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. 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

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 our Desiccated Coconut converter.

No scale? No worries. The tool below gives a good estimate, but for exact bakes a digital kitchen scale is worth it.

Rolled Oats Measurement Converter

Enter a value and pick your units.

Result

0 Cup (US)

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)cupgramstbsptsp
2.5 oz0.82 cup (US)0.79 cup70.98 g13.14 tbsp39.43 tsp
5 oz1.64 cup (US)1.58 cup141.96 g26.29 tbsp78.86 tsp
7.5 oz2.46 cup (US)2.37 cup212.93 g39.43 tbsp118.3 tsp
10 oz3.29 cup (US)3.15 cup283.91 g52.58 tbsp157.73 tsp

Frequently Asked Questions

How many US cups is 1 ounce of rolled oats?
1 ounce of rolled oats is 0.33 US cups. The ratio is fixed, so 2 ounces of rolled oats is 0.66 US cups and 0.5 ounces is 0.16 US cups. Use the converter above for any quantity, or check the conversion chart on this page for the most common amounts at a glance. Open the rolled oats converter
How many US cups is 1.5 ounces of rolled oats?
1.5 ounces of rolled oats is 0.49 US cups. The ratio is fixed, so 1 ounce of rolled oats is 0.33 US cups and 2 ounces is 0.66 US cups. Type any other amount into the converter above for the exact figure, or use the chart below for the common ones.
How many US cups is 2 ounces of rolled oats?
2 ounces of rolled oats is 0.66 US cups. Conversions scale in a straight line, so halving or doubling a recipe keeps the same ratio. 1 ounce of rolled oats is 0.33 US cups, and you can multiply or divide that figure to match whatever your recipe needs. Enter any amount in the converter above for an exact US cups reading.
How many ounces of rolled oats is 0.33 US cups?
0.33 US cups of rolled oats is 1 ounce. The conversion works the same in reverse, so you can switch between US cups and ounces without changing the result. This helps when a recipe lists ounces but you would rather weigh or measure in US cups. The converter above and the chart below cover both directions for any amount.
How many US cups is 1 ounce of oatmeal?
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.

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