How Many Grams in a Cup of Rolled Oats (Old-Fashioned)?
A cup of rolled oats (old-fashioned) weighs about 90 grams. Here is the complete cup-to-gram and gram-to-cup conversion table, plus the answer to common volume-to-weight questions for rolled oats (old-fashioned).
Volume to Grams — Rolled Oats (Old-Fashioned)
Quick reference for the most common amounts. Numbers rounded to the nearest gram.
| Cups | Grams |
|---|---|
| 1/4 cup | 22.5 g |
| 1/3 cup | 30 g |
| 1/2 cup | 45 g |
| 2/3 cup | 60 g |
| 3/4 cup | 67.5 g |
| 1 cup | 90 g |
| 1 1/2 cups | 135 g |
| 2 cups | 180 g |
| 3 cups | 270 g |
| 4 cups | 360 g |
| Tablespoons | Grams |
|---|---|
| 1 tsp | 1.9 g |
| 1 tbsp | 5.6 g |
| 2 tbsp | 11.2 g |
| 3 tbsp | 16.8 g |
| 4 tbsp | 22.4 g |
| 6 tbsp | 33.6 g |
| 8 tbsp | 44.8 g |
| 12 tbsp | 67.2 g |
| 16 tbsp | 89.6 g |
Grams to Cups — Rolled Oats (Old-Fashioned)
Have a recipe in grams and need cups? Use this reverse table.
| Grams | Cups | Tablespoons |
|---|---|---|
| 25 g | 0.278 cups | 4.46 tbsp |
| 50 g | 0.556 cups | 8.93 tbsp |
| 75 g | 0.833 cups | 13.4 tbsp |
| 100 g | 1.11 cups | 17.9 tbsp |
| 150 g | 1.67 cups | 26.8 tbsp |
| 200 g | 2.22 cups | 35.7 tbsp |
| 250 g | 2.78 cups | 44.6 tbsp |
| 300 g | 3.33 cups | 53.6 tbsp |
| 500 g | 5.56 cups | 89.3 tbsp |
| 1000 g | 11.1 cups | 178.6 tbsp |
Why does rolled oats (old-fashioned) weigh what it weighs?
Whole grains and uncooked rice are remarkably consistent by volume, but they can vary 10-20% by weight depending on variety, age, and moisture content. Long-grain rice is less dense than short-grain; basmati weighs less per cup than arborio. Weighing matters most when scaling for batch cooking or precise hydration ratios.
For rolled oats (old-fashioned) specifically, 1 cup weighs 90g. That is the figure to plug into recipes calling for cup measurements when you want gram precision. ChefVault stores this density (and 118 others) so you never have to look it up twice.
Recipes that originated outside the United States almost always specify weight in grams. Translating these to US cup measurements introduces error in every step. The ChefVault app handles the math automatically — paste a recipe, hit convert, get a clean weight-based version.
Frequently Asked Questions
How many grams are in 1 cup of rolled oats (old-fashioned)?
1 cup of rolled oats (old-fashioned) weighs approximately 90 grams.
How many grams in 1 tablespoon of rolled oats (old-fashioned)?
1 tablespoon of rolled oats (old-fashioned) weighs approximately 5.6 grams.
How many grams in 1 teaspoon of rolled oats (old-fashioned)?
1 teaspoon of rolled oats (old-fashioned) weighs approximately 1.9 grams.
How many grams are in 1/2 cup of rolled oats (old-fashioned)?
1/2 cup of rolled oats (old-fashioned) weighs about 45 grams.
How many grams are in 1/4 cup of rolled oats (old-fashioned)?
1/4 cup of rolled oats (old-fashioned) weighs about 22.5 grams.
How many tablespoons of rolled oats (old-fashioned) are in 100 grams?
100 grams of rolled oats (old-fashioned) is about 17.9 tablespoons.
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