Pantry Staples
Peanut Butter Conversion
Peanut Butter weighs 258g per US cup.
| Amount | Grams | Ounces |
|---|---|---|
| 1 cup | 258.0 g | 9.10 oz |
| 1/2 cup | 129.0 g | 4.55 oz |
| 1/4 cup | 64.5 g | 2.28 oz |
| 1 tbsp | 16.1 g | 0.57 oz |
| 1 tsp | 5.4 g | 0.19 oz |
| 100 g | 100.0 g | 3.53 oz |
Need a different amount? Use the full Ingredient Converter tool.
Peanut butter's 258g per cup makes it one of the heaviest common pantry ingredients on this site — heavier than oil (218g) despite being oil-based in large part, because peanut butter also contains ground peanut solids (protein and fiber) packed in alongside the oil, adding mass that pure oil doesn't have.
Natural peanut butter (just peanuts and salt, no added stabilizers) and conventional processed peanut butter (which includes emulsifiers like palm oil or hydrogenated oils to keep the texture smooth and prevent separation) can weigh slightly differently per cup depending on exact composition, though the difference is generally small enough that this figure works as a reliable conversion for either.
Peanut butter's thick, dense texture also affects how it measures practically: because it doesn't settle and level the way a dry powder does, gently packing it into a measuring cup (rather than leaving air gaps around a stiff scoop) gets a more accurate, consistent cup measurement — closer in spirit to how brown sugar is packed than how flour is spooned.
Peanut butter's dense 258g-per-cup weight comes from its high combined fat and protein content, denser than nearly any other spread this site converts — though the exact figure can shift slightly for an unstabilized style where oil has separated toward the top of the jar before it's stirred back in, a separation this site's dedicated peanut butter guide covers in more depth.
Crunchy and creamy peanut butter weigh essentially the same per cup despite the textural difference, since the added peanut pieces in crunchy varieties don't meaningfully change the overall density — the choice between them is purely a texture preference, not a conversion consideration.
Measuring it after lightly oiling the measuring cup makes it release more cleanly, a small trick worth knowing before scraping a sticky cup.
Some recipes call for it slightly warmed, which loosens its texture and makes it easier to swirl into a batter or sauce.
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Frequently asked questions
Does natural peanut butter weigh the same per cup as regular peanut butter?
Close enough for practical conversion purposes — the main difference between them is oil separation and shelf-stability, not a meaningfully different weight per equivalent cup once the natural version has been stirred back together.
Why does peanut butter weigh more per cup than vegetable oil, if it's mostly oil?
Oil alone has nothing solid floating in it, while a jar of peanut butter is packed with actual ground peanut material — real protein and fiber suspended in that oil — and solid matter simply weighs more per scoop than pure liquid fat does.
How should I measure peanut butter for the most accurate cup conversion?
Pack it gently into the measuring cup to eliminate air gaps, similar to how brown sugar is measured — peanut butter's thick, stiff texture means it doesn't self-level the way a free-flowing dry ingredient does.
Does crunchy peanut butter weigh the same per cup as smooth?
Very close — the peanut pieces in crunchy peanut butter don't meaningfully change the overall density, since they're suspended in the same oil-and-solids base as smooth peanut butter.
Does the conversion change for reduced-fat peanut butter?
Slightly — reduced-fat versions typically replace some fat with added starch or sugar, which can shift the weight per cup a bit from this site's standard peanut butter figure, though not dramatically.