Oats Grams to Cups
1 cup of old-fashioned rolled oats weighs about 89 grams. A typical ½ cup serving is about 45 g, and 100 g is 1 cup + 2 tablespoons.
Tip: This is for old-fashioned rolled oats. Thick-cut and quick oats weigh a little differently.
One US cup of old-fashioned rolled oats weighs about 89 g (King Arthur Baking). To convert grams of oats to cups, divide by 89, so 45 g = ½ cup. Oats are light and airy, so 100 g of oats fills more than a cup. Steel-cut oats are much denser and weigh more per cup.
Oats grams to cups chart
| Grams | Cups | Measure with | Tbsp |
|---|---|---|---|
| 10 g | about 2 tbsp | 2 tbsp | 1.8 |
| 25 g | ¼ cup + 1.5 tsp | ¼ cup + 1.5 tsp | 4.5 |
| 50 g | ½ cup + 1 tbsp | ½ cup + 1 tbsp | 9 |
| 75 g | ¾ cup + 1.5 tbsp | ½ cup + ⅓ cup | 13.5 |
| 100 g | 1 cup + 2 tbsp | 1 cup + 2 tbsp | 18 |
| 113 g | 1 ¼ cups + 1 tsp | 1 cup + ¼ cup + 1 tsp | 20.3 |
| 125 g | 1 ⅓ cups + 1 tbsp | 1 cup + ⅓ cup + 1 tbsp | 22.5 |
| 150 g | 1 ⅔ cups + 1 tsp | 1 cup + 2 × ⅓ cup + 1 tsp | 27 |
| 200 g | 2 ¼ cups | 2 × 1 cup + ¼ cup | 36 |
| 250 g | 2 ¾ cups + 1 tbsp | 2 × 1 cup + ½ cup + ¼ cup + 1 tbsp | 44.9 |
| 300 g | 3 ⅓ cups + 2 tsp | 3 × 1 cup + ⅓ cup + 2 tsp | 53.9 |
| 400 g | 4 ½ cups | 4 × 1 cup + ½ cup | 71.9 |
| 500 g | 5 ½ cups + 2 tbsp | 5 × 1 cup + ⅓ cup + ¼ cup + 1.5 tsp | 89.9 |
| 1000 g | 11 ¼ cups | 11 × 1 cup + ¼ cup | 179.8 |
Cups of rolled oats to grams
Rolled, quick and steel-cut oats
| Type | What it is | Per cup |
|---|---|---|
| Old-fashioned rolled oats | Whole oat groats steamed and flattened | 89 g |
| Quick oats | Rolled thinner and cut smaller | about the same by cup |
| Thick-cut rolled oats | Flattened less | a little heavier |
| Steel-cut oats | Groats chopped, not flattened | much heavier |
The converter and charts on this page use 89 g per cup for old-fashioned rolled oats.
Common amounts
| Oats | Grams |
|---|---|
| ¼ cup | 22 g |
| ⅓ cup | 30 g |
| ½ cup (one serving) | 45 g |
| ¾ cup | 67 g |
| 1 cup | 89 g |
| 2 cups | 178 g |
| 3 cups (a batch of oatmeal cookies) | 267 g |
Measuring oats
Scoop the oats into a dry measuring cup and level the top without pressing. Oats don’t pack much, so the result is fairly consistent. For oatmeal, a common ratio is ½ cup (45 g) of rolled oats to 1 cup of water or milk.
Questions
How many grams is 1 cup of oats?
About 89 g for old-fashioned rolled oats. King Arthur Baking lists the same 89 g for old-fashioned and quick oats; its own thicker rolled oats weigh more.
How many grams is ½ cup of oats?
About 45 g. That's the serving size on most oatmeal packages.
How many cups is 100 grams of oats?
100 g of rolled oats is 1 cup + 2 tablespoons.
How many cups is 50 grams of oats?
50 g of rolled oats is ½ cup + 1 tablespoon.
Are steel-cut oats the same weight per cup?
No. Steel-cut oats are chopped grains rather than flattened flakes, so they pack much more tightly and a cup weighs a lot more. Weigh them or follow the package.