Oats in Grams: How Many Grams in a Cup of Oats?
Convert oats from cups to grams and ounces with precision for any recipe.
1 cup of oats weighs 81.08 grams.
≈ 2.9 oz (weight)
Interactive Converter
1 cup of Oats weighs 81.1 grams.
81.08g (2.9 oz)
Level, unpacked US cupOats
US & UK alternative namesSpoon into cup & level off with a knife.
Prevent packing errorsOats cups to grams
Complete conversion reference chart for standard US cup measurements to grams and ounces.
| Cups (US) | Grams (g) | Ounces (oz) |
|---|---|---|
| 1/8 cup | 10g | 0.35 oz |
| 1/4 cup | 20.3g | 0.7 oz |
| 1/3 cup | 26.8g | 0.9 oz |
| 1/2 cup | 40.5g | 1.4 oz |
| 2/3 cup | 54.3g | 1.9 oz |
| 3/4 cup | 60.8g | 2.1 oz |
| 1 cup | 81.1g | 2.9 oz |
| 1 1/2 cups | 121.6g | 4.3 oz |
| 2 cups | 162.2g | 5.7 oz |
| 3 cups | 243.24g | 8.58 oz |
| 4 cups | 324.32g | 11.44 oz |
| 5 cups | 405.41g | 14.3 oz |
| Weight (Grams) | Cups (US) | Ounces (oz) | Tablespoons (tbsp) |
|---|---|---|---|
| 25g | ≈ 1/4 cup (0.31) | 0.88 oz | 4.93 tbsp |
| 50g | ≈ 1/2 cup (0.62) | 1.76 oz | 9.87 tbsp |
| 75g | ≈ 1 cup (0.93) | 2.65 oz | 14.8 tbsp |
| 100g | ≈ 1 1/4 cups (1.23) | 3.53 oz | 19.73 tbsp |
| 125g | ≈ 1 1/2 cups (1.54) | 4.41 oz | 24.67 tbsp |
| 150g | ≈ 1 3/4 cups (1.85) | 5.29 oz | 29.6 tbsp |
| 200g | ≈ 2 1/2 cups (2.47) | 7.05 oz | 39.47 tbsp |
| 250g | ≈ 3 cups (3.08) | 8.82 oz | 49.33 tbsp |
| 300g | ≈ 3 3/4 cups (3.70) | 10.58 oz | 59.2 tbsp |
| 350g | ≈ 4 1/4 cups (4.32) | 12.35 oz | 69.07 tbsp |
| 400g | ≈ 5 cups (4.93) | 14.11 oz | 78.93 tbsp |
| 500g | ≈ 6 1/4 cups (6.17) | 17.64 oz | 98.67 tbsp |
1 cup of rolled oats weighs 81 grams. Oats are very light — the way you fill the cup makes a significant difference. Spoon them in loosely and level off the top; don't scoop directly from the bag, which compresses the oats and can add 20–30% more than intended. These values are for rolled (old-fashioned) oats; quick oats pack slightly more densely.
For the most accurate results, weigh your oats with a digital kitchen scale — the values below assume a level, unpacked cup.
Oats ounces to grams
| Ounces | Grams | Cups |
|---|---|---|
| 1 oz | 28.4g | 0.35 cups |
| 2 oz | 56.7g | 0.7 cups |
| 3 oz | 85.1g | 1.05 cups |
| 4 oz | 113.4g | 1.4 cups |
| 6 oz | 170.1g | 2.1 cups |
| 8 oz | 226.8g | 2.8 cups |
| 10 oz | 283.5g | 3.5 cups |
| 12 oz | 340.2g | 4.2 cups |
| 16 oz | 453.6g | 5.59 cups |
Frequently asked questions
How many grams in 1 cup of oats?
1 cup of oats weighs 81.08g.
How many grams is 1/2 cup of oats?
1/2 cup of oats weighs 40.54g.
How many grams is 1/4 cup of oats?
1/4 cup of oats weighs 20.27g.
How many grams is 1/3 cup of oats?
1/3 cup of oats weighs 26.76g.
How many grams is 3/4 cup of oats?
3/4 cup of oats weighs 60.8g.
How many grams is 2 cups of oats?
2 cups of oats weighs 162.16g.
How many ounces in a cup of oats?
1 cup of rolled oats weighs approximately 2.9 ounces (81g).
How many cups is 100g of oats?
100g of oats is approximately 1.23 cups.
Practical baking & cooking tips for oats
- Rolled oats (90g/cup) and steel-cut oats (160g/cup) have completely different densities and liquid absorption rates; do not substitute volume 1:1.
- Toast dry oats in a dry frying pan for 3–5 minutes until nutty before using in crumbles or granola.
- Pulse rolled oats in a food processor for 30 seconds to make oat flour (90g per cup).
Common substitutions for oats
| Substitute | Ratio | Kitchen Notes |
|---|---|---|
| Quick oats | 1:1 by weight (90g) | Absorbs liquid faster; yields softer, less chewy baked goods |
| Quinoa flakes | 1:1 by weight | Gluten-free, high-protein alternative for porridge and baking |
Why accuracy matters for oats
Flaked oats trap air between rolled grains. A loosely scooped cup can be as light as 75g, while settled oats can reach 95g. In cookies, bread, and flapjacks, correct oat weight ensures proper chewiness without drying out the batter.
Who needs grams for oats?
Granola makers, breakfast meal preppers, and oatmeal cookie enthusiasts.
Common mistakes to avoid with oats
- Using instant oats instead of rolled oats in baking, resulting in a mushy texture.
- Measuring oats by packing them into the cup, which adds significantly more than intended — spoon them in loosely instead.
- Substituting whole rolled oats for quick oats in recipes without adjusting cooking time, leaving them undercooked.
Oats in other kitchen units
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