Rolled Oats
Metric Cup to Gram
US Cup (236ml)
80.4g
Metric Cup (250ml)
85.0g
A US cup (236.59ml) of rolled oats weighs 80g, while a metric cup (250ml) weighs 85g. That's a 5.7% difference - make sure you know which cup size your recipe uses!
Rolled Oats — Quick Reference
Common metric cup to gram conversions
| Metric Cup | Gram |
|---|---|
| ¼ cup | 21g |
| ⅓ cup | 28g |
| ½ cup | 43g |
| ⅔ cup | 57g |
| ¾ cup | 64g |
| 1 cup | 85g |
| 1½ cups | 128g |
| 2 cups | 170g |
Based on rolled oats density of 0.34 g/ml (spooned method). Source: USDA FoodData Central.
Understanding Rolled Oats Conversions
The Math Behind This Conversion
To convert 1 metric cup of rolled oats to gram, we use the density of rolled oats (0.34 g/ml). A metric cup contains 250ml, so 1 metric cup equals 250ml. Multiplying by the density: 250ml × 0.34 g/ml = 85g.
US vs Metric Cups: Why It Matters
When converting rolled oats, the cup size matters significantly. A US cup (236.6ml) of rolled oats weighs 80g, while a metric cup (250ml) weighs 85g—a difference of 5g (6%). If you're following a recipe from a different country, using the wrong cup size could affect your results. American recipes use US cups, while recipes from Australia, UK, and most other countries use metric cups.
Measurement Tip
For consistent results with rolled oats, use a scale whenever possible. Volume measurements of grains can vary significantly based on how tightly packed they are. The density of 0.34 g/ml we use is based on a standard pour into a measuring cup.
About Our Data
The density value of 0.34 g/ml for rolled oats is from the USDA FoodData Central database (ID: 173904). This measurement was taken with rolled oats spooned into the measuring cup and leveled. Different measurement methods affect the density: packed (0.42 g/ml).