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1 cup of rolled oats (old-fashioned) = 89 grams (about 5.6 g per tablespoon). That is the King Arthur Baking — Ingredient Weight Chart weight — the standard US baking reference. Enter cups below for grams, or use the grams-to-cups table further down the page to go the other way.
Cups to Grams — Rolled Oats (old-fashioned)
Cooking Converter · weights from the King Arthur Baking ingredient chart (approximate — see the note below the converter)
1 cups of rolled oats (old-fashioned) = 89 g
1 cups × 89 g per cup = 89 g
The chart value is for generic old-fashioned or quick-cooking oats. Flakes vary by brand and how settled they are in the cup, so treat this one as a closer-than-usual approximation. Every row below is the same calculation — cups × 89 g per cup — so the table and the converter can never disagree.
| Cups | Grams |
|---|---|
| ¼ cup | 22 g |
| ⅓ cup | 30 g |
| ½ cup | 45 g |
| ⅔ cup | 59 g |
| ¾ cup | 67 g |
| 1 cup | 89 g |
| 1½ cups | 134 g |
| 2 cups | 178 g |
| 3 cups | 267 g |
| 4 cups | 356 g |
Going the other way — a metric recipe weighed out, an American one to fill — divide grams by 89 g per cup:
| Grams | Cups |
|---|---|
| 50 g | 0.56 cups |
| 100 g | 1.12 cups |
| 125 g | 1.4 cups |
| 150 g | 1.69 cups |
| 200 g | 2.25 cups |
| 250 g | 2.81 cups |
| 300 g | 3.37 cups |
| 400 g | 4.49 cups |
| 500 g | 5.62 cups |
Cup weights come from the King Arthur Baking — Ingredient Weight Chart, the standard reference US bakers use. A cup is a volume, so the weight you actually get depends on how you fill it — scooping flour straight from the bag packs in more than spooning it in and levelling it off, and sifted flour weighs less still. Treat these figures as the chart standard, and weigh with a scale when a recipe is fussy.
If your recipe stays in volumes, these converters handle the metric side — a US cup is about 237 ml, a tablespoon about 15 ml:
1 cup of rolled oats (old-fashioned) weighs 89 grams on the King Arthur Baking Ingredient Weight Chart. Cup weights are approximate — how you fill the cup (scooped, spooned, sifted, packed) moves the real weight, which is why weighing is more reliable than measuring by volume.
½ cup of rolled oats (old-fashioned) weighs 45 grams — exactly half the 89 g chart weight for a full cup.
250 grams of rolled oats (old-fashioned) is about 2.81 cups (250 g ÷ 89 g per cup). Use the converter above for any other amount.
Because a cup measures volume, not weight, every chart has to assume a filling method. The chart value is for generic old-fashioned or quick-cooking oats. Flakes vary by brand and how settled they are in the cup, so treat this one as a closer-than-usual approximation. This page uses the King Arthur Baking chart throughout, so its tables and converter always agree with each other.
Need the opposite direction? Use the gram to cup Converter to convert gram back to cup.
Browse every tool in this category on the Cooking Converter hub page.