Home / Conversions /Peanut Butter
Peanut butter:
grams to cups.
Peanut butter weighs 258 g per cup — one of the denser spreadable foods because it combines ground peanut solids and peanut oil with very few air gaps. Natural peanut butter that has separated (oil on top) will measure differently until it is stirred thoroughly.
Peanut Butter: grams to cups
Approximate cup fractions for common gram amounts. Based on 258 g per cup.
| Grams | Cups (approx) | Decimal |
|---|---|---|
| 25 g | ⅙ | 0.10 |
| 50 g | ⅙ | 0.19 |
| 100 g | ½ | 0.39 |
| 150 g | ⅔ | 0.58 |
| 200 g | ¾ | 0.78 |
| 250 g | 1 | 0.97 |
| 500 g | 1 1 | 1.94 |
Peanut Butter: cups to grams
Based on 258 g per cup.
| Volume | Grams (g) |
|---|---|
| 1 cup | 258 g |
| ¾ cup | 194 g |
| ½ cup | 129 g |
| ⅓ cup | 86 g |
| ¼ cup | 65 g |
| 1 tbsp | 16 g |
| 1 tsp | 5 g |
Convert peanut butter instantly
Oil separation in natural peanut butter and its effect on measurement
Natural peanut butter (made from just peanuts, possibly with salt) separates as the peanut oil rises to the top over time. An unstirred jar with a thick layer of oil on top and a dense, dry paste below will not measure consistently — a cup scooped from the dense bottom paste will weigh more than a cup scooped from the oily top. Homogenized commercial peanut butter (with stabilizers like palm oil to prevent separation) is more consistent cup-to-cup. The 258 g/cup figure assumes well-stirred, fully homogenized peanut butter. Always stir natural peanut butter completely before measuring, or better yet, weigh it directly.
Peanut butter in cookies: the fat-to-flour ratio problem
Classic peanut butter cookies are sometimes made with no flour at all — just peanut butter, sugar, and egg. In these recipes, peanut butter provides all the fat and most of the structure. The quantity of peanut butter directly controls the fat content, which affects spread, chew, and richness. At 258 g per cup, peanut butter is about 50% fat. A peanut butter cookie recipe calling for 1 cup of peanut butter is using 129 g of fat plus 129 g of protein-and-carbohydrate solids. Getting the cup measurement right — or just using 258 g on a scale — determines whether your cookies spread correctly or stay firm and crumbly.
Frequently asked questions
- How many grams is ½ cup of peanut butter?
- ½ cup of peanut butter weighs 129 g (258 g ÷ 2).
- How many grams is 2 tablespoons of peanut butter?
- 2 tablespoons of peanut butter (⅛ cup) weigh about 32 g (258 g ÷ 8).
- How many cups is 500 g of peanut butter?
- 500 g ÷ 258 g/cup ≈ 1.94 cups — just under 2 cups.
Related guides
Convert your full recipe — not just peanut butter
Paste your entire ingredient list into Recipe Converter Pro and every cup, tablespoon, and gram converts instantly — including peanut butter, flour, sugar, butter, and more.