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½ US Cup Old-Fashioned Rolled Oats = 45g

½ US Cup of old-fashioned rolled oats weighs 45 grams (1.59 ounces or 0.1 pounds; 118.3 mL or 8 tablespoons in volume) when measured dip and sweep at a verified bulk density of 90g per 236.6 mL US Customary cup.

Imperial weight: 1.59 oz (0.1 lb) • Volume: 118.3 mL (8 tbsp)

Batch
Measuring density
Standard: Dip and sweep90g / cup
Converted Measure
0.5 US cup Old-Fashioned Rolled Oats (Dip and sweep) =
45 g
Physical scoop breakdown0.50 cups
1/2 cup
Edit either side to reverseRolled Oats chart →
Grams
45 g
Ounces
1.59 oz
US Cups
½ cup
Metric (250mL)
0.47 c
Tablespoons
8 tbsp
Milliliters
118.3 mL

Kitchen note: 1 US Customary Cup (236.6 mL) of old-fashioned rolled oats (dip and sweep) weighs 90g, while 1 International Metric Cup (250 mL) weighs 95g.

Batch Scaling Around ½ US Cup Old-Fashioned Rolled Oats

Batch scaling conversion table around ½ US Cup of Old-Fashioned Rolled Oats (0.5× to 3× recipe batches in grams, ounces, US cups, and milliliters)
Batch Scale Weight (g / oz) US Cups & Spoons Metric (mL)
Half Batch (0.5×) 22.5g (0.79 oz) ¼ cup 59.1 mL
Standard (1×) 45g (1.59 oz) ½ cup 118.3 mL
1.5× Batch 67.5g (2.38 oz) ¾ cup 177.4 mL
Double Batch (2×) 90g (3.17 oz) 1 cup 236.6 mL
Triple Batch (3×) 135g (4.76 oz) 1 ½ cups 354.9 mL

Measuring ½ US Cup of Old-Fashioned Rolled Oats in the Kitchen

Measured dip and sweep at a verified bulk density of 90g per US cup, ½ US cup of old-fashioned rolled oats weighs 45 grams (1.59 ounces).

Spoon rolled oats gently into a dry measuring cup until heaping, then sweep level with a straight edge. Shaking or tapping the cup settles the broad, flat oat flakes into trapped gaps, increasing cup weight to nearly 100 grams.

Source note: USDA FoodData Central FDC ID 173904; King Arthur Baking Ingredient Weight Chart

Frequently Asked Questions

How many grams is ½ cup of old-fashioned rolled oats? ▾

½ US Cup of old-fashioned rolled oats measured Dip and sweep weighs 45 grams (1.59 ounces).

Can I substitute quick oats for rolled oats by weight? ▾

Yes, 90 grams of quick oats can replace 90 grams of rolled oats in most baking recipes, producing a slightly denser and more uniform crumb.

Why does a cup of rolled oats weigh so little? ▾

Whole oat groats that have been steamed and flattened into wide flakes create large, irregular air pockets inside a volume measuring cup.