Oats to Cups
Oats weighs approximately 80 grams per US customary cup. Use the calculator below to convert any amount of oats between grams and cups.
About Oats
Oats (rolled oats) are whole-grain flakes used in porridge, granola and baking. One US cup weighs only about 80 grams because oats are light and fluffy.
Whether you are scaling a recipe up, substituting an ingredient, or converting a recipe from metric to US measurements, having an accurate grams-per-cup value for oats removes the guesswork from your cooking. Bookmark this page for quick reference whenever oats appears in a recipe.
How much does a cup of oats weigh?
A standard US cup of oats weighs about 80 grams (2.82 ounces). That makes it about 1.5 times lighter than a cup of all-purpose flour, and lighter than a cup of granulated sugar (200 g). This is why a converter that uses the same factor for every ingredient will give wrong answers: oats has its own density, and recipes depend on it.
Weight of common oats measures
| Measure | Grams | Ounces |
|---|---|---|
| 1 teaspoon of oats | 1.7 g | 0.06 oz |
| 1 tablespoon of oats | 5 g | 0.18 oz |
| 1/4 cup of oats | 20 g | 0.71 oz |
| 1/3 cup of oats | 26.7 g | 0.94 oz |
| 1/2 cup of oats | 40 g | 1.41 oz |
| 2/3 cup of oats | 53.3 g | 1.88 oz |
| 3/4 cup of oats | 60 g | 2.12 oz |
| 1 cup of oats | 80 g | 2.82 oz |
| 2 cups of oats | 160 g | 5.64 oz |
Values are reference weights for level, unpacked measures unless the ingredient is normally packed. Brand, moisture, temperature and how firmly you fill the cup can shift the result by a few percent, so for precision baking weigh oats on a kitchen scale and use the cup figure only as a guide. To understand why these numbers differ between ingredients, read our guide on why a cup of flour is not a cup of sugar, or see why weighing beats measuring cups.
Oats Conversion Table
| Grams | Cups | Ounces |
|---|---|---|
| 25 g | 0.31 cups | 0.88 oz |
| 50 g | 0.63 cups | 1.76 oz |
| 75 g | 0.94 cups | 2.65 oz |
| 100 g | 1.25 cups | 3.53 oz |
| 125 g | 1.56 cups | 4.41 oz |
| 150 g | 1.88 cups | 5.29 oz |
| 175 g | 2.19 cups | 6.17 oz |
| 200 g | 2.50 cups | 7.05 oz |
| 225 g | 2.81 cups | 7.94 oz |
| 250 g | 3.13 cups | 8.82 oz |
| 300 g | 3.75 cups | 10.58 oz |
| 400 g | 5.00 cups | 14.11 oz |
| 500 g | 6.25 cups | 17.64 oz |
Frequently Asked Questions
- help_outlineHow many cups is 100 grams of oats?
100 grams of oats is approximately 1.25 cups, based on the standard reference of 80 grams per US cup.
- help_outlineHow many grams is 1 cup of oats?
1 US cup of oats weighs approximately 80 grams. Always level off the cup for the most accurate result.
- help_outlineIs the oats cups conversion accurate for all brands?
The 80 g/cup value is a widely accepted average. Small variations can occur between brands and depending on how firmly the ingredient is packed.