Ingredient Weight Converter · nut
Peanut Butter: cups to grams
1 cup of peanut butter weighs 258 grams. Use the converter below for any other amount, or check the quick-reference table.
By Andrew Flores, Editor and publisher, Nathan Management. Last reviewed .
Density source: USDA FoodData Central, cross-checked against the King Arthur Baking weight chart. How these figures are derived and corrected is documented in our editorial standards.
Peanut Butter baseline: 1 cup = 258 g.
Common amounts
| Cups | Tablespoons | Grams | Ounces (weight) | Milliliters |
|---|---|---|---|---|
| 1/4 cup | 4.0 | 65 g | 2.28 oz | 59 mL |
| 1/3 cup | 5.3 | 86 g | 3.03 oz | 79 mL |
| 1/2 cup | 8.0 | 129 g | 4.55 oz | 118 mL |
| 2/3 cup | 10.7 | 172 g | 6.07 oz | 158 mL |
| 3/4 cup | 12.0 | 194 g | 6.83 oz | 177 mL |
| 1 cup | 16.0 | 258 g | 9.10 oz | 237 mL |
| 1.5 cups | 24.0 | 387 g | 13.65 oz | 355 mL |
| 2 cups | 32.0 | 516 g | 18.20 oz | 473 mL |
| 3 cups | 48.0 | 774 g | 27.30 oz | 710 mL |
| 4 cups | 64.0 | 1032 g | 36.40 oz | 946 mL |
Spoon weights
Derived from the same 258 g per cup — a US tablespoon is 1/16 of a cup and a teaspoon is 1/48.
| Amount | Grams |
|---|---|
| 1 tablespoon | 16 g |
| 1 teaspoon | 5.4 g |
| 1/2 teaspoon | 2.7 g |
| 1/4 teaspoon | 1.3 g |
Peanut Butter at a glance
- Commercial vs. natural
- Commercial adds hydrogenated oil, sugar, and salt for stability; natural is peanuts and maybe salt
- 16 oz jar
- about 1 3/4 cups (454 g ÷ 258 g)
- Measuring trick
- Water displacement: fill a 2-cup measure with 1 cup water, spoon peanut butter in to the 2-cup line, pour off the water
What a cup of peanut butter actually weighs
The published 258 g assumes one specific way of filling the cup. Here is what the same cup weighs under the other common handling methods and product forms, and how far off the recipe you end up.
| How it was measured | Grams per cup | vs. published | Why |
|---|---|---|---|
| Commercial creamy, packed into a cup | 258 g | published figure | The published figure. Press it in with a spatula — air pockets are the main measuring error here. |
| Natural, stirred | ~240 g | -7% | No added hydrogenated oil, and stirring works air in. Lighter per cup and much runnier. |
| Crunchy | ~250 g | -3% | The peanut pieces hold air pockets that the smooth version does not. |
A tilde (~) marks a working estimate rather than a published figure — it varies with brand, grind, or how hard the cup was packed.
Why measuring peanut butter by cup goes wrong
Commercial creamy peanut butter (Skippy, Jif) weighs about 258 grams per cup. Natural peanut butter that separates is closer to 240 g/cup after stirring because it contains no added hydrogenated oil or sugar and traps more air when you stir it back together. The difference matters in peanut butter cookies — natural peanut butter spreads less and leaves a sandier crumb.
Practical tips for working with peanut butter
For peanut butter cookies that hold their shape with a clean fork-ridge pattern, use commercial creamy peanut butter. For sauces and dressings (Thai peanut sauce, salad dressings), natural peanut butter has the better flavor and the better texture once thinned. Refrigerate natural peanut butter after stirring it the first time — it is the only reliable way to keep the oil and solids combined.
Note from this ingredient's record: Creamy, no-stir varieties. Natural peanut butter that separates is closer to 240 g/cup once stirred and can change a cookie's spread.
Substitutions that work — and what they cost you
Natural for commercial in cookies
Ratio: 1:1 by weight
Trade-off: Drier and sandier, with less spread. Add a tablespoon of oil or an extra egg yolk if the dough crumbles.
Almond or sunflower seed butter
Ratio: 1:1
Trade-off: Works in most recipes. Sunflower butter can turn baked goods green — its chlorogenic acid reacts with baking soda. Harmless, alarming to look at.
When peanut butter ruins the recipe
| What you see | What went wrong | What to do |
|---|---|---|
| Peanut butter cookies came out dry and crumbly | Natural peanut butter substituted straight into a recipe written for commercial, or the jar was measured after the oil had been poured off. | Stir the oil back in before measuring, weigh rather than scoop, and add a yolk if the dough will not hold together. |
| The oil has separated into a hard-packed jar | Normal for natural peanut butter — nothing is emulsifying it. | Store the jar upside down between uses, stir hard the first time, then refrigerate. |
Storing peanut butter
Commercial peanut butter is shelf-stable for months. Natural peanut butter goes rancid at room temperature in a few weeks once opened — refrigerate it, and accept that it will be stiff.
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