One US cup of peanut butter weighs about 258 grams. That single number is what makes this conversion possible, and it is why baking by weight is more reliable than baking by volume.
Assumes smooth and at room temperature. Volume measures depend on how the ingredient is packed into the cup, while a gram is a gram no matter how you scoop it.
Enter your amount above to convert it. The table below covers the fractions recipes actually call for, including thirds and eighths of a cup.
Below the calculator sits the peanut Butter cup to gram table: 11 rows — 0.125 cups at one end, 4 cups at the other — which is usually faster than entering a value you have seen before. The page opens with cups of peanut butter already set to 1 cups, so there is a finished result on screen before anything is typed. There are 3 named quantities in the formula (cups, 258, grams), each defined above with the unit it is measured in. Most visitors arrive here from, or leave for, Peanut Butter: Grams to Cups Converter and Kosher Salt: Grams to Cups Converter.
The formula
cups- Volume of peanut butter in US cups
258- Grams in one US cup of peanut butter
grams- Weight of the ingredient
How it works, step by step
- Enter your quantity of peanut butter.
- The tool applies the density of 258 g per US cup.
- The converted figure appears immediately, along with an ounce equivalent.
- Use the table for common recipe fractions without typing anything.
Worked examples
A standard single batch
A recipe calling for 2 cups of peanut butter needs 516 g. Weighing it removes the guesswork of how firmly to pack the cup.
Scaling a recipe by half
Half a cup of peanut butter is 129 g — easier to hit accurately on a scale than to eyeball in a measuring cup.
Checking the 0.75 cups row
The reference table lists Cups = 0.75 cups, giving Grams: 194 g, Ounces: 6.8 oz. Entering that above should reproduce the same figures — if it does not, the input is being read differently to the way the table assumes.
Frequently asked questions
How many grams are in a cup of peanut butter?
About 258 grams for a US cup. Assumes smooth and at room temperature.
How many grams are in a tablespoon of peanut butter?
A US tablespoon is one sixteenth of a cup, so about 16.1 grams.
Why do different sources give different gram values?
Because volume measuring is genuinely imprecise. How you fill the cup changes the weight, sometimes by 20% or more for flours and powders. Published values assume a specific method — usually spooned and levelled — and this page uses that convention.
Should I bake by weight or volume?
By weight whenever a scale is available. It is more repeatable, faster with fewer dishes, and it is the reason professional recipes are written in grams.
How precise is the weight in grams?
Internally the maths runs at full double precision and the display keeps the significant figures that carry information, dropping the digits that are only rounding noise. Rounding happens at the display step alone, so nothing accumulates error as you change the input. The figure is reported in g.
What formula does the Peanut Butter: Cups to Grams Converter use?
It computes grams = cups × 258, where cups is volume of peanut butter in US cups; 258 is grams in one US cup of peanut butter; grams is weight of the ingredient. The same expression is printed on the page above the inputs, so the result can be reproduced by hand or in a spreadsheet.
Peanut Butter conversion table
| Cups | Grams | Ounces |
|---|---|---|
| 0.125 cups | 32 g | 1.1 oz |
| 0.25 cups | 64 g | 2.3 oz |
| 0.333 cups | 86 g | 3.0 oz |
| 0.5 cups | 129 g | 4.6 oz |
| 0.667 cups | 172 g | 6.1 oz |
| 0.75 cups | 194 g | 6.8 oz |
| 1 cup | 258 g | 9.1 oz |
| 1.5 cups | 387 g | 13.7 oz |
| 2 cups | 516 g | 18.2 oz |
| 3 cups | 774 g | 27.3 oz |
| 4 cups | 1032 g | 36.4 oz |
Based on 1 US cup of peanut butter = 258 g. Assumes smooth and at room temperature.