Pistachio Butter

One US cup of pistachio butter weighs 256 grams. Going the other way, 100 grams is about 0.39 cups.

Also called pistachio nut butter, creamy pistachio butter, ground pistachios, pure pistachio butter.

TL;DR: 1 cup of pistachio butter weighs 256 grams. High confidence, based on six converging sources including USDA Branded Foods, two producer serving-size disclosures, and multiple generic nutrition databases.

Pistachio butter is ground roasted pistachios, sometimes with a pinch of salt and rarely with added oil, processed to a smooth or slightly coarse paste. It sits in the same commercial category as almond butter, cashew butter, and sunflower seed butter: a pure nut or seed butter with no significant sweetener, dairy, or emulsifier content. Sweetened pistachio spreads and pistachio creams (Italian crema al pistacchio and similar) are distinct products, typically containing sugar and sometimes milk powder or oil, and they pack differently.

The data converges tightly. USDA's Branded Foods database entry for a commercial pistachio butter (UPC 765857206769) lists 271 grams per metric cup, which the same database converts to 9 ounces per US cup, or approximately 256 grams. Nutty Gourmet and The Pistachio Factory both disclose 32-gram serving weights for two tablespoons, which extrapolates to 256 grams per US cup at 16 tablespoons per cup. Generic pistachio butter references at Nutriscan and Fitia give the same figure. This is the same convergence pattern seen for cashew butter (257 g/cup) and sunflower seed butter (257 g/cup), all three nut and seed butters landing within 1% of each other because they share similar bulk densities: dense ground solids with 50 to 65 percent fat by weight, minimal air incorporation, and no crystalline structure.

The density check supports the figure independently. USDA raw shelled pistachios weigh about 123 grams per US cup at 0.520 g/mL as whole nuts. Grinding to a smooth butter displaces air pockets and increases density to roughly 1.08 g/mL, a 2.08x increase. This matches the whole-to-butter density ratio observed with cashews and other tree nuts.

One branded outlier exists: Fiddyment Farms lists 28 grams for a 2-tablespoon serving, which would extrapolate to 224 g/cup, about 14 percent below the convergence. This appears to be a serving-size rounding rather than a genuine density difference; the calorie load (180 kcal for 28 g) is inconsistent with pistachio composition at that weight, so the serving size is likely the source of the discrepancy rather than the product. Not accepted as an independent data point.

King Arthur has no entry for pistachio butter. Their ingredient weight chart lists 'Pistachio Paste' at 78 g per quarter cup, which extrapolates to 312 g per cup, but this is a fundamentally different product. King Arthur's own recipe for pistachio paste combines 160 g of roasted pistachios with 74 g of granulated sugar and 57 to 85 g of water to make one generous cup, which is a patisserie-style sweetened paste analogous to almond paste, not a nut butter. The 312 g/cup figure is correct for that specific product but should not be substituted for pistachio butter in a recipe.

For baking, weigh pistachio butter rather than measuring by volume. Natural nut butters separate on standing, and cup measures taken from a well-stirred jar versus a settled jar can vary by 5 to 10 percent. Weighing eliminates the variance entirely.