.23 oz |
| 1 1/2 cups | 180 g | 6.35 oz |
| 2 cups | 240 g | 8.47 oz |
| 3 cups | 360 g | 12.7 oz |
| 4 cups | 480 g | 16.93 oz |
| Ingredient | 1 cup | 1/2 cup | 1/3 cup | 1/4 cup | How measured |
|---|---|---|---|---|---|
| All-purpose flour | 120 g · 4.23 oz | 60 g · 2.12 oz | 40 g · 1.41 oz | 30 g · 1.06 oz | spooned into the cup and leveled |
| Bread flour | 120 g · 4.23 oz | 60 g · 2.12 oz | 40 g · 1.41 oz | 30 g · 1.06 oz | spooned and leveled |
| Whole wheat flour | 113 g · 3.99 oz | 57 g · 1.99 oz | 38 g · 1.33 oz | 28 g · 1 oz | spooned and leveled |
Source: King Arthur Baking — Ingredient Weight Chart (consulted 2026-10-28).
How many cups are in a 5 lb bag of flour?
A 5 lb bag holds 2,268 g. At 120 g per cup, that is about 19 cups of all-purpose or bread flour. Whole wheat flour, at 113 g per cup, gives about 20 cups. Scooping instead of spooning packs more into each cup, so you will get fewer cups from the bag.
Questions
How many ounces in a cup of flour?
About 4.25 oz by weight (120 g) for all-purpose flour, spooned and leveled. In volume, any cup is 8 fl oz.
5 lb bag of flour is how many cups?
About 19 cups of all-purpose flour, at 120 g per cup.
How many grams in 1 cup of flour?
120 g of all-purpose flour, per King Arthur Baking's chart. Half a cup is 60 g.
Does whole wheat flour weigh the same per cup?
It is a little lighter: 113 g, about 4 oz, per cup.
Sources: US customary units: NIST Handbook 44 · ingredient weights: King Arthur Baking ingredient weight chart. How we calculate.