Grains & legumes
Rolled oats: ounce to gram
1 ounce of Rolled oats = 28 gram — based on a density of 0.38 g/ml.
| ounce | gram |
|---|---|
| 0.5 | 14 |
| 1 | 28 |
| 2 | 57 |
| 3 | 85 |
| 4 | 113 |
| 6 | 170 |
| 8 | 227 |
| 12 | 340 |
| 16 | 454 |
Why the ingredient matters
A cup is a volume, not a weight. Rolled oats has a density of 0.38 g/ml — different ingredients give different weights for the same cup. That's why generic « cup to gram » charts are wrong by 10–30 %.
How precise is this?
The density used here is sourced and cross-checked. Real-world measures still vary by about ±10% depending on how the cup is filled — sifted, scooped or packed.
Oats are listed among gluten cereals in Annex II.
Data sources
- USDA FoodData Central — Public domain (US government work)
- King Arthur Baking — Ingredient Weight Chart — Reference chart (published factual values)
- ANSES Ciqual — table de composition — Licence Ouverte / Open Licence (Etalab)
Frequently asked questions
How many gram is 1 ounce of Rolled oats?
1 ounce of Rolled oats equals about 28 gram, using a density of 0.38 g/ml.
Is a US cup the same as a metric cup?
No — a US cup is 236.6 ml, a metric cup 250 ml, an imperial cup 284 ml. This page uses the US cup; the converter lets you switch conventions.
Why do different sites give different answers?
Most charts use one generic density for every ingredient. We use the measured density of Rolled oats itself — that is the physically correct conversion.
Should I weigh ingredients instead of using cups?
Yes, whenever possible — a scale removes fill-density error entirely, especially for flour and powders.