120 Grams of Rolled Oats in Cups
120 grams of rolled oats doesn't land on a clean fraction, so the result below is calculated exactly rather than rounded to a common measure. Based on a density of 90g per cup, it equals 1.33 cups.
- Cups (US Customary)
- 1.33 (1⅓)
- Tablespoons
- 21.3
- Teaspoons
- 64.0
- Milliliters
- 315 ml
120 grams of rolled oats = 1.33 cups (1⅓ cup / 21.3 tbsp / 64.0 tsp)
Rolled Oats has a density of approximately 90g per cup. Old-fashioned rolled oats. Quick oats run closer to 95g. Source: USDA FoodData Central. This is the figure used everywhere on this page, including the tablespoon and teaspoon values, so the numbers stay consistent whether you're reading the summary line, the table, or the FAQ answers below.
| Grams | Cups | Fraction | Tablespoons | Teaspoons |
|---|---|---|---|---|
| 100g | 1.11 | 1⅛ | 17.8 | 53.3 |
| 110g | 1.22 | 1¼ | 19.6 | 58.7 |
| 120g | 1.33 | 1⅓ | 21.3 | 64.0 |
| 125g | 1.39 | 1⅜ | 22.2 | 66.7 |
| 130g | 1.44 | 1½ | 23.1 | 69.3 |
How 120g Converts, Step by Step
120g divided by 90g (the weight of one cup of rolled oats) equals 1.33 cups. Multiplying that by 16 gives 21.3 tablespoons, and by 48 gives 64.0 teaspoons, since one cup always equals 16 tablespoons or 48 teaspoons regardless of the ingredient.
Rolled Oats is lighter than water, which weighs about 236g per cup. That's why 120g of rolled oats takes up more volume (315ml) than the same weight of water would (120ml). For a side-by-side look at how other ingredients compare, see the 120 grams to cups page.
If You're Using a Metric or Imperial Cup
The 1.33 cup figure above uses the US Customary cup (236.588ml). Recipes written outside the US sometimes use a metric cup (250ml) or an imperial (uk) cup (284.131ml) instead. At 120g, that's 1¼ metric cups or 1⅛ imperial cups of rolled oats, close to the US figure but not identical. The cup standard switch in the converter above recalculates this instantly for any gram amount.
Scaling This 120g Amount
Doubling a recipe that calls for 120g of rolled oats means weighing 240g, or measuring 2.67 cups if you're working by volume instead of weight. Halving it means 60g, or 0.67 cups. Weight scales exactly with simple multiplication; cup measurements compound any scooping error each time they're doubled or halved, so weighing is more reliable the more a recipe is scaled.
Rolled Oats Next to Other Dry Goods
Within dry goods, density still varies by ingredient. At 120g, cocoa powder (85g per cup) measures 1⅜ cup, while protein powder (120g per cup) measures 1 cup, compared to 1⅓ cup for rolled oats. Swapping ingredients in a recipe by cup measurement alone, without adjusting for this difference, changes the actual weight used.
Where This Amount Shows Up in Recipes
- Overnight oats for one serving typically use 40g to 50g.
- Oatmeal cookies often call for 90g to 150g per batch.
- Granola recipes usually need 250g to 300g as the base.
Measuring This Precisely
Dry Goods
Spoon into the cup and level off. Ingredients like cocoa powder benefit from a quick sift first to break up clumps.
For exact results
Baking soda and baking powder should always be measured with a dry measuring spoon, leveled flat — a heaping spoonful of either can meaningfully change how a baked good rises.
For every gram amount at once, the rolled oats conversion chart lists rolled oats across the full range from 1g to 1000g in one table.
Frequently Asked Questions
What is 120 grams of rolled oats in cups exactly?+
120 grams of rolled oats equals 1.33 cups, based on a density of 90g per cup.
Why doesn't 120g of rolled oats match a simple fraction?+
120g isn't a multiple of rolled oats's per-cup weight, so the cup value lands between common fractions. The closest practical measure is 1⅓ cup.
What's the most reliable way to measure 120g of rolled oats?+
A kitchen scale set to grams gives an exact 120g reading. Cups only approximate this amount, since 1⅓ cup rounds to the nearest practical fraction.
Is 120g likely a typo for a rounder amount?+
Possibly, if a recipe seems to expect a cleaner number. Check the nearby amounts table below for the closest common gram values for rolled oats.