How many cups is 258 grams of peanut butter?

About 1 cup. A cup of peanut butter weighs approximately 258 grams, which is roughly 9.1 ounces.

How many cups is 100 grams of peanut butter?

About 0.39 cups, using the 258 g/cup density figure.

Is 258 grams per cup an exact figure?

No, it is an approximation. Brand, whether the peanut butter is smooth or crunchy, and how tightly it is packed into the cup all affect the actual weight. For baking where precision matters, weigh the peanut butter on a kitchen scale instead of relying on a cup measure.

Does crunchy peanut butter weigh the same as smooth per cup?

They are close, but crunchy peanut butter contains peanut pieces that can leave small air gaps in a packed cup, so the weight can vary slightly from smooth. The 258 g/cup figure is a standard reference suitable for most recipes.

Is this the same conversion as whole peanuts?

No. Shelled peanuts use a different density (about 146 g/cup) because whole nuts pack with air gaps, while peanut butter is a dense paste. Use this tool for peanut butter and a separate peanuts converter for whole or shelled peanuts.

Is this a US cup or a metric cup?

This tool uses the US cup (236.6 ml). A metric cup (250 ml) would give a slightly lower cup result for the same gram weight.

Peanut Butter Grams to Cups

Enter a weight in grams of peanut butter to get the amount in cups and ounces.

Peanut Butter Converter

Amount in Grams

Result

1 cup

≈ 9.1 oz

Quick Reference Table

Grams	Cups	Ounces

Values are measured by US cup (236.6 ml) using a density of 258 grams per cup of peanut butter. This is an approximation: brand, smooth vs. crunchy texture, and how tightly the peanut butter is packed into the cup all shift the real weight.

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Summary

Peanut butter is a common ingredient in baking, smoothies, and sauces, and recipes list it in grams almost as often as cups. This tool converts any gram weight to cups and ounces using a density of 258 grams per cup, the same figure used by the cups-to-grams version of this converter, and includes a reference table for common weights so you do not need to run the math yourself.

How it works

Enter the weight in grams of peanut butter you want to convert.
The cup amount updates instantly based on a fixed density of 258 g per cup.
The ounce equivalent is shown alongside the cup result.
Use the reference table for common gram amounts without typing a value.

Use cases

Convert a gram amount from a kitchen scale back into cups for a recipe written in US measurements.
Check how many cups a jar label listing grams actually holds.
Convert a metric recipe to US cup measurements for baking or cooking.
Portion out peanut butter by cup size after weighing a bulk amount.
Match a nutrition label gram serving to a cup-based recipe instruction.

Frequently Asked Questions

Last updated: 2026-09-09 · Reviewed by Nham Vu