How many grams are in 1 cup of Oats?
One US cup (240 ml) of rolled oats weighs about 89 grams. A US customary cup (236.6 ml) holds about 88 g, a metric cup (250 ml) about 93 g, and an imperial cup (284.1 ml) about 105 g.
Cups of Oats to grams
One US cup (240 ml) of rolled oats weighs about 89 grams (3.1 oz), measured scooped.
Rolled oats are large, irregular flakes, so a cup of them is mostly air: just 89 g. How the flakes happen to stack changes the weight more than technique does — expect ±10 g between brands and batches.
Ingredient
89 grams
US cup · rolled oats · scooped
More precise value: 89 grams
- Cup standard
- US cup · 240 ml
- Ingredient
- rolled oats
- Method
- scooped
- Density
- 0.371 g/ml
- Sources
- King Arthur · USDA FDC
- Reviewed
- 2026-08
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Oats by cup standard
The same volume weighs more in a larger cup. These figures scale the reference weight of 89 g per 240 ml US cup by each cup standard’s exact volume.
| Cups | US cup | US customary cup | Metric cup | Imperial cup |
|---|---|---|---|---|
| ⅛ | 11 g | 11 g | 12 g | 13 g |
| ¼ | 22 g | 22 g | 23 g | 26 g |
| ⅓ | 30 g | 29 g | 31 g | 35 g |
| ½ | 45 g | 44 g | 46 g | 53 g |
| ⅔ | 59 g | 58 g | 62 g | 70 g |
| ¾ | 67 g | 66 g | 70 g | 79 g |
| 1 | 89 g | 88 g | 93 g | 105 g |
| 1½ | 134 g | 132 g | 139 g | 158 g |
| 2 | 178 g | 175 g | 185 g | 211 g |
rolled oats, scooped. Reviewed 2026-08.
Tablespoons and teaspoons
Spoon measures use the US definitions: 1 tablespoon = 14.79 ml (16 per cup) and 1 teaspoon = 4.93 ml (3 per tablespoon).
| Measure | Grams (g) | Ounces (oz) |
|---|---|---|
| 1 tsp | 1.8 | 0.06 |
| 1 tbsp | 5.5 | 0.19 |
| 2 tbsp | 11 | 0.39 |
| 4 tbsp (¼ cup) | 21.9 | 0.77 |
| 8 tbsp (½ cup) | 43.9 | 1.55 |
| 16 tbsp (1 cup) | 87.7 | 3.09 |
How to measure Oats by volume
- Scoop and level without pressing down — oats should not be packed.
- Note the type: rolled (old-fashioned) oats, quick oats and steel-cut oats all weigh differently per cup.
- Our figure is for rolled oats; steel-cut are far denser.
Why the weight varies
Rolled-oat flakes vary in size and how they settle; expect ±10 g per cup between brands.
Oatmeal cookies and granola tolerate variation well, but porridge ratios and structure-critical bakes benefit from weighing. Never substitute steel-cut for rolled by volume — the cup weights differ by nearly double.
Which value we publish, and why
We publish 89 g per US cup of rolled oats (King Arthur); USDA lists 81 g for dry regular oats.
Values you may see elsewhere
Sources: King Arthur · USDA FDC . Reference weight verified against King Arthur, USDA FDC. Reviewed 2026-08. Conversions are estimates — ingredient weight varies with packing and brand.
Frequently asked questions
How many grams is 1 tablespoon of Oats?
One US tablespoon (14.79 ml) of rolled oats weighs about 5.5 g, and one teaspoon (4.93 ml) about 1.8 g.
How many ounces is 1 cup of Oats?
One US cup of rolled oats weighs about 3.1 oz (89 g). Note these are weight ounces — for liquids, don’t confuse them with fluid ounces, which measure volume.