| US cup amount | Weight |
|---|---|
| 1/8 cup | 32 g |
| 1/4 cup | 64 g |
| 1/3 cup | 85 g |
| 1/2 cup | 128 g |
| 3/4 cup | 192 g |
| 1 cup | 256 g |
| 1 1/2 cups | 384 g |
| 2 cups | 512 g |
Peanut Butter Grams to Cups
1 US cup of peanut butter weighs 256 grams. It is dense and sticky, which makes it one of the ingredients most worth weighing rather than measuring.
Use the converter and charts below for smooth peanut butter at room temperature.
Grams to Cups Converter
Choose the ingredient before converting because every ingredient has a different weight per cup.
Grams to Cups Converter
Results use the documented ingredient state and one US customary cup.
Divide the gram amount by 256 to calculate US cups. The practical fraction is a measuring aid, not a replacement for the exact gram weight.
| Grams | US cups | Practical reference |
|---|---|---|
| 25 g | 0.10 cups | about 1/8 cup |
| 30 g | 0.12 cups | about 1/8 cup |
| 40 g | 0.16 cups | about 1/8 cup |
| 50 g | 0.20 cups | about 1/4 cup |
| 60 g | 0.23 cups | about 1/4 cup |
| 75 g | 0.29 cups | about 1/4 cup |
| 80 g | 0.31 cups | about 1/3 cup |
| 100 g | 0.39 cups | about 1/3 cup |
| 120 g | 0.47 cups | about 1/2 cup |
| 125 g | 0.49 cups | about 1/2 cup |
| 150 g | 0.59 cups | about 2/3 cup |
| 200 g | 0.78 cups | about 3/4 cup |
| 250 g | 0.98 cups | about 1 cup |
| 300 g | 1.17 cups | about 1 1/8 cups |
| 400 g | 1.56 cups | about 1 1/2 cups |
| 500 g | 1.95 cups | about 2 cups |
Press it firmly into the cup to drive out air pockets, then level the top. Better still, weigh it straight into the mixing bowl and skip the cup you would otherwise have to scrape and wash.
Grams = cups × 256
One cup is 256 grams, one-half cup is about 128 grams and one-quarter cup is about 64 grams.
Common uses
- Oatmeal and overnight oats
- Granola
- Cookies and crumble toppings
This page uses smooth commercial peanut butter. Natural varieties that separate need stirring first, or the measurement is mostly oil or mostly solids.
| Type | Grams per US cup | What changes |
|---|---|---|
| Smooth peanut butter | 256 g | The reference on this page. |
| Crunchy peanut butter | 256 g | Peanut pieces do not change the weight per cup. |
| Natural peanut butter, stirred | 250 g | Slightly looser once mixed. |
| Almond butter | 256 g | Effectively interchangeable by weight. |
| Tahini | 240 g | Thinner, so a little lighter per cup. |
Unstirred natural peanut butter is the real trap. Measure from the top and you get mostly oil; measure from the bottom and you get a paste the recipe cannot use.
Comparison figures are typical published US baking references. Only the smooth peanut butter value above is part of this site's sourced dataset.
Natural peanut butter that separates should be stirred before measuring. The value on this page names the exact product state it applies to, so you can check it against your own ingredient rather than trusting a bare number.
The converter does not assume that every cup weighs 237 or 250 grams. It uses the documented value for the exact ingredient and state selected.
If a product label or recipe publisher supplies a different gram weight for one cup, follow that recipe-specific value for the closest match to the original testing.
Method and source
How this conversion was checked
This page uses 256 grams per US cup for smooth peanut butter at room temperature. Natural peanut butter that separates should be stirred before measuring.
Primary reference: King Arthur Baking Ingredient Weight Chart
Cup standard: NIST US customary cup reference
How many grams are in one cup of peanut butter?
One US cup of smooth peanut butter at room temperature weighs 256 grams.
How many cups is 100 grams of peanut butter?
100 grams of peanut butter is 0.39 US cups.
How many grams is half a cup of peanut butter?
Half a US cup is about 128 grams using the 256 gram full-cup reference.
How many grams is a tablespoon of peanut butter?
About 16 grams, pressed in and levelled.
Should I pack peanut butter into the cup?
Yes. Press it in to remove air pockets, or the cup holds noticeably less than the 256 gram reference.
Are these US cups or metric cups?
The results use a US customary cup of 236.588 millilitres. A metric cup is 250 millilitres and gives a different answer.
Other Ingredient Guides
Each guide uses its own grams-per-cup standard.