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Cooking conversion
Cups of Peanut Butter to Ounces
How many ounces are in cups of peanut butter? Type a value below to see the result instantly. Cooking conversions depend on the density of each ingredient — the math here uses 1.083 g/mL for peanut butter.
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1 cup of peanut butter = 9.0381 oz
Cups of Peanut Butter to Ounces Conversion Table
Common values for peanut butter:
| Cups of peanut butter | Ounces |
|---|---|
| 0.25 cup | 2.2595 oz |
| 0.5 cup | 4.519 oz |
| 1 cup | 9.0381 oz |
| 2 cup | 18.0761 oz |
| 3 cup | 27.1142 oz |
| 4 cup | 36.1523 oz |
| 5 cup | 45.1903 oz |
| 8 cup | 72.3045 oz |
| 10 cup | 90.3806 oz |
How this works
Peanut butter has a density of about 1.083 g/mL (usda: 1 cup = 256g). That means 1 mL of peanut butter weighs 1.083 grams.
Ounces = cups × 9.0381
Note: Smooth, full-fat.
Why a cup of peanut butter doesn't always weigh the same
Volume measurements are forgiving in some ways and brutal in others. A cup of peanut butter can vary by 10-20% in weight depending on how it's measured: spooned vs scooped, packed vs loose, sifted vs unsifted. The density figure used here matches the most common published recipe conventions, but if you're after baking precision, weighing on a kitchen scale is more accurate than measuring by volume.