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Cooking conversion
Cups of Peanut Butter to Grams
How many grams 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.
Calculator
1 cup of peanut butter = 256.22 g
Cups of Peanut Butter to Grams Conversion Table
Common values for peanut butter:
| Cups of peanut butter | Grams |
|---|---|
| 0.25 cup | 64.0562 g |
| 0.5 cup | 128.11 g |
| 1 cup | 256.22 g |
| 2 cup | 512.45 g |
| 3 cup | 768.67 g |
| 4 cup | 1024.9 g |
| 5 cup | 1281.12 g |
| 8 cup | 2049.8 g |
| 10 cup | 2562.25 g |
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.
Grams = cups × 256.2248
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 (1.083 g/mL) 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.
Sourced from USDA: 1 cup = 256g. Smooth, full-fat.
Volume vs weight in cooking
The American convention of measuring ingredients by volume (cups, tablespoons, teaspoons) is convenient but introduces variability that doesn't exist in weight-based recipes. Most professional bakers and bakeries weigh ingredients to within a gram because the structure of baked goods depends on precise ingredient ratios. For everyday cooking — soups, sauces, sautés — the volume-to-weight imprecision rarely matters. For baking that depends on rising or texture (cakes, breads, laminated doughs), it matters a lot.
The conversion
Multiplying the volume of peanut butter by its density (1.083 g/mL) gives the weight in grams. The calculator at the top of this page does the math automatically; the formula box above shows the resulting linear factor for the specific volume and weight units selected here.