How many cups is 100 g of rolled oats?

100 g of rolled oats is about 1.02 cups.

Why isn't 100 g exactly 1 cup?

Because rolled oats isn't the same density as water. A cup holds a fixed volume, and rolled oats weighs more or less than water for that volume.

Grams of rolled oats to cups

Answer

100 g of rolled oats = 1.02 cups

Convert any amount

Amount gram = – cup

Conversion table

Grams	Cups
10 g	0.1 cup
25 g	0.25 cup
50 g	0.51 cup
100 g	1.02 cup
150 g	1.52 cup
200 g	2.03 cup
250 g	2.54 cup
300 g	3.05 cup
500 g	5.08 cup

Based on the US customary cup of 240 ml. A metric cup (250 ml) is about 4% larger.

Handy tools for this

Digital kitchen scale The most accurate way to bake — skip the cup guesswork and weigh straight into the bowl to the nearest gram. Check price → Measuring cups set A sturdy nested set of US cups for recipes written in cups. Cheap, dishwasher-safe and built to last. Check price → Measuring spoons Tablespoon and teaspoon set for small, precise amounts of baking powder, salt and spices. Check price →

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How to measure

Rolled oats are light and airy, so a cup weighs much less than a cup of flour. Don't press them down when measuring.

Frequently asked questions

How many cups is 100 g of rolled oats?: 100 g of rolled oats is about 1.02 cups.
Why isn't 100 g exactly 1 cup?: Because rolled oats isn't the same density as water. A cup holds a fixed volume, and rolled oats weighs more or less than water for that volume.

Related conversions

Values are approximate — ingredient density varies with brand, humidity and how you measure. For baking, weighing on a scale is always the most reliable method.