Rolled Oats Grams to Cups Converter
Convert rolled oats from grams to cups using ingredient-specific baking measurements.
100 grams of rolled oats ≈ 1.12 US cups
About 1 ⅛ cups
Based on 1 US cup of rolled oats = 89g
Convert grams to cups
Enter an amount greater than 0.
100 grams of rolled oats equals
1.12 US cups
1 ⅛ cups
- Tablespoons 17.98 tbsp
- Teaspoons 54 tsp
- Milliliters 269.7 ml
Based on 1 US cup of rolled oats = 89g
Customize grams per cup
Enter a number of grams greater than 0.
Conversions are approximate and may vary by ingredient brand, packing, humidity, and measuring method. Spoons: 15 ml tablespoon, 5 ml teaspoon. Kitchen estimates have up to 10% volume rounding error; very small amounts use a threshold. See Methodology for the policy.
How this conversion is calculated
Adopted reference value
1 US cup of Rolled oats = 89g
Data last verified: 2026-07-18
Cup type
US cup / 240 ml
Measuring method
As-packaged, not compacted · lightly filled
Rolled oats grams to cups conversion table
| Grams | Cups | tbspTablespoons | tspTeaspoons | ml |
|---|---|---|---|---|
| 50g | 0.56 cups | 8.99 | 27 | 134.8 |
| 100g | 1.12 cups | 17.98 | 54 | 269.7 |
| 125g | 1.40 cups | 22.47 | 67 | 337.1 |
| 150g | 1.69 cups | 26.97 | 81 | 404.5 |
| 200g | 2.25 cups | 35.96 | 108 | 539.3 |
| 250g | 2.81 cups | 44.94 | 135 | 674.2 |
| 300g | 3.37 cups | 53.93 | 162 | 809 |
| 500g | 5.62 cups | 89.89 | 270 | 1348.3 |
Kitchen fraction approximation
¼ cup
≈ 22g
⅓ cup
≈ 30g
½ cup
≈ 45g
⅔ cup
≈ 59g
¾ cup
≈ 67g
Sources & how they compare
| Source | Reported value | Comparable source-cup value | Type | Method the source states | Adopted here | Checked |
|---|---|---|---|---|---|---|
| King Arthur Baking — Ingredient Weight Chart | 89 g per 1 cup (volume not stated) | 89g | Direct | old-fashioned or quick-cooking, as the chart states; method not stated | Adopted | 2026-07-18 |
| The Quaker Oats Company — Old Fashioned Oats (via USDA FoodData Central) | 40 g per ½ cup (volume not stated) | 80g | Derived | not stated (the label gives a serving size only) | 2026-10-26 |
Measuring step this site recommends: lightly filled.
When sources disagree, follow your recipe: use its gram weights if it gives them, or measure the way its author did. The adopted value is one stated convention, not a correction of the other sources.
A comparable source-cup value only scales a half-cup or tablespoon serving to one source cup. When a source does not state the cup's exact volume, we do not present it as a fixed-milliliter normalization.
Measurement notes
- Rolled oats are bulky and full of air pockets, so scoop lightly rather than pressing them down.
- Old-fashioned rolled oats and quick oats differ in size, which can shift the weight per cup by several grams.
- Because oats settle during shipping and storage, gently shaking the container before measuring can change the result — measure loosely for consistency.
Common mistakes
- Assuming 1 cup of rolled oats equals 240g like water — it is actually 89g per US cup.
- Using this dry weight for soaked or cooked oats, which have absorbed water.
Convert other ingredients in your recipe
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1 cup = 216g · 100g ≈ 0.46 cups
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Plain whole-milk yogurt
1 cup = 245g · 100g ≈ 0.41 cups
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Brown sugar (packed)
1 cup = 220g · 100g ≈ 0.45 cups
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Each link converts that ingredient with its own cup weight; none of them is a substitute for this one.
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Frequently asked questions
How many cups is 100 grams of rolled oats?
100 grams of rolled oats is about 1.12 cups, based on 1 US cup (240 ml) = 89g.
How many grams are in 1 cup of rolled oats?
1 US cup of rolled oats, as packaged, weighs about 89 grams when the cup is filled lightly without pressing them down.
Does 1 cup of rolled oats weigh the same in a metric cup?
No. A metric cup (250 ml) holds slightly more than a US cup (240 ml), so 1 metric cup of rolled oats is about 92.7g, compared with 89g in a US cup.
What's the best way to measure rolled oats accurately?
Fill the cup lightly with the oats, without pressing them down. Use a kitchen scale when your recipe calls for a precise weight.
Can I convert cups of rolled oats back to grams?
Yes, use the Cups to Grams tool with rolled oats selected to convert any cup amount back into grams.
Why does rolled oats convert differently from other ingredients?
Grams measure weight and cups measure volume, so the conversion depends on how dense rolled oats is. A denser or lighter ingredient weighs a different amount per cup.