How Much Is 3.91 Cups of All-Purpose Flour in Ounces?
3.91 cups of all-purpose flour equals 17.26 oz. All-purpose flour has a density of 125.16g per cup (125.16g per cup), which means it's relatively light compared to other common cooking ingredients. For comparison, 3.91 cups of honey would be 46.89 oz.
Formula and Step-by-Step
- Start with 3.91 cups of all-purpose flour
- 1 cup of all-purpose flour = 125.16g
- 3.91 × 125.16 = 489.38g
- Convert grams to ounces: 489.38 ÷ 28.3495 = 17.26 oz
The same formula works for any amount. Multiply (or divide) by the density, then convert units as needed.
Measuring Tip
Different flour types have very different weights per cup. Always check the specific flour your recipe calls for rather than using a generic "flour" conversion.
All-Purpose Flour at Different Amounts
How all-purpose flour scales across common cups measurements. Your amount (3.91 cups) is highlighted.
For reference, 3.91 cups of all-purpose flour (489.38g) is close in weight to a bottle of water (500 ml) (510g).
Other Amounts of All-Purpose Flour
| Cups | US Ounces | Metric Cup | Imperial Cup |
|---|---|---|---|
| 0.25 cups | 1.10 oz | 1.17 oz | 1.33 oz |
| 0.33 cups | 1.46 oz | 1.54 oz | 1.75 oz |
| 0.5 cups | 2.21 oz | 2.33 oz | 2.65 oz |
| 0.75 cups | 3.31 oz | 3.50 oz | 3.98 oz |
| 1 cup | 4.41 oz | 4.67 oz | 5.30 oz |
| 1.5 cups | 6.62 oz | 7.00 oz | 7.95 oz |
| 2 cups | 8.83 oz | 9.33 oz | 10.60 oz |
| 3 cups | 13.24 oz | 14.00 oz | 15.91 oz |
| 3.91 cups | 17.26 oz | 18.24 oz | 20.73 oz |
| 4 cups | 17.66 oz | 18.66 oz | 21.21 oz |
| 5 cups | 22.07 oz | 23.33 oz | 26.51 oz |
Understanding the Units
What is a Cup?
A cup is a US customary unit of volume equal to 236.588 milliliters or 8 fluid ounces. It is the most common volume measurement in American recipes. One cup can be divided into 16 tablespoons or 48 teaspoons.
What is an Ounce?
Weight ounces and fluid ounces are different measurements. A fluid ounce measures volume (29.574 ml), while an ounce measures weight (28.35g). They only align for water, where 1 fl oz weighs approximately 1 oz.