How many grams are in 1 cup of Peanut butter?
One US cup (240 ml) of smooth peanut butter weighs about 258 grams. A US customary cup (236.6 ml) holds about 254 g, a metric cup (250 ml) about 269 g, and an imperial cup (284.1 ml) about 305 g.
Cups of Peanut butter to grams
One US cup (240 ml) of smooth peanut butter weighs about 258 grams (9.1 oz), measured packed.
Peanut butter is thick enough to bridge over air pockets as you fill a cup, which is why measured weights vary. USDA’s figure — 32 g per 2 tablespoons — scales to 258 g per US cup.
Ingredient
258 grams
US cup · smooth peanut butter · packed
More precise value: 258 grams
- Cup standard
- US cup · 240 ml
- Ingredient
- smooth peanut butter
- Method
- packed
- Density
- 1.075 g/ml
- Sources
- USDA FDC · King Arthur
- Reviewed
- 2026-08
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Peanut butter by cup standard
The same volume weighs more in a larger cup. These figures scale the reference weight of 258 g per 240 ml US cup by each cup standard’s exact volume.
| Cups | US cup | US customary cup | Metric cup | Imperial cup |
|---|---|---|---|---|
| ⅛ | 32 g | 32 g | 34 g | 38 g |
| ¼ | 65 g | 64 g | 67 g | 76 g |
| ⅓ | 86 g | 85 g | 90 g | 102 g |
| ½ | 129 g | 127 g | 134 g | 153 g |
| ⅔ | 172 g | 170 g | 179 g | 204 g |
| ¾ | 194 g | 191 g | 202 g | 229 g |
| 1 | 258 g | 254 g | 269 g | 305 g |
| 1½ | 387 g | 381 g | 403 g | 458 g |
| 2 | 516 g | 509 g | 538 g | 611 g |
smooth peanut butter, packed. Reviewed 2026-08.
Tablespoons and teaspoons
Spoon measures use the US definitions: 1 tablespoon = 14.79 ml (16 per cup) and 1 teaspoon = 4.93 ml (3 per tablespoon).
| Measure | Grams (g) | Ounces (oz) |
|---|---|---|
| 1 tsp | 5.3 | 0.19 |
| 1 tbsp | 15.9 | 0.56 |
| 2 tbsp | 31.8 | 1.12 |
| 4 tbsp (¼ cup) | 63.6 | 2.24 |
| 8 tbsp (½ cup) | 127.2 | 4.49 |
| 16 tbsp (1 cup) | 254.3 | 8.97 |
How to measure Peanut butter by volume
- Pack peanut butter into the cup in spoonfuls, pressing each addition down to expel air.
- Level the top, and scrape the cup out completely — a surprising amount stays behind.
- Stir natural-style peanut butter thoroughly first; separated oil skews the weight badly.
Why the weight varies
Peanut butter traps air pockets when spooned into a cup; natural stir-in-oil styles vary with how well they are stirred.
Peanut butter cookies have famously little structure beyond the peanut butter itself, so the 12 g-per-cup spread between published values genuinely shows. Weighing also avoids the messiest cup in baking.
Which value we publish, and why
We publish 258 g per US cup, USDA FoodData Central’s cup portion for smooth peanut butter; King Arthur lists 270 g.
Values you may see elsewhere
Sources: USDA FDC · King Arthur . Reference weight verified against USDA FDC, King Arthur. Reviewed 2026-08. Conversions are estimates — ingredient weight varies with packing and brand.
Frequently asked questions
How many grams is 1 tablespoon of Peanut butter?
One US tablespoon (14.79 ml) of smooth peanut butter weighs about 15.9 g, and one teaspoon (4.93 ml) about 5.3 g.
How many ounces is 1 cup of Peanut butter?
One US cup of smooth peanut butter weighs about 9.1 oz (258 g). Note these are weight ounces — for liquids, don’t confuse them with fluid ounces, which measure volume.