Rolled Oats (Old Fashioned) Volume Reviewed September 19, 2026

1/2 Cups of Rolled Oats to Grams

Convert 1/2 Cups of Rolled Oats (Old Fashioned) to grams (40g in US cups). Complete volume-to-weight chart and tablespoon breakdown.

Direct Answer:

1/2 Cups of Rolled Oats (Old Fashioned) = 40 grams (1.41 oz)

 Tablespoons: 8.0 tbsp Teaspoons: 24.0 tsp Volume: 118.3 mL Condition: Gently scooped and leveled (not packed) 1 Cup Standard: 80g 

Volume-to-Weight Calculation Formula

Weight (grams) = Cup Volume × Grams per Cup (Density) Weight = 0.5 × 80g = 40 grams

Calibrated for Gently scooped and leveled (not packed) at room temperature (bulk density: 0.338 g/mL). Source: USDA FoodData Central (FDC ID 169705).

Technique Note: Loose flakes leave significant air voids; 1 cup weighs exactly 80g.

1/2 Cups of Rolled Oats Across International Cup Standards

Gram weight comparison across US Customary, US Legal, Metric, UK Imperial, and Japanese cup definitions.

Ingredient	Weight	Cups (US Standard)	Tablespoons	Teaspoons
US Customary Cup (236.588 mL)	40g	1/2 Cups (0.5 cups)	8.0 tbsp	24.0 tsp
US Legal Cup (Nutrition) (240 mL)	41g	1/2 Cups (0.5 cups)	8.0 tbsp	24.0 tsp
Metric Cup (250 mL)	42g	1/2 Cups (0.5 cups)	8.0 tbsp	24.0 tsp
UK Imperial Cup (284.131 mL)	48g	1/2 Cups (0.5 cups)	8.0 tbsp	24.0 tsp
Japanese Cup (200 mL)	34g	1/2 Cups (0.5 cups)	8.0 tbsp	24.0 tsp

Kitchen Measurement Converter

Live Calculation

Convert weight to volume accurately by accounting for density differences.

Select Ingredient 80g / cup

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Amount in Grams

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Cup Standard United States

Traditional US recipe cup defined as exactly 8 fluid ounces. Cup standards differ by region (US 236.6 mL, US Legal 240 mL, Metric 250 mL, UK 284.1 mL, Japanese 200 mL). US Customary is standard for American recipes.

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Custom Grams per Cup from your package label Leave blank to use the standard USDA density.

Calculated Result US Customary Cup (236.588 mL)

1/2 cups (0.50)

Weight equivalent: 40.0g (1.41 oz)

0.5 grams of Rolled Oats (Old Fashioned) equals approximately 1/2 cups (US Customary Cup).

8.0 Tablespoons

24.0 Teaspoons

118.3 mL Volume (mL)

1.41 oz Ounces (Weight)

How to Measure 1/2 Cups of Rolled Oats (Old Fashioned)

Whole oat groats steamed and flattened with steel rollers, preserving the germ, bran, and endosperm.

Chef's Tip:

In oatmeal cookies and fruit crisps, rolled oats provide chew and texture; do not substitute instant oats without expecting a denser crumb.

Other Rolled Oats Cup Sizes

2 cups Rolled Oats → 3 cups Rolled Oats →

Kitchen Tools

Companion Tools for Rolled Oats

Scale this recipe or convert companion units for this baking session:

Recipe Scaler & Multiplier Multiply or divide recipe quantities for Rolled Oats with automated fraction scaling → Cups to Tablespoons Converter Convert 1/2 Cups into level tablespoons and fluid ounces → Rolled Oats (Old Fashioned) Conversion Hub Complete weight-to-volume tables, bulk density data, and kitchen measuring guidelines → All Amounts Directory Browse all 68 calibrated weight benchmarks and 11 cup sizes →

Scientific Foundation

How We Calculate 1/2 Cups of Rolled Oats (Old Fashioned)

Weight calculations for Rolled Oats (Old Fashioned) are derived from bulk density standards verified by USDA FoodData Central and culinary laboratory benchmarks. In the standard US Customary cup (236.588 mL), 1/2 Cups weighs approximately 40 grams under standard condition (Gently scooped and leveled (not packed)).

Read Our Complete Conversion Methodology →

Frequently Asked Questions

How many grams is 1/2 Cups of Rolled Oats (Old Fashioned)?

1/2 Cups of Rolled Oats (Old Fashioned) weighs approximately 40 grams (1.41 ounces) when measured under standard conditions (Gently scooped and leveled (not packed)).

How many tablespoons is in 1/2 Cups of Rolled Oats (Old Fashioned)?

There are 16 tablespoons in 1 cup, so 1/2 Cups equals 8.0 tablespoons (24.0 teaspoons).

How is the weight of 1/2 Cups of Rolled Oats (Old Fashioned) calculated?

Weight is calculated by multiplying volume by bulk density: 0.5 cup(s) × 80 grams per cup = 40 grams.