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120g Old-Fashioned Rolled Oats = 1 ⅓ cups

120 grams of old-fashioned rolled oats equals 1 ⅓ cups (1.33 US Customary cups, 1.26 Metric 250 mL cups, 315.5 mL, 21.33 tablespoons, or 4.23 oz) when measured dip and sweep at a verified density of 90g per US Customary cup.

Exact decimal volume: 1.33 US Customary Cups • 1.26 Metric Cups (250 mL) • 21.33 tbsp • 4.23 oz

Batch
Measuring density
Standard: Dip and sweep90g / cup
Converted Measure
120 g Old-Fashioned Rolled Oats (Dip and sweep) =
1 ⅓ US Cups
Physical scoop breakdown1.33 cups
1 cup
1/3 cup
Edit either side to reverseRolled Oats chart →
Grams
120 g
Ounces
4.23 oz
US Cups
1 ⅓ cups
Metric (250mL)
1.26 c
Tablespoons
21.33 tbsp
Milliliters
315.5 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 120g Old-Fashioned Rolled Oats

Batch scaling conversion table around 120g 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×) 60g (2.12 oz) ⅔ cup 157.7 mL
Standard (1×) 120g (4.23 oz) 1 ⅓ cups 315.5 mL
1.5× Batch 180g (6.35 oz) 2 cups 473.2 mL
Double Batch (2×) 240g (8.47 oz) 2 ⅔ cups 630.9 mL
Triple Batch (3×) 360g (12.7 oz) 4 cups 946.4 mL

Measuring 120g of Old-Fashioned Rolled Oats in the Kitchen

Because 1 US Customary Cup (236.6 mL) of old-fashioned rolled oats weighs 90g when measured dip and sweep, 120 Grams (120g) translates to 1.33 US cups (1 ⅓ cups).

Without a kitchen scale, measure 1 ⅓ cups (21.33 tablespoons total) using dip and sweep technique. 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 cups is 120 grams of old-fashioned rolled oats? ▾

120 grams of old-fashioned rolled oats (Dip and sweep, 90g per US cup) equals 1 ⅓ cups (1.33 US Customary Cups, 1.26 Metric 250 mL cups, or 21.33 tablespoons).

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.