Convert Rolled Oats from Ounces to Cup (US)

How many US cups is 1 ounce of rolled oats?

1 ounce of rolled oats (oatmeal) is 0.33 US cups. 2 ounces of rolled oats is 0.66 US cups. 4 ounces of rolled oats is 1.31 US cups. 6 ounces of rolled oats is 1.97 US cups. Use the converter below for any amount.

Rolled oats are whole oat groats that have been steamed and flattened into flakes (quicker to prepare than steel-cut oats, which are coarsely chopped and take 20–30 minutes to cook) and chewier in texture than quick oats (which are rolled thinner for a 1–2 minute cook time). One metric cup (250 ml) of rolled oats weighs approximately 90 grams or 3.17 ounces. They are widely used in porridge, granola, baked goods such as oat cookies and crumbles, and as a breadcrumb substitute.

Oats are often sold by weight but measured by volume in baking recipes — getting the conversion right prevents dense or dry results. Measuring by weight is especially important as oats compress easily, making cup measures inconsistent.

Also known as

  • oatmeal
  • porridge oats
  • old-fashioned oats

Related Rolled Oats Ingredients

Desiccated coconut works alongside oats in granola, flapjacks, and crumble toppings, adding sweetness and a fine crunch where oats give chew. They are close in weight (88 g vs 90 g per cup), so weigh rather than scoop when the ratio matters. See what 1 ounce of desiccated coconut is in US cups.

Oat flour is rolled oats milled to a fine powder, close in weight (100 g vs 90 g per cup). Blend rolled oats to make your own oat flour, or weigh the oats when a recipe gives one form but you have the other. See what 1 ounce of oat flour is in US cups.

Oat milk is made by blending rolled oats with water and straining the solids. Soak and blend the oats for a homemade carton, and weigh the oats when scaling the batch. See what 1 ounce of oat milk is in US cups.

No scale? The tool below gives a good estimate, but for exact bakes a digital kitchen scale removes the guesswork.

Weigh it exact, get a scale

Rolled Oats Measurement Converter

Enter a value and pick your units.

Result

0.33 Cup (US)

Rolled Oats Calculators & Baking Tools

Working with rolled oats? These tools handle the jobs a converter cannot.

Common Rolled Oats Conversions

Here are the most common rolled oats conversions from ounces to cups (US).

OuncesCups (US)
1 oz0.33 cups (US)
2 oz0.66 cups (US)
3 oz0.99 cups (US)
4 oz1.31 cups (US)
5 oz1.64 cups (US)
6 oz1.97 cups (US)
8 oz2.63 cups (US)
10 oz3.29 cups (US)
12 oz3.94 cups (US)

Rolled Oats Conversion Chart

The conversion chart below gives a quick reference for converting rolled oats from Ounces to Cup (US) and other measurements.

ouncescup(US)cupgramslbkgtbsptsp
2.5 oz0.82 cup (US)0.79 cup70.98 g0.16 lb0.07 kg13.14 tbsp39.43 tsp
5 oz1.64 cup (US)1.58 cup141.96 g0.31 lb0.14 kg26.29 tbsp78.86 tsp
7.5 oz2.46 cup (US)2.37 cup212.93 g0.47 lb0.21 kg39.43 tbsp118.3 tsp
10 oz3.29 cup (US)3.15 cup283.91 g0.63 lb0.28 kg52.58 tbsp157.73 tsp

For the reverse conversion, see 1 US cup of rolled oats in ounces.

Frequently Asked Questions

How many US cups is 1 ounce of rolled oats?
1 ounce of rolled oats is 0.33 US cups. The conversion is fixed, so 2 ounces is 0.66 US cups and 4 ounces is 1.31 US cups. These whole-ounce amounts are the ones recipes call for most with bulk ingredients, and the figure scales in a straight line as you multiply or divide. Use the converter above for any other amount, or the conversion chart on this page for the common ones. Open the rolled oats converter
How many US cups is 2 ounces of rolled oats?
2 ounces of rolled oats is 0.66 US cups. The conversion is fixed, so 1 ounce is 0.33 US cups and 4 ounces is 1.31 US cups. These whole-ounce amounts are the ones recipes call for most with bulk ingredients, and the figure scales in a straight line as you multiply or divide. Use the converter above for any other amount, or the conversion chart on this page for the common ones.
What is 4 oz rolled oats in US cups?
4 ounces of rolled oats is 1.31 US cups. The conversion is fixed, so 1 ounce is 0.33 US cups and 2 ounces is 0.66 US cups. These whole-ounce amounts are the ones recipes call for most with bulk ingredients, and the figure scales in a straight line as you multiply or divide. Use the converter above for any other amount, or the conversion chart on this page for the common ones.
What is 6 oz rolled oats in US cups?
6 ounces of rolled oats is 1.97 US cups. The conversion is fixed, so 1 ounce is 0.33 US cups and 2 ounces is 0.66 US cups. These whole-ounce amounts are the ones recipes call for most with bulk ingredients, and the figure scales in a straight line as you multiply or divide. Use the converter above for any other amount, or the conversion chart on this page for the common ones.
How much is 1 ounce of oatmeal in US cups?
Oatmeal is another name for rolled oats, so 1 ounce of oatmeal is 0.33 US cups, exactly the same as rolled oats. The figure does not change with the name: 2 ounces is 0.66 US cups and 0.5 ounces is 0.16 US cups. Use the converter above for any quantity, or read the conversion chart on this page for the most common amounts.
Are rolled oats and oatmeal the same thing?
Yes. Oatmeal is another name for rolled oats, so they are the same ingredient and convert identically. 1 ounce of rolled oats is 0.33 US cups under either name, and 2 ounces is 0.66 US cups. Recipes use the two names interchangeably, so you can follow either one without changing quantities or weighing any differently.

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